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Hemingway Myford Tailstock Swarf Guard

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Mike Donnerstag20/01/2020 17:28:54
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187 forum posts
39 photos

I'm sure this is a beginner's question:

I recently purchased the Myford Swarf Guard kit from Hemingway Kits, as illustrated below. I turned the tailstock swarf guard having marked out the bolt circle before I bored the hole for the tailstock barrel. I was wondering how I should transfer these holes to the tailstock casting. I was hoping I could clamp the guard onto the tailstock in some way and drill through, though as the casting is irregular, I'm struggling to find a way to clamp it. Any ideas?

The other concern is that the guard's 1.125" hole needs to be roughly concentric to the 1.116" tailstock barrel to ensure it doesn't rub on the barrel, thereby defeating its purpose of protecting it from wear. Should I use shim stock (about 4.5thou) to centralise it to the barrel?

Hemingway Tailstock Swarf Guard

Any ideas gratefully accepted!

Mike

Edited By Mike Donnerstag on 20/01/2020 17:30:21

Brian Wood20/01/2020 18:21:54
2245 forum posts
37 photos

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

not done it yet20/01/2020 22:42:39
4889 forum posts
20 photos

Or wrap a few turns of sticky tape around the tailstock barrel? Remove it afterwards.

ega20/01/2020 23:19:51
1790 forum posts
153 photos

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.

Bandersnatch21/01/2020 01:09:35
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1716 forum posts
60 photos

Haven't really looked closely at this, but I'd:

- turn the hole in the guard to a close (but not interference) fit on the tailstock barrel.

- locate-drill-tap one mounting hole and install its screw.

- drill-tap remaining holes.

- then open up the hole in the guard if required.

(I hate messing around with shims).

 

Edited By Bandersnatch on 21/01/2020 01:10:32

Mike Donnerstag23/01/2020 12:09:38
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187 forum posts
39 photos

Great advice chaps - many thanks.

What is the best way to cut the 5mm felt neatly? Sharp wood chisel perhaps for the outer diameter? And maybe a inside-bevel gouge for the inside diameter? Can you tell I'm a woodworker at heart??

Mike

ega23/01/2020 13:38:37
1790 forum posts
153 photos
Posted by Mike Donnerstag on 23/01/2020 12:09:38:

Great advice chaps - many thanks.

What is the best way to cut the 5mm felt neatly? Sharp wood chisel perhaps for the outer diameter? And maybe a inside-bevel gouge for the inside diameter? Can you tell I'm a woodworker at heart??

Mike

Ideally, you would make up a simple press tool to cut the felt ring; no need for this to be hardened as it will get very little use.

ega24/01/2020 10:57:55
1790 forum posts
153 photos

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 Donnerstag24/01/2020 13:28:51
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187 forum posts
39 photos

Hi ega, I have posted photos of the two guards I've made so far below:

Leadscrew Swarf Guard 1

Leadscrew Swarf Guard 2

Tailstock Swarf Guard

ega24/01/2020 15:02:29
1790 forum posts
153 photos

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:

dscn1753.jpg

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

Mike Donnerstag24/01/2020 15:20:49
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187 forum posts
39 photos

ega: Yes, I removed the standard guard and the plate that protects the half-nuts (which I can't find any reference to in the manual so I'm wondering whether it was home-made. Having said that, it does look as if it has been stamped out:

Original half nut guard

I like your felt cutter and was wondering how to make such a thing. How did you make yours? I assume it's made in several pieces?

ega24/01/2020 15:34:55
1790 forum posts
153 photos

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

Mike Donnerstag24/01/2020 15:54:30
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187 forum posts
39 photos

How did you keep the inner and out ring concentric?

I made a ring from the felt, just using very sharp chisels and gouges, though it wasn't perfect and perhaps fits a little too tightly, but many thanks for the offer. For interest, I measured the size needed in mm: OD: 39.7mm, ID: 28.6mm

The part I photographed fits with the bent part upwards, covering the top of the apron above the half nuts, as in the photo on lathes.co.uk, which confirms that it must have been an original fitment:

myford s7 pxf from lathes.jpg

ega24/01/2020 17:34:50
1790 forum posts
153 photos

Like this:

dscn1754.jpg

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.

Mike Donnerstag02/02/2020 15:10:55
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187 forum posts
39 photos

That's brilliant ega. I'll try making one of those

Many thanks,

Mike

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