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Author Topic: Reflex caul  (Read 3291 times)

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Offline JonW

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Reflex caul
« on: April 23, 2019, 01:35:59 pm »
I made my old caul using a formula with vertical and horizontal lines and making the curve where they intersect. I got the formula somewhere online but can't find it now. Anyone know the formula I'm talking about?
« Last Edit: April 23, 2019, 01:50:22 pm by JonW »
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Offline Bayou Ben

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Re: Reflex caul
« Reply #1 on: April 23, 2019, 02:59:42 pm »
I don't have a specific formula.  But this has worked for me.

Figure out how much reflex you want, and where you want it.  For instance, you want 4" of reflex, starting 14" from the end. 
Now divide both of those measurements by lets say 7.  So starting 14" from the end, mark your form horizontal every 2".  Then mark your vertical every .57".  Connect the marks as per the picture. 
If you want your curve to be more precise, divide your measurements by a higher number. 
I draw them to scale on paper 1st to get the curve I'm after.
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Offline willie

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Re: Reflex caul
« Reply #2 on: April 23, 2019, 05:12:52 pm »
would there be merit in trying to approximate a curve that would be the same as the deflection the limb would undergo?

the shape of the curve being dependent on the width/thickness of the limb shape in question?
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Offline bradsmith2010

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Re: Reflex caul
« Reply #3 on: April 23, 2019, 06:01:54 pm »
my friend had one, and I traced his,, :)
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Offline IrishJay

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Re: Reflex caul
« Reply #4 on: April 23, 2019, 06:23:16 pm »
I typically just use a batten (1/4" dowel works well). Measure the depth of the curve across the width of your board and place a finishing nail, measure the length of the curve along the length of the board. Place the batten against the nails and push on the center of it to bend it to a nice parabolic shape between your 2 end points, the trace along the batten.
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Offline Bayou Ben

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Re: Reflex caul
« Reply #5 on: April 23, 2019, 07:19:26 pm »
Sorry, after re-reading my post I realize I have a way of complicating things. 
2” horizontal for 1/4” vertical should give you a nice shape for general straightening and adding a little reflex.
I think it was one of Steve’s post where I got this original idea.
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Offline JonW

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Re: Reflex caul
« Reply #6 on: April 23, 2019, 07:31:38 pm »
Quote from: Bayou Ben on April 23, 2019, 07:19:26 pm
Sorry, after re-reading my post I realize I have a way of complicating things. 
2” horizontal for 1/4” vertical should give you a nice shape for general straightening and adding a little reflex.
I think it was one of Steve’s post where I got this original idea.

I got my original formula by dividing my length in half. Vertical marks every six inches but I can't remember the measurement for my horizontal lines.
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Offline osage outlaw

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Re: Reflex caul
« Reply #7 on: April 23, 2019, 07:51:17 pm »
Gary Davis showed how to make a caul like that on his Rattlestick DVD.  He gave the measurements
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Offline JonW

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Re: Reflex caul
« Reply #8 on: April 23, 2019, 08:20:56 pm »
Quote from: osage outlaw on April 23, 2019, 07:51:17 pm
Gary Davis showed how to make a caul like that on his Rattlestick DVD.  He gave the measurements

Do you remember Gary's measurements Clint?
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Offline osage outlaw

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Re: Reflex caul
« Reply #9 on: April 23, 2019, 09:10:03 pm »
I can watch it in the morning and let you know.
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I started out with nothin' and I still got most of it left

Offline Bayou Ben

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Re: Reflex caul
« Reply #10 on: April 23, 2019, 09:11:54 pm »
I found the thread that I got this idea from. 
Attached is Badger’s responses on paleoplanet. 
Apparently this is the method that Gary Davis describes. 
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Offline Bayou Ben

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Re: Reflex caul
« Reply #11 on: April 23, 2019, 09:15:05 pm »
Forgot this one
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Offline Selfbowman

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Re: Reflex caul
« Reply #12 on: April 25, 2019, 06:03:26 am »
I did not know there was a formula! I just been bending a piece of wood or glass to what I think looks good.
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Offline Knoll

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Re: Reflex caul
« Reply #13 on: April 25, 2019, 07:37:36 am »
Not sure there's a "definitive formula".
Some of us just can't have fun unless there's a bit of math/measuring involved.
 :BB     >:D     :BB
« Last Edit: April 25, 2019, 07:43:12 am by Knoll »
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Offline JonW

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Re: Reflex caul
« Reply #14 on: April 25, 2019, 09:12:41 am »
Quote from: Selfbowman on April 25, 2019, 06:03:26 am
I did not know there was a formula! I just been bending a piece of wood or glass to what I think looks good.

Arvin old dogs can learn new tricks!
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