Largest suitable chuck on a Schaublin 102?

[Monarchist]

Ha ... That's where the "D" mounts come into their own Not going to happen on the Schaublin 102 or my Hardinge HLV-H

... hence the chuck(s) are more favoured in my environment.

John

Hardinge's own taper-mount was not a bad system for change time or repeatability, either.

And some DID use D1, no?

I suspect Schaublin had much the same goal as Hardinge, though.

If you needed another type workholder, why - it should be on its OWN lathe, 2, 3, or 6 ones down the line. "Onesies" were not their market, back in their heyday, either maker.

 

[swarfless]

As to the OP's original question the heaviest chuck Schaublin offered for the W 25 spindle was a 125 dia self-centring 4 jaw weighing 7.5 kg. All other chucks offered were lighter. Largest capacity offered was 150 dia independent 4 jaw. Yet largest backplate offered was 163 dia.

 

[Luke Rickert]

It might be worthwhile to verify the external diameter of the collar for a clamp ring to be used (I would strongly advice to use one, especially for the intended larger diameters). That collar diameter should be 60 mm, but at least in the past, these RC backplates would be secured on the lathe with a grub screw on the spindle (which I did not like) as the collars were too thick for a clamp ring. Or turn the collar back of course. They are steel, not cast iron but I don't think that matters really.

Charles

I agree a setscrew is a terrible idea but run a chuck without a clamp and without incident. But it is only 125mm and my machine does not have a brake and I only power tap with collets. On a screw cutting lathe obviously the lock ring is critical and still I would be nervous with all those reversals. I am happy the 135 is a D mount

I have a couple plates from a certain Czech gentleman that do have clamps but would not suggest that route as the threads need to be re-cut deeper since they do not fit the spindle nose threads.

Luke

Sent from my Moto G (4) using Tapatalk

 

[cinematechnic]

I have a 150mm (6") Pratt-Burnerd 4-jaw independent chuck that was meant for the Schaublin 102 and had a Schaublin part number on the box. It has integral W25 thread (not an adapter) with the spindle clamp.

However, it is very light for a 6" 4-Jaw, made from an iron casting that is mostly hollow. I'll weigh it when I get a chance and post here.

So what I'm saying is: 150mm / 6" is about the max for a 102 as long as the chuck weight is kept low.

 

[Luke Rickert]

W25 - SWISS MACHINES SHOP

These guys have a few options. I have purchased from them before without problems.

Luke

 

[Charles_nl]

I agree a setscrew is a terrible idea but run a chuck without a clamp and without incident. But it is only 125mm and my machine does not have a brake and I only power tap with collets. On a screw cutting lathe obviously the lock ring is critical and still I would be nervous with all those reversals. I am happy the 135 is a D mount

Luke

My 120VM did not have a brake either but the bigger danger was going accidentally into reverse.

Charles