The Shop > Tools
Lathe Jaguar VXS inverter - remote pendant
raynerd:
Well it was February when I posted this and I've still not fixed it! This is the week!!! :headbang:
mfletch - I can't see a circuit diagram just the wiring and settings (which are useful)
David, mentioned that the pot is not identified as log/Lin - Does anyone have any suggestions as to what I buy from maplin tomorrow - size and log/lin?
I am really still stuck as to an appropriate circuit and would really appreciate any guidance as I have a use for my lathe after any months of inactivity. I finally have a week off work and free...
AdeV:
Assuming the lathe starts at a decent slow speed, and assuming top speed is OK; use your multimeter to read the maximum value of the existing pot (read the outer two terminals), that'll give you the value you need.
To determine if it's log or lin, take 2 readings at 1/3rd and 2/3rds travel. If the line from zero to maximum through those two points is more or less straight, it's linear.
raynerd:
Ade, thanks for the info, good to speak to you again, not been on in a while.
The current controller is in bits. It didn't have a slow speed at the end, just started at full speed (which was very high!). The only way to get a slow speed was to set jog, which gave about 40-60 rpm. Without jog, it was just full speed.
As I have said, it has never been right and the control of the speed has never been linear. Would it be too much of a presumption to suggest that the old/existing pot is the wrong type and try the opposite.
The original wiring of the controller/pendant was also off in that the start button didn't work correctly with the jog. If you stopped the machine, put it to jog, it would jog. If you then stopped it and flipped off jog, it would start without hitting start! The whole thing never worked properly hence why I'm keen to try a new circuit.
John Rudd:
if its a logarithmic pot the value should have an A or a after it, if its linear then a B or b
mfletch:
on my jaguar vxr I think it is I used a 10k pot
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