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Drilling Techniques

2012-05-16T03:37:10Z

drill press alts

← Older revision		Revision as of 03:37, 16 May 2012
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	[[image:Spiral screwdriver 0906-5.jpg\|center\|400px]]		[[image:Spiral screwdriver 0906-5.jpg\|center\|400px]]

−	If you ~~ever need~~ to drill a ~~technique~~, ~~here~~'s ~~how~~.	+	How to drill a technique.
		+
		+
		+	==Methods==
		+	===Withdrawing Bits===
		+	In nearly all cases a drill bit is best rotated forwards while the drill is pulled out. Augers must be rotated backwards to remove them.
		+
		+	Never waggle the drill from side to side to aid bit removal. This greatly increases friction, making removal much harder. The bending results in many damaged and some ruined drill bits. Damaged bits put greatly increased forces on drill bearings, causing reduced tool life. Damaged bits are much more likely to break in use, sometimes causing hand injuries. Damaged bits also wander badly, drill less well and make misshapen holes.
		+
		+
		+	===No drill press===
		+	If you don't have a drill press to ensure correctly aligned holes, a simple jig can achieve alignment good enough for most jobs.
		+	# A hole is drilled in 2 pieces of sheet, aligning the drill as well as possible
		+	# The sheet pieces are fixed together like so:
		+
		+	________ ________
		+	\|________ ________\|
		+	\| \| \| \|
		+	\| \| \| \|
		+	\|___\|____ ____\|___\|
		+	\|________ ________\|
		+
		+
		+	[http://groups.google.co.uk/group/uk.d-i-y/browse_frm/thread/a760cd3a82d343bd?hl=en# Discussion of more methods] to get holes accurately vertical without a drill press
		+
		+	===Panel edge drilling===
		+	To get holes in panel edges centred see [[Edge drilling jig]]
		+
		+	===Pockets===
		+	[[image:Psj pocket hole joint.gif\|right\|185px]]
		+
		+	To drill pocket hole fixings, use a jig. Clamp the jig to the workpiece and drill.
		+
		+	A simple ad-hoc jig is easily made by drilling a piece of wood then cutting it to form a face at about 15 degrees.
		+
		+	More about [http://en.wikipedia.org/wiki/Pocket-hole_joinery pockets]
		+
		+	===No drill===
		+	[[image:2511-5 PB screw.jpg\|right\|185px]]
		+
		+	Ways to drill without a drill bit include:
		+	* Wood can be drilled with a screw. Rotate the screw anticlockwise to drill and apply pressure when possible (can't apply much when initially entering the wood).
		+	* Masonry can be drilled with a chisel. Just rotate the chisel a bit between each hammer blow. Its slow though.
		+	* Thin sheet metal can be drilled by nailing it. Then waggle the nail to loosen it and remove. Holes can be misshapen.
		+	* Wood & metal can also be drilled & screwed in one go by self drilling [[screws]]. Very thin sheet metal can be drilled with a plasterboard screw.
		+	* Some materials can be holed with a punch.
		+
		+
		+	===Chipping===
		+	Chipping of the top entry surface can be more or less eliminated by clamping a piece of wood over it, and drilling through both pieces.
		+
		+	Chipping of the bottom exit surface can be tackled the same way.
		+
		+	Some people just apply [[Tapes\|masking tape]] to reduce surface chipping. Reports on effectiveness are mixed.
		+
		+	Type of drill bit much affects top surface damage too. Augers are relatively clean cutting, flat bits are some of the worst.
		+
		+
		+	===Reamer===
		+	[[image:Reamer bit 4567-2.jpg\|right\|185px]]
		+
		+	If you need a hole in metal that's a precise size, and/or smooth sided, drill it about 0.2mm undersize, then finish it off with a reamer. The exact undersize to use varies from one reamer to another.
		+
		+	[http://en.wikipedia.org/wiki/Reamer Wikipedia]
		+
		+
		+	===Plug cutter===
		+	[[image:Plug cutters 2859-3.jpg\|right\|185px]]
		+
		+	Plug cutters remove a slug of wood that's then used to plug a hole, most often to cover a screw head. The result is barely visible.
		+	* You need a drill press to use a plug cutter
		+	* The size of plug cutter and size of drill bit used to make the original hole are different, not the same
		+	* Don't assume the interior size of the cutter is the plug size it cuts, if its less than perfectly centred it won't be.
		+	* Some plug cutters currently on the market just don't work.
		+	* Some need sharpening before use


