Author Topic: Been Quietly Working Behind The Scenes...  (Read 1088 times)

Online Mad Max

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Re: Been Quietly Working Behind The Scenes...
« Reply #20 on: June 11, 2022, 05:02:17 PM »
How thick was the Ipe when you started?
Was it tapered, and how much?
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Re: Been Quietly Working Behind The Scenes...
« Reply #21 on: June 11, 2022, 05:25:30 PM »
The back of bows stretch, and the belly compresses.

You WANT Wrinkles.  That will tell you the bows is working

So I have used the tape test...only with 1 inch wide painters tape because it was here. braced, then unbraced, but not drawn. The back is not showing much for wrinkles, the belly shows more particularly in the wider part of the limbs toward the fades. I would imagine have the relfex in the tips has an effect on the movement of the outer portion of the limbs without drawing the bow and this would be logical?
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Re: Been Quietly Working Behind The Scenes...
« Reply #22 on: June 11, 2022, 05:55:13 PM »
I have opted for the high tech "is the bow working" test....307.72 grain total weight arrows, 125 gr. points at the front.
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Re: Been Quietly Working Behind The Scenes...
« Reply #23 on: June 11, 2022, 09:41:08 PM »
Time will tell on how it works out. :dunno:
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Re: Been Quietly Working Behind The Scenes...
« Reply #24 on: June 11, 2022, 10:15:22 PM »
So far I think the biggest flaw design wise is the need to open up the sight window some more, which may happen soon enough. It's fine shooting 3 under, but not open enough if you hold a split finger style grip on the string.
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Re: Been Quietly Working Behind The Scenes...
« Reply #25 on: June 14, 2022, 05:42:09 PM »
Got over to do some shooting with friend today, and had the opportunity to get someone to take a pic with the bow at full draw. Limbs are looking good to me, anyone else see anything in the shape/arc that needs work for next time? Thanks
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Re: Been Quietly Working Behind The Scenes...
« Reply #26 on: June 14, 2022, 10:21:29 PM »
Bending to much at the fade on top limb and has some  flat spots on both

Edit--New pic.

« Last Edit: June 14, 2022, 10:35:57 PM by Mad Max »
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Re: Been Quietly Working Behind The Scenes...
« Reply #27 on: June 15, 2022, 08:34:59 AM »
Bending to much at the fade on top limb and has some  flat spots on both

Edit--New pic.


Exactly what I need to know, thank you. Should they be even, or should the top limb only be showing half as much due to a tillering difference between the top and bottom limbs for split/3 under shooting etc? All info I have seen suggests a wider gap at the fades to the string for the top limb when the bow is brace which would translate to something that looks like this when drawn....to be fair I watch a lot of Clay Hayes self bow builds.
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Re: Been Quietly Working Behind The Scenes...
« Reply #28 on: June 15, 2022, 09:12:41 AM »
The ellipse is just a guide so you can see what is going on.
Make yourself a Tiller gizmo for the next one..........https://www.3riversarchery.com/blog/how-to-make-and-use-eric-krewsons-tillering-gizmo/


How thick is the Ipe on that bow??

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Re: Been Quietly Working Behind The Scenes...
« Reply #29 on: June 15, 2022, 09:33:42 AM »
At the riser it measures .356 in., and tapers down to .235 in. at the tips
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Re: Been Quietly Working Behind The Scenes...
« Reply #30 on: June 15, 2022, 10:32:21 AM »
I thought it looked like it's bending too much at the fades top and bottom.  Hard to tell.  Hard to match the ellipse to photo angle.   Maybe map it?
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Re: Been Quietly Working Behind The Scenes...
« Reply #31 on: June 15, 2022, 10:46:36 AM »
I thought it looked like it's bending too much at the fades top and bottom.  Hard to tell.  Hard to match the ellipse to photo angle.   Maybe map it?

