Those should make a nicely balanced ‘Team’

A very wise choice, I would think

MichaelG

That's a bit didactic. Not best modern practise perhaps but people have been using Dewhurst switches safely and successfully for the last 70 years. The contacts may get a bit pitted after half a century – a bit like putting a plug into an un-switched socket.

Anyway, nice lathe Dell. You'll enjoy that.

Rod

Very nice condition! I'd swap my S7 for that.

Nice looking lathe. Lets hope it performs as well as it looks. Nice find. As long as the lathe actually stops rotating before reversing there is no problem with a Dewhurst switch as it has a centre off position. The contacts are pretty meaty as well.

regards

I agree with needing a proper switch, I would add a no volt on off with an emergency button. A lot of Myfords came from the factory with just the reversing switch, my boss when I was an instrument mechanic bought a brand new Super 7 long bed and that only had the reversing switch. It was used as is and we knew no better at the time. The reversing switches are expensive and parts are not that easy to come by, that is a good reason to add a proper switch and only set the reversing switch when switched off.

https://www.axminstertools.com/kedu-kjd17b-nvr-switch-230v-1ph-102532?glCountry=GB&gclid=EAIaIQobChMI7fTagcaL_QIVycLtCh0Y7g1bEAQYBiABEgKMpPD_BwE

Edited By old mart on 10/02/2023 18:09:12

Anyone noticed the set true chuck?

Well done you

Welcome to the nuthouse, and have fun with your new pal

Looks very nice indeed, like it has hardly been used. The leadscrew dog clutch is a very handy feature that is sadly missing on the ML7s.

The trick to turning larger diameter jobs on these is to use a fixed steady on the larger job sticking out of the chuck.

My ML7 has only the reversing switch, which has been on there for decades unknown without contact problems. I will get around to fitting an NVR at the other end of the bench at some point. I have had it sitting under the bench for a couple of years now, just needs wiring in. Nice to have two options for stopping and starting.

With respect, 3 kW is not correct.

I suspect that the motor is 1/3 h.p. so it will draw 1 amp under load and up to 6 A briefly on starting. A Dewhurst switch will certainly cope with that.

I never had a problem with mine on an S7 so a slightly bigger motor.

The advantages of a separate NVR switch are (a) if the power is cut, the motor will not start up again unexpectedly when the power is restored; and (b) there is the option of an emergency stop mushroom button. However, it is certainly not a necessity.

It looks lovely – enjoy it!

Edited By Chris Pearson 1 on 11/02/2023 11:22:54

The Dewhurst tumbler reveRse did finally give up on my 55 year old Kerry lathe. However whatever switch you have will sooner or later give up on an inductive motor load. So after 50 years would you prefer to replace the Dewhurst or A N Other switch?

More importantly everyone is obsessed with NVR's – what about protecting the motor with a thermal trip of some sort as a fuse is not going to solve that particular problem.

Martin

Since you have a Dewhurst drum reverser then fit the equally old MEM contactor with overload, probably a 2A to 4A. unit and 220/240V coil. It is a NVR and gives one the option of remote swithching. With a screw on chuck how many people actually use the machine in reverse ? The old Dewhurst, IF used properly was bomb proof, only when used as an on /off switch did they eventually fail due to burnt out contacts, caused by the fact that the contacts do not snap open to reduce arcing..There are many firms who produce contactors with overload but you need one with the right current rating as shown on the motor plate and a 220/240v coil.

In answer to the question as to where is the switch, it will be on the wall socket, until such time as you fit a proper one on the machine. I assume that the machine has no clutch so stopping and starting the single phase motor, it will soon take a dim view of things, overheat and if your lucky drop the thermal trip – if the motor has one, or simply cook !

All the above aside you are a lucky fellow to have got such a nice machine. Best wishes, Noel.