Colchester lead screw problem

[buffalow bill]

This lathe belongs to a friend of a friend but hoping to help.
The lathe is a Colchester Master 2500
Problem!
Lead screw not turning when engaged, but the collar at the gearbox output shaft is rotating.
From the pics it looks like a special drive arrangement/collar, ie not through a shear pin.
Q1 am I correct in the assumption that it isn’t a shear pin.
Q2 is the drive through a difficult to make component. (I’ve only seen the pics)
Q3 are spares available for this machine.

Q4 was that water in your dram?

Thanks Guys

[SemiSkilled]

Snap, I had the same on mine,

 just check all the levers are in the right place, especially the one furthest left, there is a shear pin but mine was OK, just me being thick

Lee

[buffalow bill]

Thanks Lee
Will pass the info on along with a note for some falling down juice!! 
Bill

[j_e_f_f_williams]

Hello,

I have an older Colchester Master Mk1 and contacted Clausing via e-mail and got manuals etc directly from them.  One of my parts needed repair and they were even nice enough to scan original parts drawings so I could relocate holes for over boring to add a larger bushing.  Might want to contact them to see if they can help with how it's arranged?

My shaft is driven by 2 balls pushed out into matching cups in the collar.  The balls have a screw mechanism to tighten them for the pressure to make this clutch mechanism work.  Not sure if it's the same on a 2500.  Can also send you a scan of how it is on the  Mk1 if you want.

TTYL, Jeff

[Jonny]

Newer Harrisons are the same (600 Group), just rotate the chuck whilst trying to engage a change of pitch. Or if it looks like its gone in, just rotate the chuck, check lead screw rotates.
Ive adjusted the indent line up 1-8 but equally could be the metric or imperial selector.

[buffalow bill]

Thanks For the replies guys. The info has been passed on and a result found.

Jeff  thanks for the offer but the problem has gone away!!!

Thanks again guys      

Bill