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Author Topic: Building a bow jigs  (Read 11203 times)

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Offline iowabow

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Building a bow jigs
« on: July 20, 2011, 11:23:14 pm »
I retitled this post so that people could share ideas and and discuss projects that they are working on. 


Ok when I was at twin oaks I had a discussion about how to build a bow bending jig.  I forgot to ask how long I need to make the jig.   Now my bow will be 62 inches long so should the jig also be 62 inchs long
« Last Edit: July 24, 2011, 09:00:19 pm by iowabow »
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Offline PEARL DRUMS

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Re: building a bow jig and new help
« Reply #1 on: July 20, 2011, 11:25:56 pm »
If your talking about a caul I make mine 72" so I can handle any length bow I may try. The shorter the bow the less relfex obviously.
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Offline iowabow

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Re: building a bow jig and need help
« Reply #2 on: July 20, 2011, 11:43:41 pm »
ok the jig was layed out so that it was divided in half and then each half into 12 segments along its length and width  Then progressive lines drawn and then cut along the line to create jig.
« Last Edit: July 20, 2011, 11:52:22 pm by iowabow »
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blackhawk

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Re: building a bow jig and need help
« Reply #3 on: July 21, 2011, 12:49:11 am »
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Offline Will H

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Re: building a bow jig and need help
« Reply #4 on: July 21, 2011, 01:01:39 am »
Blackhawk posted a pretty good link John. I used the same buildalong when I built mine, I just added a bit more curve. This should answer your questions.  :)
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Offline MWirwicki

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Re: building a bow jig and need help
« Reply #5 on: July 21, 2011, 01:16:28 am »
Okay try to picture this.  Start with a 72" 2x6.  Draw a center line with a tri-square across the width of the board (at 36 inches doing the math).  Draw subsequent lines 6 inches away from center on both sides of center.  The 6th line from center should be at the end of the board.  Now, take the end of the board,  start at the top draw 5 marks every 1/2 inch.  Do this on both ends of the 2x6.  The bottom (5th) mark will be 3-inches down from the top.  This will provide a 3 inch reflex at 72 inches.  So, if you draw a horizontal line from your first 1/2-inch mark to your 1st (6 inches from center) 6 inch mark you will have an intersecting point.  Do this for the 2nd 1/2 inch mark on the edge to your 2nd (12 inches from center) mark and so on.  Do this on both ends of the board.  Where each of the lines intersect, you will connect the dots forming your arc.  Cut out the arc.

Hope I explained it in words well enough.  If I didn't, I'll post a picture of one of mine.
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Offline iowabow

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Re: building a bow jig and need help
« Reply #6 on: July 21, 2011, 03:53:37 am »
It was explained to me that the curve becomes increasing greater at it reaches the tips due to the math in the layout.  I can't remember his name but he explained that the increase in ratio was required because the bow will tend to take more set as you proceed to the tips.  So I was wondering if that meant that each bow length would require a seperate jig so that the math ratio would work out corrrectly. 
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Offline Gus

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Re: building a bow jig and need help
« Reply #7 on: July 21, 2011, 05:17:17 am »
Gary Davis shows the making of a form complete with his math and layout. (picked up the DVD from 3 Rivers)

Rattlestick Bows.

I'll be building one this weekend...  ;D

-gus
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Offline Pappy

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Re: building a bow jig and need help
« Reply #8 on: July 21, 2011, 07:27:55 am »
Gary was who he was talking to.It is a good DVD. :)
Pappy
« Last Edit: July 21, 2011, 07:32:26 am by Pappy »
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blackhawk

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Re: building a bow jig and need help
« Reply #9 on: July 21, 2011, 08:35:02 am »
You can use the same form for most bows. You can increase or decrease reflex by using shims,and change where you want the reflex the most by shimming. That link will answer everything
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Offline MWirwicki

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Re: building a bow jig and need help
« Reply #10 on: July 21, 2011, 01:48:19 pm »
Yes, what I tried to type out is Gary's method.
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Matt Wirwicki
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Offline Buckeye Guy

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Re: building a bow jig and need help
« Reply #11 on: July 21, 2011, 04:22:14 pm »
Sounds like Gary's method !
yes you will want differant length forms for diff. length bows but only if your off by more than a few inches !
the video will show you that Gary uses several diff. ones
I recommend anyone that does not have the video get it!!!!
 Guy
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Offline Gus

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Re: building a bow jig and need help
« Reply #12 on: July 21, 2011, 04:58:16 pm »
Watching Gary's DVD even as I type this...

Sorry I have been known to beat a dead horse...  ;D

Yes Sir Pappy I do like Gary, he has been very helpful, and I like his style.
Have one of his bow staves leaning in the corner.
Being a new builder-in-training (can't say young cause I ain't) I use his stave and DVD for guidance quite a bit.
And I'm assembling one of his jigs this week.   :)
 
-gus
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Offline iowabow

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Re: building a bow jig and need help
« Reply #13 on: July 22, 2011, 01:34:08 am »
i will be ordering one tonight
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Offline iowabow

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Re: building a bow jig and need help
« Reply #14 on: July 22, 2011, 01:49:43 am »
Thanks everyone for responding to this post all of the information was great! I will post a few picks of the jig once I get it done.
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