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Traditional Crossbow - BP style prod

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Re: Traditional Crossbow - BP style prod

Postby teagus » Sat Apr 16, 2011 3:02 pm

It's time to do it.

Wrap form with shrinkwrap (stuff used for wrapping goods on pallets).

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See the "1-10" scale? 4 (2 + 2) was perfect for 2 glass 3 lams and riser.

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record the event.

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glue-up. Sorry, no bow snot allowed on my good camera. Use your imagination.

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This was not easy. Need to re-think a pin concept.

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Hog-tied and ready for the hose. Second wrap and pressure strips. Did not have a one-piece 1 3/4" long enough so I used two for the td forms.

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Re: Traditional Crossbow - BP style prod

Postby teagus » Sat Apr 16, 2011 3:06 pm

Slow air-up to 72lbs. Too much? Too little?

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In the oven. Out at 8:30 EST.

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Re: Traditional Crossbow - BP style prod

Postby teagus » Sat Apr 16, 2011 7:57 pm

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Re: Traditional Crossbow - BP style prod

Postby Kirkll » Sat Apr 16, 2011 8:56 pm

Excellent teagus! :D :D :D i gotta get my hand on the plans for one of these things now... this is too cool!
http://www.bigfootbows.com/
kirk@bigfootbows.com


Only archers are fool enough to want to make a composite with natural materials and man made materials, and then bend it repeatedly...
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Re: Traditional Crossbow - BP style prod

Postby teagus » Sat Jun 11, 2011 4:34 pm

I started taking a look at the Ben Pearson prod and decided I needed that laser. I covered it with masking tape and marked centers at the string grooves. With the laser running, I aligned the marks at each end with the beam. Next, I marked the beam at the center. I found out the center line is offset. My current prod is offset also. This is cool that Ben had the same ideas I did. The offset centerline has to do with minimizing string drag while keeping the weight up. I will now true up one side of my blank to be the top. I will come down 3/4" (1 3/4" wide) and laser a centerline. Next, I plan to make a template of one half of the back side of the Ben Pearson prod including string grooves and centerline marks. Next, transfer the pattern to my prod blank.

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Re: Traditional Crossbow - BP style prod

Postby teagus » Sun Jun 12, 2011 9:36 am

Template time. Bottom of the cut-out meets the centerline. Just realized the cut-out is the prod sight window. Distance from centerline to string groove is 18 1/8".

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Re: Traditional Crossbow - BP style prod

Postby teagus » Sun Jun 12, 2011 1:56 pm

Trim limb with that blade BK uses. 24t x 7 1/4. No more ruined band saw blades. Thanks Sir.

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A little time on the large spindle sander. Looking bettter by the minute.

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SIght window on the small spindle sander. Sander came from a retired bowyer by the name of Reedy who belonged to Chieftans Archery Club.

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Need to rough in string grooves and drill the mounting hole through the riser.
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Re: Traditional Crossbow - BP style prod

Postby teagus » Fri Jun 17, 2011 12:22 pm

I was reading "Arrow Trade" mag. May issue had a story on Bear Archery and showed this technique for holding recurve limbs. Worked great.

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This operation should be performed before shaping the limbs. It's a perp thing.

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First stress test. Prod passed. I was stressed.

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21" long bolts. 11/32 125 gr. 3" fletch.

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15 yards

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2 shots - test over. Note penetration. Kirk, I just lost some weight recently. Hold off on that shirt. I might be looking at a XL.


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Re: Traditional Crossbow - BP style prod

Postby teagus » Fri Jun 17, 2011 12:28 pm

Tip overlays, finish sanding limbs, then weigh power stroke on old bow scale. Just put in order for new digital scale. Should be here by Tuesday. Thinking of a fixture to hold the prod and weigh one limb at a time to balance. :D
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Re: Traditional Crossbow - BP style prod

Postby teagus » Fri Jun 17, 2011 1:32 pm

Could not wait for digital scale. 10 3/4" power stroke. I think the string could be shorter - 10 1/2" ps. Do not know the original BP string length.

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Next prod will have a .040 parallel. Increase .010".
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