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Lathe cutting tapers.

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Tony Pratt 119/02/2014 21:56:15
2319 forum posts
13 photos
Posted by mike T on 19/02/2014 21:08:51:

Mount a DTI in the toolpost and run it along the top or bottom of some ground bar held in the chuck.

Mike

Hi Mike,

What will that achieve?

Tony

Robert Dodds19/02/2014 23:23:30
324 forum posts
63 photos

Chris123,

You mentioned previously scraping the ways. Where and how much ?.Have you made any checks of the possible lift of the rear of the saddle due to clearance between the rear shear and the saddle retaining strip(it's not a gib strip as such)
Under cutting load if this clearance varies as you move along you can get the tool to push away from the workpiece by a variable amount and give a tapering effect.
one way to check with a dti is to use a suitable crow bar, with wood to protect your shears, to lift up the saddle against its weight and check for unusual clearances.

Bob D

Oompa Lumpa20/02/2014 11:02:38
888 forum posts
36 photos
Posted by Graham Meek on 20/02/2014 09:49:09:

We are told in the opening post that this has suddenly happened, any wear on the moving parts is going to develop much slower.

I would say the lathe needs "levelling", or to save a barrage from the ill-informed, "alignment" checks need carrying out, as my money is on ground movement due to the recent deluge.

Gray,

I would tend to agree with you, though I am not a civil or structural engineer.

These sort of sudden changes can also (I am not suggesting this is the case) be put down to the reversing of the fork truck into the machine and the paint marks from said bright yellow vehicle.

Not that I have any experience of this you understand.

graham.

colin hawes20/02/2014 13:12:32
570 forum posts
18 photos

I have used several lathes where the headstock is aligned by two setscrews and held down with bolts. If your lathe is of this type is it possible that the clamp bolts are not tight enough allowing the alignment setscrews to move? Colin

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