Could you offer some insight on how the mapping is done?
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Re: Been Quietly Working Behind The Scenes...
« Reply #32 on: June 15, 2022, 12:16:03 PM »
At the riser it measures .356 in., and tapers down to .235 in. at the tips


With it that thick it should be more than 27#.
I wouldn’t do any thing more to that bow
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Re: Been Quietly Working Behind The Scenes...
« Reply #33 on: June 15, 2022, 12:58:20 PM »
At the riser it measures .356 in., and tapers down to .235 in. at the tips


With it that thick it should be more than 27#.
I wouldn’t do any thing more to that bow

It would be safe to say the overall length, width of the limbs, and taper in the other direction are playing a role in the draw weight of the bow. The thickness of the ipe is just 1 part of the formula.
"All mushrooms are edible, some of them only once" a wise man aka Dave

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Re: Been Quietly Working Behind The Scenes...
« Reply #34 on: June 15, 2022, 09:51:30 PM »
  I agree with those boys... bending too much at the fades... Top limb even looks a little scary...  You are losing a lot of speed because the base of the limb is doing all the work... Kinda like lifting a 10 lb. dumbell straight in front of you... Your shoulder is doing all the work... Don't think like a soft ball, under hand, straight arm pitcher... Think like a hard ball pitcher and use your whole arm...

[/quote]

Could you offer some insight on how the mapping is done?
[/quote]

  This is how I map limbs...  I got 3 Tiller sticks... I think they are 16, 20 and 24" long... Get you a roll of paper from the art/craft store...  12 to 16 " wide...  Rip off a sheet about 36" and tape the corners to the table...  Put a piece of tape where your fades are on your bow for a reference point...  Brace your bow and lay it flat on it's side on the paper... Put a mark on the paper where your fade is and put a mark at the base of your tip overlay... Push your limb dow to the paper being careful not to distort its shape... Trace the back side of the limb on the paper... Make sure to trace about 6" past the fade mark... Lift up bow and draw a verticle line about 2" long where your fade mark is... Flip bow over and put it on the paper and compare bottom to the shape of top limb drawn on paper... Do this with each tiller stick staggering each line about an 1/8"...  Make a light box to put your drawings on and you can compare limb shapes from other bows...
« Last Edit: June 15, 2022, 10:07:15 PM by Shredd »

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Re: Been Quietly Working Behind The Scenes...
« Reply #35 on: June 15, 2022, 10:04:15 PM »
  Get one of these, real quick...  :thumbsup:  It will tell you how your limb is bending...  For a standard 'D' shaped bow, while braced, your limb should have a consistant radius for about the first half then after that
start gently flattening out...  And pretty flat for the last 4 to 5"... 

https://www.harborfreight.com/10-in-contour-gauge-58311.html?utm_source=google&utm_medium=cpc&utm_campaign=12169518939&campaignid=12169518939&utm_content=132281648786&adsetid=132281648786&product=58311&store=&gclid=Cj0KCQjwhqaVBhCxARIsAHK1tiNYFRh9EyhJpIU8U__kWiig19exOtPvP7bwI_Z_Mg73WliJ4aYY6HAaAqUxEALw_wcB

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Re: Been Quietly Working Behind The Scenes...
« Reply #36 on: June 15, 2022, 10:29:44 PM »

[/quote]

It would be safe to say the overall length, width of the limbs, and taper in the other direction are playing a role in the draw weight of the bow. The thickness of the ipe is just 1 part of the formula.
[/quote]

I've made Bamboo Backed Ipe before, so I am use to Ipe
The glass backing may not be doing its job
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Re: Been Quietly Working Behind The Scenes...
« Reply #37 on: June 15, 2022, 11:49:48 PM »
I appreciate all the feedback guys. @Mad Max I agree there may be a significant difference between the bamboo and the glass backing. At the beginning of this thread it seemed like this was uncharted territory combining these materials. It has been a valuable learning experience, and is still a fun bow to shoot. I will get around to mapping at some point although do not have the craft paper on hand just yet.
"All mushrooms are edible, some of them only once" a wise man aka Dave

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