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Author Topic: Draw force curve.  (Read 3089 times)

Offline Buemaker

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Draw force curve.
« on: May 03, 2021, 07:04:13 AM »
It would be interesting to hear how other people measure draw force curves. According to Blacky Schwarz if brace height is say 8 1/2 inch from deepest point of grip, then add 1 3/4 inch, that makes 10 1/4 inch. Since measuring in 1 inch steps at 10 inches will be zero and next measuring point will be 11 inches. That is how I have been doing it. I guess zero could also be at the string at brace height. How do you do it?
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Offline Mad Max

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Re: Draw force curve.
« Reply #1 on: May 03, 2021, 07:38:57 AM »
Quote from: Buemaker on May 03, 2021, 07:04:13 AM
It would be interesting to hear how other people measure draw force curves. According to Blacky Schwarz if brace height is say 8 1/2 inch from deepest point of grip, then add 1 3/4 inch, that makes 10 1/4 inch. Since measuring in 1 inch steps at 10 inches will be zero and next measuring point will be 11 inches. That is how I have been doing it. I guess zero could also be at the string at brace height. How do you do it?

Same as you :thumbsup:
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Online Longcruise

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Re: Draw force curve.
« Reply #2 on: May 03, 2021, 09:44:38 AM »
The way I do it is 8 1/4" would be zero.   
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Offline Bowjunkie

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Re: Draw force curve.
« Reply #3 on: May 03, 2021, 10:58:52 AM »
I've never bothered.  :dunno:
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Online Roy from Pa

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Re: Draw force curve.
« Reply #4 on: May 03, 2021, 11:03:19 AM »
Me neither..

My BBO bows are too fast as it is:)
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Offline Mad Max

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Re: Draw force curve.
« Reply #5 on: May 03, 2021, 11:23:24 AM »
Quote from: Longcruise on May 03, 2021, 09:44:38 AM
The way I do it is 8 1/4" would be zero.

8-1/4 would be 8-1/4 starting point next would be 9", pull your bow to 9" hold it and zero the scale, first measurement is 9 to 10".

from 8 1/4 to 9 does not really mean anything because it's not a full inch  :thumbsup:
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Shredd

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Re: Draw force curve.
« Reply #6 on: May 03, 2021, 12:03:56 PM »
Quote from: Longcruise on May 03, 2021, 09:44:38 AM
The way I do it is 8 1/4" would be zero.

   Yes...   8 1/4",  7 1/4", 6 1/4" brace heights would all be your zero's...

 Here is a tip when comparing you own bows with your own DFC setup...  Once I get my saddle settled in at zero...  I have an adjustment screw for my scale...  Most all of my bows are 7" brace height... Since 7 1/4" will measure somewhere between .30 to 1. pound I adjust that screw so that all of my DFC's start at .60 pound... With this method you can really compare the numbers more accurately...

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Online Longcruise

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Re: Draw force curve.
« Reply #7 on: May 03, 2021, 12:07:32 PM »
Quote from: Mad Max on May 03, 2021, 11:23:24 AM
Quote from: Longcruise on May 03, 2021, 09:44:38 AM
The way I do it is 8 1/4" would be zero.

8-1/4 would be 8-1/4 starting point next would be 9", pull your bow to 9" hold it and zero the scale, first measurement is 9 to 10".

from 8 1/4 to 9 does not really mean anything because it's not a full inch  :thumbsup:

True,  but when you actually have the curve in front of you,  it would not show the first 3/4" of draw.  The whole curve would be shortened and would not show the full increment of energy storage under the curve.

My method would start at 8 1/4 and go to 9" or it could go from 8 1/4 to 10.

