Gallery, Projects and General > Oooops!

Myford M type safety warning (Dewhurst switch)

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Pete W.:
Hi there, Eugene,

The Dupar switch is four-pole so you should have at least one set of contacts spare.  I haven't dug out my circuit diagrams yet (my breakfast cuppa tea is demanding my attention) but you should be able to wire that contact set so that the NVR drops out when the Dupar passes through the 'off' position. 

That way you'll avoid any  :zap:   :zap:   :zap:   :zap:  I just had to get that one in!!   :lol: 

Eugene:
Still puzzled!

Eug

lordedmond:
Eugene
Why did you buy that NVR and not the one with the forward and reverse switch built into the unit itself

Dump the dewhurst they are no longer serviceable , no spares are around and bring the M into the 21 century and be sure that you are safe under all circumstances

A thought crossed my mind how often do you use reverse , not at all is my guess , so why not dump that dewhurst and use the NVR you have as a start stop and be done with it

I have had a series of Myfords over the years and I cannot remember when I made it go backwards
Current is a connie
But it's down to you those switches are dangerouse as a misplaced elbow can start up the lathe the position that is factory is very bad
Be safe and count your fingers after using power tools

Stuart

Meldonmech:
 
     Hi Eugine
                            I have the same switch from Axminster fitted to most of my machines, and they have been trouble free for   years.
    I often use the reverse on my lathes when screw cutting, as I do find it easier and more trouble free than other methods.

                                                                      Cheers David

awemawson:
I've never used a Myford for screw cutting (or for anything else for that matter!) but on my Colchester, the electrical reverse lever that traverses with the carriage, and the full width foot brake, are essentials when metric screw cutting. The nut stays engaged, a cut is taken by pressing the lever down and stopped by jamming on the foot brake as I withdraw the tool, which is then traversed to the start by pulling the centre biased lever upwards.

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