I've had that same issue, your lathe is fine . . . Your part is climbing up your tool. The part is getting less and less ridged and the insert less sharp. Your taking a bug cut even if not deep because of the surface contact of that big insert. As the part climbs its digging into the left side, the tool is aligned but the part isn't. Clock your insert to a fresh face when you're close to depth. Let part cool well and keep it cool. Use coolant or at least oil. I was told use a follow rest but I find they are more trouble than help. Don't give up on that lathe, stick-stay and make it pay . . . Except the challenge.

It’s not the lathe kid. U got to comfortable after your coffee you didn’t wait for the number to come up. And it drug on you.

We will use cutting oil on boring .060 with high speed steel but cut acme threads dry???shoulder Shrug!!

Cutting oil?

Thank you! Great informative video !

i learnd alot thank u

lead screw badly worn

Hi Adam again I'm watching that's what happens sometimes with carbide versus high speed Steel. One thing you can do is put the tool slightly above Center, that'll keep the shaft from climbing up. A thread like that I've always used high speed Steel with arcs on the top of the flanks for chip flow. Also you're probably didn't use coolant or cutting oil for the video but that would help you greatly also

Hi Adam I noticed when you were threading an Acme using the Monarch lathe, it looks like that has automatic reversing for threading why didn't you use it ?

I think using a travelling steady, and a good quality cutting oil. Ian.

So I've been watching machining videos for months now, and no one ever showed how to get the tool to start a new pass in the same spot when cutting threads. Thanks for showing that!

Одновременно с заглублением резца в деталь, полезно смещать его еще и вбок, чтобы резец резал только одной стороной - это уменьшит усилие резания.

i´m a newbee, so i would try a drop of cutting oil

The only issue i can see is that you parallel corectly the big vertical support but you get in the thred witht moving in the tool holder that is NOT to zero😂😂😂😂😂

Relieve your cutter on the leading edge more. I think that would help. It appears to have a rub mark on that surface.

Awsome job to me im new but like all the explainations. fisrt time on your site. will be back...

Are you sure your tool is centered on the material a lot of times if it's not centered it can do that

Anyone know what quick change tool post he used on the first lathe (victor lathe)?

If you give up on the monarch let me know, I’d love to have it!

Good to see someone tighten more than one pinion on their chucks, amazing how many people just do the one.