Evaluating & Correcting Wear in an ML7

[Dr_GMJNParticipant @dr_gmjn]

 

Got the saddle rebuilt and fitted today. I thought I'd document it just in case anyone was going to try it.

I spotted a potential issue with the locking mechanism – my feeler strip was pretty much size for size in terms of depth, and I wanted to make sure that when the locking block was pulled up it didn't crimp and distort the strip, so I dremelled and polished a slight recess in its top edge:

This is everything fitted:

As per my other "gib strip" thread, I drilled the new Myford item using a transfer punch through the saddle holes to get things aligned, then de-burred and polished. I also used the locking method proposed on the other thread – cross drilling the screws and inserting Nylon strimmer fillament to form a self-locking pin, obviating the need for lock nuts. I also polished the hemispherical ends of the gib pins:

And fitted the new wide guide felt and retainer. The front vertical retainer needed a layer of shim peeling off each side to eliminate some slight play there.

All seems to work very nicely now. I also did the faceplate test, a video of which I'll post here in a bit.

Edited By Dr_GMJN on 01/11/2020 20:14:57

[Dr_GMJNParticipant @dr_gmjn]

I did the faceplate test using Hopper’s article method. I’ve got two Myford faceplates. Measuring face runout, one isn’t too bad, the other’s like a farmer’s welly. I took the good one, and got 0.002” runout on the face. I put this at 12 o’clock and ran the DTI over it with the cross-slide. Click on the image a couple of times and it should play the video:

So a bit of movement, but didn’t seem too bad? I tried it with the faceplate rotated to a couple of other positions and got similar results.

Full disclosure – I also tried it with a parallel in a 4-jaw, and got 0.001” o/d to centre. The plunger was going towards the chuck winding from o/d to centre. I think this means I’d be machining convex, which is bad. Not sure which to believe. Then again it never occurred to me to ever check this before, and the 10V turned out fine, so perhaps ignorance is bliss? Cheers!

[Dr_GMJNParticipant @dr_gmjn]

Posted by peak4 on 31/10/2020 01:47:37:

Nice one, it's looking quite good at that.
I'll get around to doing mine at some point, but obviously using the tape, as I have it in stock.
Currently making a batch of arbors for the grinder at the moment.

Re your comment on oils.
Don't know if you're aware, but Pennine Lubricants are reasonably priced for slideway, and hydraulic oils, (and also for cutting oils in their Metalwork section).
I'm using their neat synthetic cutting oil in my larger Warco GH1330 as well as their slideway oil on all my lathes.
The Nuto equivalent hydraulic oil on the other Myford bits, and a soluble oil in an old hand sprayer for the power hacksaws and grinder.
They are at the top end of the old Batchelors pea factory off Claywheels Lane.

Bill

Bill,

FYI Pennine have now moved from Claywheels Lane to Newhall.

[brian jones 11Participant @brianjones11]

Hi Hopper

just read your posts on Myford wear

unfortunately i cant buy copies of your articles on line as suggested – other than by signing up toa suspicious monthly subscription

its a pity MEW doesnt run and market their own scheme, get some bright young kid to compile all the wisdom articles and sell download copies

most people only want article of particular interest and not the 90% advert junk that goes with a hard copy

pity to see such valuable insight go hidden under ground

you cant publish you stuff on here cos of copyright

[JasonBModerator @jasonb]

Posted by brian jones 11 on 20/07/2021 22:29:02:

unfortunately i cant buy copies of your articles on line as suggested – other than by signing up toa suspicious monthly subscription

 

its a pity MEW doesnt run and market their own scheme, get some bright young kid to compile all the wisdom articles and sell download copies

You can. Pocketmags is the online viewer that MTM (publisher of MEW etc) use and digital back issues are available back to 2012 which I think should include Hoppers article. Click here

Edited By JasonB on 21/07/2021 08:11:00

[brian jones 11Participant @brianjones11]

Finally the answer, well hidden by Google which only shows you what it want you to see

Perhaps JB you could make this a sticky so unfortunate members like me dont have to struggle for hours of frustration just to get a digital download of a MEW back number whilst being bombarded with sites pushing their subscription model

Do us all a favour here and MEW

ive ordered all 3 articles 285, 287,289 £15 well worth it for a mysterious subject mostly hidden from mortal eyes

how many users take the saddles of their Madam Myfords?

thnx 10^6

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