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Nov 20, 2019 - 11:56:01 AM
12 posts since 11/2/2019

I have an open-back Goodtime and the action is a little high. I want to put the string height at factory spec, which is 1st string at 1/8” at the 22nd fret. I watched the Deering video on action adjustment and adjusted the coordinator rod to lower the action to just a little above factory spec.

Can I get some feedback on my pot diameter measurements to make sure I’m not putting too much stress on it? Can it take more adjustment to lower the action further?

Diameter parallel to coordinator rod = 9-5/8” (9.625”)
Diameter perpendicular to coord rod = 9-13/16” (9.8125”)

 

Please ignore duplicate post below.  Thought I was editing, but accidentally replied to my post...

Edited by - Dave_11 on 11/20/2019 12:23:24

Nov 20, 2019 - 11:59:36 AM

12 posts since 11/2/2019

quote:
Originally posted by Dave_11

I have an open-back Goodtime and the action is a little high. I want to put the string height at factory spec, which is 1st string at 1/8” at the 22nd fret. I watched the Deering video on action adjustment and adjusted the coordinator rod to lower the action to just a little above factory spec.

Can I get some feedback on my pot diameter measurements to make sure I’m not putting too much stress on it? Can it take more adjustment to lower the action further?

Diameter parallel to coordinator rod = 9-5/8” (9.625”)
Diameter perpendicular to coord rod = 9-13/16” (9.8125”)


Nov 20, 2019 - 2:32:22 PM

6536 posts since 8/28/2013

Most posts I've read say not to go past a 1/8 inch difference in those two measurements. You're already past that.

Nov 20, 2019 - 2:55:10 PM
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rudy

USA

14808 posts since 3/27/2004

Hi Dave,

Do check your relief before adjusting your coordinator rods.

Nov 20, 2019 - 3:19:10 PM
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882 posts since 1/9/2012

Another thing to check is the possibility that there is a small amount of adjustability in how high the neck sits on the rim. I'm certain that at least some time or other the holes in the rim were elongated. Try loosening the rod and bolt and see whether the neck can be shifted up a bit.

Nov 20, 2019 - 3:55:06 PM

628 posts since 2/19/2012

Warping the pot that much is a really bad idea. As stated above, see if you can't simply shift the neck up a little.

And as Rudy suggests, check for forward bow in the neck. If it's bowed more than a very small amount, it's bad. That should be addressed separately without risking the pot at the same time.

Nov 20, 2019 - 4:54:10 PM

12 posts since 11/2/2019

Thanks for the suggestions everyone.

The Goodtime has no truss rod, but this neck is really flat. Relief is somewhere between .008 and .010 (I don't have a .009 feeler gauge, but the .008 slides in easily and there is some deflection with the .010).

I loosened the coordinator rod and neck bolt (Goodtimes have one rod and a bolt), and I think the neck was pretty much at the top. Anyway, I pushed it up and tightened everything again.

When I re-adjusted the coordinator rod, I didn't crank it down as tight as last time, and have it well within 1/8" difference for the diameter measurements. The action is a little over 1/8" but I think I'll leave it there.

Edited by - Dave_11 on 11/20/2019 16:55:07

Nov 20, 2019 - 5:33:51 PM
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2703 posts since 2/18/2009
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You could also fit a slightly shorter bridge if you want to lower the action a little more without bending the rim.
Zach

Nov 20, 2019 - 6:23:08 PM

628 posts since 2/19/2012

quote:
Originally posted by Dave_11

Thanks for the suggestions everyone.

The Goodtime has no truss rod, but this neck is really flat. Relief is somewhere between .008 and .010 (I don't have a .009 feeler gauge, but the .008 slides in easily and there is some deflection with the .010).

I loosened the coordinator rod and neck bolt (Goodtimes have one rod and a bolt), and I think the neck was pretty much at the top. Anyway, I pushed it up and tightened everything again.

When I re-adjusted the coordinator rod, I didn't crank it down as tight as last time, and have it well within 1/8" difference for the diameter measurements. The action is a little over 1/8" but I think I'll leave it there.


It sounds like you're enjoying getting into the nuts and bolts, and the Goodtime is a great entry.  They sometimes get a bad rap for not having a truss rod, but the vast majority of the gazillions manufactured have no trouble with neck bowing.  My first banjo was a five string Goodtime, and I went through the same thing as you, using the coordinator rod to adjust the action a little.  That was a worthwhile learning experience, but it didn't really do much for my playing, and I took the pressure off the rod again.  My other Goodtime is a tenor, and it did have a bowed neck, almost certainly caused by someone putting massive strings on it.  I planed the neck on that one, grooved it for a truss rod, put on a fingerboard, refretted it, and now it's a favorite.  I don't advise doing it, but it was a really fun project. 

As Zach suggested, I'd try a 9/16" bridge on it (I think the originals are probably 5/8").  That opens up a whole new world of tinkering.  And personally, I'd consider slotting the holes in the rim a little if the neck is sitting low enough to cause high action.  

In any case, have fun and take time to play the banjo!

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