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Old 11-08-2017, 08:20 PM   #11 (permalink)
 
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I use this one. . I guess what you recommend depends on what you get used to yourself.

Drill Size Conversion Table
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Old 11-08-2017, 09:32 PM   #12 (permalink)
 
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Quote:
Originally Posted by BillyBoy63 View Post
Hello Everyone
I have a question about drill bits
if you have a 27/64 drill bit what would be the equivalent or the same size in mm's
I guess I'm going to have invest in a good pair of calipers
thanks
BillyBoy63
check this out

https://itunes.apple.com/US/app/id1062399336?mt=8

iap Bushing & Tube Reference app
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Old 11-09-2017, 06:19 AM   #13 (permalink)
 
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William; I have often found that the drill bit specified is the "nearest commonly available" drill bit for the tube, not necessarily the best fit for the tube. I have a complete set of fractional, letter, and number bits and a metric set too. When I do a new kit, I start with an undersized bit and sneak up on the correct size using my drill bit chart. i want a close sliding fit with no play. After I find the correct bit, write down the size on the instructions and it goes in my folder for that pen kit.

Hope this helps....
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Old 11-09-2017, 08:26 AM   #14 (permalink)
 
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Drilling for pen tuubes is like horse shoes game. - close counts.

Prices for available low volume drill bits like a 10.7mm or 10.75mm bits is very high. Amazon had prices around $30 for a bit.

Use calipers on the outside of the tube as a starting point for the somewhere close choices.
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Old 11-09-2017, 01:42 PM   #15 (permalink)
 
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I use the charts and a plastic hole template. The template lets me see how tight or loose the bit is by inserting the actual bit through the hole. Carl
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Old 11-09-2017, 02:41 PM   #16 (permalink)
 
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Quote:
Originally Posted by BillyBoy63 View Post
Hello Everyone
I have a question about drill bits
if you have a 27/64 drill bit what would be the equivalent or the same size in mm's
I guess I'm going to have invest in a good pair of calipers
thanks
BillyBoy63
Grizzly tools sells a pocket reference book that has table and charts for almost everything. Or, you can just Google the question.
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Old 11-09-2017, 07:53 PM   #17 (permalink)
 
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10.5 is the answer your looking for. It will fit.
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Old 11-15-2017, 02:15 PM   #18 (permalink)
 
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interesting thread, I also have the same question
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Old 11-15-2017, 03:02 PM   #19 (permalink)
 
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Another thing to keep in mind is that the hole size that you get is very often material dependent. Alumilite, for example will almost always spring back somewhat after machining, although it may take a little bit of time.

I don't know if it's still available, but there used to be a chart basically identical to the one that Mal linked to available as an iPhone app.

Regarding KenV's comment, "Close counts", I couldn't agree more except when you're cutting a cap thread with a .8mm pitch; then that horseshoe had better be a leaner. Victornet sells metric bits from 10.1mm to 13.5mm in .1mm increments for $4.20 to $8.90 depending on size. Not cheap, probably Chinese, but sometimes you need the precision unless you have a boring bar which is probably a better alternative anyway.

My $.02
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