speed control

hi all,

I am hoping someone will be able to advise me i want to change to a differand type of speed control on my xj12 milling machine i have problems with the speed not running constant i dont want to pay £80 + on the same type of component as i dont like them so i was hoping someone may be able to help in pointing me in the way to go.Many thanks.

kevin

Kevin,

I believe the controller boards on the XJ12 series mills if of the American design are about the best there is I'm afraid, there's only some much control you can have over a brushed pm dc motor....( unless you have one of the FET based controllers which are pretty crap...)

The features of the KB controllers and their Chinese derivatives are such that they use feed back from the motor to give almost constant speed and torque....can't think how that can be bettered...

Short of changing to a 3 phase setup which I doubt you'd find a motor with a similar footprint....

Have you you tried going through the setup procedure for the controller? Assuming it is a KB type....maybe you can confirm this? ( I have a copy of the manual should you need it....else look here..http://www.kbelectronics.com/manuals/kbic_manual.pdf.  

just as an aside, my lathe has a 1.5kw dc pm motor with what looks like a KB controller, and it works well.....lots of torque even at low speed....

many thanks John but i dont know if its what you said unfortunatly i got the mill secondhand and there was no manual i dont have a clue when it comes to electronics i will try get a photo so then maybee you will be able to confirm which type it is.

I have uploaded some photos into album hope that you will be able to tell me which it is.