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	===Melamine===		===Melamine===
	Melamine, aka Formica, suffers badly from surface chipping. See [[Drilling Techniques#Chipping]] to avoid this.		Melamine, aka Formica, suffers badly from surface chipping. See [[Drilling Techniques#Chipping]] to avoid this.
−
−
−	~~==Methods==~~
−	~~===Removing Bits===~~
−	~~In nearly all cases a drill bit is best rotated forwards while the drill is pulled out. Augers must be rotated backwards to remove them.~~
−
−	Never waggle the drill from side to side to aid bit removal. This greatly increases friction, making removal much harder. The bending results in many damaged and some ruined drill bits. Damaged bits put greatly increased forces on drill bearings, causing reduced tool life. Damaged bits are much more likely to break in use, sometimes causing hand injuries. Damaged bits also wander badly, drill less well and make misshapen holes.
−
−
−	~~===Drill press===~~
−	~~Force applied to the feed lever on a drill press is multiplied several times by the lever effect, so don't be tempted to give it a push to get the job done.~~
−
−	~~Beware of an insufficiently [[clamp]]ed workpiece, which can spin out under force and hit you.~~
−
−
−	~~===Vertical Drilling===~~
−	~~[http://groups.google.co.uk/group/uk.d-i-y/browse_frm/thread/a760cd3a82d343bd?hl=en# Discussion of methods] to get holes accurately vertical without a drill press~~
−
−	~~===Panel edge drilling===~~
−	~~To get holes in panel edges centred see [[Edge drilling jig]]~~
−
−	~~===Pockets===~~
−	~~[[image:Psj pocket hole joint.gif\|right\|300px]]~~
−
−	~~To drill pocket hole fixings, use a jig. A simple ad-hoc jig is easily made by drilling a piece of wood then cutting it to form a face at about 15 degrees. Clamp the jig to the workpiece and drill.~~
−
−	~~===No drill===~~
−	~~[[image:2511-5 PB screw.jpg\|right\|185px]]~~
−
−	~~Ways to drill without a drill bit include:~~
−	* Wood can be drilled with a screw. Rotate the screw anticlockwise to drill and apply pressure when possible (can't apply much when initially entering the wood).
−	* Masonry can be drilled with a chisel. Just rotate the chisel a bit between each hammer blow. Its slow though.
−	* Thin sheet metal can be drilled by nailing it. Then waggle the nail to loosen it and remove. Holes can be misshapen.
−	* Wood & metal can also be drilled & screwed in one go by self drilling [[screws]]. Very thin sheet metal can be drilled with a plasterboard screw.
−	* Some materials can be holed with a punch.
−
−
−	~~===Chipping===~~
−	~~Chipping of the top entry surface can be more or less eliminated by clamping a piece of wood over it, and drilling through both pieces.~~
−
−	~~Chipping of the bottom exit surface can be tackled the same way.~~
−
−	~~Some people just apply [[Tapes\|masking tape]] to reduce surface chipping. Reports on effectiveness are mixed.~~
−
−	~~Type of drill bit much affects top surface damage too. Augers are relatively clean cutting, flat bits are some of the worst.~~
−
−
−	~~===Reamer===~~
−	~~[[image:Reamer bit 4567-2.jpg\|right\|185px]]~~
−
−	~~If you need a hole in metal that's a precise size, and/or smooth sided, drill it about 0.2mm undersize, then finish it off with a reamer. The exact undersize to use varies from one reamer to another.~~
−
−	~~[http://en.wikipedia.org/wiki/Reamer Wikipedia]~~
−
−
−	~~===Plug cutter===~~
−	~~[[image:Plug cutters 2859-3.jpg\|right\|185px]]~~
−
−	~~Plug cutters remove a slug of wood that's then used to plug a hole, most often to cover a screw head. The result is barely visible.~~
−	* You need a drill press to use a plug cutter
−	* The size of plug cutter and size of drill bit used to make the original hole are different, not the same
−	* Some plug cutters currently on the market just don't work.
−	* Some need sharpening before use

