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Topics - Romanr9999

Pages: 1
1
General Mach Discussion / G0 not moving at max speed
« on: July 20, 2014, 10:46:58 PM »
Hello.
I noticed something strange today. Whenever I do a G0 command it moves slower than if I use the jog keys.
In the motor tuning setup I have 5000 mm/min and my G0 moves go at 2000 mm/min.
Why is that?

2
General Mach Discussion / Encoders config
« on: October 05, 2012, 04:13:48 PM »
Hi everyone.

I converted a manual mill to CNC and installed ballscrews, steppers and also encoders, so I can keep the 'manual mode' where the encoders tell Mach3 how far I manually move the table.

My encoders have 1000 ppr and the ballscrews have a 5mm pitch, so the counts per unit should be 800. This is my current setup.

Now, after some testing I discovered the following:

I marked the 400mm on the table and double checked this with movements with the steppers.

To make sure I'm not dealing with any noise coming from the steppers or the drivers, I turned them all off and moved the table manually.
I move the table 400mm and the encoder says I moved 404.125mm (not sure if the decimal portion of the 404.125 is ok, but for sure it was a little over 4mm more than expected).
This means I have over 10% of error, way too high.

Why could this be happening?

Thanks in advance to everyone.

3
General Mach Discussion / Can't get G31 to work
« on: October 04, 2012, 06:54:29 PM »
I've been trying to test a tool zeroing script and got stuck with G31 command.

For debugging purposes I went to MDI screen and tried the command there and it works funny.
I enter for example G31X10F50 and each time I execute this same command (I tried a hundred times) either X does not move at all or it moves some random length like 0.0125mm, 0.0062, etc.

If I try G0 commands it works perfectly. Same thing on Y axis.

I also suspected that there could be a problem with the probe (I made it myself) receiving 'noise' and giving false signals, so I created a brain that presses the RESET button when the probe signal goes active and this never happens (no reset at all).

Any clues?? What am I missing??????


4
Hi everyone.

I installed ball screws and stepper motors to control XYZ axis in a milling machine. I also installed rotary ecoders on each axis.

The idea is to be able to use the machine in manual mode (moving the axis using the handles and not the steppers) and have Mach to show the actual table position on the DROs.

I've searched the forum and found a lot of people that wanted to do this, but I still couldn't figure it out.

Please help. Thanks a lot.


5
General Mach Discussion / spindle speed via modbus
« on: November 09, 2010, 07:46:39 AM »
Is it possible to control the spindle speed using a frequency inverter and sending the speed information from Mach3 via Modbus?

I know I can use PWM or pulse/dir signals, although I´m running out of available pins, so I thought using modbus for this.

6
Machscreen Screen Designer / Modbus DRO
« on: November 08, 2010, 08:02:21 PM »
I´m working in a resin dispensing machine that uses Mach3 and has  a PLC to control some machine functions.
One functions the PLC controls is a variable speed resin pump. I need to control the pump speed from within a Mach3 screen.
The idea is to have a DRO in the screen with the pump RPM and be able to send this value to the PLC via modbus. The RPM value should be a discrete value going from 1 to 100.

I understand how to use modbus for bit signals (like a sensor on-off status) but I don´t get how to use it for discrete values.

Any leads to point me in the right direction would be greately appreciated.
Thanks.

7
General Mach Discussion / Define variables and transmit them via Modbus
« on: November 03, 2010, 12:48:27 PM »
Hi all.
I´building a resin dispensing machine that uses Mach3 and also has PLC to control several functions.
One of the functions controlled by the PLC is a variable speed pump. The PLC controls the start, stop and the speed of the pump.
I need to be able to setup a speed value within Mach3 screen with a DRO in a custom screen and then send that value to the PLC via Modbus.
I already have Mach3 and the PLC talking over Modbus and I can send back and forth PLC and Mach3 I/O signals, although I have no idea about how to send a discreet value (like 1000) neither how to store that value within Mach3.
One option I thought possible is to store this value in Mach3 could be spindle speed, although I have no idea about how to send this via Modbus.

8
G-Code, CAD, and CAM discussions / Resin dispensing machine
« on: September 06, 2009, 09:12:04 PM »
Hello all.
I´m quite newnie at this.
The project I´m working on is a dispensing machine that needs to dispense resing along different graphic shapes.
Since the people who will be using this has no coding knowledge, the idea is to use a CAM software so we can start from a graphic (either image or vectorized).
The biggest challenge right now is to be able to vary the dispensing rate when the line is narrow.
For example, if I need to dispense the resin along a word written using a script font. The line with is not constant, so where it´s narrower I need to either move the nozzle faster (X and Y axes) or to dispense the resin slower (Z axis) so I release the proper amount of resin.

How can I do this starting from a graphic??

Can this application be thought as an engraving machine using a v-shaped tool where the deeper the Z axis goes, the wider the line?????


Thanks for your help

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