Peter, In a nutshell, the Quorn will do most things with the appropriate tooling. The Stent is a miniature Clarkson and provided the accessories are made- and the drawings only provide for centres and a simple tool holder, it needs something better and the Quorn one will fit admirably. Nice machine with less grit problems than the Quorn. The Worden is something that I built and scrapped. Grit retention proved a bastard but this has probably been improved. However, it will only do ends of mills in its present form. As far as I know, it will do drills now as well as the ordinary lathe tools etc. The Kennet is really for lathe tools and mill ends only. I have no doubt that it will do drills using the four facet method but I haven't tried on mine. Summing it up, it is a very nice machine with less grit problems and far simpler to set up than the Quorn.
Moving on--- sorry, Peter but you did set me a limit on words but I have to include other machines. MEW produced the Brooks and it is far simpler than the Quorn and requires only round and bar metal. It is driven(?) by a big router but replacing it with something else seems quite possible. Whilst Derek Brooks never fitted ends to do sides of mills and reamers, these do seem feasible. The tool holder is essentially ex Quorn.
There is a Tinker and MiniTinker- see the Guy Lautard site. It uses a DE grinder and the tool is therefore an accessory. I tried to build one but didn't get very far.Not me, I suppose.
Trying to keep as brief as possible in a very wide subject, John S and I came up independently with a DE grinder, a cheap s**te 3 way vice and milled the top off. JS fitted a proprietory collet holder(?ER) and I suggested a Quorn( type) one.
I doubt whether this can be precis-ed further without losing detail Yes?
Norm