Harrison M250

Hi all, Newbie here and hopefully I'm in the right area. I've just got hold of a Harrison M250 which was dropped off a pallet and part number 904037 (from the Harrison manual snapped) Its got a ball joint and hex on it, so not easy to make without CNC lathe and miller. I've tried looking around, but as someone new to this I cant find anything. Any suggestions welcome and many thanks if you can.

Can you post a picture of your broken bits?

Have you tried Colchester spares ?

regards

Ty Googling 'ball stud bolt' if you can't find a proper replacement.

Welcome to the forum. With a picture we may see other ways to make things, good luck.

To assist the OP and those with suggestions, the broken part is shown in this parts diagram it is part of the feed selector mechanism., given the relevant dimensions, thread etc, a straight forward part to make for someone with a working lathe although it may require hardening

It took me a few minutes to work out how to post the image. Thanks for the many replies. I'll try the Colchester route and Googling the ball stud bolt option.

It would not be hard to make on your machine even without the feeds working. Take a bit of hex stock, turn down one end and then thread. Make a female threaded arbor to screw the part into and rough out the other end by turning then the ball can be cut with a homemade form tool or even use of the file against the rotating roughed out ball.

There is a harrison lathe user group

https://groups.io/g/HarrisonLathe/topics

I don't use it but do use the Boxford version and whilst you may need to wait a while for a responce, usually someone with specialist knowledge will come along and help in due course. If there is a source for spares, I suspect someone there will be able to tell you where to find it.

Assuming it does not take any torque in use, just repair what you have. The difficult bits for which you think you need CNC are already there.

Drill and thread the hex part for at a size one or two less than the main stud (e.g if it is M8, tap it M6 or M5) and make up a shouldered threaded stud to go into that thread. Secure with loctite.

With care and a little thought, you do not even need a lathe - could be done in a drill press.

Anyone know if one from an M300 would fit?

Hi Malcolm,

How about in line ball joints.

https://www.aetnascrew.com/ball-joints.html

Dismantle to get diameter and size required.

Nimble Neil.