Repair a quick release vice

Gallery, Projects and General > How do I??

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RussellT:
Thanks Mike

I see some minor differences from the one I have - a couple of lumps of reinforement for two of the bolt holes, the fixed lug for the flat bar is cast in, and the shaft of the half nut is round not square. From that last one it seems to me that there isn't any wedging action - I thought that might be between two flat surfaces - one of which is the shaft of the half nut. In that case it's the spring that keeps the half nut against the thread.

My current suspicion is that the thread is worn so that the thrust face of the buttress thread is no longer square and so loading the vice forces the half nut out of engagement.

Any other thoughts?

Thanks again - going and taking the workshop to bits is beyond the call of duty.

Russell

tekfab:
Russell, the flat bar should be on "top" of the half nut operating rod, i'm guessing that there's a missing bracket/plate that locates the flat bar and stops it from going "over centre".
The torsion spring operates by holding the half nut in engagement and by operating the lever you release the half nut allowing you to free slide the vice.

Mike

RussellT:
Hi Mike

I think the mechanism is all there. It looks very similar to the mechanism on your vice. One edge of the flat bar sits in a notch in the half nut and the other edge is trapped by a screwed on tab of metal - cast on your vice.

The mechanism seems to work OK until I put some pressure on the vice handle - then the locking lever starts to move until it unlocks. :(

Russell

chipenter:
I have a similar vice if it pops at all positions then it is likely to be the half nut ,mine had a wear ridge on the nut scraped it out with a scraper made from a 3 corner file its fine now .

S. Heslop:
Might sound silly, but make sure the nut is the right way round. I reassembled my vise with it back to front and it took me a while to notice since it only jumped out on heavy clamping.

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