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Main Boards => The Bowyer's Bench => Topic started by: Shredd on April 03, 2021, 12:01:57 AM

Title: Riddle me This...
Post by: Shredd on April 03, 2021, 12:01:57 AM
Came across this drawing on my FB pics...  Tell me what it means...

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Title: Re: Riddle me This...
Post by: EvilDogBeast on April 03, 2021, 02:31:35 AM
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.
Title: Re: Riddle me This...
Post by: Bowjunkie on April 03, 2021, 05:19:59 AM
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.
Title: Re: Riddle me This...
Post by: Mad Max on April 03, 2021, 07:50:25 AM
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
Title: Re: Riddle me This...
Post by: Mad Max on April 03, 2021, 08:49:24 AM
Anybody that eats green apples wif peanut butter should know that :laughing:
Title: Re: Riddle me This...
Post by: Roy from Pa on April 03, 2021, 09:29:47 AM
Priceless....



Title: Re: Riddle me This...
Post by: Longcruise on April 03, 2021, 09:37:24 AM
So,  you say you drew it and don't know what or why?‽?   :biglaugh:
Title: Re: Riddle me This...
Post by: kennym on April 03, 2021, 10:26:26 AM
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:
Title: Re: Riddle me This...
Post by: Pine on April 03, 2021, 11:16:53 AM
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.
Title: Re: Riddle me This...
Post by: williwaw on April 03, 2021, 08:18:16 PM
does shimming the air hose really work?, It doesn't change the air pressure inside it.
Title: Re: Riddle me This...
Post by: Crooked Stic on April 03, 2021, 08:32:10 PM
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.
Title: Re: Riddle me This...
Post by: kennym on April 03, 2021, 08:35:30 PM
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
Title: Re: Riddle me This...
Post by: Longcruise on April 03, 2021, 10:05:53 PM
And always shim between the hose and the form.  :o
Title: Re: Riddle me This...
Post by: Shredd on April 04, 2021, 10:52:22 AM
  Your answers are good and you mostly have it figured out...  But to solve the riddle no one has solved what 'C' is...
Title: Re: Riddle me This...
Post by: Roy from Pa on April 04, 2021, 10:54:11 AM
C is the distance you place the hose pad D from the end of butt.
Title: Re: Riddle me This...
Post by: Pat B on April 04, 2021, 11:42:25 AM
"C" is your memory score.  :bigsmyl:
Title: Re: Riddle me This...
Post by: Roy from Pa on April 04, 2021, 11:52:21 AM
 :laughing: :laughing: :laughing: :laughing: :laughing: :laughing: :thumbsup: :thumbsup: :thumbsup:
Title: Re: Riddle me This...
Post by: kennym on April 04, 2021, 12:03:15 PM
C is the straight place at end of lam that helps it lay down
Title: Re: Riddle me This...
Post by: Roy from Pa on April 04, 2021, 12:10:15 PM
Doesn't really matter, Shreddy prolly forgot he posted this thread:)

 :laughing: :laughing:
Title: Re: Riddle me This...
Post by: Longcruise on April 04, 2021, 12:21:50 PM
  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! :)
Title: Re: Riddle me This...
Post by: kennym on April 04, 2021, 01:15:36 PM
Doesn't really matter, Shreddy prolly forgot he posted this thread:)

 :laughing: :laughing:

He shoulda made a note ...  :laughing:
Title: Re: Riddle me This...
Post by: Mad Max on April 04, 2021, 02:40:53 PM
C is extra that will help it form to the riser and will be cut off later :tongue:
Title: Re: Riddle me This...
Post by: Bowjunkie on April 05, 2021, 05:23:29 AM
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.
Title: Re: Riddle me This...
Post by: Roy from Pa on April 05, 2021, 05:46:38 AM
Looks like Rich forgot his trad gang sign on password:)
Title: Re: Riddle me This...
Post by: kennym on April 05, 2021, 08:14:46 AM
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...
Title: Re: Riddle me This...
Post by: Roy from Pa on April 05, 2021, 08:22:30 AM
Doing that would give you a leverage advantage to get more pressure in that area which would help to eliminate the gap.
Title: Re: Riddle me This...
Post by: Shredd on April 05, 2021, 09:42:48 AM
  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...
Title: Re: Riddle me This...
Post by: Flem on April 05, 2021, 12:20:33 PM
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.
Title: Re: Riddle me This...
Post by: Pat B on April 05, 2021, 07:36:41 PM
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.
Title: Re: Riddle me This...
Post by: Stagmitis on April 05, 2021, 08:56:41 PM
Cant wait to C what Rich has to say...
Title: Re: Riddle me This...
Post by: Shredd on April 06, 2021, 11:02:27 AM
   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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Title: Re: Riddle me This...
Post by: Shredd on April 06, 2021, 11:06:07 AM
There is supposed to be an arrow pushing down between the two fulcrum points on drawing 'D'... 
Title: Re: Riddle me This...
Post by: Stagmitis on April 06, 2021, 01:55:04 PM
Not easy designing a riser for a Hill bow huh?  :laughing:
Title: Re: Riddle me This...
Post by: Longcruise on April 06, 2021, 02:43:36 PM
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.
Title: Re: Riddle me This...
Post by: williwaw on April 06, 2021, 11:11:39 PM
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?
Title: Re: Riddle me This...
Post by: Stagmitis on April 07, 2021, 11:02:10 AM
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: