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Main Boards => The Bowyer's Bench => Topic started by: mwosborn on May 17, 2017, 09:58:00 PM
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Planning my swap bow and have a question...
I made a recurve form this past winter and have made 2 bows on it. The first came in heavier than I wanted at #58. I reduced the stack and the second came in at #49 - just as the lam stack calculator predicted.
I want to make a #40 bow on my 3rd attempt and need to reduce the stack by .03. My question is if it makes a difference if I take this off of the parallel lam or the tapered lam?
Here are my first two stacks:
Bow 1 - .280 total
Glass - .04 x2
Parallel - .07
.003 taper - .130
Bow 2 - .265 total
Glass - .04 x2
Parallel - .06
.003 taper - .125
Thanks,
Mitch
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you might have to take some from both parallel and taper.. Some vendors don't like to grind a 003 tapers thinner than 0.125
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If .015 took off 9#, you want to take off .030 to go 9# more?
I'm not much of a recurve guy but that sounds like a lot. But the stack calc worked the first time!
I won't go less than .010 over the lam's taper which on a .003 taper is .108 so .118 is minimum for a .003.
That should give Roy a decimal headache!
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OMG..
Help, I just fell off my chair... LOL
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LOL
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You could also cut your tapers to length off of the thick end instead of the thin end to reduce stack.
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Thanks Kenny and Robert -
Kenny - I meant .03 from the original stack so the 3rd attempt would be .250 total. How's this look?
3rd bow - .250 total
glass - .04 x2
parallel - .05
.003 taper - .120
Sorry Roy!
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Yes, Bvas nailed it. that's what I do too. Some times you have to make stack height adjustments using the tapers since 040 fiberglass is sometimes not 040..I have seen it run 038 to 043. Same with grinding parallels, A good accurate dial caliper is a must have tool for me. I used to use digital calipers but switched over to dials 2 years ago.
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Originally posted by Robertfishes:
Yes, Bvas nailed it. that's what I do too. Some times you have to make stack height adjustments using the tapers since 040 fiberglass is sometimes not 040..I have seen it run 038 to 043. Same with grinding parallels, A good accurate dial caliper is a must have tool for me. I used to use digital calipers but switched over to dials 2 years ago.
X2
Be quite Kenny, your going to mess him up. :bigsmyl:
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You could also cut your tapers to length off of the thick end instead of the thin end to reduce stack.
That's how I make gwass bows too, Bvasy...
Robert, I hear ya dude. Gwass is not always what they say. That's why I quit making gwass bows...
Mitch, it's ok bro... I've been going to school for them decimal thing ah mah jigs...
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Cutting off the thick end should work just fine - thanks. I have a digital caliper that will have to do! ;)
Roy - can you get those bamboo backings down to .04? Be just like glass then! :D
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:D
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Nothing wrong with a digital, I still use my igaging digital when I build ILF limbs and wedges..but I got a good deal on 2 used Mitutoyo dials and they seem to be more user friendly for laminations..
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I prefer dial calipers too. Not sure why, just do.
More traditional I suppose... :biglaugh:
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quote:
Originally posted by kennym:
I prefer dial calipers too. Not sure why, just do.
More traditional I suppose... :bigsmyl:
Emailed you an order Kenny.