Welcome to ModelEngineMaker !If you have problems registering or logging in, please use the contact menu option to request assistance.
The little Sherline 4 jaw self centering is a rarity as it comes with the soft jaws, the slightly larger one comes with hard jaws. (I do like 4 jaw self centering chucks )Simon you might want to keep your eyes out at the shows for a chuck for your table I picked up a brand new P&B 4" 4 jaw independant that had a boxford back plate on it for £60 from one of the more expensive second had tool dealers. The fact that it was a 4" meant that no one wanted it for a lathe but it is ideal for my Elliot indexing head or for mounting on a rotary table and it is nice and thin, much thinner than my TOS chucks of a similair size. The smaller P&B 4 jaw independants fitted to both Cowells are also very nice . I don't know about the quality of the latest version of 4 jaws that come with Unimats. Jo
Physically the older machine has the coarse 1.5mm by 14mm thread and the later one has the 1mm thread. What this means is you can buy cheaper accessories to fit other lathes that will also fit the later machine. But you get what you pay for.. I have a few Unimat 3 chucks and they are not a patch on the Bison/Prat & B ones that came with the two Cowells.