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No tension hoop, no J hooks, no shoes to tension the head.

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Dec 14, 2019 - 6:33:21 PM
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53258 posts since 12/14/2005
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Saw a home-made tenor banjo, with what SEEMED to be sink clips or screen clips applied directly to the epoxied flesh hoop.

So, I made a test body out of plywood and a piece of PVC sewer pipe, and put 8 clips on it.

They come 8 to a pack.
I would have preferred 16, but the store only had one pack left.

Tightened up fairly well, even with only the 8.


Dec 14, 2019 - 7:46:08 PM

995 posts since 4/13/2017

Very nice design! I wonder how one would get the proper head tension???

Dec 15, 2019 - 3:42:38 AM

53258 posts since 12/14/2005
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I imagine one would simply tighten the screws.Notice that there's a lot of space left, betwixt the head and the plywood flange, in the picture at Clip #3.

And speaking of the plywood flange:
Rather than waste a great deal of wood by cutting a ring out of a square, I plan on using two layers of arcs, overlapped and glued.
A bit more work, but a bit less wasteful.

Dec 15, 2019 - 4:04:39 AM
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1943 posts since 2/7/2008

You could use Tee-Nuts in the ply and machine screws to make the tension adjustment a little more granular and to avoid the screws pulling out of the ply...

Dec 15, 2019 - 4:15:07 AM

53258 posts since 12/14/2005
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Tee nuts indeed!
Part of the original concept.
This was just a cobbled-together test of the clips themselves, using what was already in the basement.
And I think 10 or 12 would be better than a mere 8.

Dec 15, 2019 - 5:57:42 AM

beegee

USA

21422 posts since 7/6/2005

The Squared Eel will have hurt feelings...

Dec 15, 2019 - 8:36:54 AM
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6574 posts since 8/28/2013

One problem I can envison is the weakness of the head mounting edge, ri, flesh hoop, or whatever that aluminum head bead or channel or whatever that edge is called. Those are not very strong, and when heavy tension is applied even a tiny bit unevenly, they can distort badly or even crack. It seems much like clamping a long piece of wood solely in the middle hoping that you'll get even glue squeeze out on the ends; you'll most likely just get a bad joint at the ends with a dent where the clamp has been applied. I can easily imagine a head edge that looks scalloped from the side.

The system is elegant and could certainly save costs, but I really do believe that an actual tension hoop is needed to keep everything even. It migght be barely okay with a large number of clamps, but 16 or even 24 might be insufficient.

Dec 15, 2019 - 11:10:43 AM

53258 posts since 12/14/2005
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Good point, Mr. Porgie.
It is an experiment.
I was once told
"There is no such thing as an unsuccessful experiment. At the very least, one may learn to NEVER do THAT again!"

If the edge gets too wavy, perhaps a steel hoop from the Craft Store, or a thin slice of the PVC sewer pipe could be set atop, to spread the pressure.

Dec 15, 2019 - 11:58:38 AM
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6574 posts since 8/28/2013

At least you are experimenting. I think the possibility of a PVC pipe should work, if the clips don't dig in too much. That, however, would constitute a tension hoop, something you are aiming to eliminate.

I agree that no experiment is a failure. I also believe that one can learn a lot about how to "never do that again!" by watching idiots at work. I've learned a lot from imbeciles, and once in a while one of them somehow actually comes up with a serendipitous solution to a vexing problem. If one doesn't know any idiots personally, they can frequently be found on YouTube.

Dec 15, 2019 - 12:15:39 PM
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53258 posts since 12/14/2005
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The municipality in which I dwell, is, in fact, legally described as the "VILLAGE of".
So, if they're looking to HIRE an idiot, perhaps I could recite some episodes from my past, and land the job.

Dec 20, 2019 - 7:59:41 AM

53258 posts since 12/14/2005
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Dec 20, 2019 - 12:43:56 PM

120 posts since 4/3/2009

Mike, is that pre-war PVC sewer pipe?cheeky

Dec 20, 2019 - 1:29:24 PM
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53258 posts since 12/14/2005
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cryingThere's always folks willing to start a new war SOMEWHERE!

Dec 20, 2019 - 8:24:17 PM

53258 posts since 12/14/2005
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Looks like I'm going to need more than a dozen clips.

Still trying to come up with something quick and cheap and easy for the do-it-ourselfers.


Dec 21, 2019 - 6:41:59 AM
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6574 posts since 8/28/2013

I would first try putting the screw closer to the edge of the banjo head, maybe even close enough for it to overhang the mounting ring. It might even be possible to eliminate the clip entirely and just use the screw heads to hold things in place. If the screws themselves are not wide enough, washers might be used.

You could also look around your hardware store for another type of clamp.

Another way might be to make another plywood ring for the top and sadwwich the head's mounting ring between it and the bottom ring.

Of course, there's alwayus the third option: Give up! I don't recommend that option, though, because I'm sure with your ingenuity, you can figure something out.

Dec 26, 2019 - 2:02:21 PM

120 posts since 4/3/2009

quote:
Originally posted by banjodobro56

Mike, is that pre-war PVC sewer pipe?cheeky


Mike, not starting a war, just making light of a pre-existing war.

I've always admired your out-of-the box (or should it be out-of-the round?) designs and pragmatic approaches.  You are having more fun building than I am, because you are actually building!  Good luck in your budget bracket quest!

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