2021 Bow Swap Progress Thread - Complete

[mmattockx]

You can buy endmills with a very small radius on the corners that will keep that from happening.
A 1/32" radius is plenty.  45 the outside corner of the limb butt.

I agree that riser is going to want to crack in those corners every time. I would say use a bigger radius for wood, more like 1/8" and radius or chamfer the corner on the limb for clearance. Even then I would be worried about the riser cracking there, it just isn't a good way to load wood.


Mark

[Crooked Stic]

I say a good size G10 Ibeam. maybe .375 might be good with your radius.

[Mad Max]

I agree stic--mmatt

[BO-R]

Vince, I built a TD with the limbs set into riser like that, it cracked in those corners.  Is that where the other one failed?   I built a new riser for the limbs of phenolic with 1/4" scales of bocote...

Kenny,
I actually have a G10 bed from pad to pad, the portion between the pads that looks one piece are multiple laminates of glass

On the bow handle that blew up was a deflex design,,I found a knot and worm hole that gave way under the stress.

see attachment...

[Shredd]

Weeeell...  It's a done deal...  She is on her way...  I hope the victim is not victimized...   

[Mad Max]

I won't be here to receive it

[kennym]

Good deal Vince! 

Shreddy, I be home or close by... 

[Roy from Pa]

Someone is going to be very happy...

[skeaterbait]

Finally got some shop time today and this build is being just as contrary now as when it started. I may have to rethink using a super lam, not matter how drastic I make the scarf joint it just doesn't want to hold together. I have it glued up once more and give a good full day to cure and see what happens on the next dry run.

[4 point]

Lonnie, if I understand what your saying the lam is a little to thick to make the bend of the riser with out popping the joint. If that’s what it is you could splice a piece in then you would have two joints but they would be moved away from the high stress bend area in the center of the riser.

[skeaterbait]

That is a great idea, especially since I have lost about 3 inches of length already. That would also give me a little more flat area to aid in getting a good fit for the form.

Thank you sir.

[Crooked Stic]

You can also make a short sled about 2 in. shorter than your riser. Dead center of that sled apply a few layers of masking tape to get a buildup in that spot. Now put your scarf joint on top of the tape and run it thru the drum sander. Thins the joint so it will flex.

[Longcruise]

Check in.  Should be laying up later this week.  Think I have the form issues handled.

[Roy from Pa]

 

[Birdbow76]

Thanks Shredd for a very nice bow. I haven’t shot a bow from someone else for several years. The bow I got in the swap is mid 40’s and 62”...perfect. Has a good amount of reflex and feels pretty quick with good tension on the string at brace height. It shoots really nice for me.

[Roy from Pa]

Very nice, congrats.

Good job, Rich.

[Shredd]

Glad you like it Mike...  Hope she works well for you...  That bow takes a 62" string...  I'm weird...  I write the string size on the bow...  No confusion then...   

[Shredd]

Thanks Royster...

[kennym]

Very nice!!

[Buemaker]

Very nice.