Trad Gang
Main Boards => The Bowyer's Bench => Topic started by: Shredd on April 03, 2021, 12:01:57 AM
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Came across this drawing on my FB pics... Tell me what it means...
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Looks like cross-sectional dimensions for the curvature of the ramps or the thickness of the lam running up it in an effort to solve a gap between the two.
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Looks like you were trying to instruct someone what to do about a gap in the glue joint on the riser. In option #1, 'The form could be padded (D) to move the air hose closer and put more pressure there. Or in option#2, the radius on the belly side of the riser could be increased to eliminate the need, mostly in the area of (E)?' And you probably also told them to be careful with the thickness of the fadeout area because the new radius would tend to change the rate of taper there. i.e create a difference between (B) and (F).... a crucial area.
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Looks like you were trying to instruct someone what to do about a gap in the glue joint on the riser. In option #1, 'The form could be padded (D) to move the air hose closer and put more pressure there. Or in option#2, the radius on the belly side of the riser could be increased to eliminate the need, mostly in the area of (E)?' And you probably also told them to be careful with the thickness of the fadeout area because the new radius would tend to change the rate of taper there. i.e create a difference between (B) and (F).... a crucial area.
I concur
We have a winner
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Anybody that eats green apples wif peanut butter should know that :laughing:
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Priceless....
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So, you say you drew it and don't know what or why?‽? :biglaugh:
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D is a shim to push the air hose down tighter, the rest is the theory ( good one) of straightening the curve to let the lam lay down better.
Reader's Digest anwser... :biglaugh:
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I learned years ago, if I'm going to make notes about something, I need to write it as though it's a message for someone else that doesn't know anything about the topic.
Sometimes I can still wonder what I was making notes about.
PS: MY WIFE TELLS ME I CAN HIDE MY OWN EASTER EGGS.
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does shimming the air hose really work?, It doesn't change the air pressure inside it.
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If you have a need to shim the air hose then your gap is too much. So the shim lessens the gap hoping for better glue line.
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Yes, it works, making the gap smaller in a certain area. And yes if you had to shim the entire bow that would need some attention! :o
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And always shim between the hose and the form. :o
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Your answers are good and you mostly have it figured out... But to solve the riddle no one has solved what 'C' is...
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C is the distance you place the hose pad D from the end of butt.
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"C" is your memory score. :bigsmyl:
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:laughing: :laughing: :laughing: :laughing: :laughing: :laughing: :thumbsup: :thumbsup: :thumbsup:
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C is the straight place at end of lam that helps it lay down
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Doesn't really matter, Shreddy prolly forgot he posted this thread:)
:laughing: :laughing:
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Your answers are good and you mostly have it figured out... But to solve the riddle no one has solved what 'C' is...
Gee, Rich only 160 fps?? None of it matters. Just throw the form on the firewood pile! :)
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Doesn't really matter, Shreddy prolly forgot he posted this thread:)
:laughing: :laughing:
He shoulda made a note ... :laughing:
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C is extra that will help it form to the riser and will be cut off later :tongue:
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What Kenny said, C was changed to be flat, or nearly so, to help allow the lam to lay tight to the riser at E.
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Looks like Rich forgot his trad gang sign on password:)
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What Kenny said, C was changed to be flat, or nearly so, to help allow the lam to lay tight to the riser at E.
I remember him telling someone having trouble with a gap to do that...
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Doing that would give you a leverage advantage to get more pressure in that area which would help to eliminate the gap.
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By George... I think you guys have got it... I will write more on it later...
I wonder if one of the tech guys/engineers would be kind enough to explain exactly what is happening to the lam by putting a flat spot at the last inch of the ramp and what happens when you have a radius at the end...
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I'm no tech guy, just a random nerd without credentials. I believe the end of the ramp is essentially a fulcrum. So a flat/square ramp would create a smaller fulcrum point putting more stress at one location on the lever, where a radiused fulcrum would potentially distribute the stress on the lever.
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That is the most strained part of any bow because of the leverage of the limbs. The fades are the transition between the working limb and static handle so some of the strain has to go into the fade to prevent the "small fulcrum" Flem mentioned.
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Cant wait to C what Rich has to say...
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Here are some drawings I did last night... I have been so busy... I will talk on them later... Or maybe some of you all could elaborate on them and explain better than I can... What's in my mind does not always come out on the keypad... ;) :)
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There is supposed to be an arrow pushing down between the two fulcrum points on drawing 'D'...
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Not easy designing a riser for a Hill bow huh? :laughing:
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Not easy designing a riser for a Hill bow huh? :laughing:
Very Very complex!! :biglaugh:
I'm not seeing the point of this but keeping an open mind.
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I'm not seeing the point of this but keeping an open mind.
Something about how it is harder to bend the end of the lam than the middle?
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Might be wrong but D looks right to me. You need an even bend throughout the riser as depicted in the drawing by extending the belly lam past the handle- If these angles are not right on a 14" steep swooped hill riser it could be catastrophic at the fades.....Don`t ask how i know that :bigsmyl: