Messages

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

Brains Development / Re: Rapid feed button brain

« on: July 19, 2014, 02:05:37 PM »

Any luck with this?
I'm trying to do this exact same thing and I couldn't find it either.
I hava an arduino board connected with modbus to Mach3 to handle the inputs and I already have the jog keys working. Now I need the "jog override" key.
Thanks in advance

3

General Mach Discussion / Re: Encoders config

« on: November 30, 2012, 09:50:47 AM »

My apologies for not getting back to you guys with this.
Due to work priorities I had to postpone this project and I haven't been able to test changing resistors yet.
As soon as I'm able to test this I'll let everybody know whether it works or not.
Thanks to all for your help

4

General Mach Discussion / Re: Encoders config

« on: October 08, 2012, 02:41:55 PM »

I'll try and let U know.

5

General Mach Discussion / Re: Encoders config

« on: October 08, 2012, 02:17:33 PM »

I'm using a 4k7 resistor for the base. the signal from the encoder is either 0 or 24 and the switching time should be extremely high (I assume since the encoders allow up to 5000 rpm) to affect here.

6

General Mach Discussion / Re: Encoders config

« on: October 08, 2012, 01:50:27 PM »

I tested at VERY LOW and VERY HIGH speeds and I still get errors in both cases.

I also played with the debounce and no luck.

7

General Mach Discussion / Re: Encoders config

« on: October 08, 2012, 01:48:26 PM »

I do believe as well it may be noise. I had noise issues testing my probe, so this could be happening here too.
with the probe I put a couple capacitors across the input and that worked as a charm, although I can't do that here since the capacitor would mask the pulses. With the probe is ok because there I don't expect a pulse train.

How can I filter the noise in this case?

8

General Mach Discussion / Re: Encoders config

« on: October 08, 2012, 01:35:39 PM »

No, the error accumulates. If i MDI from 0 to 400 and back to 0 the encoders don't show 0, although the won't show everytime the exact same number.

9

General Mach Discussion / Re: Encoders config

« on: October 08, 2012, 01:12:36 PM »

TP, The error is usually close but not 100% exact all the times. I thought about trying to adjust the ppr setup. Right now is setup in 800 and using something like 803 doesn't sound like a proper way to solve it. Anyway, the error is not exactly the same all the times.

RUSS, I know what you say and I saw it when I ordered the encoders. The encoders are HE50B-8-1000-3-T-24, so based on the model # they are 1000 ppr and that's what I ordered. The only thing I missed when I ordered was to try 5v instead of 24v. Now I put a BC547 transistor on each signal to adjust form 24v to the 5v I need at the board input.

The board I'm using to interface with the LPT uses a 74HC244P to isolate the LPT from the machine, although I don't think this could be causing a problem.

10

General Mach Discussion / Re: Encoders config

« on: October 08, 2012, 12:23:01 PM »

Now, any ideas why the encoders are not giving the same measurement as the DROs ?

This is driving me nuts. If I can't get this solved, I won't be able to use the machine in manual mode.