Thanks Herman. Yeah I know the diff between pressure and force, but in my haste I used them somewhat interchangeably.
So, this is the magic formula????
Yay!!!!!!
Yet another math question
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Re: Yet another math question
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Re: Yet another math question
Ok then, next step.
This is a picture of one of Siminoff's deflection testers. The braced rim is clamped around its perimeter, underneath, to the large plate. This gives open access to the braces for shaving, without having to flip over the assembly, shave, flip again and re-set up. I would like to do this with guitar tops.
He applies the given pressure/force (using H's formula above) from the bottom. That is also what I want to do.
Any ideas on how to apply that upward force??
This is a picture of one of Siminoff's deflection testers. The braced rim is clamped around its perimeter, underneath, to the large plate. This gives open access to the braces for shaving, without having to flip over the assembly, shave, flip again and re-set up. I would like to do this with guitar tops.
He applies the given pressure/force (using H's formula above) from the bottom. That is also what I want to do.
Any ideas on how to apply that upward force??
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Re: Yet another math question
Dave the next pictures show exactly how the device is constructed figs 11-18 thru 11-25 it pushing from the show side of the sound board like you want.
The U channel frame is capturing the bridge plate area inside and out --- slide the weight to match the torque reading -- 4 dial indicators are below in front and behind the bridge, I assume so you shave the X and tone bars evenly.
The U channel frame is capturing the bridge plate area inside and out --- slide the weight to match the torque reading -- 4 dial indicators are below in front and behind the bridge, I assume so you shave the X and tone bars evenly.
ken cierp
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Re: Yet another math question
I think the remaining photos show the torque (not deflection load) being applied to the bridge plate, not the show side?
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Re: Yet another math question
I like his set up and can see it would not isolate the torque.
But you could just use a small jack and an inexpensive load cell, you'd have to fasten the fixture to a superstructure to keep everything secure.
But you could just use a small jack and an inexpensive load cell, you'd have to fasten the fixture to a superstructure to keep everything secure.
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Re: Yet another math question
More simple yet --- bolt your fixture to a bench, get a small jack and a bath room scale put a board on top the scale, jack on top the --- crank away until you are at the lbs you want. (home made load cell!)
ken cierp
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Re: Yet another math question
I see the principle and it makes sense. There must be something more accurate than a bathroom scale though? (Mine weighs 20 lbs heavy when I weigh on it - for some reason it's right on when Ronda weighs herself :-))
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