Ribbed shaft potentiometers

EBM_dude · 25th May 2010, 09:41 PM

I have some very nice knobs for ribbed shaft potentiometers. I just have no good potentiometers to go with them! All I ever get is either completely odd valued ribbed shaft ones (250K lin) or smooth shaft pots. Where in the world can I get some good ribbed shaft pots for volume regulation, like 50K log stereo?
Or is there a way to graft the ribbed shafts from broken pots onto the smooth shafters?

russo · 25th May 2010, 10:07 PM

Using some kind of epoxy or superglue should do it, I think

EBM_dude · 25th May 2010, 10:10 PM

Hmmm.... I think you gave me an idea there! I'm going glue the ribbed shaft into a rubber hose, then glue the smooth shaft into the other side of the hose. I have some Old EFI fuel hoses around that should do the trick. After cleaning, though....

mickeymoose · 26th May 2010, 11:27 PM

If the ribbed hole is bigger than the shaft I would use a piece of brass shim, like a sleeve around the shaft (available in auto body supply shops), if the shaft is bigger I would drill-out the knob. Either way you will need to install a set-screw to hold the knob to the shaft. E

EBM_dude · 26th May 2010, 11:35 PM

This is actually a much cleaner solution than that fuel hose stuff I came up with. The smooth shafts and the ribbed shafts both measure 6mm.

Hopefully I'm not destroying those nice knobs while converting them.

ArthurDent · 27th May 2010, 01:04 PM

Another suggestion would be to add a few layers of shrink tubing to the pot shaft until the knob fits snugly and doesn't slip anymore. This will keep the integrity of both the knobs and pots intact.
- Robert

EBM_dude · 27th May 2010, 08:29 PM

Thanks! I will definately try this one first.

25th May 2010, 09:41 PM	#1
EBM_dude diyAudio Member Join Date: Aug 2009 Location: Germany	Ribbed shaft potentiometers I have some very nice knobs for ribbed shaft potentiometers. I just have no good potentiometers to go with them! All I ever get is either completely odd valued ribbed shaft ones (250K lin) or smooth shaft pots. Where in the world can I get some good ribbed shaft pots for volume regulation, like 50K log stereo? Or is there a way to graft the ribbed shafts from broken pots onto the smooth shafters?

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25th May 2010, 10:07 PM	#2
russo diyAudio Member Join Date: Jan 2008	Using some kind of epoxy or superglue should do it, I think

25th May 2010, 10:10 PM	#3
EBM_dude diyAudio Member Join Date: Aug 2009 Location: Germany	Hmmm.... I think you gave me an idea there! I'm going glue the ribbed shaft into a rubber hose, then glue the smooth shaft into the other side of the hose. I have some Old EFI fuel hoses around that should do the trick. After cleaning, though....

26th May 2010, 11:27 PM	#4
mickeymoose diyAudio Member Join Date: Nov 2008	If the ribbed hole is bigger than the shaft I would use a piece of brass shim, like a sleeve around the shaft (available in auto body supply shops), if the shaft is bigger I would drill-out the knob. Either way you will need to install a set-screw to hold the knob to the shaft. E

26th May 2010, 11:35 PM	#5
EBM_dude diyAudio Member Join Date: Aug 2009 Location: Germany	This is actually a much cleaner solution than that fuel hose stuff I came up with. The smooth shafts and the ribbed shafts both measure 6mm. Hopefully I'm not destroying those nice knobs while converting them.

27th May 2010, 01:04 PM	#6
ArthurDent diyAudio Member Join Date: Mar 2010 Location: Montreal	Another suggestion would be to add a few layers of shrink tubing to the pot shaft until the knob fits snugly and doesn't slip anymore. This will keep the integrity of both the knobs and pots intact. - Robert

27th May 2010, 08:29 PM	#7
EBM_dude diyAudio Member Join Date: Aug 2009 Location: Germany	Thanks! I will definately try this one first.

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