Author Topic: Drilling limb bolt hole on a three piece takedown.  (Read 519 times)

Offline Sharp Shooter

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Drilling limb bolt hole on a three piece takedown.
« on: September 02, 2013, 08:40:00 PM »
I may have asked this question before. I've been using a brad bit to drill the holes for index pins and limb bolts, they seem to work best for me, but I still damage the glass when the bit goes through. I use masking tape, it helps but doesn't stop it. What do some of you do? Thanks Tony

Online kennym

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Re: Drilling limb bolt hole on a three piece takedown.
« Reply #1 on: September 02, 2013, 08:42:00 PM »
I either use a brad and just drill the point thru, then drill from other side or use a backer block clamped to the far side of limb.  Wish I knew a sure way to not get little splinters....
Stay sharp, Kenny.

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Offline MoeM

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Re: Drilling limb bolt hole on a three piece takedown.
« Reply #2 on: September 02, 2013, 09:08:00 PM »
I haven`t have built a 3piece jet but an overlay on the base shall solve the prob- drill smaller through it from the back and then desired dia from belly- I guess nothing can splinter then...

Offline carpin'mark

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Re: Drilling limb bolt hole on a three piece takedown.
« Reply #3 on: September 03, 2013, 08:44:00 PM »
I use an extra piece of tape or two where the bolt hole will come through, and a backer block like kenny said to support the glass. The extra tape seems to help hold the fibers down a little better, if I do get a tear, it tends to be small and usually easily fixed with a little dab of thin CA to wet it out.

Offline Sharp Shooter

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Re: Drilling limb bolt hole on a three piece takedown.
« Reply #4 on: September 04, 2013, 04:32:00 PM »
Thanks everyone!! Tony

Online Crooked Stic

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Re: Drilling limb bolt hole on a three piece takedown.
« Reply #5 on: September 04, 2013, 09:01:00 PM »
If you do get little frizzy edges on the hole- I use a 45 degree grinding stone in a drill to chamfer it back a bit. And don't force the drill bit through.
High on Archery.

Offline talkingcabbage

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Re: Drilling limb bolt hole on a three piece takedown.
« Reply #6 on: September 06, 2013, 02:27:00 AM »
I've started using a cobalt bit instead of a regular hss. It stays sharper longer and seems to not do the fray thang quite so much. But like crookedstic says, you can't force the bit. Go slow.
Joe

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One of two things will happen; it'll either work or it won't.

Offline Sharp Shooter

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Re: Drilling limb bolt hole on a three piece takedown.
« Reply #7 on: September 22, 2013, 09:50:00 AM »
Thanks everyone! I experimented a little, added a 1/16" phenolic to the face and belly worked good. Tony

Offline LittleBen

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Re: Drilling limb bolt hole on a three piece takedown.
« Reply #8 on: September 24, 2013, 09:54:00 AM »
I've never tried to drill through glass but I'd guess that a tapered grinding stone in a dremel or drill would do the trick ...

I'd proibably try drilling a small pilot hole, then opening it up wiht the grinding stone through both layers of glass, then finish up with a drill bit of the desired size through the ramainder of the limb, through the pilot hole.

Offline Saskquach

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Re: Drilling limb bolt hole on a three piece takedown.
« Reply #9 on: September 27, 2013, 02:33:00 PM »
I use these with a hardwood backing. Use less pressure as you exit thru into the backing

 http://www.leevalley.com/en/Wood/page.aspx?p=42352&cat=1,180,42240

Dean

Offline Sharp Shooter

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Re: Drilling limb bolt hole on a three piece takedown.
« Reply #10 on: September 27, 2013, 02:48:00 PM »
Thanks Dean!!

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