In a message dated 02/02/2006 19:55:03 , Sehwuk@xxxxxxx writes: Chaps My first post and it's a question for any and all to answer :- Has anybody out there got, or used, phase converters ?. I'm just on the verge of building the new workshop for an attempt at a 41/2" Burrell but will need bigger machinery than I have at the moment, which really means going to 3 phase. I have heard good and bad things abut these bits of kit but would rather hear from people in the know (as it were). I have definately been told that a rotary will be better than a solid state. ALL replies, good or bad, will be most welcome. Steve Bodgers Retreat, Burwell MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line. Hi Steve, I run my workshop equipment on a static three phase convertor and have run a 3P ring main round the workshop to accommodate the three machines ( Lathe, Mill & Shaper) I did originally build a rotary convertor and it was very successful, using a 1 HP, 3P motor the problem with this was that it was a bit limiting in that it would only run satisfactorily motors of a similar size. The static convertor (a commercial item) is rated at 7hp is well on top of its job and I can if I wish run all 3 Items at the same time. To sum up, Inverters are the cheapest method (other than self build) and of course as a bonus you have full control over the motor speed. Static convertors are the next option, can be built relatively cheaply, or purchased second hand at a modest cost. Rotary Convertors are the most expensive option unless self built. If I were to start again and had to buy new I think I would go down the inverter road given the advantages of speed control etc, for Motors of about 1 Hp they are reasonably priced but the cost climbs quite steeply over this size. As stated by an earlier listee they are available on Ebay at sensible prices with back up. I hope this is of some use to you. Best wishes Don MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.