I am playing around with a couple of CNC mills. One is a tiny HDPE thing with a Dremel 300 series drill and the other a larger homemade creation with a Trend T4 router.
Both the Dremel and the Trend are 240 VAC variable speed but my problem is that their minimum speed is 10,000rpm and I'd like them a lot slower. (With a really slow feed rate I can engrave mild steel front panels but I think
10,000 rpm isn't good for my cutting bits). I'm thinking of using an external variable speed controller (after bypassing the internal one, if possible). Is it possible to do this with a brushed 240VAC motor and still get reasonable power at low speeds? Can anybody point me in the right direction? (Velleman K2636)? If someone was to tell me how to control the spindle speed directly from Mach3 CNC software I'd be a very happy bunny indeed.Regards, Nigel
Dremel 125W Trend 850W