SEMCO 1000 Retrofit with AC servos and Mach3. . . . MONSTER BLU . . Her Name.!!

**Clive S** · 10-11-2015

Very nice and informative vid Dean looking forward to seeing the build.

**JAZZCNC** · 11-11-2015

Originally Posted by Clive S

Very nice and informative vid Dean looking forward to seeing the build.

I'm 99.9% sure you'll be the first to see it move Clive. . . . Or with you just being on the other side of Pennines you may find some Servo Motors landing in your back Garden. .

**suesi34e** · 11-11-2015

Hi there mate Monster blue is a monster of a machine with out doubt but it is going to be a beauty also I am sure! Best of luck, lights out time for me but will watch the video tomorrow.

**Noplace** · 11-11-2015

wow I'm so jelous to have such a machine combined with your skill and knowledge you can make the VMC of dreams!

**Neale** · 11-11-2015

I'll be interested to see how you drive a 7.5HP spindle off a domestic supply - that's going to dim the lights when you fire it up! But by the time you get there, I'm sure you'll have a solution...

**njhussey** · 11-11-2015

Subscribed to this thread.....looking forward to seeing this build

**JAZZCNC** · 11-11-2015

Originally Posted by Neale

I'll be interested to see how you drive a 7.5HP spindle off a domestic supply - that's going to dim the lights when you fire it up! But by the time you get there, I'm sure you'll have a solution...

Probably with one of these Digi phase converters which are a more balanced type of Rotary converter that are suited better to sensitive electronics like in VFD or CNC machine. Not cheap thou to buy or Run.!

http://www.digi-phase.co.uk/typef.htm

Did consider a 240 to 415 VFD but not sure they will do the job and I've heard they are a little Dirty regards the feeding crap back into the grid which can't be having if running Servos. Neighbours or YEB i'm not too bothered about but servos taking off or giving grief I can't live with. . .Lol

Any other suggestions greatly received.!

**Neale** · 11-11-2015

I had a similar but smaller-scale problem recently, which is why I asked! I have a lathe with a 3HP/2.2KW motor, 415V/3ph, of course. Without major dismantling and rebuilding the motor, I couldn't do the old delta-star conversion trick. I ended up buying a 240V-415V VF inverter, which is fine up to a point, and that point comes when there is heavy load on the inverter. I run it at 50Hz as the lathe has its own variable-speed drive but although the lathe should go up to 2500RPM, above 2000 the load (not cutting, just idling so to speak) is sufficient to trip the inverter. The problem isn't load as such, but the fact that the input is single-phase rather than the three-phase that it was originally designed to use, compounded by the fact that there is a rather crude voltage doubler to go from 240 to a nominal 480 in front of the inverter. If I could find a big 240-415 transformer that would help. That lot runs off a dedicated 16A supply which is fine. I suspect that if you look into it, the cheapest option might be to go for a three-phase supply to the workshop. It might be cheaper than a massive inverter. Still, you've got plenty of time to save up the pennies! Like everyone else, I'll be watching this one with interest.
[EDIT] Just had a look at those Digi-Phase converters. Haven't come across those before. Unfortunately there isn't quite enough information to see what they can do, although they do sound a step up from the simple rotary converter.