Author Topic: Arvins 62" osage design (Read 2137 times)

Bob Barnes · « **Reply #45 on:** December 28, 2024, 12:59:56 am »

Arvin, since I own and shoot your bows...when you say it is a shorter version, you don't mean that you just bent it to your old form and then cut the ends off... You made a new form that allowed for the same deflex/reflex design, but in a shorter version?

Selfbowman · « **Reply #46 on:** December 28, 2024, 01:00:38 am »

I used my fancy new contour gauge that Willie gifted me. Now if I can learn how to use it. I pushed it down at every 4” and traced the contour on to my 1” graph paper. The edges on the end of the crown was the width every 4”. You can see the crown getting smaller as I went out the limb. I don’t know how that ends up in the computer design. Engineer problem.🤠I just have to build it!! I’ve got the bow straight and the edges real close to my thinking. This is better than building 50 bows to find out where the high stress areas are.SET that ugly happening.

Selfbowman · « **Reply #47 on:** December 28, 2024, 01:03:45 am »

No bob I used the same form but I might add more reflex if the computer says I can get away with it.

Bob Barnes · « **Reply #48 on:** December 28, 2024, 01:06:07 am »

I'm not one of the experts like yourself...but it would seem to me that "the tips have to be in front of the riser". how old school is that?

Selfbowman · « **Reply #49 on:** December 28, 2024, 02:11:42 am »

They are Bob .

Bob Barnes · « **Reply #50 on:** December 28, 2024, 11:22:29 am »

It looks like a hunting bow already.

Selfbowman · « **Reply #51 on:** December 28, 2024, 12:51:35 pm »

Bob it’s for flight. It will have a 25-26” draw from back of the handle and shoot a 23 inch flight arrow. The reason I shorten the design was I wanted to shoot a shorter arrow with less drag. That’s why I shortened the bow. Willie wanted to play with virtual bow and I’ve got Allen and Kevin adding there two cents in. It’s a fun project. Allen leans toward spreading the load more by deflexing the handle but hard head Arvin thinks otherwise.🤠🤠so I’m thinking he’s setting back watching hard headed Arvin.🤠🤠I’m sure we will be amazed if it turns out. Laugh at Arvin if it does not. That’s all good!🤠🤠🤠

willie · « **Reply #52 on:** December 28, 2024, 02:13:02 pm »

Quote from: Selfbowman on December 28, 2024, 01:00:38 am

I used my fancy new contour gauge that Willie gifted me. Now if I can learn how to use it. I pushed it down at every 4” and traced the contour on to my 1” graph paper. The edges on the end of the crown was the width every 4”. You can see the crown getting smaller as I went out the limb. I don’t know how that ends up in the computer design. Engineer problem.🤠I just have to build it!! I’ve got the bow straight and the edges real close to my thinking. This is better than building 50 bows to find out where the high stress areas are.SET that ugly happening.

this crown is gotta be accounted for some how and I have got an idea, although it might take a couple of days and be after the new year.

Could you find something like a paint can or a kitchen pan or whatever to set the gague with to a smooth radius and then trying various smooth radiuses to fit the countour gage to the crown. Try your gague on the stave in as many places as possible please.
Am I seeing in the pic of the graph paper, that the crown is a little flatter on one side of the stave than the other?

I got the 62" design pretty much plotted out in Virtualbow, and only have to make adjustments to the thicknesses depending on what we figure out to do about the crown.

will post some pics in a while.

Bob Barnes · « **Reply #53 on:** December 28, 2024, 02:55:33 pm »

Quote from: Selfbowman on December 28, 2024, 12:51:35 pm

Bob it’s for flight. It will have a 25-26” draw from back of the handle and shoot a 23 inch flight arrow. The reason I shorten the design was I wanted to shoot a shorter arrow with less drag. That’s why I shortened the bow. Willie wanted to play with virtual bow and I’ve got Allen and Kevin adding there two cents in. It’s a fun project. Allen leans toward spreading the load more by deflexing the handle but hard head Arvin thinks otherwise.🤠🤠so I’m thinking he’s setting back watching hard headed Arvin.🤠🤠I’m sure we will be amazed if it turns out. Laugh at Arvin if it does not. That’s all good!🤠🤠🤠

I have been following along on this new Flight bow of yours... I do like the profile with wide limbs and small tips...all reflexed. I have always thought that a bow shaped like this would be a top notch hunting bow, and I have used it on hickory bows in the past. If yours works out, I will have to try it with osage as well. Thanks for doing the work for us!

Selfbowman · « **Reply #54 on:** December 28, 2024, 06:08:34 pm »

Here is a end drop off the stave.

mmattockx · « **Reply #55 on:** December 28, 2024, 09:20:52 pm »

Quote from: willie on December 28, 2024, 02:13:02 pm

this crown is gotta be accounted for some how and I have got an idea, although it might take a couple of days and be after the new year.

Quote from: Selfbowman on December 28, 2024, 06:08:34 pm

Here is a end drop off the stave.

Willie, that is easily dealt with in autocad using the section properties calculator.

Arvin, assuming you are using the outer surface as the back I need to know how wide it is at the outer ring and how much crown there is. Measure crown by putting a straight edge across the outside edges of that outer ring and then measure to the highest part of the curve.

Mark

willie · « **Reply #56 on:** December 28, 2024, 11:23:59 pm »

Quote from: mmattockx on December 28, 2024, 09:20:52 pm

Willie, that is easily dealt with in autocad using the section properties calculator.

Arvin, assuming you are using the outer surface as the back I need to know how wide it is at the outer ring and how much crown there is. Measure crown by putting a straight edge across the outside edges of that outer ring and then measure to the highest part of the curve.

Mark

Hi Mark,
if you dont mind trying the calculator in autocad that would be nice.
The limb crossection at the fade the time looks like a segment of a circle who's radius is 3.5" on top of a rectangle, both elements being 2.6" wide. (my sketch here shows the heigth of the segment to be about .28" and the "equivelent' rectangular section from Virtualbow is 2.6" wide by .42" thick, but that thickness is still tentative and may not work further down the limb as there is a gentle thickness taper in spite of the bow being a pryamid back, thus It would be interesting to see if that composite section can be compressed in the vertical direction without the radius of gyration changing.