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Messages - joeaverage

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681
Hi,

Quote
"3.) The UC100 works with the UCCNC, Mach3 and Mach4. The UC100 does
> not support thread cutting with Mach4. It supports thread cutting with
> index sensor with Mach3 and it supports syncronous thread cutting with
> encoder feedback with the UCCNC."

Kool, there was a period of some years where CNCDrive products did not support lathe threading at all (Mach3/4 or UCCCNC).
Clearly this situation has improved somewhat.

Given that the UC100 does support threading then John's guess about the UC100/BoB not recognising the pulse input is very likely correct.
If you can get the UC100 to signal Mach the exact spindle speed then lathe threading probably follows easily.

Craig

682
Hi,
US made Gecko drivers have the best reputation but aren't cheap. There are plenty of 80VDC capable Chinese made drivers, still more expensive
than the one you linked to but cheaper than Geckos, and still pretty damned good. At 80VDC you've left all the newbie types well behind, and all that's
left are those which are credible to savvy buyers.

Looking on Ebay, most of the drivers are now AC input, that is that they have a rectifier and smoothing caps inside, even easier. This one is for 80VAC or 110VDC, that would
really make your steppers sing.

https://www.ebay.com/itm/125187084348?hash=item1d25bb503c:g:GAYAAOSwr61iJmKY

Still can't help but think that you need to start at the motion controller, not only is that more expensive than the drivers its also the much more important choice that
will determine your CNC success or otherwise for years to come. Drivers can be replaced at any time, although if you buy well you'll never need to replace them, so there
is some value in getting the 'right' ones first time but its less important than getting the 'right' motion control solution.

Craig

683
Hi,
the stepper driver is only capable of 42V, and 42V is a joke. The TB6600 IC is prone to going bang. Aim for a driver that can handle 80VDC, even if you don't use it all, I can guarantee that you'll
want as much voltage as you can get when you get your machine running.

The controller you pictured is just another parallel port breakout board. Are you really sure that you want to stick with all the quirks/faults of a parallel port?
If you buy an external motion controller like an Ethernet SmoothStepper, or a UC300 or a 57CNC then you could use  Windows 7/8/10/11 and 64 bit or 32 bit,  laptop or desktop,
and still run vastly smoother and faster than a parallel port can ever run. The parallel port is not just 'last decade' it's..... 'last century', if you want good results
get an external motion controller, and not some cheap/crappy Chinese rubbish either.

If you insist on using a parallel port run run DriverTest.exe and report the results . By the way 'execllent' or 'good' is not a report, we need to know the timing jitter
and your selected kernel speed. If the timing jitter is as much as 10% of the kernel period you are in for a battle.

Craig

684
Hi,
if I'm not mistaken none of the CNCDrive motion control boards (UC100, UC300,UC400) support single point lathe threading.
In order to synchronise the start of the thread the motion controller must do it. The communication delays (controller to Mach, Mach makes up it mind, Mach to controller plus buffer delay)
are such that Mach is not fast enough to synchronise the start of a thread, whereas the motion controller is.

Mach's parallel port can do it, if somewhat less precise. An Ethernet Smoothstepper, a PoKeys 57CNC, a Vital Systems Hicon or a CSMIO can all do lathe threading. Of them I use
an Ethernet SmoothStepper, although not for lathe threading.

Craig

685
General Mach Discussion / Re: SCHP vs Hardware Disable E-Stop
« on: June 12, 2022, 11:15:54 PM »
Hi,
I've never bothered with a charge pump....ever, not when I used Mach3 and parallel ports, nor Mach4 and an ESS.

The idea was that with a parallel port it was possible some outputs were active even before Mach had powered up and started to run. The charge pump was to stop those
inadvertently active outputs from causing movement or the spindle running, for safety.

If you are careful about your use of ESS and the breakout board there should be NO active outputs unless and until Mach is active and running, and therefore the
charge pump achieves nothing. I have always been careful to design my machines such that as the machine is powering up, but before Mach is up and running and in charge
the machine does not move nor any equipment like the spindle or pumps run.

An Estop is an emergency stop for whatever reason. If you stopped Mach then the charge pump would, after a few hundred milliseconds, stop and therefore the machine would stop.
To my mind  a few hundred millisecond is too slow, an Estop should be immediate. For an Estop a software and/or hardware Estop is required.

Good machine design renders a charge pump obsolete.

Craig

686
Hi,
yes it is a good article. Microstepping was first proposed by astronomers trying to get better resolution, but as described beyond halfstepping does not result
in reliable increase in resolution, but what it does provide is smooth motion. That the astronomers did appreciate and still use. Regular fullstepping, and halfstepping result in to much
vibration which was upsetting the telescopes after each step. Microstepping reduces that big time.

Craig

687
Mach4 General Discussion / Re: Mach4 bug - or by design????
« on: June 04, 2022, 01:50:18 AM »
Hi,
the default behavior of Mach4 as it ships is for the DRO to display the  current applied jog speed, the number internal to Mach4.
Just because you edit the DRO DOES NOT Change the applied jog speed. If you want the DRO to display a different value then address the issue of changing
the applied jog speed, and the DRO will display it.

There are a number of DROs where if you manually edit the value  that value will be 'pushed' onto that property within Mach, this is not one of them.

Craig

688
Mach4 General Discussion / Re: LUA issue operating system command
« on: May 30, 2022, 07:52:40 PM »
Hi,
you really like to to tackle the hard stuff don't you?

https://www.lua.org/manual/5.3/manual.html#6.9

Code: [Select]
os.execute ([command])
This function is equivalent to the ISO C function system. It passes command to be executed by an operating system shell. Its first result is true if the command terminated successfully, or nil otherwise. After this first result the function returns a string plus a number, as follows:

"exit": the command terminated normally; the following number is the exit status of the command.
"signal": the command was terminated by a signal; the following number is the signal that terminated the command.
When called without a command, os.execute returns a boolean that is true if a shell is available.

Craig

689
Mach4 General Discussion / Re: live feed
« on: May 26, 2022, 07:52:53 PM »
Hi,
Mach4, like Mach3 that preceeds it run on Windows platforms, and Windows is not nor is ever likely to be realtime.

Windows uses the interrupt system VERY extensively for its own purposes and therefore any application, Mach4 say, cannot be realtime because
Windows has priority. Mach4 is a buffered control solution. With a well sorted and powerful PC you might get the buffering time down to 20-30 milliseconds,
but still there is a delay.

When you say you want realtime performance....what do you mean?. Could your control strategy accommodate delays of this magnitude?

You might be advised to investigate LinuxCNC. The current Linux distro that is used is Debian with Realtime Pre-empt Kernel. Any reasonable PC should be able
to manage 5usec jitter....would that be fast enough?

Craig

690
Mach4 General Discussion / Re: Z axis problem - Fusion 360 to mach4
« on: May 24, 2022, 09:26:23 PM »
Hi,
Iv'e been using Fusion for two years with the Autodesk supplied Mach4 Post and I have not had issues like that.

Can you expand a little further and excerpt the Gcode that is at fault?

Craig

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