I had a 12" lathe that I bought brand new years ago, and I could never part off without chatter. One day I decided to check the preload on the tapered roller spindle bearings. They were not set tight enough from the factory. After adjusting the preload nut, the machine would part off like cutting through butter. What you said pretty well covers all the problems, but I thought I would add that one as well. Thanks from the USA. We love ya, buddy!

John can you do a milling machine tutorial after you finish the lathe series.?

I've been watching you piss about for about ten years now John. I've learned a good deal in that time. Best wishes, Dean.

John, I do very much the same as you do for parting off ops with one difference in that i gave up trying to get cutting lube into the deepening parting groove with a small brush. Instead of the brush I now use a small bellows type squeezy plastic bottle fitted with a canula type hypodermic syringe needle on the neck and filled with cutting oil. This bottle set up makes it real easy to get the cutting oil exactly where it needs to be throughout the whole cut.

I used to dread parting off until I bought one of the parting tools you recommended. Now I find it easy. Auto feed and plenty of soluble cutting fluid or wd40 on aluminium.

Thanks for sharing your skill and knowledge. No matter how long a person does this I find that there is always something to be reminded of something new to be learned. I would like to add the the position of the cutting tool in relation to the forward edge of the cross slide should be as short as possible. So if the compound has the cutting tool extended in relation to the forward edge of the cross slide then retract the compound so the the cutting tool is as close to the edge of the cross slide. I have a HF mini lathe and this one thing has helped me to part off stock much easier. I have locked up the lathe when parting because the cutting blade deflected too much because the compound was extended too much. Again, thanks for sharing!

Thanks John. I enjoy watching you piss about. I do a lot of that myself. Keep it up!!

Very useful guide, this is something I've struggled with in the past, thank you. I particularly enjoyed the subtitles :)

Good sound advice, you do what it says on the tin.

Great video. I have been struggling with my parting tool. Now I know better Thank You John.

Thanks for the instructions.

Very useful info John, many thanks.

Pissin'' about not too bad . That's going in my little notebook of technical terms , just after piss wobbly slack.

Thanks John

Man thanks for the tips.

Excellent information John, keep'um coming..

Thanks John fanbloodytastic 👍👨🏻‍🏭

Thanks

First time I've seen your Video , so l don't know what Brand of Lathe ! You have !

How can I thread in reverse (cutting away from the chuck)with a "screw on chuck and spindle " on my South Bend lathe?

Awesome. Regarding speeds is there any official calculation to work it out for Parting off. You mentioned 300 rpm even for carbide so I think I've been running mine too fast.

I use the parting of tool upside down on the other side of the cross slide, This is how they were used on capstan lathes when I was an apprentice. The advantage is that it is on a single toolpost which is more ridgid than the compound and tool holder. The weight of the chuck adds to the cutting force so both force the work peice down onto the bed. A bonus is that it free's a tool position on my rotating tool holder.

fast speed slow feed 002"

I’d also suggest:- reduce chatter, lock ways on the main carriage & top slide. - that the cutting tool is wider at the cutting edge narrow to the back to reduce side friction. Check out “blondihacks”for lathe and milling basics instruction.