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Issues parting off

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Bangkok Mick:

My tool tends to pull towards the chuck causing parting off to result in a concave on one side and a cone on the other. I have tried offsetting the tool in either direction and also tried tool upside down and lathe in revers with this issue still persisting in the same direction.

Can anyone shed some light on this problem?

Cheers Mick

DavidA:
All I can suggest is that either your tool isn't ground dead square or or it isn't square to the job,  or both.

But I suppose you have checked those.

You do have clearance on the tool flanks ?

Dave.

Meldonmech:

  I agree with Dave, make sure your tool is square to the lathe bed, by setting it against the face of the chuck. When grinding your tool, clamp a piece of hard wood to the tool rest of your grinder, set square to the face of the wheel. Then hold your tool against the wood when sharpening. Make sure the grinding wheel face is dressed square to its sides. Also check that your tool post is not turning during parting off. Let us know how you get on.

                                                            Good Luck  David

Bangkok Mick:
Hi Dave,

The tool is tapered towards the bottom to prevent it from grabbing, this is a standard pre shaped tool shape not my own design.

U do not understand the meaning of clearance on tool flanks, can you please explain.

Cheers Mick

Bangkok Mick:
Thanks David I will re look at my set up

Cheers Mick

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