Peter -

There's two possibilities, and I can't tell foor sure which is the case
from your post. Either the pulley is moving on the shaft without the
screws loosening, or the screws are loosening allowing the puley to
move. It sounds like the latter.

Get some Loctite thread sealant. You want the penetrating type for use
after assembly. Clean all the oil off screws and out of hole. There's
a Loctite primer made for this purpose, Lacquer thinner will also work
with a little more effort. After screws and holes are both clean and
dry, reassemble and tighten good. Then apply a couple drops of Loctite
sealant where the screws go into the holes. A couple hour's wait should
do, but I suggest overnight. Should be no problem thereafter.

If the former, dimple the shaft or grind a small flat for the screw to
seat against.

Jim


Peter wrote:
I have a Record CL3 lathe that I have recently started using. I noticed
that it was getting rather rattly and discovered that of the two grub screws
supposed to be holding the spindle pulley in place one was not in situ. I
have since found it in the headstock and replaced it but the two screws
always work loose causing me great frustration at having to keep stopping to
tighten them up. Has anyone else experienced this problem and if so can they
suggest a solution. I have taken the shaft apart and can see no obvious
defects but did notice that there was quite a lot of oil on the shaft
(probably due to my over enthusiastic use of the oil can). Could this be
the problem?
Thanks in advance for any suggestions.
Peter