Another dirty Brian trick - reversing the chuck

Oh my word, we've failed to genuflect in the presence of genius.

The OP isn't the first new member to start by mouthing off about the stupidity of other forum members, and I don't suppose he'll be the last. Experience indicates that they normally calm down, or quickly disappear.

Andrew

This sounds interesting Mart. Can I take the idle approach and ask you where the thread is to be found? (The alternative is to search for it, which might take me for ever.)

As for the matter of reversing the motor, I use an 'intermediate' light switch which cost a couple of pounds from an electrical wholesaler. It's rated at 10A and is never switched while the motor is running. Well, it was once by my carelessness, but the motor didn't even notice.

George B.

Well done george, my point entirely. I think 10 A is a bit tight as the start current is likely 16A momentarily, I use a 20A DPDT 3 way (centre off) toggle switch. Its only meant for dead ccts use. It is NOT a cct breaker. Your m/c wouldnt notice the difference when you accidentally switched the c/o while running because the motor centrifugal switch would have disconnected the start winding. However I strongly advise against such fooling around. After all you would drive your automatic car at 70mph and then throw it in reverse. Clowns do it and ruptured gearboxes dramatically

I cannot find the thread, but if you can access my album, the basic pictures are from the 3rd to the 8th.

You clearly don't know much about starters, DOL is "direct on line" and refers to any starter regardless of voltage or number of phases connected via a coil controlled contactor.

Emgee

Edited By Emgee on 28/06/2021 20:29:29

You no doubt refer to the MEM Startlet which was not a DOL starter as it had no coil fitted, it was only a mechanical switch with a current related adjustable overload feature that tripped the switch OFF.

That was not what I was referring to in my earlier comment as explained above.

DOL starters were the next stage of progress with motor control and are still used widely in industry, not all motor installations benefit from soft start or speed control as given by other types of control.

Emgee

Brian

Why would a 2.5mm T&E radial cct be a fire hazard if connected to a 16A mcb ?

Because it doesn't comply with regulations does not make it a fire hazard.

Emgee

Back again, the thread was from 20-6-2019 in manual machine tools, "my version of a locking device for threaded spindles" There were no replies on this forum, but I had also posted on The home shop Machinist in the USA.

**LINK**

https://www.model-engineer.co.uk/forums/postings.asp?th=143052

^^^ a quick plug for old mart’s excellent work

MichaelG.

Almost right, Emgee. I dont know much about starter nomenclature, so when I read 'DOL' I googled the term and found all the references were to 3phase. In fact I have been using and wiring in both single and 3phase DOLs for long enough! ( A bit like the man surprised to learn he had been speaking in prose all his life!).

Thanks, Mart and Michael. I'll have a proper look at it later.

George B.