Author Topic: forward riser advice  (Read 606 times)

Offline savage1

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forward riser advice
« on: September 15, 2013, 06:34:00 PM »
Here is an old project with a new aporoach. This is my belly mount I am trying to convert to a front loader.

My concern is with riser strength. The stripes are going to be four layers of .030 glass. each.

What do you think? Any advice is welcome.

Lou

Looks like I need help posting pics.
Beetle kill, Usa.

Offline MoeM

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Re: forward riser advice
« Reply #1 on: September 15, 2013, 06:36:00 PM »
Yep pics would be usefull...

Offline Troy D. Breeding

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Re: forward riser advice
« Reply #2 on: September 17, 2013, 08:25:00 AM »
Finally got the pics uploaded so I could help post them for Lou.


 

 
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Offline macbow

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Re: forward riser advice
« Reply #3 on: September 17, 2013, 02:06:00 PM »
I think with the grain in that wood there is little strength.
Adding the 2 pieces of glass will be what gives it the strength and should work. Need a really good glue like smooth on.
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Offline Troy D. Breeding

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Re: forward riser advice
« Reply #4 on: September 17, 2013, 07:21:00 PM »
Not sure if your going to use this exact piece of wood or not, but I sure wouldn't consider it with those knots in the sight window. Even with the glass in the riser the knots are totally in the wrong spot.

Troy
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Offline savage1

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Re: forward riser advice
« Reply #5 on: October 02, 2013, 12:42:00 AM »
Thank you Troy.

The riser is a dummy out of plywood just to give me an idea of a rough geometry.

Putting in glass after Shaping is beyond this cobbler.

I drew the stripes in so you got the idea. I was just wondering if the general design scared anyone.

There no valor like that of a fool. I've had a riser fail before but it didn't have glass at all.

Lou
Beetle kill, Usa.

Offline NYArrow

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Re: forward riser advice
« Reply #6 on: October 02, 2013, 05:12:00 AM »
Nice looking bow! Hope it does well in aution!
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Offline beachbowhunter

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Re: forward riser advice
« Reply #7 on: October 02, 2013, 02:50:00 PM »
That shape makes me a little skittish. You might consider doing a sandwich lam with some G10 glass in the middle, or stacked phenolic like the Little Suckling recurves that have so much deflexion.
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Offline savage1

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Re: forward riser advice
« Reply #8 on: October 03, 2013, 04:01:00 AM »
If it doesn't bust my head open in the event of a failure, I will get some G10. For now, trying to keep from any more work into it.

At least I'm. Not alone in the skepticism. But if it holds it will shoot just like another bow I made out of scraps. Turned out to be my favorite to date but riser was only intended to give me some numbers and Would probably blow if shot regularly.

Lou
Beetle kill, Usa.

Offline Crooked Stic

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Re: forward riser advice
« Reply #9 on: October 03, 2013, 05:30:00 AM »
I think an ibeam would be stronger. But if you don't want that then a couple of pieces glass on the front would add  strength to the shelf and window area.
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Offline savage1

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Re: forward riser advice
« Reply #10 on: October 04, 2013, 02:39:00 AM »
I like beam construction too. So you think a beam instead of the glass stripes would be strong enough or do you mean in addition to the stripes?
Beetle kill, Usa.

Offline heartlandbowyer

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Re: forward riser advice
« Reply #11 on: October 04, 2013, 09:28:00 PM »
An I beam will be stronger than your glass stripe design. However it looks to me like you have more than enough meat left in the riser to be structurally sound. Think about how little material there is in the throat section on many of the Bowes made out there. Circumferences around the throat on many bows is less than five inches.

Use a dense hardwood and you will be fine. For pieces of mind for you throw your glass strips in. And for more insurance get ahold of big Jim I'm sure he will custom cut a piece of glass to use as a ibeam, looks to me like you'll need a piece around 3.5 in deep for your riser design.

Good luck keep use posted.

Cory

Offline Greg Szalewski

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Re: forward riser advice
« Reply #12 on: October 05, 2013, 12:33:00 PM »
That looks interesting Luis. I will want to give that a test drive when you get it done. Keep us posted on the progress.
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Offline savage1

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Re: forward riser advice
« Reply #13 on: October 06, 2013, 11:06:00 PM »
Greg,just the guy I'm Looking for. I lost my phone last week. Send me a text so I can get your no.

Lou
Beetle kill, Usa.

Offline ChuckC

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Re: forward riser advice
« Reply #14 on: October 07, 2013, 09:46:00 AM »
I am thinking that if you use the right piece of wood, it would likely be fine for bows under, say, 60# draw.  If you add "internal structure" it will stiffen and strengthen it better.  "I" beam (sandwich)using three pieces, or similar using a laminated board (Diamond wood and similar) looks to be better.  Using glass inserts along the "lines" you drew should strengthen and stiffen it also.

How about a Diamondwood (or similar)or phenolic center portion and pretty wood outer (from your drawing)separated by lines of contrasting glass or phenolic strips ? ?

Then let Greg shoot it first. . . .   :laughing:  

ChuckC

Offline savage1

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Re: forward riser advice
« Reply #15 on: October 07, 2013, 06:09:00 PM »
I always try to find someone else to "break in" a bow.

Lou
Beetle kill, Usa.

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