BAZMAK-Diary of a Myford super 7b lathe restoration

bazmak · Oct 16, 2018

Well just a couple hours.Finished the tailstock and tweeked a few things as I think of them or as they surface.
Found the ideal position and bolted the lathe and the switch down.I then checked the h,stock and tailstock heights
I also set the tailstock alignment front to back.Turned a couple of diameters 13 thou taper over 200mm so adjusted
the bed twist using my patented riser feet. The first ones I made I drilled capstan holes for adjusting but on this pair
I only knurled them.For anyone who makes them they are far superior with the capstan holes.Also cut off about 40mm
from the rubber mat it does not as yet curl naturally but it does seem ok so far

goldstar31 · Oct 16, 2018

I seem to recall someone making a bed cover with a concertina thing of thin metal/plastic plates with rubber hinges.

How it all worked out in practice is unknown.

I've chucked it in with a view to more discussion.

My fading memory suggests that it was none other than Professor Dennis Chaddock so it would be a Myford/Drummond

Regards to all

Norman

bazmak · Oct 16, 2018

I have also thought of a concertina cover as used on the Chinese mills.But where to get one
I considered taking apart the spare cartridge fil;ter from my vacuum cleaner but that may be another day
At the moment the rubber sheeting is better than nothing or solid chip tray

goldstar31 · Oct 16, 2018

bazmak said:
I have also thought of a concertina cover as used on the Chinese mills.But where to get one
I considered taking apart the spare cartridge fil;ter from my vacuum cleaner but that may be another day
At the moment the rubber sheeting is better than nothing or solid chip tray

Barry

Actually, I saw how to do it on the 'net.

I think that it was all to do with bellows on cameras.

I'm in the midst( mist???) of doing charity audits and have moved from 'a morning suit' to a ' dickey bow tie job. to a stream of Finance and General Purposes meetings and then- would you believe?-being chaplain. It never ends but I'll have another go .

This Chaddock thing was like a pack of cards being shuffled but with cloth hinges.

Oh and the latest epistle is that I have an 'invite' to Tasmania via Oz and -- it's all rather posh - and I want a stopover at HK- for some junk food.

Who said old age is boring?

Norm

goldstar31 · Oct 16, 2018

And I sort of Googled and found a video of How to Make a Leadscrew Cover for a Sherline Mill

I never thought that I'd be into 'Oregano ' but this my friend, seem to be one clue. The Buzz words are 'bellows' and 'Concertina'

Oh and I must go.

Aide Memoire--------Norm-- the decanter of port goes clockwise around the table!
N

BaronJ · Oct 16, 2018

Hi Guys,

You can see the magnets clearly now, and how supple and flexible the silicon sheet is.

As the saddle moves forward the silicon sheet just falls into the gap in the bed, right under the chuck. Also this sheet is now an inch shorter. It also flops nicely over the lead screw.

Someone asked, I don't recall, but that is my Norman Tool Post ! I should have made one years ago, beats prating about with shims and the like.

goldstar31 · Oct 16, 2018

Thanks John! I have this on my Warco mill drill but with two steel edges bolted etc.
However, the rubber has sort of gained a 'Shore Hardness' almost ready to separate.

I have some rubber membrane which was left over when my new shed was weatherproofed.

And 'No' to a Norman tool holder

I'm looking for a new wallet spanner? Any suggestions, welcome

N

BaronJ · Oct 16, 2018

Hi Norman,

I got my silicon baking sheet from one of those £ stores quite some time ago. I keep looking on the Chinese web sites for some more without much luck.

If I spot any I'll shout.

Can't help with the spanner I'm afraid. The Grand kids, keep letting the moths out of mine

bazmak · Oct 16, 2018

Thanks for all the input guys

bazmak · Oct 22, 2018

Thought I would try the gearbox and do some screwcutting.While restoring the 3 no Ml7s I had problems with missing or lost bolts
BSF of course and not easily/cheaply available in my neck of the woods,so I decided to make some allthread
I finished with a foot of 1/4 26tpi, 5/16 22tpi and 3/8 20tpi bsf of course.I started with the 1/4 and had a few problems
with the job springing (o for steady eh Norm) so got it near and finished with a die.Getting the knack of single point cutting
(I missed the thread dial line a couple of times) but by the time I finished the 3/8 there was no need to use a die.O bliss Myford
compared to the Chinese vari speed.Low speed,plenty of torque and a gearbox..Now I have to clean down the lathe
I removed the rubber mat for this job as it became a problem with the length of feed meaning I had to keep starting its roll everytime
Will try to improve and overcome the problems as they surface

goldstar31 · Oct 22, 2018

Hi Barry

I'm forgetting but with a 8TPl leadscrew do you really need 'hit' the 'same' division on the dial indicator for even number threads?

