Post by: Kirkll on October 25, 2024, 03:23:01 PM
Here is a rough drawing i did showing the lay out, and a few pictures of the procedure.
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The riser layup has a 3/8" G-10 I-beam offset 3/16" so i can get a 1/4" past center cut shelf. Then i do a series of G-10 overlays on the back for the frame. I didn't include this overlay portion, but its self evident looking at the milling photos.
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In these next few photos shows the milling and drilling process. Note* This type of millwork is best and safest using a collet on your milling machine rather than a drill chuck. and very sharp cutters are necissary for cutting this G-10.
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First mill work done is for the ILF receiver plate. I had a bunch of these milled from aluminum at a machine shop years ago. these are milled with a 3/4" wide cutter that leaves about 3/32" gap on each side for lateral limb adjustment. Why it isn't shown in this photo, there are 10/24 threaded inserts drilled and tapped into the side of the G-10 to adjust these plates.
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Then i drill the bolt hole amd mill the bezel section. The bolts are T bolts or sex nuts if you prefer that come in through the back of the riser.
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This is done with a 1 1/14" cutter and gives a perfect reveal on a std bezel washer.
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There is a link below showing photos the finished riser shape with a sanding sealer.
https://photos.app.goo.gl/62jMkDQALQP1JwpYA
If you guys have any questions, fire at will..... Kirk
Post by: Kirkll on October 25, 2024, 03:29:51 PM
https://goo.gl/photos/kwioyLB1KvLhhrgh9
Post by: kennym on October 26, 2024, 08:18:51 PM
I've built exactly one ILF riser and with no milling tools, I said never again... :biglaugh:
Post by: Gib on October 27, 2024, 01:23:33 PM
Post by: Kirkll on October 28, 2024, 04:15:31 PM
Very nice , Kirk!
I've built exactly one ILF riser and with no milling tools, I said never again... :biglaugh:
Ya I’ll bet that wasn’t fun working with router jigs. It’s tough enough getting precise millwork done on these with a milling machine.
When I first got into building these things, I played with full pockets that tapered to the end of the riser and hid the sides of the limb. and I was using a tapered end on the riser width too, to match the std ILF limb shape…. Pain in the arse… looked funky to me.
I also tried milling these using high density action wood risers to try and get the cost down using all the G-10 . But…. The lateral limb adjustment screws stripped out to easily, or actually split the wood on occasion. So I quit building them using that material.
Now I did find a canvas/epoxy phenolic that was hell for stout that I would use again. It actually milled a lot like the G-10, but the aesthetics wasn’t popular. I’ve still got a 17” riser in stock if you want to look at the photo. It’s in my “In-stock Bows” section on this page.
http://bigfootbows.com/b/bows/bows.html