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myford super 7 mk1

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Cabeng15/09/2011 00:42:38
86 forum posts
59 photos
Des:
 
Another possibility is that the pulley has broken loose from its inner bronze bush. I know of two machines where this turned out to be the reason for the pulley rotating without driving the spindle.
 
Not a disaster, after dismantling just loctite the bush back in place, re-assemble, adjust the spindle as already mentioned, and it's fixed.
Desmond Farthing15/09/2011 12:14:40
6 forum posts
Hello Nobby and Clive. Thank you both for your helpful replies.
No Nobby I wasn't at the time using back gear. The information on the C spanner was unclear, but I think it meant one of 1 1/2 diameter. I shall get/make one. I shall disassemble the headstock and look for a broken woodruff key, and also also follow Clive's advice about the Hex locking locking bolt, and details on the pulley.
Once again thank you both for you prompt replies to my request.
Des
 
Nobby15/09/2011 16:32:49
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587 forum posts
113 photos
hi Des
I think this may help .I just ran down and took this photo.To set bronze bearing tighten
until spindle is tight/locked Them come back a 1/4" .Please see c spanner Is that the right word? As you may know that is a split collar at the front tighten with allen key
Nobby
Nobby15/09/2011 17:01:08
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587 forum posts
113 photos
Hi Des & Guys

That split threaded adjusting collar (4) is for loading the back 2 ball bearings Don't overload these as it will cause excessive wear Do this first tighten allen screw (3) Then load front bearing as I said before.

Nobby

Desmond Farthing23/09/2011 17:44:08
6 forum posts
Hello Nobby & Clive. Good news, I stripped down the headstock of the Super 7, after studying a borrowed Myford S/7 manual, and the article by "Richmond" in MEW issue no. 139. This was quite straightforward, although I mistakenly removed adjusting rings (Items 14, 2 off) which retain the ballraces in place, instead of just loosening them, which caused a bit of a problem in assembly . On inspection the spindle surface and the mating phosphor bronze bearing were in extremely good condition. Quite rewarding on a machine on the wrong side of 50 years old. The first attempt at assembly was a failure, I just could not get the spindle to mate up sufficiently tight in the P/B bearing. After carefully realigning the ball races I started again, with a bit of horizontal pressure on the spindle as the R/H adjusting ring was tightened, this succeeded. With hindsight the procedure was not difficult, but there were slight problems to overcome. With the Cone Pulley Assembly and the 60 tooth Back gear held together, not forgetting to put the drive belt in place! there is little room for manoeuvre in the headstock casting, bearing in mind the location of the woodruff key fitted in the spindle, which must be persuaded into the matching keyway in the back gear.
The distance between the back gear and the casting is about 1/8 ins.and, and as the spindle is pushed into the P/B bearing, eventually the woodruff key can be seen, and after a bit of fiddling enters the keyway. In a way it was an enjoyable if not frustrating exercise. and I have learned a lot about the headstock workings. I feel confident that I could repeat the exercise without reference to the manual. I have now a copy of it in A4 size which is excellent, containing details of the early ML7, which mine is. It cost £6.75 inc. postage on E-Bay, well worth it. I did not find the cause of the fault, and can only assume that it may have jumped out of drive when the chuck key struck the bed, and I never bothered to check it. Whatever the cause, the experience was useful.
 
 
Desmond Farthing23/09/2011 17:49:04
6 forum posts
Hello Nobby & Clive.
Correction to my last message. 4 lines from the end it should read MLSuper 7.
Regards,
Des
Nobby24/09/2011 15:21:45
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587 forum posts
113 photos
Hi Des

Good news its what this game is all about I learn something new every day

. I worked at a place that supplied bearings. I went back to see the guy & he said if I done the post like I used to for the day. He gave me a matched pair of the back bearings for My S7 Mk1 .I'm in the process of making a new nut for the x slide on my Drummond flat lathe But having problems. You may have seen on this on recent forums I cant use the Myford as the x slide spindle is stripped down.

Regards Nobby

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