Messages

91

General Mach Discussion / Re: HELP g-code command lines and coordinates not synchronized

« on: May 12, 2019, 05:46:26 PM »

Hi
I notice that you are using custom M codes M113 and M115

In macros written in Visual Basic you can use

while ismoving()
wend

So if your m115
has
Code "G1 Z0"
while ismoving()
wend
...
(your codes)

You perhaps may delay the turning off of laser output.

Another possible Workaround is to use a long bent micro-switch to turn on the laser when z axis is lowered towards the material surface. Microswitch would turn off the laser when z axis is raised.
(some have done it that way and made videos on YOUTUBE)

92

General Mach Discussion / Re: HELP g-code command lines and coordinates not synchronized

« on: May 12, 2019, 03:04:49 PM »

Could be, but the Gcode itself is only 10 lines long.

Tweakie.

What I meant was the default lookahead in Mach3 is 20 lines.
What if we change that setting to just 1 (0 is not allowed).
Will Mach3 then execute command line one line at a time SLOWLY?

93

General Mach Discussion / Re: HELP g-code command lines and coordinates not synchronized

« on: May 12, 2019, 07:37:59 AM »

Could it be the Lookahead 20 or more lines in config | general Config?

94

General Mach Discussion / Re: HELP g-code command lines and coordinates not synchronized

« on: May 11, 2019, 05:14:04 PM »

For Laser,
maybe try toggling the CV Mode button OFF
(see attached)

95

General Mach Discussion / Re: Noise and wrong movement of stepper motor on mach3

« on: May 11, 2019, 04:27:16 PM »

You can change the direction by ticking or unticking "DirLowActive" in ports and pins | Motor output.
(see attached)

96

General Mach Discussion / Re: Motors stalling /growling

« on: May 11, 2019, 06:23:22 AM »

I think we are nearly getting there.
Originally his problem was because he had set the pulse & Step width to 0 u secs.
Attached is Electrical Characteristics of his driver which is based on Toshiba TB6600HG.
It says min. pulse width is 2.2 u secs.
(HIS DRIVER IS NOT LIKE A GECKO DRIVER which only need a Negative edge trigger)

So I have told him to set to 5 and 5 (assuming there will be some PCI bus latency loss too).

Jogging should now be OK (subject to a bit more speed and acceleration FINE tunning).

Perhaps setting the lookahead lines to 200 from the MACH3 default of 20 can also help.

Best Regards.


EDIT; Argumentative / contradictory comments removed by moderator.

97

General Mach Discussion / Re: Motors stalling /growling

« on: May 11, 2019, 02:52:51 AM »

Hi,
who cares about CV, at the moment OP is struggling to get the motors to run under certain circumstances
and I don't think kernel speed is the answer. Vast numbers of users run Mach's parallel port at 25kHz without
problem....so why can't OP?

Craig

I read his reply #42.
I thought he is already running better now but sometimes having some CV look ahead jerks which can be solved by increasing Kernel speed.

98

Mach4 General Discussion / Re: Huanyang GT-5R5G-2 VFD control spindle on/off & Fwd/Rev Mach4

« on: May 11, 2019, 02:32:08 AM »

Thank you for the replies.

I have already done P0.01.

I'm stuck on P5.10 page 47-48.  I currently have the following connected to terminals.  Feel like I am missing something in the manual for P5.10.  I also don't understand how to set the K1 or K2 switches in the P5.10.

S1 = Forward
S2 = Reverse
AI1 = Variable Speed
AI2 = Variable Speed

Thoughts?

P5.10 should be set to 1
This means you are selecting 2 relays and mode #2.

K1 and K2 must be 2 units of NO (normally open) relays. 2 relay wires + Digital Common ground = 3 wires.

AI1 connects to 0-10V analogue output. There must also be a connection for Analogue ground so another 2 wires. These two analogue wires must each be wound many turns thru a Ferrite sleeve (AKA choke) each since they are NOT grounded.

So you BOB must have 2 relays + 0-10V (PWM) analogue output. If not you will have to buy relay boards and PWM to analogue (0-10V) converter board to connect to your BOB.

99

General Mach Discussion / Re: Can't Install Mach3 on my PC

« on: May 10, 2019, 08:19:07 PM »

Hi and thanks TPS, I have solved the max spindle speed problem. I fished around and found the place where that can be set.
      The LED's that didn't light up were the EJog ones when the respective axis was jogged. Also there were no green lights showing pins active (Upper right hand side on diagnostics page.) The machine seems to work OK but I am concerned if it were to over-travel.
It appears that the CNC mill doesn't have any home switches or homing facility.
 What would happen if the carriage hit the end of travel? Damage? or overload?
Thanks,Regards  Gary

Attached is a manual usable for your RnR USB motion controller.
Please plan to install Home/Limit switches as a matter of URGENCY.

100

General Mach Discussion / Re: Motors stalling /growling

« on: May 10, 2019, 05:04:02 PM »

Hi
One reason I advise to increase the Kernel speed is based on INFO from Mach3Mysteries.pdf by Art Fennerty.

"The MACH3 planner controls the CV'ing of the lines, as well as taking care of making each output equal to 5 times the kernel interrupt time (kernel speed)."

So MACH3's "planner" has to run slower to match any slower kernel speed.

Art even said
"I don’t mind admitting that a 60Khz run even with motors that don’t move
beyond 20khz is the smoothest option to use. "

BUT (faster kernel speed) has to be traded off to processor speed (Computer CPU speed) and the power required to fill the buffer faster than the engine can empty the buffer.

So, I get a very fast CPU that can give me "EXCELLENT" drivertest result at 100,000Hz then INTENTIONALLY slow down the kernel to 60,000Hz (instead of 100K) and MACH3 will run very well.

To run at 25,000Hz kernel means MACH3 CV planner has to be slow and limited to 200ms.
So MACH3 will run more smoothly in CV mode if kernel speed is higher than 25K (provided you have a fast enough CPU to avoid any buffer under-runs).