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Topics - retro-AC-Servo

Pages: 1
1
General Mach Discussion / Random Loss X-Y axis
« on: May 04, 2011, 10:05:02 AM »
Need a little help please. :'(

I've had my machine running since December.  Sometimes After long runs I get a random loss of position on my xy axis.  

What are the most common problems related to this?

I'm running the DMM Tech.- Peak 7.2Nm(1015 OZ-In) high torque AC servo motors, 3 Axis CNC kit for MACH3 on a small Bridgeport mill.

I've replaced all my hardware,  to include drivers,motors and breakout board.  (bought components to retro 2 machines so it was easy to try replacements)

tuned motor velocity as slow as 35 IPM and acceleration 2.  



Seems it mostly happens after 3 or more hours of running.

Any help is greatly appreciated.





2
General Mach Discussion / peck drilling lazycam
« on: December 17, 2010, 10:28:08 PM »
Does the peck drilling feature in lazycam work.  I'm having touble getting it to g83..when I post the to mach3 it show up as g81.

Thanks
Steve

3
General Mach Discussion / Random Loss of Position
« on: December 04, 2010, 02:26:29 PM »
So,  First of all,  Hi everyone!

Green Horn Here.

 I just finished a retrofit of a Anilam knee mill.

 I used the  4 axix AC servo Kit from Dmm Technologies.  

Peak 7.2Nm(1015 OZ-In) high torque AC servo motor, 3 Axis CNC kit for MACH3

Here's some specs:
- 3 x Peak 7.2Nm(1015 Oz-In), rated 2.9Nm(408 Oz-In), Peak power 900W, AC servo motors
- 3 x Dyn2-H AC servo drives for very smooth,quiet,very high efficient driving
- 1 x DMB4250-8B breakout board, fully buffered Opto-isolated I/O, isolated PWM analog output
for spindle speed control,and charge pump. Hardware generated X secondary X' for CNC Gantry with
jump selectable motor turning direction.
- 1 x 6ft DB25 parallel port cable
- 1 x 6ft USB cable
- 2 x 120 or 220Vac input, 350w,+48Vdc, 7.3A output DC power supply
- 3 x 1ft cables between breakout board and drives
- 3 x 10ft differential signal encoder extension cable
- 3 x inductive, non contact , LED indicated proximity Home/Limit Switches
- 1 x Emergency STOP Switch
- Necessary Cables, DMM software for tune up servo

http://www.dmm-tech.com/Products.html

I have everything working good....Except one glitch... Randomly on long runs when the x axis is traversing it will stall or freeze for a 1/4 second or so, suddenly and abruptly. When it continues its motion  it causes the axis to loose its position.  I've checked the PC to make sure nothing is running in the back ground.  I've changed the driver.  I've checked for loose wires.  I don't know where to go from here so any help will greatly be appreciated.

Thanks
Steve

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