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Messages - joeaverage

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2711
General Mach Discussion / Re: New guy frustration LOL
« on: April 02, 2019, 09:01:48 PM »
Hi,
ah!  Very frustrating, my guess is that he does not know how of maybe it can't be done.
Gerry has given a suggestion that would avoid an unsupported instruction.....try it.

Craig

2712
General Mach Discussion / Re: Stepper motors that shudder.
« on: April 02, 2019, 08:58:47 PM »
Hi,
very nice of you to say, thankyou and you're welcome.

Craig

2713
General Mach Discussion / Re: New guy frustration LOL
« on: April 02, 2019, 07:22:41 PM »
Hi,
then get the vendor to help.....he sold it....he should support it!

Craig

2714
General Mach Discussion / Re: Moves in x direction before step down
« on: April 02, 2019, 07:18:25 PM »
Hi,
glad that you have found and corrected the problem.

Quote
But I am still wondering why your gcode ran perfectly on my third-party simulator.

When I first read this post I downloaded the Gcode and 'ran' it in Mach4 (my norm) and the code performed normally to
my observation at least.

Craig


2715
General Mach Discussion / Re: New guy frustration LOL
« on: April 02, 2019, 07:14:29 PM »
Hi,
I rather think that Gerry has already alluded to the problem, your controller does not conform to Machs
expectation with regards the implementation of G31 probing. You may be required to touch off in Z manually
or buy a controller that does conform.

Craig

2716
Hi,
I must say I always thought that the X an Y coordinates were capable of incremental movement whereas the Z and R coordinates
were not. However the screen shot from the Gcode manual (build3775) certainly shows R and Z as being incremental.

I have a copy of Peter Smid "CNC Programming Handbook, 2nd ed.", often called the "Bible of CNC" and it describes
(page 179) R and Z parameters as being capable of incremental adjustment. It is repeated explicitly at the bottom
of page 180.

Thus we have two references that would indicate that incremental R and Z would work however your experimentation
and the Fanuc reference indicate otherwise. Mach Gcode has always been touted as 'Fanuc like', so much so that it
is often possible to use a Fanuc post and get nearly compliant code for a Mach machine.

Mach4 has progressed with new features and much improved rework of existing features over the last two years
and has outstripped the documentation. It is often negatively commented on but NFS has not the resources to do both.
I think this is another example of that.

Craig

2717
General Mach Discussion / Re: Stepper motors that shudder.
« on: April 02, 2019, 06:43:04 PM »
Hi,

Quote
What is the term for that? Its like a stall

Just 'stall' or 'losing steps'.

Quote
Looking further, with a 5mm pitch it appears I am asking the steppers to run at 400rpm and that seems to be the limit with the torque dropping right off yes?

All stepper motors, irrespective of design drop torque as the speed increases. The principle determinant in how quickly the torque
degrades is the inductance of the motor. The most common specification of a stepper is its holding torque, in your case
425 oz.in. Inexperienced buyers tend to focus of holding torque. Savvy buyers on the other hand look for the inductance
of a motor, the lower the inductance the better because the motor will run faster with less torque degradation.

It may well be that if you bought steppers of the same size (23) and holding torque (425oz.in) but low (less than 2mH)
inductance would handily outperform the steppers you have. It may be also that if you bought lower torque motors,
say 300 oz.in but had really low inductance, 0.8 mH say, they would do better than your more 'powerful' steppers.

Often steppers that have very high holding torque also suffer from high inductance. If you were going to replace them
look for motors of less than 2mH or better still 1mH. If you can't find a specification for inductance or a speed-torque
diagram then walk away, they are being pitched to newcomers, and you are not. If the manufacturer or supplier cannot
supply a spec then they are rubbish.

One way to counteract the negative effect of inductance is to increase the voltage of the driver. Gecko, Leadshine and
other leading manufacturers offer drivers capable of 80V.  Were you to use one of those drivers
and 70-80V power supply your existing steppers would go a lot faster before losing steps.

https://www.geckodrive.com/g203v-digital-step-drive.html
http://www.leadshine.com/productdetail.aspx?type=products&category=stepper-products&producttype=stepper-drives&series=AM&model=AM882

What you have discovered is that your particular steppers with the load of your gantry have borderline sufficient
torque to maintain steps at 400 rpm with your current driver. With either lower inductance steppers and/or higher
voltage drives and power supply you might find you could double or triple that limit.

Its not impossible that the kernel speed of Mach3 is limiting the rate that steps can be taken, but this occurs when you
have made an unrealistic choice of microstepping. Further your description of the symptoms and noise suggest losing
steps not any limitation on the behalf of Mach but rather just the plain loss of torque at speed.

Craig

2718
Mach4 General Discussion / Re: Auto tool zero...manual tool change
« on: April 02, 2019, 02:21:01 PM »
Hi,
there are various examples of toolchanger scripts in:

Mach4Hobby/LuaExamples/Toolchanger

Craig

2719
Mach4 General Discussion / Re: Using the Serial plugin from a macro
« on: April 01, 2019, 09:41:59 PM »
Hi,
one possibility is to rewrite m3, m4 and m5.

Note the deliberate use of lowercase and without leading zeros. That's how the Gcode interpreter treats all Gcode,
mostly M03 still gets treated as m3 but occasionally it does not too! Real tricky fault to find.

As you know there an m3 already built in to Mach, you can't change it. When Mach encounters an m3 (or m4,m5....)
it in the first instance searches in the macro directory of the current profile. If it finds an m3 there that is what it
uses. If not it will search until it finds one. usually the built in m3.

Thus if you write your own m3 that is what will be executed. You need to include all the functionality of the built in m3
PLUS whatever extra fruity bits you want to include. The best place to see what happens within the existing m3 is to look at
the screen button script.

In the screen editor the function associated with the button is:
Code: [Select]
SpinCW()
--local inst = mc.mcGetInstance();
--local sigh = mc.mcSignalGetHandle(inst, mc.OSIG_SPINDLEON);
--local sigState = mc.mcSignalGetState(sigh);
--if (sigState == 1) then
--    mc.mcSpindleSetDirection(inst, 0);
--else
--    mc.mcSpindleSetDirection(inst, 1);
--end

The function is just SpinCW(), all the rest of the code is commented out, its just to give you a sample of
the code the function contains, it is not the function definition itself. The actual function
definition is in the screen load script, approximately line 140:
Code: [Select]
---------------------------------------------------------------
-- Spin CW function.
---------------------------------------------------------------
function SpinCW()
    local sigh = mc.mcSignalGetHandle(inst, mc.OSIG_SPINDLEON);
    local sigState = mc.mcSignalGetState(sigh);
   
    if (sigState == 1) then
        mc.mcSpindleSetDirection(inst, 0);
    else
        mc.mcSpindleSetDirection(inst, 1);
    end
en
So to get your pump running you could modify this code or you could rewrite it including your instructions to get the
pump to run into your own m3() in the macros folder of our profile.

Craig

2720
General Mach Discussion / Re: Mirror probing
« on: April 01, 2019, 08:14:54 PM »
Hi,

Quote
The geometry problems involved in converting the measurements still apply.
I'm curious to know how you would generate G code.

All good questions......we'll have to wait until Don replies and can give us a bit more to go on.

Craig

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