RDG Myford Quick Change Tool Post

I have an RDG quick change tool holder - it arrived with the ML7R Tri lever lathe I bought. The tool holder is "alright" but I seem to have difficulty in setting the tool holder to height. Anyway I have learned to live with it for the time being.

I have just taken delivery of 3-jaw and 4-jaw chucks, both internally screwed for the Myford spindle.

The 3-jaw will mount on the mandrel only with diffiiculty and will not screw up to the shoulder. RDG say all their chucks are checked before dispatch and it must be the lathe spindle. But the two chucks that came with the lathe mount perfectly. The 3-jaw bears a label "Myford - made in Poland"; my only criticism being that the jaws and body are not numbered.

Has anyone else had problems with an RDG chuck? And can anyone make any suggestions as to how I might induce these chucks to screw easily onto the mandrel?

Many thanks for any help.

Richard.

Use engineers blue to see where it is binding. It can be just fractions of a thou that make a difference and it is better to be too tight than sloppy.

I had a pre-machined Boxford backplate from RDG that would not go on properly but went on backwards ok. Screwed it onto a separate screwed mandrel, the sort used for holding a chuck on a rotary table- thereafter it went on the lathe fine and snug. It was just the tips of the thread in that case that needed compacting.

ps You can mark hard things like jaws with dots using a 12v battery to make sparks off a needle.

Several of us made our own QC tool holders at the "College" evening class.We each obtain a length of steel, milled away the centre part will eventually become the part which will be clamped again the tool post. Next milled away either side with a "TEE" slot cutter copying a Myford bought one. Then cut the length up into individual pieces, then the tool slot was cut.Next all the blocks were drill and tapped in 4 places 2BA and 4 X 2BA allen screws were screwed in

I had a broken cast iron VEE block, it was slightly modified to become a triangle jig. This was then clamped to the milling machine table, such that each tool holders could be clamped to it at a 45 degree angle, using the previously milled slots, one at a time, using the four allen screws. Now the 4 angle faces could be milled.We each made about 8 in two hours, once we got set up. We used mild steel and up to date all have been Ok with no problem and that was four years ago. Incidently we organise our own evening class, we hire the College workshops.Ted

My thanks everyone who sent me advice. This afternoon I removed the jaws and discovered that the scroll and jaw slots were loaded with what appears to be muck/grinding 'stuff'. So I have given it a good clean and with difficulty got the chuck on. But it really isn't a patch on my Burnerd! Anyway, we are under way and my Sweet Pea now has some odds and ends that I have been promising her.

Richard