File:Psj pocket hole joint.gif

2012-05-15T18:28:49Z

uploaded "[[File:Psj pocket hole joint.gif]]" Pocket hole joint being assembled Category:Public domain

Drilling Techniques

2012-05-15T18:27:46Z

Pockets: write

← Older revision		Revision as of 18:27, 15 May 2012
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	[http://groups.google.co.uk/group/uk.d-i-y/browse_frm/thread/a760cd3a82d343bd?hl=en# Discussion of methods] to get holes accurately vertical without a drill press		[http://groups.google.co.uk/group/uk.d-i-y/browse_frm/thread/a760cd3a82d343bd?hl=en# Discussion of methods] to get holes accurately vertical without a drill press

		+	===Panel edge drilling===
		+	To get holes in panel edges centred see [[Edge drilling jig]]
		+
		+	===Pockets===
		+	[[image:Psj pocket hole joint.gif\|right\|300px]]
		+
		+	To drill pocket hole fixings, use a jig. A simple ad-hoc jig is easily made by drilling a piece of wood then cutting it to form a face at about 15 degrees. Clamp the jig to the workpiece and drill.

	===No drill===		===No drill===

File:Drill tip spur2.jpg

2012-05-14T23:44:34Z

deleted "[[File:Drill tip spur2.jpg]]" replaced

Drilling Techniques

2012-05-14T23:42:13Z

Masonry & Stone: pic

← Older revision		Revision as of 23:42, 14 May 2012
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	==Workpiece materials==		==Workpiece materials==
	===Wood===		===Wood===
−	[[Image:~~Drill_tip_spur2~~.jpg\|right\|185px]]	+	[[Image:Drill_tip_spur-3.jpg\|right\|185px]]
	[[Image:Auger_0071-6.jpg\|right\|185px]]		[[Image:Auger_0071-6.jpg\|right\|185px]]

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	Chain drilling is also possible, but slow & messy. Simply drill a ring of small holes & chisel to finish.		Chain drilling is also possible, but slow & messy. Simply drill a ring of small holes & chisel to finish.
−

	===Mild Steel===		===Mild Steel===
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	===Masonry & Stone===		===Masonry & Stone===
−	[[Image:~~Drill_masonry2~~.jpg\|right\|185px]]	+	[[Image:Drill_masonry-4.jpg\|right\|185px]]
	[[Image:Masonry_bit_0073-3.jpg\|right\|185px]]		[[Image:Masonry_bit_0073-3.jpg\|right\|185px]]

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	Some core drills are designed for use in hammer mode, some aren't. They're mostly used without it.		Some core drills are designed for use in hammer mode, some aren't. They're mostly used without it.
−

	===Reinforced Concrete===		===Reinforced Concrete===

File:Drill tip spur-3.jpg

2012-05-14T21:41:42Z

uploaded "[[File:Drill tip spur-3.jpg]]" Lip & spur or dowel drill bit GNUFDL1.2, [http://en.wikipedia.org/wiki/File:Drill_tip_spur.jpg more info]

Drill bit

2012-05-14T21:40:15Z

Lip & Spur Wood Bits: pic

← Older revision		Revision as of 21:40, 14 May 2012
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	===SDS Lengths===		===SDS Lengths===
−	[[image:1m 10mm SDS drill bit 4638-3.jpg\|~~400px~~]]	+	[[image:1m 10mm SDS drill bit 4638-3.jpg\|650px]]

