Staking set - bit missing?

[p2n]

Picked up a staking kit from fleabay and as often with fleabay it's almost working lol

When you lock down the platter? table? it doesn't quite lock. The plunger doesn't quite pull down enough.

Not being familiar with this I can't work out if it's worn or there is a bit missing. I'm leaning towards the missing theory - maybe a shim under the table or a roller on the end of the locking shaft.

Anyone seen one of this model/type before?

[measuretwice]

when its assembled, am I safe in assuming that the reduced diameter eccentric portion of the shaft is in the hole?   If just extremely worn, said eccentric portion would not look round when viewed from the end.  My guess is there should a bushing on it - make something with the ID = the eccentric portion and the OD fitting the hole in the post.  I've not seen one like that before, just mechanically speculating

Edited March 24, 2018 by measuretwice

[p2n]

1 hour ago, measuretwice said:

when its assembled, am I safe in assuming that the reduced diameter eccentric portion of the shaft is in the hole?   If just extremely worn, said eccentric portion would not look round when viewed from the end.  My guess is there should a bushing on it - make something with the ID = the eccentric portion and the OD fitting the hole in the post.  I've not seen one like that before, just mechanically speculating

Yes.

As you rotate the locking shaft it should pull the pin down and clamp the table. But there is too much play. The shaft doesn't look worn or bent - so there must be something missing - either a shim under the table or as you suggest a bush on the end of the eccentric.

[measuretwice]

There doesn't look like any visible amount of wear there.  Have you a lathe?  just turn a brass bushing

[p2n]

4 minutes ago, measuretwice said:

 Have you a lathe? 

Yes ... but ...

Wrong size lol.

 

[measuretwice]

lol.....well, with a bit of ironwood,  maybe 

Edited March 24, 2018 by measuretwice

[p2n]

Thinking about it though - the collar wouldn't need to be a tight fit. Just so long as the outside diameter is less that the locking rod and the thickness was less that the distance between the pin and the edge of the lock rod... maybe I could find a bit of brass/copper tube at the hardware store and file it down ... hmmmmm

[measuretwice]

agreed....doesn't have to be fancy, worth a try

Edited March 24, 2018 by measuretwice

[p2n]

Make a brass bush - it's helped but it still won't lock.

If I make the bush thicker then the cam won't be able to turn past the 90deg point.

Can't work out what's going on here...

 

[measuretwice]

hmmm, apologies if I led you astray.  Looking at it again, perhaps what is required is a piece who's OD matches the post hole, and and has a hole to match the eccentric pin, but that the hole is offset by how much the pin is eccentric.  Clear as mud?  something of this shape:

 

 

 

[p2n]

I think I see what you mean. An insert into the vertical post? But doesn't that have the same effect as the bush?

I'm not as good with the CAD - let me draw this on paper and post back (probably tomorrow now).

Edited April 9, 2018 by p2n

[measuretwice]

yeah, I think you're right, the drawing above will just spin.  While i'm bouncing around a bit, it has to be the first idea, a bush with the OD close to the hole in the post....either that or a combination of the two, an offset hole but not offset quite as much as the eccentric pin.   

Edited April 10, 2018 by measuretwice