Author Topic: Sneak peek 2  (Read 5361 times)

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Offline Selfbowman

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Re: Sneak peek 2
« Reply #30 on: January 06, 2023, 01:12:43 pm »
 Ow pic
Well I'll say!!  Osage is king!!

Offline Selfbowman

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Re: Sneak peek 2
« Reply #31 on: January 06, 2023, 01:13:52 pm »
Pic
Well I'll say!!  Osage is king!!

Offline Selfbowman

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Re: Sneak peek 2
« Reply #32 on: January 06, 2023, 01:19:14 pm »
I am going to cut a 1”x1” cube from the belly drop. Round four edges as I did the limbs. These growth rings are real even in thickness. I will give the weight.
Well I'll say!!  Osage is king!!

Offline Selfbowman

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Re: Sneak peek 2
« Reply #33 on: January 06, 2023, 01:36:11 pm »
Point 0.5 oz
Well I'll say!!  Osage is king!!

Offline Selfbowman

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Re: Sneak peek 2
« Reply #34 on: January 06, 2023, 01:46:10 pm »
That’s about as good as I am at touchy-feely 🤠
Well I'll say!!  Osage is king!!

Offline Selfbowman

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Re: Sneak peek 2
« Reply #35 on: January 06, 2023, 01:54:13 pm »
Correction 41#@21”  That’s with string on no set.
Well I'll say!!  Osage is king!!

Offline Selfbowman

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Re: Sneak peek 2
« Reply #36 on: January 06, 2023, 02:35:26 pm »
I don’t know which one is right?
Well I'll say!!  Osage is king!!

Offline avcase

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Re: Sneak peek 2
« Reply #37 on: January 06, 2023, 03:32:58 pm »
That is some very high density osage. Specific gravity is at least 0.92 (57.5 lb/ft^3).

Offline mmattockx

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Re: Sneak peek 2
« Reply #38 on: January 07, 2023, 01:48:09 pm »
But I bought a digital caliper here are the results in thickness and width. Pardon my scribble.

Arvin, that's awesome! How on earth did you discover millimeters in Texas?  :o ;D

Just for future work, normally the 0 point is taken as the center of the bow and the numbers run out to the nocks. I don't know if I have time this weekend, but I will punch those numbers into David Dewey's spreadsheet and see what it has to say. I can't add in the tip reflex, but it will give me an idea of how those look for a flat bow.


I don’t know which one is right?

A few things for weighing the pieces.

1) You don't want the rounded edges, you want a true cube (or rectangular prism) to be able to calculate the volume accurately.

2) Try the scales in grams instead of ounces, they are a much finer unit and lead to better precision.

3) You also want to make your piece as big as you can so you aren't trying to weigh something that is so light the scale can't feel it. In general, try to be over 1% of whatever the maximum scale capacity is. Another thing that helps with light pieces is to put something heavier on the scale first and zero the readout with that on the scale, then weigh the test piece from that new zero point. Most scales are not very accurate at the extremes of their range and putting something on to get yourself into the middle of the range usually gives better results.

4) Weigh the piece 5 times and average the results if you get different numbers each time.


Mark

Offline mmattockx

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Re: Sneak peek 2
« Reply #39 on: January 07, 2023, 01:54:43 pm »
Correction 41#@21”  That’s with string on no set.

I missed this. Is this with the bow braced? Brace height?

Also, your bow center point will be 31.5" by your coordinate system?


Mark

Offline Bob Barnes

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Re: Sneak peek 2
« Reply #40 on: January 07, 2023, 02:21:44 pm »
Mark, Arvin's bows are typically 69" long.
Seems like common sense isn't very common any more...

Offline Selfbowman

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Re: Sneak peek 2
« Reply #41 on: January 07, 2023, 04:50:56 pm »
Here is bigger piece.113.85 mm x 38.73x21.09.  82 g add the 1x1 without the rounded edges 98g
Well I'll say!!  Osage is king!!

Offline Selfbowman

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Re: Sneak peek 2
« Reply #42 on: January 07, 2023, 04:54:59 pm »
Correction 41#@21”  That’s with string on no set.
[/quote

This Mark
Well I'll say!!  Osage is king!!

Offline Selfbowman

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Re: Sneak peek 2
« Reply #43 on: January 07, 2023, 05:07:50 pm »
Pic or this bow compared to my wide pyramid selfbow that set records. I traced my wide pyramid at brace. Cut out the plywood and screwed it to my caul, the bow took little set. This bow is close to the same profile. It might be interesting to see if I can duplicate the strung profile and get the same draw weight. This bow is 69”vs 67” of the old bow. I might have to build a 67” also.
Well I'll say!!  Osage is king!!

Offline Selfbowman

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Re: Sneak peek 2
« Reply #44 on: January 07, 2023, 05:13:27 pm »
Where you see the tracing behind the bow is where I will remove the mass. Ok Alan and Mark from the chart would this make since?
Well I'll say!!  Osage is king!!