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techtalk:ref:tools030 [2021/01/27 23:24] hippysmack |
techtalk:ref:tools030 [2023/12/20 16:33] (current) hippysmack |
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====== REF: Tools & Fasteners ====== | ====== REF: Tools & Fasteners ====== | ||
====== General Drilling and Tapping ====== | ====== General Drilling and Tapping ====== | ||
- | \\ | ||
- | ===== Thread Tolerance ===== | ||
- | |||
- | Threads can be cut to a tighter or looser fit depending on the needs or sometimes availability of drill bit sizes. For instance, drill bits are available in a wide variety of sets or kits. The most common sizes are usually the ones that are provided. However, many suppliers carry a drill index kit which comes with a huge amount of drill bits in step sizes. Some are in 1/32 steps and some are in one thousandths increments. So, if you want a close tolerance fit on a 3/8"x16 threaded connection, you could use a 0.2969" pre-drill or for a looser fit you could use a 0.3230" pre-drill. Even with a standard 0.3125" drill bit, a hand drill is not going to produce a straight hole every time. If you have to over compensate with it and wallow out the hole just a bit to get it straight, you may be producing a looser threaded connection without realizing it. Care should be taken on tighter pre-drilled holes since it creates more friction and heat when tapping than a standard or slightly larger hole and it can lead to breaking taps off in the hole or cracking the piece you're working on. ((hippysmack from the XLFORUM)) | ||
- | |||
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Back them out, clean and re-lube them periodically to minimize any loose particles getting loose in your work area. \\ | Back them out, clean and re-lube them periodically to minimize any loose particles getting loose in your work area. \\ | ||
This also helps to control heat buildup. \\ | This also helps to control heat buildup. \\ | ||
- | | Lubing bits. ((photos by sifty of the XLFORUM http://xlforum.net/forums/showthread.php?t=1592463&page=5)) ||| | + | | Lubing bits. ((photos by sifty of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/146604-first-harley-1975-xl1000-caf%C3%A9-project/page5?t=1592463&page=5)) ||| |
|{{techtalk:ref:tools:lubing_bits_1_by_sifty.jpg?direct&300|}}|{{techtalk:ref:tools:lubing_bits_2_by_sifty.jpg?direct&300|}}|{{techtalk:ref:tools:lubing_bits_3_by_sifty.jpg?direct&300|}}| | |{{techtalk:ref:tools:lubing_bits_1_by_sifty.jpg?direct&300|}}|{{techtalk:ref:tools:lubing_bits_2_by_sifty.jpg?direct&300|}}|{{techtalk:ref:tools:lubing_bits_3_by_sifty.jpg?direct&300|}}| | ||
+ | |||
===== Make a Pilot Hole Before Drilling ===== | ===== Make a Pilot Hole Before Drilling ===== | ||
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====== Tapping ====== | ====== Tapping ====== | ||
- | Make sure to use sharp tap and dies. ((Shadowdog500 of the XLFORUM http://xlforum.net/forums/showthread.php?t=221093&highlight=split+rocker+box)) \\ | + | Make sure to use sharp tap and dies. ((Shadowdog500 of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/51523-question-about-my-rocker-oil-lines?t=221093&highlight=split+rocker+box)) \\ |
+ | |||
+ | ===== Thread Tolerance ===== | ||
+ | Threads can be cut to a tighter or looser fit depending on the needs or sometimes availability of drill bit sizes. For instance, drill bits are available in a wide variety of sets or kits. The most common sizes are usually the ones that are provided. However, many suppliers carry a drill index kit which comes with a huge amount of drill bits in step sizes. Some are in 1/32 steps and some are in one thousandths increments. So, if you want a close tolerance fit on a 3/8"x16 threaded connection, you could use a 0.2969" pre-drill or for a looser fit you could use a 0.3230" pre-drill. Even with a standard 0.3125" drill bit, a hand drill is not going to produce a straight hole every time. If you have to over compensate with it and wallow out the hole just a bit to get it straight, you may be producing a looser threaded connection without realizing it. Care should be taken on tighter pre-drilled holes since it creates more friction and heat when tapping than a standard or slightly larger hole and it can lead to breaking taps off in the hole or cracking the piece you're working on. ((hippysmack from the XLFORUM)) | ||
