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Quick release woodworking vise question

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Forum topic by shampeon posted 660 days ago 2226 views 0 times favorited 11 replies Add to Favorites Watch
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shampeon

1273 posts in 781 days


660 days ago

Topic tags/keywords: woodworking vise quick release american scale co

I got a deal on an American Scale Co. No. 203 quick-release woodworking vise (nice and big and heavy) at the flea market the other day, and I’m trying to figure out if what it’s doing is a bug or a feature.

One side of the screw has no threads, so when you turn counter-clockwise a turn the bronze quick release nut disengages the screw and the rear jaw is free. When you turn it clockwise to tighten, though, it goes about 3/4 of a turn after the threads re-engage before locking up. Is this how it’s supposed to work? My Columbian quick release vise allows you to completely tighten the vise, but will disengage the nut when backing up a turn.

I disassembled the quick release nut housing, cleaned out all the accumulated gunk, filed down one a small section on the side that got distorted, and reset the spring on the nut, but it’s still happening. Pictures to follow.

-- ian | "You can't stop what's coming. It ain't all waiting on you. That's vanity."


11 replies so far

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shampeon

1273 posts in 781 days


#1 posted 660 days ago

Any ideas?

-- ian | "You can't stop what's coming. It ain't all waiting on you. That's vanity."

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TheCook

39 posts in 718 days


#2 posted 660 days ago

That seems weird to me. Both of my quick release vises unlock with something like a half turn counter clockwise and will turn all the way closed by spinning the handle clockwise. From your picture it doesn’t look like the locking mechanism can be installed backwards so that rules out my first guess…

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WoodKutter

29 posts in 2065 days


#3 posted 660 days ago

Looks like it is supposed to work that way. On my Colombian quick release vise the nut floats. When you turn the handle CW it engages the the nut with the lead. when turned CCW it disengages with the screw. On yours the nut appears to be in a fixed position. The flat on the screw is where it disengages from the screw. 3/4 turn CW and you’re tight.

Gary

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Sylvain

536 posts in 1097 days


#4 posted 660 days ago

The cover piece hiding behind the top rod on your picture does not seem to be symetrical.
So there seems to be two way to put it back.
You could experiment with this.

-- Sylvain, Brussels, Belgium, Europe - The more I learn, the more there is to learn

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shampeon

1273 posts in 781 days


#5 posted 660 days ago

TheCook: yeah, I assumed that that’s how all quick release vises work.

Woodcutter: the bronze nut actually does float. You can see the spring that holds it flush against the right side of the housing.

Sylvain: I’ll try flipping the cover around.

-- ian | "You can't stop what's coming. It ain't all waiting on you. That's vanity."

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shampeon

1273 posts in 781 days


#6 posted 659 days ago

Well, mystery solved, I guess. The nut wasn’t the issue. There’s a tab on the handle casting that prevents the handle from rotating. So I think it’s just supposed to tighten down 3/4 of a turn max. Strange.

-- ian | "You can't stop what's coming. It ain't all waiting on you. That's vanity."

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TheCook

39 posts in 718 days


#7 posted 659 days ago

That’s really bizarre.

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TopamaxSurvivor

14587 posts in 2273 days


#8 posted 659 days ago

From the looks of the pics, if it went all the way around, it would disengage when it hit the 360 degree mark. There is a plus, you can’t squeeze your wood too tight ;-)

-- "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

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OnlyJustME

1562 posts in 974 days


#9 posted 659 days ago

I have a quick release vice that works the same way but it isn’t a traditional looking vice with threaded rod. it has a saw tooth flat bar that engages to tighten on the work. the vice should still get plenty of clamping power in 3/4 turn. mine does. i’ll post some pics of it tomorrow.

-- In the end, when your life flashes before your eyes, will you like what you see?

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MNgary

235 posts in 1014 days


#10 posted 659 days ago

If it works, don’t fix it.

-- I dream of the world where a duck can cross the road and no one asks why.

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Sylvain

536 posts in 1097 days


#11 posted 659 days ago

As the nut is only 1/4 of a turn and as the screw has thread only on 3/4 of a turn, obviously if you turn more than 3/4 the screw would disengage again.

It is a bit like some thread used on canon :
http://en.wikipedia.org/wiki/Interrupted_screw
http://en.wikipedia.org/wiki/Rifled_breech_loader

-- Sylvain, Brussels, Belgium, Europe - The more I learn, the more there is to learn

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