Myford super7 motor U/S

[EmgeeParticipant @emgee]

see this earlier post, it has a drawing of motor plate connections for various makes and details of connecting the Dewhurst switch, everything you need to get the reverse working, but as said don't forget the chuck is screwed on.

http://www.model-engineer.co.uk/forums/postings.asp?th=109998

Emgee

[Kevan ShawParticipant @kevanshaw32462]

Here is a connection diagram I found and used to sort my lathe out

the connection labels might not be the same as your motor. By the way what make is your motor? Mine is an SEM and this is the connection box as it was when I started.

[Kevan ShawParticipant @kevanshaw32462]

I had to add another post to make enough connection points for the Dewhurst

Edited By Kevan Shaw on 13/09/2020 09:57:38

Edited By Kevan Shaw on 13/09/2020 10:01:53

[OldironParticipant @oldiron]

Posted by c wastell on 13/09/2020 06:28:00:

Thanks for that further information, chaps. I wonder if I have got all the connections right, in that case. I don't have wiring diagram.

Steve, Screw cutting is the reason for wanting reverse but its not the end of the world.

I use reverse on my Boxford when cutting metric threads and do not want to disengage the lead screw. Been doing it for years and never had a problem. Just slow it down with the VFD in reverse. I do have 2 chucks with grub screws in the hub of the backplate to lock them to the spindle also.

regards

[c wastellParticipant @cwastell25217]

Thats all good gen. Many thanks. None of the motors shown is exactly like mine (which is matching grey! and looks original) but the diagrams make some sense to me. However I suddenly have a more pressing problem in that the resilient mounts have given up the ghost completely. I found a thread on here from 2013 but wonder if, since then, there is a supplier of these? How important is it that the motor has this flex?

[Kevan ShawParticipant @kevanshaw32462]

I would definitely replace the mounts with something resilient otherwise you will transfer a lot of vibration to the machine along with more noise. Resilient mounts are very common so can be got from a variety of sources. Modt likely local source is a friendly car parts supplier as they are used all over modern cars. Take one of the failed ones along and see if the can find something that looks and feels the same. Exhaust system mounts are a good place to start looking. Otherwise if you have a good local engineering supplies place they should be able to help.

having said that my motor is just bolted straight to the motor mount plate and runs quite smoothly. I haven’t noticed if the hinge between the motor mount plate and the lathe bed has any resilience.

[SteviegtrParticipant @steviegtr]

Same here Super 7. 3ph motor directly bolted to frame. No vibration.

Steve.

[Author]

Posts