Trad Gang
Main Boards => The Bowyer's Bench => Topic started by: Shredd on March 04, 2022, 12:01:34 PM
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Any opinions on this.?? Curious as to what all your thoughts are...
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And now this...
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I got the pics from Face Book... 50# Bow...
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I don't think that is a very good design, the strips need to run the whole length
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Both broke on a glue line, after the break starts, it can do some strange stuff. :dunno:
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Glue line breaks on edge grain of oily wood?
The one on the left I can see. Nothing runs continously from end to end. All stress is on that glue line. The one on the right??? It looks like it should have held better.
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Do you know what was used for a accent strip? Looks like the glue didn’t adhere well to it.
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Looks like a glue line failure along the accent, but also poor design. The thumb and finger indentations at the top of the grip are aligned rather than slightly offset, the grip is cut deeply and very close to the accent. This results in the least amount of material, thereby the weakest point on the riser right at the centerline, top of the grip and up through the window.
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It looks to me like the sight window is too narrow toward the top of the riser. If you compare that to the smallest part of the grip you can see what I mean, especially on the black one.
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One other thought, I wonder if those are glass accents? Epoxy doesn't seem to adhere as tightly to glass as wood.
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I would like to know where thay got the limb beds from
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I agree with Kenny. Glass to wood issue is usually related to moisture. Possibly shrinkage after glue up?
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All good points and agree with most of them...
I personally cringe when I see glue joints like this (ending on the back of the riser) especially when they don't have a fiberglass overlay which would probably help immensely and may help cure this issue...
With this type of design you are totally relying on the adhesion of the glue to hold that riser together... I prefer to orient wood grains a glue joints to work with the stresses to make a strong solid riser... Aesthetics are never a priorty with me... A bow is a tool... I would rather have a plain jane, solid riser built out of one piece of wood vs something pretty with questionable accents in it... When you are focused on your target the looks of your bow matter very little... The beauty lies in how it shoots and hitting your intended target...
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A couple of layers of glass on the front may have prevented this. Still a bad design.
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Stunning aesthetically but perhaps lacking in architectural soundness. In archery, function MUST follow form!
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Not to quibble but I think it is the other way around. Function trumps form in bow building, otherwise we all would be sculptors rather than bowyers … jmo
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one common denominator looks like the same bowyer built them.
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Not to quibble but I think it is the other way around. Function trumps form in bow building, otherwise we all would be sculptors rather than bowyers … jmo
I think he meant that and just mixed up the wording.
And, it's no doubt true. We've all seen bows designed and built only with an aesthetic in mind.
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Ah, you’re probably right LC and yeah the balance between utility and aesthetic involves much personal design choice. For sure the eye candy can be taken to far but on the other hand if you make a tool why not make it purdy, eh?
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Agree.
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If I want purdy I'm putting my tools aside and buying a Blacktail... :goldtooth:
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I'd have to use my other tools a while to get one o those!! :laughing:
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True, true... :laughing: :thumbsup:
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The one on the right, the brown wood broke at some transverse grain, wood failure. The one on the left failed because the portion that needed to connect the limb pads, was not continuous. Design failure.
Unless of course they used crappy glue, or made some construction error, or........
Considering we know squat about these risers, its all speculation.
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Both broke on a glue line, after the break starts, it can do some strange stuff. :dunno:
I think that's a good possibility that it was phenolic or glass accent line. That and a bad placement where the accent line comes through the throat.
Footing and accent lines need to either run full length of the riser, or be capped with an overlay or the limb pad cap to keep it from separating. You need to always cap end grain. That's the weakest spot.
Poor design IMO
Arlo