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Old 12th September 2012, 11:32 PM   #31
redjr is offline redjr  United States
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Thanks for the link mickeymoose. Perfect! Next time in HomeDepot I'm going to have a look around to see if they stock these , or similar couplers and small diameter tubes. Before Scott posted his link, I went in search of these extender rods and couplers. Interestingly, I could not find them at any of the parts houses I use. ie. Mouser, Newark, etc. Don't they exist as a common part - an accessory that may need to be used with pots in general? They are used in many commercial amps.

I built many a Heathkit in my day, and some even used these small hollow/solid tubes and couplers. Why are they so hard to find today? Like I said, I finally placed an order for some today via the link provided by Scott.

Rick
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Old 17th September 2012, 06:31 PM   #32
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Another idea which works well for me. Look for a 60Amp (or similar)
terminal strip similar to the one in the pic.
The brass inserts are perfect as shaft couplers, with about
a 1/4" dia hole and 2 set screws!

Easily available in most parts of the world and one terminal strip yields a
lifetime supply of couplers for me.

Click the image to open in full size.

12 Section 80 Amp Terminal Strip

The best quality inserts are found in ceramic terminal blocks.

Ceramic Terminal Blocks - High Temperature
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Old 17th September 2012, 06:50 PM   #33
redjr is offline redjr  United States
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Very smart quad. Great idea. Thanks for the suggestion.
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Old 17th September 2012, 07:16 PM   #34
von Ah is offline von Ah  United States
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Here is where I picked up some a few months ago:
www.surplussales.com Shaft Couplings

Lotsa other nifty bits from the same vendor...

Last edited by von Ah; 17th September 2012 at 07:19 PM.
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Old 17th September 2012, 07:39 PM   #35
redjr is offline redjr  United States
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Thanks von. Good stuff.
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Old 2nd December 2013, 10:22 AM   #36
nnx is offline nnx
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Default Home made extension.

I just made some extensions out of 6mm aluminium rod which is filed down on both sides to fit the slot in the pot shaft. Two small holes are drilled and the extension is riveted to the pot shaft using small nails or pieces of wire as rivets. Heat- shrink covers the finished joint. It is a bit tricky to get it straight, but the finished product seems to be worth the effort. Please enjoy!
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Old 2nd December 2013, 02:20 PM   #37
AndrewT is online now AndrewT  Scotland
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Neat filing job.

Quite a bit easier than a female knurled coupling !
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Old 20th December 2013, 01:01 AM   #38
nnx is offline nnx
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Thank you Andrew, the filing of the shaft is the tricky part. It needs to be fairly symmetrical, otherwise the whole thing will wobble. It would be easier if you used a small mill.

A knurled female coupling....? Hmmm....
Well, I guess you could make one out of an internally splined plastic knob by drilling a hole for the shaft in the opposite end and then gluing the shaft to the knob. I will try that next time!
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Old 12th January 2014, 02:00 PM   #39
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Hi, spent about an hour on the lathe and micro mill to make theses for my Naim Nac42.5 clone.

The rear brackets (float) on a neoprene pad, because I found it impossible to centre the connector with a pot with a flat on the shaft and they now rotate really smoothly, the front bracket has a pressed in 3 x 10 x 6 sealed bearing carrying the shaft. Bit of a pain but worth it in the end.

Click the image to open in full size.
086 by robertsearby, on Flickr

Last edited by Robahob; 12th January 2014 at 02:17 PM.
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