	SDS bits are widely available upto 1m lengths		SDS bits are widely available upto 1m lengths
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	==Lip & Spur Wood Bits==		==Lip & Spur Wood Bits==
−	[[Image:~~Drill_tip_spur2~~.jpg\|400px\|centre\|Lip & Spur bit]]	+	[[Image:Drill_tip_spur-3.jpg\|400px\|centre\|Lip & Spur bit]]

	Also known as dowel drills.		Also known as dowel drills.
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	Lip & Spur bits don't drill metal or most plastics.		Lip & Spur bits don't drill metal or most plastics.
−

	==Countersink==		==Countersink==

File:Gimlet-4.jpg

2012-05-14T20:07:56Z

← Older revision		Revision as of 20:07, 14 May 2012
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	Gimlet		Gimlet

−	[[Category:Public ~~Domain~~]]	+	[[Category:Public domain]]

File:Gimlet-4.jpg

2012-05-14T20:07:06Z

uploaded "[[File:Gimlet-4.jpg]]" Gimlet Category:Public Domain

Drill bit

2012-05-14T20:05:55Z

Gimlet: pic

← Older revision		Revision as of 20:05, 14 May 2012
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	[[image:Hex drill bit 2639-5.jpg\|400px]]		[[image:Hex drill bit 2639-5.jpg\|400px]]

−	Hexagonal shanked drill bits can be changed by nothing more than pulling one out and slotting another in. This is a real plus for some jobs. ~~However~~ the strength of the bit to shank bond is ~~often~~ weak, making them only ~~suited to~~ light work.	+	Hexagonal shanked drill bits can be changed by nothing more than pulling one out and slotting another in. This is a real plus for some jobs.
		+
		+	There are 2 types of hex shank bit:
		+	* 1 piece bits are expensive, but effective
		+	* 2 piece bits are cheap but the strength of the bit to shank bond is weak, making them only capable of light work

	When used in push-in hex holders the bits are generally not held firm, and can waggle a bit. A Jacob's chuck is used when more accuracy is needed.		When used in push-in hex holders the bits are generally not held firm, and can waggle a bit. A Jacob's chuck is used when more accuracy is needed.

	Hexagonal chucks that don't hold the bit firm soon result in the bit being left in the work when the drill's removed - a pain. Use a chuck that locks onto the bit.		Hexagonal chucks that don't hold the bit firm soon result in the bit being left in the work when the drill's removed - a pain. Use a chuck that locks onto the bit.
−

	==Core Drill==		==Core Drill==
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	These bits give much better performance in wood than universal twist drills, lip & spur bits, or any other of the commonly found wood bits. However I've yet to see anywhere selling them ready made, so unless anyone spots them for sale, these bits are [[Special:Allpages\|diy]] only.		These bits give much better performance in wood than universal twist drills, lip & spur bits, or any other of the commonly found wood bits. However I've yet to see anywhere selling them ready made, so unless anyone spots them for sale, these bits are [[Special:Allpages\|diy]] only.

−	These bits are not suitable for drilling metal or other hard subtances. ~~The bits are weaker than standard twist drills, and must never be pushed. This isn~~'~~t a problem as~~ they ~~drill quickly and easily, even where standard twist drills give up. I~~'~~ve seen a frustrated twist drill user try one of these and cut through the once difficult workpiece quickly and easily~~.	+	These bits are not suitable for drilling metal or other hard subtances. They're also not suitable for plastic or soft metals; they're for wood only.

−	Their disadvantage compared to standard twist drills is that they aren't abuse proof. If pushed ~~hard~~ during drilling they ~~can~~ break. If used ~~to drill steel~~ they ~~can chip or break~~.	+	The bits are weaker than standard twist drills, and must never be pushed. This isn't a problem as they drill quickly and easily with no pushing, even where standard twist drills give up. I've seen a frustrated twist drill user try one of these and cut through the once difficult workpiece like butter.
		+
		+	Their disadvantage compared to standard twist drills is that they aren't abuse proof. If pushed during drilling, or used on steel, they chip & break. If used on plastic they jam.

