developing a stepper with encoder config

This continues zig's offer of testing a sample config (check out feature requests)


So a basic XYZ METRIC machine.
Leadscrews are 5 mm pitch.
Servo motors are directly coupled to the screws.
Linear scale has a basic resolution of 20 micron but in quadrature mode the resolution is 5 micron.
The reader head on the scale outputs an Index pulse for homing as well as an end of travel flag ( a single flag for both positive and negative limits).

Zig what is the stepper drive timings?

here is the basic config files.
stepper timing is not set and PID settings will need to be adjusted.
I didn't add the joystick jogging feature - that can be added later.
I assume the drive steps one step per encoder count.
If you read the read_me that should help with what the connector / pins are.
Check it out to see if there are any obvious thing you would like to changed.
for instance the input / output could be different or moved to different positions.

maybe this is easier:

Apologies have been away..

Chris,

Back on task.

Going through the readme file and looking at pin assignments:

MESA connector 4 pins #20,21 and 22are labeled home-z , home-x and home -y I take it these are home signal inputs.

However...

MESA connector 2 pins #4,5 and 16 are labeled x-encoder-i, y-encoder-i and z-encoder-i index signal inputs used as homing signal inputs by hostmot2 .

What is the difference between these two groups of pins?

attachment problems again...



file is a zipped up pdf file.. renamed to jpg so as to may be fool the software to accept a file 128K large


EDIT : no joy in transmitting the large zip file

the home switch eg home-x is for actual switches.
Usually these are course position switches used with rotary encoders since they have an index pulse every rotation and you need to let EMC know when your close.
The x encoder index is from the encoder for precise home position.
But I guess in your situation you don't need the home-x course switch inputs as you have only one index for home.

Chris,

Thanks. I am just going through the design of the interface card which will interface the drivers and Mesa card.

Unfortunately the Zipped up PDF containing the schematic is at 127K .. just a bit too large for the gate to squeeze through.

Ok,

Based on previous explanation a circuit reduction has occured whihc now makes for a smaller sipped up pdf .