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Messages - Hood

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20321
As it is a stepper based control you have then it would seem to suggest the drives will take Step/Dir signals which is what Mach puts out, you would need to find out the inputs to your drives. You can either use the parallel port or get something like the SmoothStepper, up to you. Feedback is not used by Mach, you could feed the scales into Mach (if they are ttl) but they will be for monitoring by yourself only. There is a board that rogersmachine.net sell that will take ttl encoders or scales and will monitor the position and fault out if a user set amount of steps are missed.

Hood

20322
General Mach Discussion / Re: Ubuntu and CNC programs.
« on: January 26, 2009, 04:21:54 PM »
Mach3 will not run on Linux you need W2K, XP or dare I say Vista
Hood

20323
General Mach Discussion / Re: run fron here
« on: January 26, 2009, 03:12:28 PM »
Limits are a good thing to have just for a safety point of view, probably with a taig the motors will stall long before anything could be damaged so maybe thats not relevant. Having a home switch however is a good thing, it allows you to home Mach on each restart and means you can accurately go to the same work offset day to day, the accuracy of course would depend on the switches.
 As far as the UK meets, not so far, Graham was trying to organise one last year but I think the expense and health and safety put paid to that. The model exhibition had Brian there last year but not sure if he will be over next one or not.
Hood

20324
General Mach Discussion / Re: run fron here
« on: January 26, 2009, 08:31:56 AM »
If you have the work positioned properly on the table so that it coincides with the programmes coordinates then the Run from Here would be the way to do it. Just scroll through the code to where you want to start then press run from here, it will pop up a prep move box and if the coords look OK then press Start, it will move then press start again once its reached the prep move position and off you go
Hood

20325
Show"N"Tell ( Your Machines) / Re: My Balding Beaver
« on: January 25, 2009, 05:11:24 PM »
Will have to look into that if I am doing anything complex, thanks for the tip.
Hood

20326
General Mach Discussion / Re: Newbie needs HELP with limit switches
« on: January 25, 2009, 01:12:42 PM »
Attach your xml and give us an idea how the limits are wired, their positions and type of switches.
Hood

20327
Simpson,
 yes basically the SmoothStepper is just replacing two parallel ports and actually gives you an extra 6 inputs  on top of that, of which 3 are differential. Another great thing about the SS is that you can use the Index pulse from an encoder for the spindles Index and hopefully soon Greg will get a chance to work on full encoder integration which will tie the spindle and feed together, I think Art mentioned that in the write up but have not reread it in full for a while. The SS puts out a very nice pulse right up to 4MHz and I seem to remember Greg thinking 8MHz would even be possible, but dont quote me on that.
 
Hood

20328
Simpson, the SmoothStepper has been badly named, well not so much badly named but rather unfortunately named as it tends to make people think it is for Stepper Motors only. That is not the case and actually it is servos that can really take adavantage of the SmoothStepper. I have big AC Servos on my lathe and previous to the SmoothStepper I could only get 3.4m/min rapids due to the high encoder count and that was with 1:2 electronic gearing in the drives. Now I can easily get 20m/min, if I dare, with no  electronic gearing,  but have actually settled for 10m/min as 400Kg of saddle flying up to a chuck at faster than that has me a bit frightened ;D I did do a vid of the Lathe doing a job with the parallel port and then I did another with the same job and the SmoothStepper.

Hood

20329
Simpson, below is the writeup Art did, I have put the relevant paragraphs in bold but left the rest so you can see it in context.
Hood


Re: [mach1mach2cnc] Index or Timing?

Hi Guys:

Just to help clear confusion..

The INDEX input takes a one per revolution pulse. IT then calculates the speed
of the spindle from that timing,
and during a thread, calcuates if the timing from rotation to rotation slows. If
for example, the average rotation is 350us
prior to the actual motion of the thread.. ( Average time per rotation is
calculated when the spindle is on and no motion
is in effect ), and during a thread the time of one rotation is found to be
400us, this means that the last rotation took 50us
longer than the standing average ( a 14.28% slowdown) , then the axis motion is
slowed by 14.28% during the next rotation,
this repeats from rotation to rotation to end up with as near a perfect average
time of axis vs spindle rotation speed.

When using the TIMING input instead of the INDEX input, the system looks for
multiple pulses, but in particular looks
for a pulse 50% wider than the others. This 50% wider pulse is then considered
the INDEX, and the system does the
rotation speed calculation only from that pulse for the spiindle speed display.
However, the other pulses are counted, and
the total rotation time is divided by the number of pulses. SO lets say you have
4 pulses, one of which is 50% wider than the
rest. Any threading will begin on the widest pulse as the trigger, but the time
from pulse to pulse will be calculated and
compared to the total average time of rotation divided by the number of pulses.
The system will slow down axis motion to
correct for deviations between the pulses.

So more pulses will not give you a faster DRO update of rotation speed, but in
theory will correct more often for slowed
down rotations. Its been proven however, to have no advantage in the thread.
While a mathmatically theoretical advantage
exists in the multiple slot theory, any advantage gained seems to be lost in the
disadvantage of additional complexity of the
correction. There are several reasons for this internally and in the required
timing and math. My suggestion is to use  INDEX
and not  TIMING as a result. KISS is an important principle here IMO.


The SS is being written to use the INDEX method of timing sync at first, it
will then branch to encoder sync which is much
more exact and allows for things such as stopping a spindle and having a thread
stop and continue when the spindle is restarted.
This really required only a much higher granularity of timing than the PP
driver. TO sync to a encoder in the PP woudl require
the ability to vary the interrupt timer on granularities smaller than the
available 40us ones ( in 25Khz mode). Since the SS has
a 4MHZ maximum granularity, its much more possible to vary timing in smaller
increments thus matching exactly ( pretty much) with the varying encoder count
to count time. It is this granularity issue that guides the threading design in
current Mach3, and forces the consideration as above. By all that I mean if the
system determines a motion must slow to match a spindle, the PP driver has only
the power to create a bresenhamed output timing based on 40us granularity, the
SS could use a sub microsecond timing variation which would be invisable to the
end drivers. Any such correction can be thought of as purposely added jitter to
the output stream, Jitter slows the output stream by the required percentage but
causes a phase shift on the drivers output, so it must be kept low and the PP
driver is limited to 40us pulse to pulse variablity, usually thats much lower
than a driver can effectively see in its resultant phase shift, but in the SS
the timing jitter should be able to be much much smaller and totally invisable
to the driver which is the sought after end effect for a perfect threading sync.
Jitter, often thought to be a problem in pulsing output, is actually used as a
benificial effect in Mach3, and the amount of jitter is tightly controlled to
take advantage of its good effects, and keep it low enough to minimise its
negative effects on the drivers phase timing stability. All digital based output
timing has jitter, its a matter of understanding it and using it effectively. In
threading , Mach3 uses a system of control very similar to Mariss's look forward
trajectory smoothing technique, but it was developed long before that.

End analysis: stay with INDEX when using a PP unless you have some inherent
reason for trying the TIMING input. The theoretical advantages dont outweigh the
mathmatical disadvantages.



Thanks,
Art ( just a user who knows a little bit about timing. :-) )

20330
General Mach Discussion / Re: Introduction
« on: January 25, 2009, 04:17:42 AM »
Welcome aboard, sounds like your skills in your day job will be very useful for your hobby :)

Hood

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