Faceplate was the cause

[John Stevenson 1Participant @johnstevenson1]

Well I have read all the replies and whilst most advise is good I would attack this from a different angle.

 

First of this machine regardless of it's paint job, is, at the least 67 years old and no one has no way of knowing what it's been through.

 

Without getting into an argument on the register to thread debate what is critical is the register FACE on the spindle.

If that isn't true then nothing that screws on it will be. Now you can sit there with a clock all day long checking but the only true way is to take the smallest lick off the face whilst it's running under power in it's own bearings.

 

Do I hear sound of heretic, sacrilege etc ? Long , short is it was true 67 years ago but we don't know about today and we are not talking about taking 1/2" off.

Now it's no good getting the spindle true only for the backplate to sit on wonky so the chuck needs taking off the backplate and the backplate screwing on the wrong way round to the end, not tight though.

Then back off one full turn approx, not critical. the distance between the register face and the face of the backplate at this point is the length you need for a spacer, spacer can be anything doesn't have to be a good fit on the spindle thread, in fact it want to be loose, could be a bit of steam pipe.

 

What does matter is the faces need to be parallel. Becky cannot make this because of the wobble, needs making on a decent lathe or even surface grinding, but once made and fitted between the spindle register and the front of the backplate the register face on the backplate can be machined and a chamfer put in the bore on  the edge.

 

Now and only now can it be turned round and the facing operation previously described be carried out.

 

It's pure logic when you think about it

Edited By John Stevenson on 03/02/2014 21:38:48

[Howard LewisParticipant @howardlewis46836]

If Becky can find (Borrow? But keep swarf out of it!) a Ball Race (or even the inner track of a Taper Roller Bearing), of the right size, in good, or preferably new, condition, this would probably be a splendid spacer?

Howard

[Carl Wilson 4Participant @carlwilson4]

Taking the logic further, does a skim need to be taken from the mating face on the spindle?

[John Stevenson 1Participant @johnstevenson1]

4th paragraph, that is the first operation.

[Carl Wilson 4Participant @carlwilson4]

There it is!

[rebekah andersonParticipant @rebekahanderson95322]

thank you every one.

there is plenty to go one here.

once I have bought a new back plate I will apply all the suggestions that are applicable.

I have posted another question but this time on milling machines on another thread.

cheers

becky

[Brian WoodParticipant @brianwood45127]

Hello Rebekah

I have commented before on your nice looking lathe. Before my present machinery I inherited my father's ML4 which he bought new in 1945

That had a 1 1/8" diameter plain spindle section and 12 tpi 1 1/8" Whit form thread on the nose for fitting on chucks etc. Knowing the rear vertical face to which chuck backplates etc could be screwed to a stop was true, as John Stephenson has described a perfectly valid correction if it is needed in detail, I modified the nose with a close fitting collar that I loctited to the plain section behind the nose thread.

With some careful reaching with long tools, it was then possible to turn a new diameter of 1 1/4" as a location diameter for the more up to date ML7 chucks, faceplates etc.

I seem to remember telling you about this dodge in our previous exchanges, it is well worth the little effort involved.

Brian

[rebekah andersonParticipant @rebekahanderson95322]

hiya all,

success, I destroyed two plates in the process but I now have a chuck mounted on my lathe.

now just need the tumbler gears (tufnol)

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