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build along for my bro

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Re: build along for my bro

Postby Dan » Wed Jul 13, 2011 5:08 pm

Now I am a bit spoiled to have a friend with a Bridgeport mill for my drilling tapping and riser limb pad machining.
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Dan
 
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Re: build along for my bro

Postby Dan » Wed Jul 13, 2011 5:10 pm

The next step was to cut and grind some thin wood and phenolic to laminate together for the limb tips.
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I glued them all together with plastic rap on the limb surface to get the correct limb radius. Once they are cured I taper them on the spindle sander.
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Dan
 
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Re: build along for my bro

Postby Dan » Wed Jul 13, 2011 5:12 pm

I then measure where the string groove is and prepare the limb glass before I smooth on the tip material for a cold cure.
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Next I lay out the limb shape and scribe it with a carbide scriber and cut it to shape on the band saw, I put on an old glass only blade for this. I cut very close to the scribed line.
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I then sand to the line on the 6”X89” Jet.
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Last edited by Dan on Wed Jul 13, 2011 7:31 pm, edited 1 time in total.
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Dan
 
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Location: West Michigan


Re: build along for my bro

Postby Dan » Wed Jul 13, 2011 5:14 pm

I made a simple guide for my string grooves to use with a chainsaw file, I was very happy with the results.
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I then relieve the file cut with a die grinder and 1” sanding drum.
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Dan
 
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Re: build along for my bro

Postby Dan » Wed Jul 13, 2011 5:16 pm

Now it is time to shape the riser, I cut out the sight window with the band saw leaving the shelf high and staying away from the area where I would blend into the top limb.
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I used a ½” router bit in the drill press to flatten out the riser and bring the shelf down, this riser is cut to center.
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Dan
 
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Location: West Michigan


Re: build along for my bro

Postby Dan » Wed Jul 13, 2011 5:17 pm

I then used a 1/2” ball nose carbide burr to put a ¼” radius on the inside of the shelf/sight window.
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I then used a 40 grit 2” diameter sleeve on the spindle sander to shape the top of the sight window
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Dan
 
Posts: 361
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Location: West Michigan


Re: build along for my bro

Postby Dan » Wed Jul 13, 2011 5:19 pm

I used a wood jig with the spindle sander with a 3” drum to hold a consistent angle on the limbs.
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Dan
 
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Re: build along for my bro

Postby Dan » Wed Jul 13, 2011 5:20 pm

I mounted the limbs on the riser and scribed the phenolic, and started to shape the riser using the spindle sander and rasps.
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Dan
 
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Re: build along for my bro

Postby Dan » Wed Jul 13, 2011 5:23 pm

My wife snapped a picture of me tillering the limbs and took another picture of me pulling the bow on the tiller tree.
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Here it is in the paint booth.
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Dan
 
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Location: West Michigan


Re: build along for my bro

Postby Dan » Wed Jul 13, 2011 5:25 pm

The finished bow specifications are. 62” 50# @ 30.5”
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