Gallery, Projects and General > Project Logs
Mill Power feed
Darren:
BTW, I've got transformers coming out of my ears here, along with variacs, transistors etc etc.
I can make nice power supplies from low voltage to 4.3KV at 5amps. Used for some big valves !!
But forget all that, sometimes it's hard to make something simple. Bit like what Bogs said about once you start doing something precise it's difficult to just knock something up.
What you think about the series pot, I've never tried it, I'll see if I have something suitable tomorrow.
Darren:
Or like you said,
Use a dimmer switch to a 12V transformer followed by a rectifier, (never tried a single diode, but half wave should be fine) That should do it?
Dimmer switches are easy to find, as are 12V transformers.
John Hill:
Re the pot, 12V at 4A is 48 watts so to run your motor on that supply would need a 48 watt pot! That would look like one of those old resistance coil things they once used to control stage lighting!
Do you have any nicrome wire? Perhaps the heater from an old clothes dryer? As an experiment just stretch a single wire, a foot or so, between two nails in a bit of wood and use a couple of battery clips to put more or less in series with the motor, that will give you a feel for what a pot control would be like.
John Hill:
Half wave means higher voltage for the same amount of power, more easily overcomes inertia etc at low speeds (I think).
Not all dimmers are the same but I think that would be worth a try.
Darren:
Yes, quite right, low voltage = high current, hence using a dimmer on the 240V side. Far far lower current there.
BTW, I wasn't thinking of using a pot on it's own but in series with a resistor to take the load.
I do have nichrome wire, in the form of some very large ceramic tubes as variable resistors, but these are not very practical :lol:
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