reading Pokeys pins

[ArtF]

Gary:

  Great!, sounds like your about there. Spindle should be fine.

  >>Is the spindle index, i'm not sure how you would connect it up with auggie  the pokeys doc's say it on pin 13 of the ultra fast encoder.. .

  Are you looking to use the index for speed calculations? Mach4 may use it for constant speed PID
loop or something, but other than perhaps a speed indication Im not so sure its usefull in
Auggie. I think the pokeys has a hi-speed counter or a high speed encoder input you could use
and sample it periodically for a count, divide by time passed and youd get a fairly accurate
indication of speed.
  I havent used any index in the pokeys , I havent had a use for it, but if you can figure
out how to count it on the pokeys, you can likely get the information by script. Your right
about the index being too fast for Auggie to do anything with , it only converses with
the pokeys a hundred times a second or so.
  Spindle feedback, unless its for pid correction I never saw as being very usefull for
my own use. Let me know if you need any methods to read a count or anything, Im
pretty sure their all there though perhaps not doc'ed..

Glad to see things are coming along..just remember, use caution, I havent used the
program for much cnc , just laser. Your cutting new ground,but it was designed
to run near anything really..


Art

[gburk]

Art

My Thought is so I can see what RPM the spindle is turning and if I can read it close enough and compare it to want I want it to a just the current to correct the speed if possible, probably not or find a way to sink the two correct current to entered RPM..

Make any sense, wasn't sure if you may have the code already built into auggie…

Maybe just a way to display the RPM using the sensor..

Thanks You have been a great help and not getting to frustrated  with me

one thing before I forget where you able to check why the m6 runs when I boot g code the g code never moves past the first line but the m6 is running moving the z to 1.0 which is what I have in the script hit run now and it runs ok stops as it should at m6..
I motioned this a while a go and forgot about it..

Gary   

[ArtF]

Gary:

  I think Ive fixed the script running during load but it may not be in your version.
Ill try to get a version out this week.

  You may be able to hook up the encoder of the spindle up to the
hispeed encoder input on the Pokeys, reading that will probably give a number we
can use to compute a speed approximation..

Art

[gburk]

art

When I made the BOB for my pokeys I have it with all ribbon cables in and screw terms out except for the homing and encoder those are the opposite's screw term in and ribbon out to the pokeys make sense to you if not I can try and post a pic of the board,

any way I have the index already on the board running to pin 13 of the encoder in pokeys and wire 7 of the of the encoder cable..

I just would need to know how to read it, thats way above my pay grade

I tested the relays on the mill and the flood and spindle power up great, so next I will check the spindle speed and see if I can get it moving it should work getting good voltage changes from the 0-10v output, will let you know how that gos..

thanks gary 

[ArtF]

Gary:

  Try as I might I cant find any way to read just an index and figure out speed.
There is no way it would be read fast enough by Auggie to know anything about speed.
In theory one could use such a signal to move the spindle until it stops on index..in other
words to use the index as a homing signal of sorts, but for counting speed its useless
unless the entire encoder is hooked up so that a count may be taken. Now if you hooked
the index instead to a connector pin that can be used as a counter you could at least count
the index pulses, so that dividing by time would give a good approximation of
actual speed. I cannot think of any way to use just an index signal though.. they are very short
and cannot be read by anything at any reliable speed.
  Im not sure how M4 could count speed with the index.. or mach3...

Art

[gburk]

Art

I'm not sure how mach3 or 4 do it haven't tried it with the pokeys yet, have read some messages that people have got it working..

I do have it working with the smoothstepper in both mach3 and 4 not sure if mach3 or 4 are taking care of it or the plugin's is doing the work..
but with the smoothstepper I am using a c3 index board from cnc4pc and just using any input pin.. and set that pin to index in the config..

not sure if auggie could handle the c3 board and set an input pin to whatever pin #, kind of like we did with the probe input pin 19..
and check that pin constantly..

make sense?

Thanks gary

[ArtF]

Hi Gary:

    I suspect neither program will use it. The smoothstepper is likely feeding
it into a counter and then sending  a calculated value to its plugin. There is
no way to monitor such a signal, its very short and can at up to 20Khz,
so the CPU couldnt do anything else but check it. Auggie only converses with
the pokeys around 100 times a second, hundreds of index's would have
happened between each conversation, so other than counting the index,
the signal has no use in that context. Its real use is to sync for threading
and such but for spindle speed its pretty much useless.

  Ive never used a c3 board so Im unsure what the hookup would be to that.
Ill do some reading..

Art

[ArtF]

Gary:

YEs, just finished reading up on the c3, while it can take the index signal and send it to
a printer port, where mach3 could read it for example, or where a smoothstepper can
read and process it, the pokeys has no built in component to handle a count such as
that as far as I know. I think Mach4 is the same, its useful depending on the plugin.

Art

[gburk]

Art

I do have an encoder but haven't connected it up yet was going to use on lathe for threading, down the road a bit..

I hooked things up be messed up a bit hat the relays wire though the ssr output's and couldn't figure why they were not tripping dumb move..

But rewired for the onboard relays to my spindle and flood relays so will see it that's works better..

Also for the life of me I can't figure out why the pokeys enclosure is hot, it seems to have power running though the case, it doesn't show up in the house not connected to the mill, but i found out when i was going to plug in one of the home or probe plugs and i dropped it and the ground shield hit the corner of the case and sparked like crazy not sure why.. if i use my volt meter to the case and other end to mill table it shows 120volts.. but i never got shocked
Hoping someone will read this and maybe have some advise..

Thanks gary

[ArtF]

Gary:

  Sounds like maybe a grounding issue somewhere? What happens if you ground the case to the mill?
(Id hook a light bulb between the two myself to see if current flows..if not, its likely you should
add some grounds.)

Art