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S Bolton · 10-02-2007, 09:31 PM

Does anyone know what metric drill bit size to use to drill holes for 1/4 and 1/2 inch router bits? I would want them to be just slightly oversized.

13 mm for 1/5 inch?

Thanks

sb

**bobj3** · 10-02-2007, 10:17 PM

HI SB

1/4" is not a big deal but when it comes to the 1/2" size well most don't have the right drill bit size,,, that's to say most have up to 1/2" in the drill bit set..or they jump to the 9/16" size.

This is what I do to get around the error...I find some plastic tubing that is 9/16 to 5/8" OD and has a 1/2" ID size..
Then drill the holes out with the Forstner drill bits to get that flat bottom in the hole.
I also do this for the 1/4" ones also this will help with the humidly that will nail the router bits.....

==========

Quote:

Originally Posted by S Bolton

Does anyone know what metric drill bit size to use to drill holes for 1/4 and 1/2 inch router bits? I would want them to be just slightly oversized.

13 mm for 1/5 inch?

Thanks

sb

**harrysin** · 10-03-2007, 08:50 AM

Hi Steve, I've just been busy with a vernier and the best I can do is:

For 1/4"..............6.5mm = 0.255"
.7.00mm=0.27"

For 1/2"..............13mm =0.51"

All three metric drills are "standard" sizes

**bobj3** · 10-03-2007, 10:58 AM

Hi Harry

What size drill bit do you use if you want the 1/2" hole to be just a bit oversize ?
say by .010 to .015

=======

Quote:

Originally Posted by harrysin

Hi Steve, I've just been busy with a vernier and the best I can do is:

For 1/4"..............6.5mm = 0.255"
.7.00mm=0.27"

For 1/2"..............13mm =0.51"

All three metric drills are "standard" sizes

**harrysin** · 10-03-2007, 10:15 PM

Bj. a 13mm drill which I measured last night was 0.51" which is 0.01 or 10thou. bigger than 1/2"

10-02-2007, 09:31 PM	#1
S Bolton Registered User Forum Geek Join Date: Mar 2007 Posts: 493 View S Bolton's Gallery	Report This Post! drill bit size for making router bit storage Does anyone know what metric drill bit size to use to drill holes for 1/4 and 1/2 inch router bits? I would want them to be just slightly oversized. 13 mm for 1/5 inch? Thanks sb
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10-03-2007, 08:50 AM	#3
harrysin Forum Contributer Supreme Forum King Join Date: Jan 2007 Location: Western Australia Posts: 3,333 View harrysin's Gallery	Report This Post! Hi Steve, I've just been busy with a vernier and the best I can do is: For 1/4"..............6.5mm = 0.255" .7.00mm=0.27" For 1/2"..............13mm =0.51" All three metric drills are "standard" sizes __________________ *Harry*
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10-03-2007, 10:15 PM	#5
harrysin Forum Contributer Supreme Forum King Join Date: Jan 2007 Location: Western Australia Posts: 3,333 View harrysin's Gallery	Report This Post! Bj. a 13mm drill which I measured last night was 0.51" which is 0.01 or 10thou. bigger than 1/2" __________________ *Harry*
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