Delta movement conventions - ANSWERED

To all the Delta gurus....

Running a little confused on expected X-Y movement, so as per the attached image

If tower C = Z
A = ??
B = ??

If X movement is 1-2 and Y movement is 3-4
Then which is the minus and plus directions?

Cheers
Phil

IGNORE the attachment in this post, Diagram attached by PRZ shows the movement conventions.

Edited 1 time(s). Last edit at 05/18/2016 08:31PM by aussiephil.

A=Y
B=X



Both axis are minus to the Front Left and positive at Rear right.

HTH

Edit to correct Brain Fade moment

Edited 1 time(s). Last edit at 05/18/2016 02:34AM by dougal1957.

Doug:

Ok, swapped my left right towers as i had them wired the other way, now have X moving positive to the right and negative to the left with the Z tower at the rear.
All homing works.

Now the Y directions is different to what you posted above with positive going to the rear. This is inline with other posts I could find this evening including one by yourself

Now just want to confirm Y though i can't see it could be any other way if all the other movement is correct.

I'll double check on mine and report back in about 15 mins

You are quite right that's what you get trying to do things from an ageing memory

So to get it right both axis are Positive at Rear Right and negative at front Left.

I'm getting to old and demented to do things by memory? Note to self Double check what you post before hitting the Send button Doh?

Quote
dougal1957
You are quite right that's what you get trying to do things from an ageing memory

So to get it right both axis are Positive at Rear Right and negative at front Left.

I'm getting to old and demented to do things by memory? Note to self Double check what you post before hitting the Send button Doh?

no dramas I got it sorted but it could be worth editing your first reply to avoid confusion down the track to others.

Cheers and thanks for checking
Phil

Quote
dougal1957


In other words both axis are minus to the Rear Left and positive at front right.

HTH

The correct convention is both axes are minus in the FRONT left and positive in the REAR Right


...ohh sorry see this has already been corrected

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I have added a schematic on the wiki Delta geometry page. View from top.
Delta_geometry#Delta_columns_and_axis_names [reprap.org]

AussiePhil, I found that in Repetier the A and B column names are reverted compared to your drawing, see [www.repetier.com] , where did you get it ?

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Hi Pierre

Many thanks for adding that to the Wiki, I'm good at Google searching for info but never found that diagram.

I'm trying very hard to learn by research and only ask when I just can't find it or understand.

The diagram I posted I just drew and just nominally put letters to the to front columns.

Cheers
Phil