Messages

41

Show"N"Tell ( Your Machines) / Re: 1997 DYNA MYTE DM4800 VMC to Mach3 Conversion

« on: July 18, 2012, 07:14:09 PM »

Looks good and cheaper than the Yaskawas but slightly less torque. Looking forward to seeing the results..the Yaskawa drive has a built in inverter because the motors are still 3 phase and it does seem to draw more amps than the 1.5kw 3 phase drive model.
John.

42

Show"N"Tell ( Your Machines) / Re: 1997 DYNA MYTE DM4800 VMC to Mach3 Conversion

« on: July 18, 2012, 04:38:04 PM »

Good work JH. How are you doing with the axis servos...I noticed you had to downsize the motors to stay with the single phase power supply. Do you think they will be  powerfully enough to move that big bed and cut metal at the same time.
I managed to get a 1.5kw single phase Yaskawa drive and motor. The new Sigma5 is very compact..I got a new old stock Sigma 2 drive and a 8nm  1500rpm sgmgh motor..its a real beast of a motor for a single phase unit! Not cheap though..the sigma5 motor/drive is about 1800 gbp.

43

Show"N"Tell ( Your Machines) / Re: 1997 DYNA MYTE DM4800 VMC to Mach3 Conversion

« on: May 03, 2012, 02:35:37 AM »

Not being well up on rotary phase converters could you run the whole machine off one? Would save doing a retrofit..

44

Show"N"Tell ( Your Machines) / Re: 1997 DYNA MYTE DM4800 VMC to Mach3 Conversion

« on: May 02, 2012, 07:52:01 AM »

The frequel is the spindle drive and the other unit is the Mitsubishi cnc controller. Expensive to buy but super reliable.

45

Show"N"Tell ( Your Machines) / Re: 1997 DYNA MYTE DM4800 VMC to Mach3 Conversion

« on: May 01, 2012, 04:30:39 AM »

Yes I agree with hood. Some of the ac motors on later machines had the motor commutation performed on the control motherboard using the encoder feedback. If an encoder went down it was impossible to have a motor run away as the control needed the encoder to command the motor rotation. The encoder signal was then used for positioning and speed at the drive.
The early Fanuc ac drives worked this way before they went digital.  On the digital Fanuc drives all the position speed and commutation was done on the control and the drive was just a dumb power supply for the motor.
John

46

Show"N"Tell ( Your Machines) / Re: 1997 DYNA MYTE DM4800 VMC to Mach3 Conversion

« on: November 28, 2011, 12:50:37 PM »

Might be G84 that's pretty standard. Rigid tap is usually an option and requires an encoder either mounted on the spindle or on the spindle motor. Swap axis is common where the spindle axis becomes the x or y axis during the tapping cycle.
John.

47

Show"N"Tell ( Your Machines) / Re: 1997 DYNA MYTE DM4800 VMC to Mach3 Conversion

« on: November 16, 2011, 11:58:52 PM »

Looks great JH. How do the new motors compare to the originals speed and torque wise. They look smaller but the newer motors can produce more power from a smaller frame size I presume.

John.

48

Show"N"Tell ( Your Machines) / Re: 1997 DYNA MYTE DM4800 VMC to Mach3 Conversion

« on: November 09, 2011, 01:44:45 PM »

I have a similar size vmc. It uses 2000rpm 8nm  servos geared at 2:1 with pulleys and 10mm pitch 32mm diameter ball screws. Just as a reference.
John.

49

Galil / Re: Mitsubishi MR-J2-40A with Galil icm 1900 wiring help needed!

« on: November 07, 2011, 03:24:49 AM »

My bad 

J

50

Galil / Re: Mitsubishi MR-J2-40A with Galil icm 1900 wiring help needed!

« on: November 06, 2011, 12:58:28 PM »

Sorry my fault had the plug the wrong way up compared to the diagram dooh!