	These bits cost nothing, because they can be made just as well from worn, blunt, broken or badly ground twist drills as new bits.		These bits cost nothing, because they can be made just as well from worn, blunt, broken or badly ground twist drills as new bits.
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	* Sawing / filing bits with lousy performance		* Sawing / filing bits with lousy performance
	* Can be used to enlarge holes to odd shapes, but very slow		* Can be used to enlarge holes to odd shapes, but very slow
−	* ~~Some~~ of these bits have the cutting grooves in the wrong direction, and are pretty hopeless	+	* Many of these bits have the cutting grooves in the wrong direction, and are pretty hopeless
−		+

	==Spiral saw==		==Spiral saw==
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	==Gimlet==		==Gimlet==
−	[[Image:Gimlet.jpg\|240px\|centre\|Gimlet drill]]	+	[[Image:Gimlet-4.jpg\|240px\|centre\|Gimlet drill]]

	The gimlet drill bit has a full width tapered screw thread at the tip, followed by a fluted section somewhat like a twist drill. The screw thread screws into the workpiece forcing the wood apart, and the fluted section then cuts out the wood. The cutting is done by the side of the drill bit, not the end. A very old bit pattern occasionally found on hand drills. Restricted to small hole sizes, a quarter of an inch at most. Can split small pieces of wood.		The gimlet drill bit has a full width tapered screw thread at the tip, followed by a fluted section somewhat like a twist drill. The screw thread screws into the workpiece forcing the wood apart, and the fluted section then cuts out the wood. The cutting is done by the side of the drill bit, not the end. A very old bit pattern occasionally found on hand drills. Restricted to small hole sizes, a quarter of an inch at most. Can split small pieces of wood.
−

	==Manual Hammer Drill==		==Manual Hammer Drill==

File:Spade bits-5.jpg

2012-05-14T19:48:24Z

uploaded "[[File:Spade bits-5.jpg]]" pointed flat bit from wikipedia, gnufdl1.2

Drill bit

2012-05-14T19:47:25Z

Pointed flat bits: pic

← Older revision		Revision as of 19:47, 14 May 2012
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	==Pointed flat bits==		==Pointed flat bits==
−	[[Image:~~Spade_bits3~~.jpg\|400px\|centre\|Flat bit showing the tip shape to use when regrinding]]	+	[[Image:Spade_bits-5.jpg\|400px\|centre\|Flat bit showing the tip shape to use when regrinding]]

	Broken bits are quickly and easily ground to a pointed flat bit shape. No particular skill is needed. These don't cut as well as twist drills, but if your bit breaks during a job, these are much quicker than going to the shop for another bit.		Broken bits are quickly and easily ground to a pointed flat bit shape. No particular skill is needed. These don't cut as well as twist drills, but if your bit breaks during a job, these are much quicker than going to the shop for another bit.
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	At low speed these drill through plaster quickly enough, but have little drilling performance on buried water pipes.		At low speed these drill through plaster quickly enough, but have little drilling performance on buried water pipes.
−

	==3 for £1 long drill bits==		==3 for £1 long drill bits==

File:Drill tip 30mm hinge-3.jpg

2012-05-14T18:56:40Z

(cc)

← Older revision		Revision as of 18:56, 14 May 2012
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	Cupboard hinge bit		Cupboard hinge bit
		+
		+	[http://en.wikipedia.org/wiki/File:Drill_tip_30mm_hinge.jpg gnufdl1.2]

File:Drill tip 30mm hinge-3.jpg

2012-05-14T18:40:35Z

uploaded "[[File:Drill tip 30mm hinge-3.jpg]]" Cupboard hinge bit

Drill bit

2012-05-14T18:39:29Z

Hinge Sinkers: pic

← Older revision		Revision as of 18:39, 14 May 2012
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	==Hinge Sinkers==		==Hinge Sinkers==
−	[[Image:Drill_tip_30mm_hinge.jpg\|400px\|centre\|Hinge sinker]]	+	[[Image:Drill_tip_30mm_hinge-3.jpg\|400px\|centre\|Hinge sinker]]

	These drill wide shallow holes in chipboard for fitting recessed hinges. Used for kitchen unit fitting. Available in two sizes, 26mm & 35mm.		These drill wide shallow holes in chipboard for fitting recessed hinges. Used for kitchen unit fitting. Available in two sizes, 26mm & 35mm.

