Messages

1

General Mach Discussion / Re: microsteps should not be included in resolution calculations

« on: April 06, 2008, 09:39:38 AM »

Ian

Don't be too careful what you say...

If you hadn't made your original comment, I would still be wasting hours trying to solve a problem that in fact is not a problem but a 'feature'! 

John

2

General Mach Discussion / Re: microsteps should not be included in resolution calculations

« on: April 06, 2008, 05:48:24 AM »

Thanks All

We all have different ways of understanding things and one of the joys of this forum (at least to me) is that several people explain the same thing in different ways and taking a bit from here and a bit from there brings light to my darkness.

All makes a lot more sense now!

One remaining question...

Will the motor stop on a micro step or is it always stopped on a full step?

Thanks
John

3

General Mach Discussion / Re: microsteps should not be included in resolution calculations

« on: April 04, 2008, 07:50:38 PM »

Thanks Chip,

I understand the steps per unit calculation, it was the comment about micro steps being different sizes that I was seeking clarification on 

The implication is that if Mach tells the motor to move a certain number of micro steps, the actual distance moved by the table may not be as simple as  I thought!

John

4

General Mach Discussion / microsteps should not be included in resolution calculations

« on: April 04, 2008, 04:59:39 PM »

Hi

Stirling said in recent thread...'microsteps should not be included in resolution calculations  because they can't be relied upon to be equal in size'

Am I understanding this right & could someone (Stirling ?) expand for me

Mach set to 400 steps per mm
Jog increment 0.01 mm
Jog mode step
So each '0.01 jog' would be 4 micro steps

Does Stirling's statement mean that on one jog the table might move 0.01, on the next 0.015 and the next 0.05 ?

Or have I totally misunderstood ?

If so...
  Is there a regular pattern to this, or is it random ?
  Would it average out over several jogs ?

Many Thanks

John