[Project 2] Machinist Jacks

First project I get to choose (after being forced to make a part for the screwcutting gearbox).

Outside thread for the top (jacking) part (m30 x 2mm):

Inside thread for the bottom part:

Finished article:

Nice one. Some jacks have been on my list for a while now , I will get round to it.

Hi Lee,

I'll bet you didn't single point that internal thread

Cheating I know but this seems to me to be the best approach.

That's what I tend to do just grab a couple of nuts and a stud from the hold down set.

Lee with all your vibration problems you may want to add a locknut

Well my tap & die set tops out at M24, so I guess I did.

Cheeky! I'm trying to get to the bottom of those.

And yes, totally cheating (and would void the point of the project).

Good for you ! I hoped that you had. Its not an easy skill internal threading, particularly small or deep bores. Although I admit that I could have cheated and used a tap, the amount of effort required to turn a large tap of that size is enormous. I've only ever used that tap once, never again.

Lee,

Wow. You certainly don’t do things by halves! They are generally supports - not used for jacking up the leaning tower of Pisa! I’m surprised you didn’t put a hole through the top, for a tommy bar.🙂

Good work, mind. Easier to practise on a larger internal thread.

A tommy bar, now there's an idea! Wait for v2.