Power supply for Servo DC Question

[GEORGETOUBALIS]

The encoders are 250 steps.!

[GEORGETOUBALIS]

Originally Posted by cjmerlincnc To get any kind of speed and resolution out of Mach3 from the printer port setup, you'll need a max of 2000 pulses per 1mm travel. John

I need your help with some calulations.
The design of my table is someyhing like this. working area 1000mm X 700mm
Then I deside not to give about 30.000$ for this table (everything is Bocsh rexroth).


The basic design stay the same but with linear tables from Parker.
I allready have the X and Z
X: parker XR406 800mm
Z: parker XR404 200mm

In 2 day I will have the other 2 Y Axis XR406 800mm.
Everything from Ebay... (about 2000$)

For the Calculations Now.!
The encoder is 250 CPR
The Two Y Axis Has 10mm lead
With the Mach3 give about 45000 pulses per sec
I have
2700 screw RPM
45cm per Sec
and 0.010mm per step
the motor has max speed 4000 at 90V dc
then with 2700 need only 60.75 Vdc


The X Axis has 25mm lead With a Reduction 2.5/1 The motor needs the same Voltage (60.75 Vdc)

I thing that with mach3 pulse limitation my p/s (75V dc 30A) is OK.. as the motor need only 60V DC.
I am graphic designer not an engineer. Engineering is my hobby so is possible that my opinion is tottaly wrong.

[cjmerlincnc]

I dont see anything wrong in your calcs for achieving speed so if your drives are continuously faulting then the only other 2 things it could be is tuning of the motors/drives or increase the gearing ratio to the ballscrews.

I've never built that type of system but 45cm per sec seems way to fast to me. I'd suggest going 4:1 gearing that will reduce the strain on the motors and increase resolution and you'll still get a respectable speed.

I hope this helps.

[GEORGETOUBALIS]

Originally Posted by cjmerlincnc I dont see anything wrong in your calcs for achieving speed so if your drives are continuously faulting then the only other 2 things it could be is tuning of the motors/drives or increase the gearing ratio to the ballscrews. I've never built that type of system but 45cm per sec seems way to fast to me.

The 1rst P/S was a 53V DC 13A .Thats why I think my drives are continuously faulting.


My CNC machine is for this application.
http://www.ijfisnar.net/movies.htm

Thats why I need Speed.

[gridley51]

You are trying to attain a speed of 27metres/minute.What is the weight of the part you are moving?
Mark.

[GEORGETOUBALIS]

Originally Posted by gridley51 You are trying to attain a speed of 27metres/minute.What is the weight of the part you are moving? Mark.

The dispense head is About 4-5 Kg.!
The X Axis is 25kg (with motor)
The Z Axis is 9kg (with motor)

I have 2 Y Axis With 2 motors to move the Y Axis.

The minimum speed I want to reach production rate requirements is about 20cm/sec.