+ | |||
+ | \\ | ||
===== Removing a Broken Tap ===== | ===== Removing a Broken Tap ===== | ||
- | * The best way to remove a broken carbon steel tap is to use a small hole punch to the center of the broken tap and smack it with a hammer while exploding the hardened tap. You don't stand a chance at drilling it out without damaging the hole/ threads and chances are since pressure was enough to break the tap, it'll take more pressure than that to remove the broken lil stubby that's left. ((hippysmack)) ((Article by Oldrump1 [[http://xlforum.net/forums/showthread.php?t=1959533]])) | + | * The best way to remove a broken carbon steel tap is to use a small hole punch to the center of the broken tap and smack it with a hammer while exploding the hardened tap. You don't stand a chance at drilling it out without damaging the hole/ threads and chances are since pressure was enough to break the tap, it'll take more pressure than that to remove the broken lil stubby that's left. ((hippysmack)) ((Article by Oldrump1 [[https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-general-discussion-and-problems/181908-assembly-prep?t=1959533]])) |
+ | |||
+ | ===== SAE and Metric Tap Drill Sizes ===== | ||
+ | |||
+ | Below are standard pre-drill sizes for size taps used. These are common drill sizes and they are sufficient for most applications on a Sportster. ((Starrett tap drill sizes chart unless otherwise noted)) | ||
+ | |||
+ | ^ SAE Tap ^ Drill Size ^ Drill Bit | ^ Metric Tap ^ Drill Bit | | ||
+ | ^ Thread size ^ #/Letter ^ Diameter- in | ^ Thread Size ^ Diameter- mm / in | | ||
+ | |6x32 | 36 |0.1065" ^ |M3 x 0.5 |2.50 mm / 0.0984" | | ||
+ | |#6x40 | 33 |0.1130" ^ |M3.5 x 0.6 |2.90 mm / 0.1142" | | ||
+ | |#8x32 \\ #8-36 | 29 |0.1360" ^ |M4 x 0.7 |3.30 mm / 0.1299" | | ||
+ | |#10x24 | 25 |0.1495" ^ |M4.5 x 0.75 |3.70 mm / 0.1457" | | ||
+ | |#10x32 | 21 |0.1590" ^ |M5 x 0.8 |4.20 mm / 0.1654" | | ||
+ | |#12x24 | 16 |0.1770" ^ |M6 x 1 |5.00 mm / 0.1968" | | ||
+ | |#12x28 | 14 |0.1820" ^ |M7 x 1 |6.00 mm / 0.2362" | | ||
+ | |1/4"x20 | 7 |0.2010" ^ |M8 x 1.25 |6.70 mm / 0.2638" | | ||
+ | |1/4"x28 | 3 |0.2130" ^ |M8 x 1 |7.00 mm / 0.2756" | | ||
+ | |5/16"x18 | F |0.2570" ^ |M10 x 1.5 |8.50 mm / 0.3346" | | ||
+ | |5/16"x24 | I |0.2720" ^ |M10 x 1.25 |8.70 mm / 0.3425" | | ||
+ | |3/8"x16 | 5/16 |0.3125" ^ |M12 x 1.75 |10.20 mm / 0.4016" | | ||
+ | |3/8"x24 | Q |0.3320" ^ |M12 x 1.25 |10.80 mm / 0.4252" | | ||
+ | |7/16"x14 | U |0.3680" ^ |M14 x 2 |12.00 mm / 0.4724" | | ||
+ | |7/16"x20 | 25/64 |0.3906" ^ |M14 x 1.5 |12.50 mm / 0.4921" | | ||
+ | |1/2"x13 | 27/64 |0.4219" ^ |M16 x 2 |14.00 mm / 0.5512" | | ||
+ | |1/2"x20 | 29/64 |0.4531" ^ |M16 x 1.5 |14.50 mm / 0.5709" | | ||
+ | |9/16"x12 | 31/64 |0.4844" ^ |M18 x 2.5 |15.50 mm / 0.6102" | | ||
+ | |9/16"x18 | 33/64 |0.5156" ^ |M18 x 1.5 |16.50 mm / 0.6496" | | ||
+ | |5/8"x11 | 17/32 |0..5312" ^ |M20 x 2.5 |17.50 mm / 0.6890" | | ||
+ | |5/8"x18 | 37/64 |0.5781" ^ |M20 x 1.5 |18.50 mm / 0.7283" | | ||
+ | |3/4"x10 | 21/32 |0.6562" ^ | | ||
+ | |3/4"x16 | 11/16 |0.6875" ^ | | ||
+ | |7/8"x9 | 49/64 |0.7656" ^ | | ||
+ | |7/8"x14 | 13/16" |0.8125" ^ | | ||
+ | |1"x8 | 7/8" |0.8750" ^ | | ||
+ | |1"x12 | 59/64" |0.9219" ^ | | ||
+ | |1"x14 | 15/16 |0.9375" ^ | | ||
+ | |||
+ | ====== NPSC Tap Drill Sizes ====== | ||
+ | |||
+ | ^Tap / Thread Size ^Drill Size ((Starrett tap drill sizes chart)) | | ||
+ | |1/8-27 |11/32 | | ||
+ | |1/4-18 |7/16 | | ||
+ | |3/8-18 |37/64 | | ||
+ | |1/2-14 |23/32 | | ||
+ | |3/4-14 |59/64 | | ||
+ | |||
+ | ====== Slotting Holes ====== | ||
+ | |||
+ | {{:techtalk:ref:tools:enlarging_holes_by_hippysmack.png?direct&400|}} ((drawing by Hippysmack)) \\ | ||