Author Topic: So ya all want a BBO build? (Read 30777 times)

oldandslow · « **Reply #280 on:** January 10, 2021, 08:43:32 PM »

And I thought 140 was hot!

Longcruise · « **Reply #281 on:** January 11, 2021, 12:21:33 AM »

Bingham makes it sound risky to be without adequate heat..........which, of course, can't be achieved without their thermostat.

kennym · « **Reply #282 on:** January 11, 2021, 10:54:24 AM »

Sorry yer knot got ya Roy.

I still heat all I build except the TD I've used hunting and target shooting for last 4 years .

I cured it at 70 in shop , but feel better about heat resistance when I heat . But it does cure at 70 I reckon...

Flem · « **Reply #283 on:** January 11, 2021, 12:20:21 PM »

Is it possible to leave a little extra meat around the pin knot like you would with a self bow?

Roy from Pa · « **Reply #284 on:** January 11, 2021, 01:29:20 PM »

These belly lams were quarter sawn and the pin knot ran the whole way across.

Should have cut it up when I seen the knot.

Thanks Kenny

kennym · « **Reply #285 on:** January 11, 2021, 03:02:22 PM »

On a positive note, it's still winter Rody ...

Roy from Pa · « **Reply #286 on:** January 11, 2021, 04:08:01 PM »

Rody?
LOL

I just seen the Kednny

LMAO

oldandslow · « **Reply #287 on:** January 11, 2021, 09:38:17 PM »

what is trapping?

Mad Max · « **Reply #288 on:** January 11, 2021, 11:08:35 PM »

Quote from: oldandslow on January 11, 2021, 09:38:17 PM

what is trapping?

Start at the fade and sand to the tip on 1 limb to make it weaker

mmattockx · « **Reply #289 on:** January 11, 2021, 11:40:58 PM »

Quote from: oldandslow on January 11, 2021, 09:38:17 PM

what is trapping?

Usually the chamfers are much bigger than shown in MM's drawing. It is called trapping because you make the limb cross section into a trapezoid (or close to it). The attached picture shows two ways to trap a bow limb. The wider side of the section is the belly side.

Fibreglass bowyers and wood bowyers tend to use it for different reasons. As MM says, it reduces limb stiffness. FG bowyers use it to drop weight when a bow turns out much heavier than intended. Wood bowyers use it to reduce stresses on the belly and increase them on the back. This is done because wood typically fails in compression well before it fails in tension. Trapping helps to balance the stresses so that the belly doesn't fail well before the back.

Mark

Roy from Pa · « **Reply #290 on:** January 12, 2021, 05:30:04 AM »

Trapping for a BBO bow is about the same as the facets I rasp in the back and belly edges of the limbs. But you take the facets on the back of the bow in further to trap it more like Mark stated above.

oldandslow · « **Reply #291 on:** January 12, 2021, 06:41:12 AM »

Thanks guys...that actually helps me understand why I may have broke a couple

oldandslow · « **Reply #292 on:** January 12, 2021, 06:44:09 AM »

Roy it's hard to judge in a picture, are you coming in about a 1/4 inch on the belly in those shots?

Roy from Pa · « **Reply #293 on:** January 12, 2021, 06:55:15 AM »

Yes, but as I move towards the tip area I narrow them more because the tips are 1/2" wide..

Prolly only 1/8th at the tips.

Mad Max · « **Reply #294 on:** January 12, 2021, 06:58:21 AM »

Quote from: oldandslow on January 09, 2021, 08:28:55 AM

Trying to picture the tiller process on a glass bow...

He asked this ? on comment #262
That's why I said one limb

my bad

oldandslow · « **Reply #295 on:** January 12, 2021, 07:20:43 AM »

Quote from: Roy from Pa on January 12, 2021, 05:30:04 AM

Trapping for a BBO bow is about the same as the facets I rasp in the back and belly edges of the limbs. But you take the facets on the back of the bow in further to trap it more like Mark stated above.

Bear with me now...I am a little slow.
So your saying that the back gets more chamfer than the belly?

Roy from Pa · « **Reply #296 on:** January 12, 2021, 07:38:41 AM »

Bear with me now...I am a little slow.
So your saying that the back gets more chamfer than the belly?

Only if you want to trap the back more.

I normally do the back and belly the same.

But trapping the back on a wooden bow is a good thing.

So yes you could put more chamfer on the back.

oldandslow · « **Reply #297 on:** January 12, 2021, 02:06:28 PM »

K. Good info. Thanks again!

oldandslow · « **Reply #298 on:** January 16, 2021, 07:22:14 PM »

Afraid to go past 23 inches...lol

oldandslow · « **Reply #299 on:** January 16, 2021, 10:37:04 PM »

I can see my left limb needs some work.
Anything else?

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Author Topic: So ya all want a BBO build? (Read 30777 times)

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