Home › Forums › Electronics Restoration › Extending Potentiometer Shaft
- This topic has 7 replies, 3 voices, and was last updated 2 years, 10 months ago by
John Greenland.
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March 30, 2022 at 2:56 pm #18387
Les Dickson
CVRS MemberI had to replace the volume pot on my Philco 64 and the shaft on the replacement isn’t long enough. Does anyone have some advice on how to extent this?
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March 30, 2022 at 3:30 pm #18389Ralph Spracklin
Forum ParticipantHello Les
If it were me I would cut the shaft and sand it clean. and coat it with flux. Then fabricate a collar/sleeve from a length of 3/8 copper tubing, slip it overboth pieces of shaft and adjust the shaft to proper length. If the fit is too loose cut a small piece from collar/sleeve length wise (ie from end to end. and using vice grips squeese it tightly, making certain that both pieces are straight and inline and solder it, as you would a copper pipe in plumbing. I’ve done this sort of thing often. How much too short is it? I’m assuming the shaft is steel, not aluminium. Stand chassis on end making the shaft parallel to the work bench. If your soldering iron or soldering gun is not hot enough to do the job, use a propane torch on low fire. Don’t burn the house down!
Ralph
March 30, 2022 at 5:01 pm #18390John Greenland
Forum ParticipantLes,
Send me an email and let me know which one you want and with your mailing address.
No charge.
They are both 1/4 inch inside measurement.
Military polished steel.
The short one is 3/4 inch long
The longer one is longer !
Just kidding – 1&1/2 inches
2 set screws will be included
Regards
John G VO1 CATAttachments:
March 30, 2022 at 6:35 pm #18392Ralph Spracklin
Forum ParticipantOK Les, I will send you an email
Ralph
March 30, 2022 at 6:55 pm #18393Ralph Spracklin
Forum ParticipantSorry about that, It was John you were asking for your address. Actually I like John’s fix better. I guess you will have to cut the shaft of the old potentiometer
to the correct length and tighten up the coupler that John has suggested. Problem quickly solved.And John, where did you get those couplers? They are a handy thing to have. But sometimes you just have to make do, with what you have on hand.
And as they say, “Where there’s a will there’s a way.”Ralph
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This reply was modified 2 years, 10 months ago by
Ralph Spracklin.
March 31, 2022 at 1:02 pm #18398John Greenland
Forum ParticipantRalph,
Some people would call me a pack rat. Over the years I have always saved things that were salvaged from some piece of equipment that was not econmical to repair. These would have come from some thing with the pots well recessed from the front panle. I can not tell you where. I do have a couple of non conductive ones removed from an old scope, that had been dropped breaking the picture tube.
RegardsBTW, I have seen them on sale somewhere. If I think about where I will post a note.
March 31, 2022 at 2:52 pm #18400Ralph Spracklin
Forum ParticipantHey John
I made a coupler for my coil winder from a piece of hosehold shower hose using two small stainles steel clamps. It also acts as a flexible damper. And all at no cost, As I said, sometimes you have to make do with what you have on hand. As for the Pac Ratting, you are not alone, ask my wife.
I just Goolged “Steel Shaft Couplers”, they are available on-line in more varities and sizes than the sands on the sea shore. “Grainger” sells then here in Canada, but Ithink they are Trade exclusive??? Copy and paste the following.
Ralphhttps://www.grainger.ca/en/product/p/GGF6L012?cm_mmc=PPC:+Google+PLA&ef_id=CjwKCAjwopWSBhB6EiwAjxmqDUhuxVgXLLveQZ7rNfp91I36ajwbnyNYSUEvLsMEaMwUMETvk4tbhBoCs_QQAvD_BwE:G:s&s_kwcid=AL!3645!3!428123720819!!!g!1405289351725!&gclid=CjwKCAjwopWSBhB6EiwAjxmqDUhuxVgXLLveQZ7rNfp91I36ajwbnyNYSUEvLsMEaMwUMETvk4tbhBoCs_QQAvD_BwE&gclsrc=aw.ds
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This reply was modified 2 years, 10 months ago by
Ralph Spracklin.
April 1, 2022 at 4:18 pm #18401John Greenland
Forum ParticipantThanks Ralph,
I was about to make similar comment about their availability.
I have a couple of flexible ones as well as a couple that adapt a 1/4 in shaft to a 1/8 inch one.All the best
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