Machsupport Forum
Third party software and hardware support forums. => SmoothStepper USB => Topic started by: M250cnc on May 04, 2009, 05:00:00 AM
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I have some movement using the MPG
But only forward and it is erratic
The pins on port 3 SS are marked 1 to 6
1 to 3 are inputs
4 to 6 are encoders
So that makes 9 pins numbered 1 to 6 ???
Any other help appreciated in setting the ports and pins correctly on port 3
Thanks
Phil
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you dont need to put it on port3, I have mine on port2. Having said that it should work fine on port 3, I have the buffered outputs from my spindle servo drive on port3. There are two sets of inputs, cant remember which are which but some are differential and the others single ended. That means if you wish to use them for single ended MPG or for that matter just general inputs you will have only six available. The three differential have six terminals a+ a- b+ b- i+ i- if you are just hooking up a single ended encoder/mpg then the - ones dont get used.
Hood
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Hi Hood,
Put it on a standard BOB it works fine
Which for me is a result ::)
Phil
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Here is what doesn't make sense to me
9 pins excluding 5V & Gnd only 6 numbers to go round
Hope you see the pics
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1A, 1B and 1I are inputs 1,2 and 3 on Port3
2A+, 2B+ and 2I+ are inputs 4,5 and 6
2A- 2B- and 2C- are only used if you are connecting a differential encoder or Differential MPG to Port 3. A differential encoder will have A+ A- B+ B- I+ I-, a single ended encoder will only have A B and I
So if your MPG is single ended you just connect to 1A and 1B and then in ports and Pins, MPG page set it up as Port3 Pin1 for A and Port3 Pin2 for B.
Hood
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Sorry Hood you have mad a mistake there.
There is the type that i have which has A, B, 0V & +Vcc ;D
So for dummies like me
A goes to 1A
B goes to 1B
And it would allow a total of 3 of these
1I & 2A = No 2
2B & 2I = No 3
Phil
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yes, if you wanted 3MPGs then you could do that, you could also connect them to any pin on port2 or any of the inputs on Port1 :)
But why would you want 3 MPGs? You related to Brett or something and have extra hands ;D
Hod
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No extra hands but i will have two MPGs so i can use my lathe manually (Sad i know)
I just love to turn the handles
And a index timing pulse for the spindle
It seems to me to be better to put the pulses directly in the SS without going through a BOB
Plus it means i don't need a second BOB which is a Scottish trait coming out. ;D ;D ;D
Phil
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Well I know you cant have any Scots blood in you or you would be ashamed to have that avatar ;D
Hood
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The only Scots I've had in me is Scotch. ;D
Just tried the Mpg works a treat.
Now i just need to get me brains sorted. ;)
Phil
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No comment ;D
Hood
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Phil,
Hope you enjoy the two MPG's as i have just finished mine. They are wired to PP so the info on using the SS was informative. And about using them to do actual machining, well sometimes i just watch the metal being remove under the microscope and tweak as necessary. Mostly used here for fine positioning of the tool to the stock.
RICH
BTW Hood, glad you have been there and done that as you save a lot of folks a lot of time.
This may be the only complement you get today, so cherish it! ;D
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Hi Rich,
I am just playing with all the bits and pieces at the moment in the house where its comfy.
I am/was using a shuttle pro on my mill
Single MPG for that soon
But the MPG route is the way to go. Just spin the dial and the axis moves that amount Fantastic. :) :) :)
Phil
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I just bought a new MPG which is plugged into my computer. everything works except the axis motions, there are 3 settings on the built-in MPG you have con. step and MPG, how do I activate the MPG? I thought I could plug it to my control box for my CNC but both have female plugs. Can I use a gender-bender adapter or would it be a mistake?