	Some hinge sinker bits have problems. Review [http://groups.google.co.uk/group/uk.d-i-y/browse_thread/thread/698c99871187d016/7bd0485c11e63b9c?hl=en#7bd0485c11e63b9c here].		Some hinge sinker bits have problems. Review [http://groups.google.co.uk/group/uk.d-i-y/browse_thread/thread/698c99871187d016/7bd0485c11e63b9c?hl=en#7bd0485c11e63b9c here].
−

	==Tile & Glass Bits==		==Tile & Glass Bits==

File:Forstner Bohrer-6.jpg

2012-05-14T17:08:12Z

uploaded "[[File:Forstner Bohrer-6.jpg]]" Forstner drill bit GNUFDL1.2, [http://en.wikipedia.org/wiki/File:Forstner_Bohrer_01.jpg see]

Drill bit

2012-05-14T17:05:57Z

Forstner Bits: pic

← Older revision		Revision as of 17:05, 14 May 2012
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	==Forstner Bits==		==Forstner Bits==
−	[[Image:~~Forstner_Bohrer_02~~.jpg\|200px]]	+	[[Image:Forstner_Bohrer-6.jpg\|200px]]

	These drill wide and mostly flat bottomed holes, with the exception of the small central point. They can work upto the edge of the wood, and will also drill overlapping holes. They require considerable pressure to engage in the wood, so are mostly used with a drill press.		These drill wide and mostly flat bottomed holes, with the exception of the small central point. They can work upto the edge of the wood, and will also drill overlapping holes. They require considerable pressure to engage in the wood, so are mostly used with a drill press.

File:Drill brace-3.jpg

2012-05-14T16:54:29Z

uploaded "[[File:Drill brace-3.jpg]]" GNUFDL1.2, see http://en.wikipedia.org/wiki/File:Drill_brace.jpg

Drill bit

2012-05-14T16:53:26Z

brace shank

← Older revision		Revision as of 16:53, 14 May 2012
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	Bits with a tapered shank just push in to the taper chuck. There's more than one pitch of taper, giving varying ease of removal after use. When the bit doesn't just pull out, a drift is knocked through a cross-hole in the chuck to remove the bit.		Bits with a tapered shank just push in to the taper chuck. There's more than one pitch of taper, giving varying ease of removal after use. When the bit doesn't just pull out, a drift is knocked through a cross-hole in the chuck to remove the bit.
		+
		+	==Brace==
		+	[[image:Drill_brace-3.jpg\|400px]]
		+
		+	These have a tapered square shank.

	==Flexible==		==Flexible==

File:Yankee countersink 4210-3.jpg

2012-05-14T16:40:21Z

uploaded "[[File:Yankee countersink 4210-3.jpg]]" I release this image into the public domain. Any trademarks, copyrighted material and any other intellectual property depicted in the image still belong to their respective owners. Category:Public domain

Drill bit

2012-05-14T16:36:08Z

Conical drill bit: pic

← Older revision		Revision as of 16:36, 14 May 2012
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	==Conical drill bit==		==Conical drill bit==
		+	[[image:Wolfcraft_drill_bit-4.jpg\|400px]]
		+
	Cone bits are fat cone shaped bits. They enable drilling of a wide range of hole sizes with one bit in soft sheet materials such as plastic and aluminium.		Cone bits are fat cone shaped bits. They enable drilling of a wide range of hole sizes with one bit in soft sheet materials such as plastic and aluminium.

