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Messages - joeaverage

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2441
Hi Gerry,
I recall being confused by this at the time this thread was current.

I seem to recall coming to the conclusion that there is 131,072 lines and therefore with quadrature 524288
counts per rev. In effect the encoder count is synthesized from this potential. If memory serves the default
configuration is 10,000 count per rev. So for all the extra resolution which the servo is capable is discarded,
which is still 2.16 arc min.....plenty fine enough for me.

The problem that OP had here, aside from not understanding electronic gearing, was that he was using a 'Canadian
made SmoothStepper'.......bulls*********t.......a Chinese made rip-off of a SmoothStepper. I recall being bemused that this
guy had spent big dollars to get four 750W servos and drives, huge overkill for a hobby machine, and yet wouldn't spend
$180 to get a genuine Ethernet SmoothStepper to actually get the best out of them.

Craig

2442
General Mach Discussion / Re: Need help with AKZ250 BOB..
« on: June 05, 2019, 04:23:47 AM »
Hi,
Mach can handle lots of inputs, it was the parallel port that was limited.

I am not a fan of Chinese made controllers, I would recommend a better quality and much MUCH better supported controller
like an Ethernet SmoothStepper, a UC300, a 57CNC or similar, all US or European brands.

Note also that an Ethernet connected controller is likely to be more immune to noise.

Craig

2443
Mach4 General Discussion / Re: floating point information
« on: June 04, 2019, 03:48:39 AM »
Hi,
I think its possible.

What I have done is create a register that has a floating point value. I have a short macro to read the value and then
covert it to a string to display in a message box. Note that the displayed value is correct and that indicates that Machs
core correctly read and interpreted the float value.

Code: [Select]
function m115()
local inst=mc.mcGetInstance()
local hreg=mc.mcRegGetHandle(inst,'iRegs0/floatTrialReg')
local value=mc.mcRegGetValue(hreg)
wx.wxMessageBox(tostring(value))

end
if (mc.mcInEditor()==1)then
m115()
end

Craig

2444
General Mach Discussion / Re: Motors stalling /growling
« on: June 04, 2019, 03:04:39 AM »
Hi,
I presume that you must be using a breakout board with the ESS? Is it the same breakout board that you used previously
when trying to get the parallel port to run?

The pulse streams to your motor drivers are generated within the FPGA of the ESS. I think you can rest assured that the
ESS is generating high quality pulse streams.

The problem therefore must be in those components that remain, namely the breakout board and the drivers. Do you have
or have access to an oscilloscope?

When you are running your machine you say it runs OK when jogging but fails with Gcode? Have you tried MDI instructions?

Craig

2445
Mach4 General Discussion / Re: Mach4, Esc key to stop program running
« on: June 02, 2019, 05:13:47 PM »
Hi,
yes that can be done.

Daz's video shows the workaround:

https://www.machsupport.com/forum/index.php?topic=31585.0

Craig

2446
General Mach Discussion / Re: Constant Torque vs. Varaible Torque VFD
« on: June 01, 2019, 04:36:12 PM »
Hi,
Hitachi VFD's are available in the US and have a good reputation.

There are lots of Chinese brands, many of them questionable but Delta and Teco (actually Taiwanese) are both
very good, both easily the match of any Japanese/USA/European brands.

It is a questionable practice to use ordinary 3 phase motors with VFD's. VFD's by necessity generate, or rather synthesize
the required variable frequency output by switching (in a PWM manner) a high DC voltage very rapidly, usually 9-20kHz.
The high speed switching causes voltage spikes within the motor. As a consequence the insulation between windings and
between windings and the metal part of the stator come under stress.

A motor intended for such service is called 'Inverter Ready', it is in most respects just an ordinary motor but with beefed
up insulation.

I had a cheap Indian made 3 phase 1 hp motor given to me and I used it as a motor for a grinder with a VFD. It didn't
last, after about three months the insulation let go. I am now using a GEC (US made) 3 phase motor and its been running for
five years. I can only guess that the insulation in the GEC motor is that much better.

If your motor is good quality it should be fine but if its a cheap one then using a VFD might be a bit chancy.

My GEC is a 'two pole pair' motor, and its synchronous speed in New Zealand with 50Hz AC supply is 1500 rpm. The same
motor in the US with 60Hz supply would have a synchronous speed of 1800 rpm. Naturally being induction motors there must
be some slip so the motor will never achieve synchronous speed but rather 1425 rpm or 1725 rpm respectively.

I guessed that GEC would have used the same rotor in their 'one pole pair' design stator, that is to say that the rotor
could handle rotational speeds of 3000 rpm and 3600 rpm depending on the frequency of the supply. I guessed that I could
with a VFD spin them a little faster WITHOUT the rotor flying apart. I have taken the GEC to 4500 rpm but got nervous and backed
it off to my now self imposed limit of 4000 rpm.

Note that with my Delta VFD which is capable of 400 Hz output I could with the 'two pole pair' motor run the motor up to
12000 rpm. I would expect either the bearings or the rotor to explode long before I got to that speed though.
Just because its possible to get a lot more speed from a motor, and incidentally more power, does not mean that it a good
idea.....you could compromise reliability.

Craig

2447
General Mach Discussion / Re: treadmill motor for spindle
« on: May 31, 2019, 05:11:14 AM »
Hi,

Quote
Would I need a special controller? what about the the controller that
comes with the treadmill?

I don't know what the controller inside a treadmill is.

When a motor, of any description, is used as a spindle it comes under stress due to sharp and sudden variations in speed
which are related to cutting and accel/deccel. High accelerations means high currents. Where many controllers fall down
is when the motor overruns and starts generating back into the controller, its a fact of physics and can't be avoided.

The KB controllers I have seen are off-line phase controlled bridges and are pretty robust.

That's not to say that rectifier/DC link/Buck regulator designs cannot do the job, but rather the design needs to be good
to match off-line phase controlled bridges. A well designed and built rectifier/DC link/Buck regulator controller is likely
to be as expensive as a KB unit.

Craig

2448
General Mach Discussion / Re: treadmill motor for spindle
« on: May 31, 2019, 03:20:59 AM »
Hi,
my understanding is that they are brushed DC motors and quite useful.

You will need a robust DC controller.....in the US the 'KB' brand is well known and respected. Don't be tempted to by cheap
rubbish, it wont last.

Craig

2449
Hi,
you have assigned inputs to match the pendant in the Hicon plugin and those inputs can be active high or active low.

Craig

2450
Hi,
change the input associated with the enable button from active high (or low ) to active low (or high) in either (only one)
plugin, either Mach4 Control or the Hicon plugin. It has the same effect as wiring the switch closed.

Craig

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