Ya all wanna see a BBO build?

[Roy from Pa]

Osage belly, purple heart core lams backed wif boo.

Osage came from Kenny M.

I prefer 1/4 sawn lams.

I run the Osage lams through the drum sander to an even 1/4" thickness.

https://youtube.com/shorts/4s7K3nzYsnU

Then do a Z splice and glue up with EA40.

[Roy from Pa]

Purple heart is tapered from 1/8th thick at riser to 1/16th thick at tips.

https://youtube.com/shorts/SG_Wluj3sjQ

Patterns for taper rate were supplied from Kenny M.

Cutting out a section of bamboo, I split it with a machette.

How I flatten the belly side of the boo.
At this point the nodes are not a problem, I just need a flat surface to layout my bows pattern.


https://youtube.com/shorts/1l08d81pS4A

[Roy from Pa]

I string the center line on the boo and cut that pattern out.

I then sand to the line and then taper the boo from 1/8th at the riser to 1/16th at the tips.

 

Before glue up, I lay all 3 pieces together and string end to end again to get it straight. Then I drill 2 holes in the riser section where the leather grip will cover them later, and drill a hole on each side of the tips for toothpicks to hold things straight when gluing up.

[Roy from Pa]

My form with the padding on it to protect the Osage from clamp damage.

I can position the mid limb center posts to get more or less deflex or reflex.

Wrapped in plastic wrap and clamped up on 2 inch spacing and the back of the boo is protected with little sections of bamboo cut out. I alternate the clamp position from side to side.

[Buemaker]

Of course we wanna see it and I am getting a bit envious seeing that nice piece of yellow wood.

[Roy from Pa]

I leave it in the hot box for 24 hours at 85 degrees.

[Roy from Pa]

Ok I've had my stress test posting all those pictures and videos for now:)

Seems videos only post in here as a picture if you hold the phone in a horizontal position to video. Vertical they come out as a text link? LOL

[Bee Trace Rambler]

Have you ever used Unibond for gluing a BBO?

[Roy from Pa]

All the time for the lams. I use EA40 only for the Z splice and tip overlays.

[Longcruise]

Bout time!  Was just thinking yesterday that you ought to do another tri lam build.   

[kennym]

Snowed out of the camp?  Always like to see ya work!

[OldRawhide42]

Any tricks for making the Z splice. Or is it cut it on a bandsaw and hope.

[Roy from Pa]

Matter of fact yes kinda. They got a lot of snow up there and the road into camp has a 200 yard long very steep hill that gets very ice covered cause it doesn't get any sunshine on it.

And I miss making bows:)

I layout the Z splice with a ruler then I cut it out on the bandsaw just leaving the line.
Then I fine tune it with my  bench belt sander. The belt sander has that narrow backing plate that only goes about half way up the back of the  belt. So I slide the Z splice into just the belt right above that backing plate. Simple as chit. I keep working it till I get a perfect fit. I Iike to have maybe a 1/64th gap for glue to settle into.

[Mad Max]

Yesssssssssssssssssssssssssssssssssssssssssssss ! Always

1/8" at the center of riser or at the tip of the fades???
Very exciting watching all those pieces going threw the sander in super slow mode.

You use lams on the form to protect the Osage?

[Jeff tech]

Yes I do too. Build away. JF

[Roy from Pa]

Yesssssssssssssssssssssssssssssssssssssssssssss ! Always

1/8" at the center of riser or at the tip of the fades???
Very exciting watching all those pieces going threw the sander in super slow mode.

You use lams on the form to protect the Osage?

Center of riser.
I slowed it down so you could comprendo there snickles:)
Yes old lams, had the same pair for years.

[mmattockx]

Then do a Z splice and glue up with EA40.

It's always great to see your builds, Roy.

I just wanted to throw something out there about the Z-splice. Since it's on the compression side and you are gluing a handle over that area anyway, why not use just a 30 or 45 degree angle cut across the lams? It's easier to get a good tight glue joint with everything straight (though I think you have enough extra width that isn't a problem for you) and the strength of the joint is more than adequate for the job.

Just a thought...


Mark

[Roy from Pa]

Just the way I was taught, Mark.

It just stuck with me, plus getting a nice Z splice is always a challenge.

LOL

[mmattockx]

Just the way I was taught, Mark.

It just stuck with me, plus getting a nice Z splice is always a challenge.

LOL

Nothing wrong with that and I understand challenging yourself to get it right. Once hunting season is over here I will be back to working on my next bow and I plan on using a 30 degree angle cut to splice the core and belly lam pieces together, so I will see if I have it right or not.


Mark

[OldRawhide42]

Roy I think I can picture what you are doing with the sander. We must have different sanders. I have a 6 x 80 griz  and a 6 x 48 delta. The griz might work.