	Applying the bit to both sides of the hole halves the inevitable variation of the hole width that the cone shape produces.		Applying the bit to both sides of the hole halves the inevitable variation of the hole width that the cone shape produces.
−

	==Step bit==		==Step bit==

File:Countersink 2638-6.jpg

2012-05-14T15:58:38Z

uploaded a new version of "[[File:Countersink 2638-6.jpg]]" I release this image into the public domain. Any trademarks, copyrighted material and any other intellectual property depicted in the image still belong to their respective owners. Category:Public domain

Drill bit

2012-05-14T15:55:50Z

Masonry Bits: m

← Older revision		Revision as of 15:55, 14 May 2012
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	==Masonry Bits==		==Masonry Bits==
−	[[image:Masonry bit 0073-3.~~JPG~~\|400px]]	+	[[image:Masonry bit 0073-3.jpg\|400px]]

	These are steel drills with a piece of Tungsten Carbide welded or brazed into the tip. These "'''TCT'''" (Tungsten Carbide Tipped) masonry bits are easily recognised as the tip is wider than the shank. The tip is fairly blunt and cuts by crushing a small area of the workpiece under the hammer action of the drilling machine. If used without [[Hammers\|hammer]] action the tip wears away quickly.		These are steel drills with a piece of Tungsten Carbide welded or brazed into the tip. These "'''TCT'''" (Tungsten Carbide Tipped) masonry bits are easily recognised as the tip is wider than the shank. The tip is fairly blunt and cuts by crushing a small area of the workpiece under the hammer action of the drilling machine. If used without [[Hammers\|hammer]] action the tip wears away quickly.
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	Masonry bits are available in quite long lengths, typically up to 30cm for non-SDS.		Masonry bits are available in quite long lengths, typically up to 30cm for non-SDS.
−

	==SDS==		==SDS==

File:1m 10mm SDS drill bit 4638-3.jpg

2012-05-14T15:52:45Z

uploaded "[[File:1m 10mm SDS drill bit 4638-3.jpg]]" I release this image into the public domain. Any trademarks, copyrighted material and any other intellectual property depicted in the image still belong to their respective owners. Category:Public domain

Drill bit

2012-05-14T15:48:39Z

pics

← Older revision		Revision as of 15:48, 14 May 2012
(3 intermediate revisions by one user not shown)
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	==Masonry Bits==		==Masonry Bits==
−	[[image:Masonry bit 0073-3.~~jpg~~\|400px]]	+	[[image:Masonry bit 0073-3.JPG\|400px]]

	These are steel drills with a piece of Tungsten Carbide welded or brazed into the tip. These "'''TCT'''" (Tungsten Carbide Tipped) masonry bits are easily recognised as the tip is wider than the shank. The tip is fairly blunt and cuts by crushing a small area of the workpiece under the hammer action of the drilling machine. If used without [[Hammers\|hammer]] action the tip wears away quickly.		These are steel drills with a piece of Tungsten Carbide welded or brazed into the tip. These "'''TCT'''" (Tungsten Carbide Tipped) masonry bits are easily recognised as the tip is wider than the shank. The tip is fairly blunt and cuts by crushing a small area of the workpiece under the hammer action of the drilling machine. If used without [[Hammers\|hammer]] action the tip wears away quickly.
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	Masonry bits are available in quite long lengths, typically up to 30cm for non-SDS.		Masonry bits are available in quite long lengths, typically up to 30cm for non-SDS.
		+

	==SDS==		==SDS==
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	===SDS Lengths===		===SDS Lengths===
−	[[image:1m 10mm SDS drill bit 4638-4.jpg\|~~600px~~]]	+	[[image:1m 10mm SDS drill bit 4638-3.jpg\|400px]]

