Messages about installing and using EMC

jeremy youngs | 16 Jun 2012 01:02

Re: Emc-developers Digest, Vol 74, Issue 9

lots of great stuff guys maybe a little more info and I can come up with a
good solution. My motor is 90v 10 a treadmill 2.5 hp. I have adout 50 irl
540? i will have to check for certain but i think they spec at 100 v and
8-9 a . I was thinking igbt because if i rectify 120 ill get about 160v
which will necessitate hardware i dont have. I also figured that rectifying
line v would be a very easy supply just have to keep it isolated. I also
have some 566 vco that could be used for a to d? There seems to be a lack
of high current pwm circuits out there was why i was thinking of having
lcnc generate the pulse 200 khz seems to me to be plenty fsat enough for
simple spindle drive? I would like to drive this motor at 120 v to get more
power of course i will have to fut a cooling fan or maybe a heatsink on it
also. Again any thoughts would be highly appreciative and thanx in advance.
oooohhhh I gotta go put this thing together !!!!!!!!!!!!!!!!!!!!!!!!
yahoo!!!!!!!!!!!!!!!!
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jeremy youngs | 19 Jun 2012 04:38

Re: Emc-developers Digest, Vol 74, Issue 9

the mill isnt done yet but all the motors and drivers work, well after I
realized my chinese isnt that good !!! A little bit of wiring to tidy up
then on to building mounts and i will be done!!!!!! I thank all those that
have gone before me and to whomever manages this site as I am very
impressed with the software and info thanx
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jeremy youngs | 25 Jun 2012 03:45

Re: Emc-developers Digest, Vol 74, Issue 9

hey guys x and y are on the mill i cant seem to get it to calibrate, one
problem ive found is the love joy connector im using. I will have to ditch
that, i am hoping to get it good enough to build a new set of mounts that
will look and function better.I am confused about the microstep setting i
am using these  http://www.longs-motor.com/ProductsView.asp?id=192 and do
not know what to set it at. I have a 5 tpi leadscrew and it only gets
within .008  of exactly .100 on the axis test. I got it this close by
trying different microsteps i.e .565 etc. This just doesnt seem right to me
? at.008/.100 thats .08 per inch wow!!! how ugly any thoughts? also any
advice on setting the timing? the data for my drive say pulse ,dir with no
spec for dir hold or space. These seem to run pretty slow for me im running
a 24 v supply would 48 be better? also im running a 2.8 intel duocore w/2
gig is this os 64 bit ready? it seems to me that would make a difference in
latency having twice the throughput? sorry so many questions just trying to
get this thing going thanx fellas
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andy pugh | 25 Jun 2012 12:27

Re: Emc-developers Digest, Vol 74, Issue 9

On 25 June 2012 02:45, jeremy youngs <jcyoungs76@...> wrote:

> I have a 5 tpi leadscrew and it only gets
> within .008  of exactly .100 on the axis test. I got it this close by
> trying different microsteps i.e .565 etc. This just doesnt seem right to me

With good reason. Microsteps can only ever be an integer, and is
normally a power of 2 as well.

>  the data for my drive say pulse ,dir with no
> spec for dir hold or space.

With a typical stepconf setup, and any hand-coded setup using "Reset"
the step-space will be what is left over after making the pulse, and
will be more than adequate. It is also very unlikely that you will
have any problems with dir setup and hold timings.

> These seem to run pretty slow for me im running
> a 24 v supply would 48 be better?

Higher voltage will always give higher maximum speed with steppers.
But the drives have to be able to take it.

>  also im running a 2.8 intel duocore w/2
> gig is this os 64 bit ready? it seems to me that would make a difference in
> latency having twice the throughput?

Latency and performance are very different things. The project is
dependent on the RTAI patches and the architectures and kernels  they
are available for. I don't think that includes an x86-64 at the

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