Mike,

Slide your swarf guard over the barrel and fit a hose clip to the protruding barrel. Wind barrel back in to hold the guard. Bingo.

Brian

I made the same addition some years ago but don't remember how I held the ring for drilling (assuming it was done in situ).

I do, however, think your idea of centralising the ring with shim is a good one; I had to relieve my ring to stop it rubbing on the barrel.

PS

My copy of the Riley plan is for the power cross feed S7 although my own machine is the older, plain version. On the latter, the slots for the pins operated by the half nut lever are open-ended and I have taken J A Radford's advice to instal a ring around the outside to prevent swarf getting in.

I should be interested in seeing a photo of your leadscrew guard when installed.

Mike Donnerstag

Thanks for the photos. The new leadscrew guard is clearly doing a good job already; I assume the standard guard is removed.

From your photo it seems that the PXF machine's half nut lever does not need the protection I mentioned.

FYI, here is a photo of the tool I made to produce the felts for my Quorn grinder:

Perhaps not justified for a one off but you could make more and sell them to Hemingway!

Yes – a base, inner and outer ring; the outer ring looks as though I made it from a bit of scaffold tube.

The OD of the felt produced would be about 36mm; would this suit your job, by any chance? I could easily put a felt in the post.

I have no experience of the PXF machine. Presumably, the holes on the part in your photo are there to clear the screws associated with the gib strip and/or standard guard. Like you, I couldn't see this part in the manual (drawing LA) and I had some difficulty in visualising its orientation and function.

Edited By ega on 24/01/2020 15:35:18

Like this:

The two cutting surfaces need to be more or less level, of course.

Good idea to check lathes.co.uk – clearly, we both have out-of-date manuals!

Credit is due to Myfords for detail improvements over the life of the Seven. However, it looks as though the Riley approach is more effective.

So far as I can see they never directly addressed the problem caused by the redundant thread at the left hand end of the leadscrew; longer than necessary, it tends to transport chips back along the leadscrew.