Electronics > Repair

How to repair bent rotary switch shaft?

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skipjackrc4:
I recently got one of the EDC MV-100 voltage "standards" on eBay.  Unfortunately, the most significant digit's rotary switch has a bent shaft, and refuses to turn more than a couple positions.  The knob was also shattered, but I can replace that easily enough.

Does anyone have an idea on how to repair this?  I have never attempted to straighten a shaft like this out before. 

I have attached a pic of the switch.  I can always buy a replacement 11 position switch, but good ones are expensive and I would rather keep the original one if possible.  Thanks in advance for any advice!

skipjackrc4:
Now for the pic...

WarSim:


--- Quote from: skipjackrc4 on August 26, 2013, 02:40:33 am ---I recently got one of the EDC MV-100 voltage "standards" on eBay.  Unfortunately, the most significant digit's rotary switch has a bent shaft, and refuses to turn more than a couple positions.  The knob was also shattered, but I can replace that easily enough.

Does anyone have an idea on how to repair this?  I have never attempted to straighten a shaft like this out before. 

I have attached a pic of the switch.  I can always buy a replacement 11 position switch, but good ones are expensive and I would rather keep the original one if possible.  Thanks in advance for any advice!

--- End quote ---

That switch is built from parts. It can be disassembled and the shaft can be replaced. Some parts snap into seats but can be unseated, but most assembly is via tabs. These days the shafts have gotten more expensive. If too expensive you will have better luck straightening the shaft when removed.

lowimpedance:
 No chance of finding a suitable size switch plate in a surplus junk store (depends on your location i guess) !!. Probably easier than to repair this one.
Who is going to see it when the covers are on and if functionality is restored does it matter if the switch plate is not original.
If not then remove the bent one and attach to a suitable bar of metal, which can be held in a vice. So the threaded portion is supported then use a small- ish adjustable spanner fitted over the bent bit (end on) and try to carefully bend it back to as straight as your going to get it. Use some emery to polish the shaft. Nothing to loose anyway at having a crack at it, good luck.
 Btw the shaft has a clip at the end of the thread section to retain it in the mounting plate, unfortunately here your shaft is bent so removing the shaft to work on it only will not be possible.

free_electron:
digikey still sells that kind of switch. buy one , rip shaft out, replace.

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