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Main Boards => The Bowyer's Bench => Topic started by: Pheonixarcher on December 22, 2014, 11:46:00 PM

Title: .030 ul glass on a 3pc take down?
Post by: Pheonixarcher on December 22, 2014, 11:46:00 PM

I've read that you should only use ULS glass when drilling holes through your limbs because of the tendancy for UL glass to crack. Is this always the case, or is it possible to drill through UL glass without it cracking? If so, what has been the best method for the cleanest possible hole?

Title: Re: .030 ul glass on a 3pc take down?
Post by: JamesV on December 22, 2014, 11:59:00 PM

I have been told that forester bits work best. I drill mine with a metal cutting bit with no problems. Make sure you have a piece of wood backing the glass when you drill thur and go slow

Title: Re: .030 ul glass on a 3pc take down?
Post by: Bivyhunter on December 23, 2014, 08:04:00 AM

I drill through UL glass everyday and don't have problems. The only time I've seen issues is in areas of higher humidity where your core material or wedges pick up moisture through the limb bolt hole after the limbs are made and expand, causing the glass to split. To avoid this, seal the inside of your limb bolt hole with a Q-tip and finish or some cyno. Like James V said, back your limb up with a scrap piece of wood and drill with a sharp bit. I use a regular drill bit.

Title: Re: .030 ul glass on a 3pc take down?
Post by: T Folts on December 23, 2014, 08:39:00 AM

I have had one a few of my first set of limbs split in the area of the bolt hole but figured out it was the hole as south stated. ever since I seal the hole real good. I always cover my glass with backer to prevent chipping.

Title: Re: .030 ul glass on a 3pc take down?
Post by: Pheonixarcher on December 24, 2014, 02:28:00 AM

That's kinda what I thought. Thanks guys. Merry Christmas!