Myford Super 7 - electrics/motor

That is why I fitted a TEFC (totally enclosed fan cooled) motor to my ML7. The most basic safety assesment would say "nein" to any motor that was not fully enclosed anywhere near a lathe.

That rubber mains lead really needs replacing. Use crimp ring tags on the replacement and make sure you leave the earth connection a bit longer than the live and neutral. This is so it does not get pulled off first if the cable is yanked. Even more important than usual as the terminal box does not seem to have any strain relief.

Robert.

Edited By Robert Atkinson 2 on 08/05/2023 13:44:29

Edited By Robert Atkinson 2 on 08/05/2023 13:45:03

Thank you all, really appreciate all of the informative posts. I didn’t know that I needed to invest in some wooden blocks too!

I agree with all the posts about wiring, not keen on the existing set up or worse, having to reach over the lathe to power off in any situation!

I think the question now is to make do once the wiring’s sorted, replace with a before single phase or go the whole hog and get a 3 phase. A potential never ending source of debate, but any views on which is the most sensible to learn on?

Thanks,

Chris

Makes no difference.

A 1/4 hp single phase n motor is powerful enoughm to injure myoun if you get invoved with whatever itb is driving.

But underpowered for a Myford 7 Series. As already said, a 3/4 hp single phase, or a 1/2 hp three phase.

In the hobby environment, three phase is likely to be fed from a VFD invertor drive.

With a screw on chuck, reversing bthem motor does risk unscrewing the chuck; but CAREFULLY done, can be used. NO heavy cuts, but best avoided. If for parting off in a rear toolpost,

DEFINITELY invert the tool to avoid the need for reverse running.!

Howard

Agreed. Single phase motors aren't awful, it's just that 3-phase are smoother, have more torque, and can be speed controlled.

Changing speed on a single-phase machine is a mild flap, requiring belts to be moved to get perhaps 3 fixed speeds. Fitting a VFD saves time by reducing the number of belt changes needed, and allows speed to be fine-tuned, which is moderately handy.

None of that matters when learning, and most Myfords have never had speed control. However, if the single-phase motor is bust, there's advantage in replacing it with 3-phase. All those who've done it seem pleased with the result.

Dave