meple

Here is a lock from Bristol area.

Isn't it to be found in either vol 1 or 2 of the LMS plan book by OPC?

I can recommend Barnack Uk at Stamford, they do tools and bits for the Emco range.

 

Available on e-bay.

I think you mean Pro Machine Tools Ltd at Barnack.

Not in my humble one - resistors on LEDs are not a sliding scale like a lamp, they dim a bit and then go out - but each to their own of course.

Drive them with a PWM circuit - that gives controllable dimness (if there is such a word).

It sounds like the WW controller was PWM, with an increasing level of DC as the speed increases, this is the typical way they operate. This type uses the load to assess the current supplied, just like a regulator chip.

 

 

I built the WW controller. As you say the design was such that as the throttle was turned up the base voltage increased until the pulses disapeared and you got pure DC.

There's no way that curve into the double slip is going to work. It's got to be less that 150mm radius.