Dutchman
05-01-2009, 03:12 AM
Went back and forth, forth and back. Rotary phase converter or VFD. Even had some email with Buckshot about how he handled this situation. With a 2 speed motor and 10 speeds I really didn't feel the need for a VFD if it was mainly going to be used as a phase converter. So I spent a little more and did it this way. Purchased off ebay was about $340 delivered. Three hp rating. Its 2X the capacity of the 1.5 hp mill motor. The converter will handle 2.2Kw while the motor is 500/1000 watts. So again, twice capacity. Tonight I finished the installation on the wall. Lacks only a cover plate for the switch.
Gotta say.. this Enco mill at 3500 rpm is singing! Geez that's fast. Made the converter generator dip down at that speed, too, because of the large pulley ratio starting up but it functioned just as its supposed to. The converter box is hanging on the wall to the left of the mill. The lower photo has the cover plate on the box installed.
I used #10 wire for everything. The rubber cable to the 3 phase generator and to the mill is 10/4 600 volt cable.
http://images44.fotki.com/v1419/photos/4/28344/7321255/ee02-vi.jpg
http://images44.fotki.com/v1488/photos/4/28344/7321255/pc12-vi.jpg
http://images49.fotki.com/v1496/photos/4/28344/7321255/ee14-vi.jpg
Trammed the mill head. I was using a Starrett .001" .250" travel indicator. Adjusted to zero-to-zero with no noticable variation. I'll put the 10,000th indicator on it later. The front to back tram shows +.001" at the front of the table. And with the indicator resting on the table in 26" of table travel is +.002" error. That's .0005" in 6" of travel. Not too bad. Haven't checked the runout on the spindle yet.
This is an Enco 1525 mill. 8x36" table. "Baby Bridgeport" - 1,600 lbs.
http://images44.fotki.com/v1419/photos/4/28344/7321255/ee03-vi.jpg
Dutch
Gotta say.. this Enco mill at 3500 rpm is singing! Geez that's fast. Made the converter generator dip down at that speed, too, because of the large pulley ratio starting up but it functioned just as its supposed to. The converter box is hanging on the wall to the left of the mill. The lower photo has the cover plate on the box installed.
I used #10 wire for everything. The rubber cable to the 3 phase generator and to the mill is 10/4 600 volt cable.
http://images44.fotki.com/v1419/photos/4/28344/7321255/ee02-vi.jpg
http://images44.fotki.com/v1488/photos/4/28344/7321255/pc12-vi.jpg
http://images49.fotki.com/v1496/photos/4/28344/7321255/ee14-vi.jpg
Trammed the mill head. I was using a Starrett .001" .250" travel indicator. Adjusted to zero-to-zero with no noticable variation. I'll put the 10,000th indicator on it later. The front to back tram shows +.001" at the front of the table. And with the indicator resting on the table in 26" of table travel is +.002" error. That's .0005" in 6" of travel. Not too bad. Haven't checked the runout on the spindle yet.
This is an Enco 1525 mill. 8x36" table. "Baby Bridgeport" - 1,600 lbs.
http://images44.fotki.com/v1419/photos/4/28344/7321255/ee03-vi.jpg
Dutch