Trad Gang

Main Boards => The Bowyer's Bench => Topic started by: anchorman on February 20, 2013, 03:02:00 PM

Title: glass thickness
Post by: anchorman on February 20, 2013, 03:02:00 PM
Was wondering if you increased the thickness of your laminations by .010 to compensate for using .010 thinner glass if it would change the way your bow shoots or draws. I know what I need as far as thickness goes using .040 glass but I am out of it and was wondering about the lamination thickness.
Title: Re: glass thickness
Post by: bigbob2 on February 20, 2013, 06:20:00 PM
From my experience thickness of glass and wood work to a different scale. On mine approx .003 wood = 1#, and glass some where around .001 per #. hope this helps.Of course this depends on taper rates, amount of parallels etc.
Title: Re: glass thickness
Post by: jsweka on February 20, 2013, 07:55:00 PM
Bob is right.  You will need to increase your wood stack disproportionately when decreasing glass thickness

In the last two straight limbed longbows that I made for myself I used a total stack of 0.440 with 0.050 glass and a total stack of 0.460 with 0.040 glass.  The one with 0.050 glass ended up heavier (63#) compared to the one with 0.040 glass (54#) even though the total stack for with the 0.040 glass was greater.

As far as shooting/drawing, I can't tell any difference. (I like 'em both.)