Probably not that big of a distinction or difference.  :)
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Offline williwaw

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Re: Draw force curve.
« Reply #8 on: May 03, 2021, 01:03:30 PM »
there are a couple of methods used to calculate stored energy, and comparisions between bows could be complicated if brace height is not the zero point.

adding 1.75"  to  the deepest part of the grip is the amo way of standardizing draw lengths.   useful for when two bows are being compared when the draw length for both is assumed to be the same.
« Last Edit: May 03, 2021, 01:11:19 PM by williwaw »
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Online B-JS

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Re: Draw force curve.
« Reply #9 on: May 03, 2021, 01:27:36 PM »
Brace is Zero.
But i also measure by AMO.
So If the bow has a 7¼ Bracehight, 9 will be starting Point in the curve.
If Bracehight is 8½, curve Starts at 10¼.
The bow weight is by AMO, the drawlenght ist by AMO, so i measure the curve also by AMO.
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Shredd

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Re: Draw force curve.
« Reply #10 on: May 04, 2021, 06:34:46 AM »
  Oh Lordy Be...  I deleted my end of this conversation and am gonna forget that it ever happened...   :laughing:  :shaka:
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Online B-JS

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Re: Draw force curve.
« Reply #11 on: May 04, 2021, 06:41:31 AM »
You are confusing me a Lot.

Was there a missunderstanding?
Or is it still present and you are just out of the conversation?
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Shredd

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Re: Draw force curve.
« Reply #12 on: May 04, 2021, 07:08:45 AM »
I asked you about 5 posts back if you could somehow insert 10.25" into the graph... It went over your head...  I asked you to reread my post plus I think I asked you again... Still went over your head...

  Inserting a fraction in the draw length of a graph is a first for me unless I overlooked one somewhere... All the dfc's I have ever seen start on the inch and end on 1 inch increments...  That's why I asked you to post a pic of a graph starting at 10.25" and that went over your head also... 

  Oh well... this happens sometimes... At least I wrestled the answer I was looking for out of you...   :laughing:  Have a good one...
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Online B-JS

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Re: Draw force curve.
« Reply #13 on: May 04, 2021, 07:23:10 AM »
No need to be offensive.

Maybe because this is not my native language, we may talk about different Things.

If someone has a very precise machine to measure the dfc and start at exact 0, you also laughing at him?
I don't really know what just happens.

If someone wants to compare bows dfc s/e efficency Speed and whatever, there will never be THE RIGHT WAY.
The only right way would be to give all the bows to one Independent person, that measures all with the Same methods and the Same Equipment.
« Last Edit: May 04, 2021, 07:34:28 AM by B-JS »
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Offline Buemaker

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Re: Draw force curve.
« Reply #14 on: May 04, 2021, 07:23:57 AM »
It’s only rock’n roll, but I like it like it, yes I do. I think I will stick with Blacky’s way, he have tested tons of bows. But I kind of like zero at brace too, would be very simple. Perhaps I should test the same bow two ways and compare.
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Shredd

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Re: Draw force curve.
« Reply #15 on: May 04, 2021, 07:46:30 AM »
Quote from: B-JS on May 04, 2021, 07:23:10 AM
No need to be offensive.

Maybe because this is not my native language, we may talk about different Things.

If someone has a very precise machine to measure the dfc and start at exact 0, you also laughing at him?
I don't really know what just happens.

If someone wants to compare bows dfc s/e efficency Speed and whatever, there will never be THE RIGHT WAY.
The only right way would be to give all the bows to one Independent person, that measures all with the Same methods and the Same Equipment.

   Not offensive... just frustrated... It is just a language barrier thing...  I agree with the last half of your quote...
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Online Roy from Pa

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Re: Draw force curve.
« Reply #16 on: May 04, 2021, 07:47:47 AM »
See what you started, Bue?

LOL

I think everyone should just do it their way and let others do the same.

 :campfire:
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Offline Buemaker

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Re: Draw force curve.
« Reply #17 on: May 04, 2021, 07:59:26 AM »
Yeah, I should learn to keep my mouth shut :laughing:
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Online Roy from Pa

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Re: Draw force curve.
« Reply #18 on: May 04, 2021, 08:02:38 AM »
Say it isn't so?

LOL

 :laughing:
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Offline Mad Max

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Re: Draw force curve.
« Reply #19 on: May 04, 2021, 08:10:29 AM »
What came first.
The chicken
The egg
Or was there a Roster in there
 :laughing:
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