Again, I was talking to Neil Hemingway years ago about my Pools Major lathe and not being able to get a steady. He said 'make' a wood one and this was confirmed by Leonard Sparey in his Amateurs Lathe book.

Thinking in terms of screwcutting yet again, Martin Cleeve made something called a 'Fixed Bushing Steady' using a miscellany of bushes dead to size. What is worth recalling is that he wrote Screwcutting in the Lathe and on being made redundant from his proper job made special nuts and bolts on his very modified ML7. Somewhere in Model Engineer he wrote up how to make socket screws.

So he made a special fast screwcutting device but this has been vastly improved in a more recent book by Graham Meeks. I borrowed it from an old mate in his 90's. Certainly worth a read.

Me? I'm getting very blind now but trying to soldier on regardless

Best Wishes

Norm

bazmak · Oct 22, 2018

I once had a job putting an M6 thread on 6mm dia bar at weekends in my shed for my boss at work
Price per each one.I could not afford a Coventry die box so made and set up a die holder in the toolpost
First tried just letting it pull itself on but set the carriage to the correct feed and screw cut them that way
Main problem was it took a fine cut on the reverse off.Finished with poor quality threads but they were not
important so got awy with it.Went thru quite a few cs dies before I started using hss

BaronJ · Oct 23, 2018

Hi Barry,

I have an 1/2" inch Coventry die box, I bought a lifetime ago, I only ever used it once, its sat in a box somewhere ! I thought wow the answer to all threading problems... No a very expensive mistake !
One, I couldn't afford to buy the dies for it, two, its a bit heavy for the Myford, three, it is the one that is intended to go into a 1" inch socket on a turret lathe.

Ah the impetuousness of youth.

redhunter350 · Oct 25, 2018

Hi Baron, use mine quite a bit on a Super 7 here's a pic with the mounting adaptor No 2 morse, yes the dies are expensive but if you have a large batch to do its worth it, however the often come up on flee bay but you need to mack sure they are good.
John

BaronJ · Oct 25, 2018

Hi John, thanks for your reply.

It never occurred to me to make an adaptor to fit the tail stock !
The one and only time I used it, I clamped it in the three jaw, unscrewed the handle and put the workpiece in the Jacobs chuck in the tail stock. It was supplied with the set of dies I asked for, but when I discovered the price of them, a new round die was only a fraction of the price.

In all honesty, I don't remember where it actually is now, other than its in one of the many boxes of stuff that I really ought to go through and start throwing stuff out.

bazmak · Oct 25, 2018

Thanks for the info on the leadscrew dial Norm.I had forgotten what the rules were so played safe and hit the same no
Then googled it and remembered that anywhere for threads divisable x 4 and any no for even threads.It only gets complicated
with half or 1/4 threads.Will stick with 4 nos and use the low speeds for short lengths.Because I had a long length and run out
I cut at about 200 rpm to save time ,it was too fast and made catching the line difficult,but I was impatient.Should have cut at 100 or less
All trial and error.Its much easier with the gearbox and a die to finish off

goldstar31 · Oct 25, 2018

Barry and John B

Glad to like and comment. I still have a tailstock dieholder which takes TWO sets of die-ameters

Actually mine is so old that it No1 Morse and sleeved to make it a No2.
Again, there is such a things as a 'handel for a mandrel'. Mine was more or less George Thomas Model Engineer Workshop Manual but if you can fiddle a bit with Google there is an old- part left article by Chris Heapy. It has a a set of Myford things including his version of a 'mandrill handill' and lathe bed stops and, if U recall, a taper turning attachment.

I need a 'mangle handle' for the Sieg--- a round tooit.

Best wishes

N

bazmak · Oct 26, 2018

I made one for the sieg using a sleeved expansion anchor

goldstar31 · Oct 26, 2018

bazmak said:
I made one for the sieg using a sleeved expansion anchor

Sounds as if a M12 would modify

Thanks

N

Hopper · Oct 26, 2018

I use vinyl cut from an old handbag as a "bib" on the front of the carriage on my ancient Drummond to keep chips off the ways. Works very well. Very hot chips do tend to stick to it and burn little divots into it so I like the silicone idea.

BAZMAK-Diary of a Myford super 7b lathe restoration

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