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May 20, 2019 - 1:48:35 AM
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215 posts since 2/16/2017

Hi,

I'm walking through Wilko and happen to spot one of these, a bamboo tray for £2, the ol mind starts whirring and I'm thinking resonator, being the big spender I am I fork out the £2 and find that it's going to be exactly the right size for my banjo.

At this point I get a tad stuck, what am I going to make the flange out of? how am I going to make the flange? and how do Attach the flange to the resonator and the whole lot to the banjo? (never having seen or come across a resonator before).

At best it's going to be an interesting project, if it fails miserably I'll have something to put my dinner on!!! :-)


 

May 20, 2019 - 2:33:48 AM
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51493 posts since 12/14/2005

Does it NEED a flange?

If appearance is not important, and the banjo is not something you're going to want to resell, simply put a few long, slender eyebolts through the rim, and using spacers and more bolts, bolt the dish to them

For a less damaging method, drill a hole in the CENTER of the dish, and cobble up a way to hitch it to the co-rod, with spacers glued to the dish and just resting against the bottom of the rim.

May 20, 2019 - 2:40:44 AM
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215 posts since 2/16/2017

quote:
Originally posted by mike gregory

Does it NEED a flange?

If appearance is not important, and the banjo is not something you're going to want to resell, simply put a few long, slender eyebolts through the rim, and using spacers and more bolts, bolt the dish to them

For a less damaging method, drill a hole in the CENTER of the dish, and cobble up a way to hitch it to the co-rod, with spacers glued to the dish and just resting against the bottom of the rim.


Sounds like a plan, Was think of the center bolt idea, I think it would look nicer with a flange, do they have to be made of metal? does it affect the sound?

It's a shame the thing is bright blue, thought I could sand it down to the bamboo but it looks like the whole thing has been dyed which means sanding and painting. If it ends up looking hideous I might just whack some bolts in as aesthetics won't be an issue.

May 20, 2019 - 5:16:07 AM
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51493 posts since 12/14/2005

What about some super-strong magnets?

Glue a few to the underside of the rim, and matching N/S to the dish?
(N to N will cause the magnets to repel each other, like a bad First Date! cheeky)
Here's ONE, holding up a one pound hammer:
I put it in a plastic bag, touched the bag to the hammer, and lifted the whole thing.


May 20, 2019 - 6:02:40 AM
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215 posts since 2/16/2017

Ingenious!!!!!

May 20, 2019 - 8:11:34 AM
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845 posts since 1/9/2012

If your banjo has a co-rod and you're attaching in the center, one way to go is with a "double roller cabinet catch" (e.g., https://www.truevalue.com/shop/hardware/cabinet-hardware/cabinet-catches/double-roller-catch-with-spear-unichrome-1-25-x-5-in.  You drill a hole in the back, slip a nut in there, and attach it firmly to a long screw or threaded rod with a second nut on the outside.)

In any case, there should be some space between the the plate and the bottom of the rim.  I'd try 1/4" all around, using maybe four little spacers glued to the tray.

Regarding sound, I think about it as two issues: 1) what sound do you produce? and 2) which way does it go?  Any solid back will take care of 1) -- with some subtle issues regarding rim height and air gap.   Regarding 2), all sound spreads out, but the extra high frequency stuff provided by the solid back is more columnated  (directed) than the rest.  The standard flange design sends it out toward the audience.  A simpler flat disk back spreads it out a bit more.

(I plug my own work at every chance I get.  Beware; it's pretty geeky, but so am I: "The Resonator Banjo Resonator, part 2, What Makes 'em Really Crack?" -- http://www.its.caltech.edu/~politzer/resonator-resonator-2.pdf)

May 20, 2019 - 5:49:59 PM
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2586 posts since 5/29/2011

Regarding your question about the flange being made of metal, If it is not bearing any stress(i.e. one piece flange) or being crushed between bracket nuts and shoes, then it would not have to be made of metal. I have seen several old banjos that had wooden flanges with cut outs where the bracket shoes were. They used the center bolt to attach the resonator. You might also be able to cobble a flange out of a composite material that would serve the same function.
Just some ideas.

May 21, 2019 - 1:03:42 AM
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135 posts since 2/16/2010

Hi Ben, What diameter are these trays please? I'm always on the lookout for resonator substitutes. (in the UK)

Regards Richard.

May 21, 2019 - 1:38:15 AM
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Players Union Member

Helix1

USA

154 posts since 4/17/2019

The Bamboo has been pressurized and epoxy has been added to the Bamboo just before the press, thus the color and waterproofing 

I don’t use a flange to make bluegrass. Too heavy, no reduction in quality.  Middle Banjo in photo uses resonator and gold Tone Rez kit

Magnets and even Velcro can attach a Rez or other methods like bayonet


 

Edited by - Helix1 on 05/21/2019 01:40:42

May 21, 2019 - 3:13:52 AM

215 posts since 2/16/2017

Thanks chaps,

The info on Wilko's site says its....

34.5 x 34.5 x 4.5cm

Which sounds huge to me, I've got a 10" pot and I'd say there's 1" 1/2 all round which looks ok, big but not too big, would probably be ideal for an 11" pot.

I did have an inkling of an idea, inside UK power plugs there are flat brass pins which have a threaded end and a bolt, could use these as mounting points for the flange..... just a thought.

May 21, 2019 - 9:45:28 AM
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5818 posts since 8/28/2013

There's nothing wrong with a blue resonator, but if you want something even more interesting, you could add to that blue background. You could have someone paint clouds, airplanes, skydivers, or fish on it, or a big octopus with a pretty girl wrapped in one of its tentacles, her hair streaming upward and a few bubbles coming from her lips.

If you really feel you need a flange, one could be cut with a jigsaw from a piece of thin plywood, or even made from individual sections held in place by each hook.

May 21, 2019 - 10:18:41 AM
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Players Union Member

Helix1

USA

154 posts since 4/17/2019

He beat me to it. There is a head decoration group here
Ask about telling the difference between a ten and eleven from 100 yards
Pie plate resonators are more radial in projection
Pipe cap resonators clip frequencies and lose energy faster in my experience


 

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