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techtalk:ref:tools030 [2020/05/20 04:48]
hippysmack ↷ Links adapted because of a move operation 		techtalk:ref:tools030 [2023/12/20 16:33] (current)
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 ====== REF: Tools & Fasteners ====== ====== REF: Tools & Fasteners ======
 ====== General Drilling and Tapping ====== ====== General Drilling and Tapping ======
- 
- 
-====== Thread Tap and Drill sizes ====== 
- 
-===== NPT =====  
-    * Pipe threads come either straight (nps) or tapered (npt). ​ ((DR DICK of the XLFORUM ​ http://​xlforum.net/​forums/​showthread.php?​t=1810036&​highlight=tap+die&​page=2)) 
- 
-    * Both are based on the pipe outside diameter as follows: 
-    * 1/8 pipe = .405 pipe dia.  ((DR DICK of the XLFORUM ​ http://​xlforum.net/​forums/​showthread.php?​t=1810036&​highlight=tap+die&​page=2)) 
- 
-    * 1/4 pipe = .540 dia.  ((DR DICK of the XLFORUM ​ http://​xlforum.net/​forums/​showthread.php?​t=1810036&​highlight=tap+die&​page=2)) 
- 
-    * 3/8 pipe = .675 dia.  ((DR DICK of the XLFORUM ​ http://​xlforum.net/​forums/​showthread.php?​t=1810036&​highlight=tap+die&​page=2)) 
- 
-    * The above sizes are the major dia of the male straight thread (as the pipe od is the major) and major dia. of tapered male thread at its big end (if fitting is made to the americian standard). ((DR DICK of the XLFORUM ​ http://​xlforum.net/​forums/​showthread.php?​t=1810036&​highlight=tap+die&​page=2)) 
-    * The tapered thread has diameter reduced on a taper of .0625 per inch of thread length. Almost all hardware store fittings will be tapered thread.((DR DICK of the XLFORUM ​ http://​xlforum.net/​forums/​showthread.php?​t=1810036&​highlight=tap+die&​page=2)) 
- 
-    * Little known fact: All iron heads pipe threads used in cases, rocker boxes, and oil pumps are straight female thread, fitted with tapered thread male fittings.((DR DICK of the XLFORUM ​ http://​xlforum.net/​forums/​showthread.php?​t=1810036&​highlight=tap+die&​page=2)) 
- 
-===== 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 ​ | 
- 
-===== AN Thread Sizes ===== 
-^AN Size^Metal Tube OD^SAE Thread Size ((info provided by 4th of July of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=1923879)) ^ 
-|3|3/​16"​|3/​8"​-24| 
-|4|1/​4"​|7/​16"​-20| 
-|5|5/​16"​|1/​2"​-20| 
-|6|3/​8"​|9/​16"​-18| 
-|8|1/​2"​|3/​4"​-16| 
-|10|5/​8"​|7/​8"​-14| 
-|12|3/​4"​|1-1/​16"​-12| 
-|16|1"​|1-5/​16"​-12| 
- 
- 
-\\ 
- 
-===== 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" ​ ^ | 
- 
-===== 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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 |Drill bit appears to be centered to the pilot. ((photo by Hippysmack))|Bit found the pilot and began drilling. ((photo by Hippysmack))|Later inspection revealed the pilot was placed off \\ center from the bit centerline. ((photo by Hippysmack))| |Drill bit appears to be centered to the pilot. ((photo by Hippysmack))|Bit found the pilot and began drilling. ((photo by Hippysmack))|Later inspection revealed the pilot was placed off \\ center from the bit centerline. ((photo by Hippysmack))|
-|{{techtalk:​ref:​svcproc:​center_punch_4_by_hippysmack.jpg?​direct&​300|}}|{{techtalk:​ref:​svcproc:​center_punch_5_by_hippysmack.jpg?​direct&​300|}}|{{techtalk:​ref:​svcproc:​center_punch_6_by_hippysmack.jpg?​direct&​300|}}|+|{{techtalk:​ref:​tools:​center_punch_4_by_hippysmack.jpg?​direct&​300|}}|{{techtalk:​ref:​tools:​center_punch_5_by_hippysmack.jpg?​direct&​300|}}|{{techtalk:​ref:​tools:​center_punch_6_by_hippysmack.jpg?​direct&​300|}}|
  
   * While using a drill press, watch the end of the bit when first engaging the pilot hole. \\ If the bit flexes to the pilot when spinning, it can be noticed before the hole is fully started and you can adjust the piece to the bit center from there. \\ (before plunging into the hole) \\   * While using a drill press, watch the end of the bit when first engaging the pilot hole. \\ If the bit flexes to the pilot when spinning, it can be noticed before the hole is fully started and you can adjust the piece to the bit center from there. \\ (before plunging into the hole) \\
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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)) \\
  
  

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