	SDS bits are widely available upto 1m lengths		SDS bits are widely available upto 1m lengths
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	==Blacksmith's drills==		==Blacksmith's drills==
	[[image:Schlagbohrer_für_Mauerwerk_18_mm_Durchmesser,_Masonry_bit_1670-3.jpg\|400px]]		[[image:Schlagbohrer_für_Mauerwerk_18_mm_Durchmesser,_Masonry_bit_1670-3.jpg\|400px]]
−
	Large twist drills with reduced shank size. Same shank size across the range enables quicker bit changes, and the smaller shank enables use of large diameter bits in standard drills.		Large twist drills with reduced shank size. Same shank size across the range enables quicker bit changes, and the smaller shank enables use of large diameter bits in standard drills.
		+

	==Needle drills==		==Needle drills==
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	==Obsolete==		==Obsolete==
−	[[image:Yankee countersink 4210-2.jpg\|300px\|center]]	+	[[image:Yankee countersink 4210-3.jpg\|300px\|center]]

	Obsolete shank types are normally either usable as is, or the profiled end can be cut off to leave a round shank.		Obsolete shank types are normally either usable as is, or the profiled end can be cut off to leave a round shank.

File:Schlagbohrer für Mauerwerk 18 mm Durchmesser, Masonry bit 1670-3.jpg

2012-05-14T15:35:55Z

uploaded "[[File:Schlagbohrer für Mauerwerk 18 mm Durchmesser, Masonry bit 1670-3.jpg]]" Blacksmith's drill This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license. More info at http://en.wikipedia.org/wiki/File:Schlagbohrer_f%C3%BCr_Mauerwerk_18_mm_Durchmesser,_Masonry_bit_1670.JPG

Drill bit

2012-05-14T15:34:19Z

Blacksmith's drills: pic

← Older revision		Revision as of 15:34, 14 May 2012
(One intermediate revision by one user not shown)
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	==SDS==		==SDS==
	[[Image:SDS_Drillbit.jpg\|400px\|centre]]		[[Image:SDS_Drillbit.jpg\|400px\|centre]]
−	[[Image:~~Drill_masonry2~~.jpg\|400px\|centre]]	+	[[Image:Drill_masonry-4.jpg\|400px\|centre]]

	Hard masonry (such as some [[Mortar Mixes\|concrete]] & engineering bricks) require SDS machines and bits. These are similar in principle to hammer drills, but the machines deliver vastly more [[Hammers\|hammer]] energy to the bit, and the bits have a special shank which fits into the SDS chuck of the drilling machine with a quick-change locking mechanism, rather than the twist-grip (Jacobs chuck) of conventional drills. The reason for this is not just convenience in changing bits: an SDS bit is free to move back and forward a few millimetres in its chuck and the drilling machine delivers its [[Hammers\|hammering]] energy direct to the back of the drill bit.		Hard masonry (such as some [[Mortar Mixes\|concrete]] & engineering bricks) require SDS machines and bits. These are similar in principle to hammer drills, but the machines deliver vastly more [[Hammers\|hammer]] energy to the bit, and the bits have a special shank which fits into the SDS chuck of the drilling machine with a quick-change locking mechanism, rather than the twist-grip (Jacobs chuck) of conventional drills. The reason for this is not just convenience in changing bits: an SDS bit is free to move back and forward a few millimetres in its chuck and the drilling machine delivers its [[Hammers\|hammering]] energy direct to the back of the drill bit.
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	==Blacksmith's drills==		==Blacksmith's drills==
−	~~Large twist drills with reduced shank size. Same shank size across the range enables quicker bit changes~~, ~~and the smaller shank enables use of large diameter bits in standard drills~~.	+	[[image:Schlagbohrer_für_Mauerwerk_18_mm_Durchmesser,_Masonry_bit_1670-3.jpg\|400px]]

		+	Large twist drills with reduced shank size. Same shank size across the range enables quicker bit changes, and the smaller shank enables use of large diameter bits in standard drills.

	==Needle drills==		==Needle drills==

File:Drill masonry-4.jpg

2012-05-14T15:23:42Z

uploaded "[[File:Drill masonry-4.jpg]]" SDS masonry drill bit gnufdl1.2 more details: http://en.wikipedia.org/wiki/File:Drill_masonry.jpg