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Messages - joeaverage

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121
Hi,

Quote
I was more interested in the all in one as it closes the loop to the controller vs just the servo

But that what it does. The rotary encoder handle the servo internal loops but the glass scale does the position loop which includes the non-linearities and
lash, the servo can do just exactly what the feed back controller does....only better! What I'm saying is these 'load sensing' servos EXCEED the full closed loop
controller.

Craig

122
Hi,
what motion controller?

Also look under Help/About and just check the license status. Its not impossible or unheard of for a PCs PCID to change with a Windows update or similar and then the
PC becomes unlicensed.

Craig

123
Hi,

Quote
I had debated about going with the Centroid all in one DC control which is a true closed loop and would be able to utilize their provided motor encoders and the glass scale feedback.    Right now, I don't think it's worth it, if my situation changes or I have some extra cash lying around I might explore that as I think it would be more reliable.   

To be honest I don't think that is the way to go. It has become increasingly rare for a controller to accept feedback from a glass scale. The old standards like Galil and Dynamotion are joined by
a few recent ones like the Centroid Oak.....but they are a dying breed.

If you want to use a glass scale to close the position loop then buy a servo that can do so, for example a Delta A2. It has a regular 20 bit rotary encoder to close the velocity and torque
loops but a secondary encoder, for example  a glass scale, to close the position loop. No need to spend big dollars on a feedback capable controller when the servo drive can do it...and so much
better and without the complication. A 750W Delta A2 costs $640USD whereas the 750W B2 (which does not have the secondary encoder feature) is $438USD, so you do pay a premium but still way cheaper
than a Galil or whatever.

All the top servo manufacturers have models with this feature, it often called 'load sensing', that is it senses the position of the load or axis. They do command a premium but they sure 'put
a horn on a jellyfish'.

Craig

124
Hi,

Quote
Well, assuming that what you have is like the one in the photos with a 10k speed control potentiometer, then probably one end of the pot will have 10V on it and the other 0V.

That's pure guess work, and a guesses go its pretty fair too....but you can't afford to guess.

I see there is a micro on the board likely 5V or maybe 3.3V. Its far from impossible that the pot is connected to the micro, ie 3.3V or 5V. If you come along
and blithely apply 10V you could pop the micro...and it would be your fault.

You need to find out about the control board first. Any talk of a C89 or any other board is way premature.

Craig

125
General Mach Discussion / Re: Mach3 fails to reopen
« on: March 28, 2023, 06:23:34 PM »
Hi,
if you have not already paid for a Mach3 license then I wouldn't bother, just go to Mach4.

Mach4 does in a practical sense require an external motion controller, I have used an Ethernet SmoothStepper with success for eight years.

https://www.machsupport.com/forum/index.php?topic=42891.msg278176#msg278176

Craig

126
Hi,
I would concern myself less with the C89 board but you need to know how to interface to the motor controller.

I see for instance that it has a pot, but that does NOT necessarily mean you can put an analog voltage straight in there.
Documentation on the motor controller is whats required...and likely that's in Chinese.

Craig

127
Hi,
if I'm not mistaken the Aux Encoders are all reported in encoder counts not units. You would have to do a calculation to convert encoder counts to
distance units.

Craig

128
General Mach Discussion / Re: Mach3 fails to reopen
« on: March 28, 2023, 06:01:16 PM »
Hi,
are you trying to use a parallel port?

If so then Windows 10 is no good, you need 32 bit Windows7 or earlier.

There is a thread on this board also about Windows updates screwing Mach3 up, there was a patch made.

Otherwise ditch Mach3 and get Mach4, it better in every regard.

Craig

129
General Mach Discussion / Re: 2 Different auto zeros
« on: March 28, 2023, 05:57:50 PM »
Hi,
Mach4 has four independent Probe channel.....multiple tool setters are not a problem.

Craig

130
Hi,

Quote
No. The Z would go to zero, trip the switch and all would stop

My apologies, I've had a much closer look at the code and realised its not quite how I thought. These are the two lines in the function:

Code: [Select]
mc.mcCntlMdiExecute(inst, "G00 X0 Y0")--Without Z moves
    --mc.mcCntlMdiExecute(inst, "G00 G53 Z0\nG00 X0 Y0 A0\nG00 Z0")--With Z moves

Note the first line  mc.mcCntlMdiExecute(inst, "G00 X0 Y0") just moves direct to x0y0 irrespevtive of where the  Z axis is. If its up above the material
all is well but if the tool is still down in the material then it will drag through it on the way to x0y0.

The second line  mc.mcCntlMdiExecute(inst, "G00 G53 Z0\nG00 X0 Y0 A0\nG00 Z0") goes to Z zero, but in machine coordinates, and then to x0y0, and then to z0
in work coordinates. Thus the initial move is up and out of the way. When you say the machine stops is because it hits the Z axis limit switch. That's your own fault...
whats the point of having a Home location that errors out? The home location should be say 1mm inside the Limit switch so that you can drive to the Home location
without a Limit fault.

Just as an example: my mill has three switches on each axis, two Limits and one Home switch. The Limit switches are and the very end, about 1mm inside the mechanical
stops. I have set the SoftLimits to be about 1mm inside the Limit switches and the Home switch about 1mm inside the SoftLimits. That means my Home location is 2mm
inside the Limits, and consequently I can drive to the Home location WITHOUT triggering either a Limit OR a SoftLimit.

I have attached a pic. You can see the switch on the left is slightly closer to the top of the Z axis and is the Z axis upper Limit switch whereas the switch on the right is somewhat lower,
ie the Z axis Home switch.

I have elected to have two Limit switches and one Home switch per axis, and all on their own breakout board input but you don't have to do that. You could use the upper limit switch
as a Limit and a Home, but you need to set a realistic Home Offset parameter so that Mach can distinguish between a Home and a limit. Lets say you choose a Home Offset of 2mm
then in the code above the Z axis would go to the near (within 2mm) the top, but would not trigger the Z axis limit. 

Craig

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