Messages

5011

General Mach Discussion / Re: Servio motor Delta adas b2 Software and electronic gear ratio

« on: March 17, 2018, 06:07:34 PM »

Hi,
make sure P1-46 is 2500

Craig

5012

General Mach Discussion / Re: Servio motor Delta adas b2 Software and electronic gear ratio

« on: March 17, 2018, 05:59:40 PM »

Hi,
the point of having an electronic gear ratio is that if you have a controller that has a slow output pulse rate that it can still be used to provide the
fast encoder count required by the servo. Just because the manufacturer put electronic gearing there doesn't mean you have to use it.

With the electronic ratio set to 1 (numerator and denominator equal) if Mach/ESS produces 114,000 pulses per second your servo should spin 11.4 revs per
second or 684 rpm.
Note this assumes a 10000 count encoder. Make sure that this is the case.

Craig

5013

General Mach Discussion / Re: Step/Dir control of spindle?

« on: March 17, 2018, 05:49:00 PM »

Hi Roger,
its not a spindle drive its a servo drive and accepts pulse inputs.

Mach4 provides trajectory data, its the ESS that generates the pulses. An ESS can generate pulse streams up to 4MHz, which is academic because my servo drive
can accept up to 500kHz with differential signaling.

As I don't require fine angular resolution on my spindle I elected to use electronic gearing to reduce the pulse rate so I could use a standard BoB and single
ended signaling to the servo drive. Even with the loss of resolution the electronic gearing implies its still capable of 27 arc min resolution, very adequate!

Craig

5014

Mach4 General Discussion / Re: How to examine # variables?

« on: March 17, 2018, 04:07:23 PM »

Hi,
yes:
Diagnostic Tab/Regfile and expand #variables and apply a range.

Craig

5015

General Mach Discussion / Re: Mach3 Settings Keep Changing

« on: March 17, 2018, 02:31:15 PM »

Hi,

When calibrating the axis I tell it to move 5 and it moves 5 inches not mm.

If your native units are mm then when you MDI a move of 5 it should move 5 mm NOT 5 inches. Your calibration is wrong by a factor of 25,

Craig

5016

Mach4 General Discussion / Re: Mach4 Button OFFLINE

« on: March 17, 2018, 02:18:38 PM »

Hi,
I don't use Mach Lathe so I can't comment,

One thing I noticed:

2-blacklash DOES NOT WORK !!!

Backlash compensation is a motion controller function not Mach. If you wish backlash to work try hassling CSLabs.

Craig

5017

General Mach Discussion / Re: Step/Dir control of spindle?

« on: March 17, 2018, 08:11:59 AM »

Hi Roger,
I use Mach4 and my high torque spindle is a 1.8kW servo. It has an 8000 count per rev encoder and rated speed of 3500rpm.
with electronic gearing of 10 the required pulse rate is (3500/60)*8000/10=46.66kHz. My ESS/BoB signals that no trouble
single ended. According to the manualif I used differentia signaling I wouldn't have to use gearing ie a pulse rate of 466.6kHz.

Craig

5018

General Mach Discussion / Re: Motor Turning Errors

« on: March 17, 2018, 02:27:15 AM »

Hi,
well I can't think of anything that would cause that mix of symptoms.

If the X axis jogs OK the surely so should the Y axis.

I will think about it some more, I hope someone else can chime in with a solution or even an explanation, its got me stumped.

Craig

5019

General Mach Discussion / Re: Homing operation does not pulls back enough to get away from switch?

« on: March 17, 2018, 02:22:51 AM »

Hi,
a lot of switches, including snap action microswitches have hysteresis. It means that the switch makes at position x=0 but when it unmakes it has to travel
a bit further say x=-0.1. For home switches this is a good thing.

When Mach homes an axis it drives to the home switch in the direction and speed that you specify on the setup page until the switch makes. When the switch makes Mach
will stop and back up until the switch unmakes, ie the hysteresis distance. You've already noted that if that distance is too small it is possible for flexure in the machine to cause the
switch to re-trigger. Thus for home switch a small but repeatable hysteresis is desirable.

Note that switches with vanishing small hysteresis are available but are expensive and actually unsuitable for this purpose.

I not also in your post that when you set the Home Off distance on the setup page you expected the axis to drive backwards that distance. Mach doesn't do that.
What Mach does in fact is drive until the switch makes, then reverse until the switch unmakes and then set the machine coordinate of the axis to zero if no
Home Off distance is specified or the Home Off distance if it is specified. Note Mach DOES NOT drive to that remote location, it just sets the machine coordinates
to some remote location.

This has caused a lot of confusion over the years. Note also just to complicate matters a bit there is at least one external motion control board (PoKeys) that
can drive to that remote location if you program it to do so. It is not standard Mach behavior. Note also that with a macro you can cause Mach to go to a remote
location and achieve the same result, it just requires a short program.

Craig

5020

General Mach Discussion / Re: Homing operation does not pulls back enough to get away from switch?

« on: March 16, 2018, 08:52:38 PM »

Hi,
in Machs early days everyone used a parallel port and need to be very frugal with inputs, theres oly five in a parallel port. Combining limit and home switches
was required. It caused problems with compatibility then and it still does now.

With extra BoBs and external motion controllers as cheap as they are theres no need to do it any more.

Craig