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Author Topic: Z zero (plane) moves upwards with every Z dir movement  (Read 2301 times)

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Re: Z zero (plane) moves upwards with every Z dir movement
« Reply #10 on: April 08, 2018, 08:14:30 AM »
Well, it still goes off of the original tool path, and in all axes. The acc is now 120 and it still happens. The average feed rate I use is 1000mm/min, if the spindle doesn't tolerate that much, i use even smaller feed rate.

What can be the problem? The drivers and the motors are most likely okay, because I don't believe that all three went wrong at the same time.

Psu?
Or another idea: aspire generates so accurate toolpaths, that mach3 just goes mad about those small coordinates. As is said, my machine can go 0.02 mm on x and y, and 0.01 mm on z. Still goes off all the axes.
In aspire, I set the tolerance to 0,02 from 0.01 and it still happens.
What can be the problem?

One thing is sure. All the axes, when they move off of their path, move in their positive direction more, than in the negative.

I had some unregular carving code today, that went great for 20 minutes and in the last 2 minutes it has gone upwards 5 millimeters.
« Last Edit: April 08, 2018, 08:22:09 AM by norbigazda98 »

Offline ger21

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Re: Z zero (plane) moves upwards with every Z dir movement
« Reply #11 on: April 08, 2018, 08:22:07 AM »
Have you run Drivertest.exe in the Mach3 folder?
You may be getting poor quality step pulses.
Or you may be seeing resonance from your drives, causing lost steps.
There are probably 100 different issues that could cause lost position.

The G-code isn't one of them.
Mach3 will follow the g-code exactly, regardless of the size or location of the moves.
Gerry

2010 Screenset
http://www.thecncwoodworker.com/2010.html

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html
Re: Z zero (plane) moves upwards with every Z dir movement
« Reply #12 on: April 08, 2018, 08:24:04 AM »
And can any of those be a reason for the false position to be in the positive direction all the time and never in the negative?

I'll try that exe, although I don't really know what it does yet. Google is my friend, hopefully.

Offline ger21

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Re: Z zero (plane) moves upwards with every Z dir movement
« Reply #13 on: April 08, 2018, 08:26:19 AM »
If you are talking about the Z axis only, I still think it's losing steps due to being underpowered. This is a very common occurence, and has happened to many people.

If you see this with all axes, then I'd look at the voltage of the direction signal. Many people have issues where the machine tends to move in only one direction, which is an issue with the voltage on the direction pin.
Gerry

2010 Screenset
http://www.thecncwoodworker.com/2010.html

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html
Re: Z zero (plane) moves upwards with every Z dir movement
« Reply #14 on: April 08, 2018, 08:30:35 AM »
Might the problem be that the pc isn't a simple winxp one core "standard pc"?
It is an intel pentium e6600 with 1 gigabyte of ram running win 7 starter 32bit, acpi.
Re: Z zero (plane) moves upwards with every Z dir movement
« Reply #15 on: April 08, 2018, 08:35:01 AM »
I saw this only on the z axis before, but on today's code I noticed it on all the axes.

What should those dir voltages be?

Offline ger21

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Re: Z zero (plane) moves upwards with every Z dir movement
« Reply #16 on: April 08, 2018, 08:38:44 AM »
0V in one direction, and 5V in the other direction.

As I said, run Drivertest.exe in the Mach3 folder, and check the results.
I have a laptop that is unusable with Mach3 when setup as ACPI, but works perfect when configured as Standard PC.

When using the parallel port, Mach3 seems to work best on much older PC's.
Gerry

2010 Screenset
http://www.thecncwoodworker.com/2010.html

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html
Re: Z zero (plane) moves upwards with every Z dir movement
« Reply #17 on: April 08, 2018, 09:30:57 AM »
So I measured and ran the test.
It said system excellent the whole time, never going too fast or slow, although there were some smaller spikes but the results were constant.

I measured the pc psu voltages: 11.86, 5.1 (in the USB outlets too) and 6.67 volts.
I measured the dir and other voltages, too. Although the machine was stationary.
If the estop is on, I measure 4.168-4.170 volts and if it isn't on, I measure 4.258-4.267 volts. On the breakout board between the pcgnd and pc5v pins I measure 4.480 volt
From your latest post, I assume that it is important to measure while the machine is jogging. If the drivers get their power, I measure 4.155 volts on the dir pins.
While jogging z I measure 4.110 volts on Z, 4.159 on X while jogging x and 4.157 on y while jogging. In the other I measure 0 .
The pul pins go down from 4.1-4.2 to 3.885 while moving.
I measure 3.4v one the ena while disabled and 0 while enabled.

The psu for the machine gives 35.7 volts and doesn't go under 35.55 volts even when all the axes are moving.

On windows 7 I only have options for acpi
« Last Edit: April 08, 2018, 09:36:27 AM by norbigazda98 »

Offline ger21

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Re: Z zero (plane) moves upwards with every Z dir movement
« Reply #18 on: April 08, 2018, 09:53:02 AM »
Quote
It said system excellent the whole time
Disregard the messages. Watch the pulse rate, and make sure it is fairly sable the whole time.

It could be that the voltage on the dir lines is on the low side??
Gerry

2010 Screenset
http://www.thecncwoodworker.com/2010.html

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html
Re: Z zero (plane) moves upwards with every Z dir movement
« Reply #19 on: April 08, 2018, 09:55:36 AM »
Okay. I'll try it again.


Edit: it is between 23544. and 23563 hz
Shortest and longest times are 41 and 53 uS.

What do you mean by the voltage being on the low side?
That it should be more than 4.1? I guess it should be more than 4.5, too. But it isn't. It might it be the breakout board that is not good or the pc cannot supply enough current on the usb?
« Last Edit: April 08, 2018, 10:03:42 AM by norbigazda98 »