Parting off and general HSS tool sharpness

Gallery, Projects and General > How do I??

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Fergus OMore:
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Ross:
Thanks guys, by the sounds of it parting isn't that suitable for lathes as small as mine? But I'll adjust the gibs again anyway.

Besides, I can always hacksaw through then face to length.

I have a 7x14 Mn lathe.

Fergus OMore:
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Bert:
Hi Ross

Your little lathe is just fine for parting. The variable speed will help a lot.Your little beast is a great introduction to machine tools and a year from now you will be surprised at what you and that little lathe are capable of . You just have a lot to learn that’s all.
The internet is full of good information regarding your little lathe. Search, read and absorb.
You have received good advice so far.
In real estate the axiom is Location, Location, and Location.
In Parting it is ridged, ridged, ridged, sharp, sharp, and sharp.
“Read the chips.” is a term you will hear often and it is a skill you will develop over time. You will learn to hear what your lathe is telling you.
One thing that has not been touched on so far is the rate at which you feed in on the tool.
When you have a sharp tool, set at the correct height ,the aggressiveness with which can, and should feed may surprise you. Once you begin to cut and form nice chips you most likely can advance the tool at a faster than you may think.
Good luck and welcome to a great hobby.

Pete.:
Hi Ross.

Looking at the pic of your tool you have a shiny mark on the front which suggests the tool height was too high or that there is no front relief. Too high I would say.

For parting, I cut pieces out of a tungsten-tipped sawblade and mount them in my parting tool holder. If you have access to brazing or silver soldering you could easily make something similar for a 4-way toolpost.

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