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tangential knife rotation problem
« on: July 15, 2012, 06:55:41 AM »
Hi all

  I am seeking help with a problem about rotating a knife.

I have set up a 4th axis with the A axis rotating around the Z axis.
my table coordinates are such as X0 and Y0 axis are to the left hand corner.

I am using NC PLOT as post processor and when I run the generated program the knife rotates correctly in the X++ and X-- direction but is reversed in the Y++ and Y--direction .

Have also tied CamBam demo and same thing occurs.

Have searched this Forum and others but cannot find any info as to why this occurs.

some inner thoughts !!!

If the dxf file imported into NC Plot or any other PP has the coordinates X0 and Y0 not in the lower left hand corner as in my machine, but the X0 is as my machine Coordinate (left hand lower) but Y axis is in Right hand lower corner

Could this be the problem ?

If so can a Mach3 setting in config overcome this ??

have tried changing  configs etc in Mach3 but  does not overcome problem.


many thanks for your help I hope!!

ET

Offline Tweakie.CNC

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Re: tangential knife rotation problem
« Reply #1 on: July 15, 2012, 07:14:46 AM »
Hi ET,

Try changing the 'Dir LowActive' state in Config / Ports & Pins / Motor Outputs for your A Axis.

Tweakie.
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.
Re: tangential knife rotation problem
« Reply #2 on: July 15, 2012, 10:17:48 AM »
thanks Tweakle

will try, but would this also change the X axis as well ??
If I program a straight line cut say X100 to X200 and then X200 to X100 the knife goes in the correct plane,(direction)

if I program a line say Y100 to Y200 and then back again the knife works in the wrong plane.

Thats what happens when I try to aircut a square.

Will try tommorrow,  its 10.15 pm here in West Australia and post a reply.

Thanks ET




Offline Tweakie.CNC

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Re: tangential knife rotation problem
« Reply #3 on: July 15, 2012, 11:49:35 AM »
Hi ET,

No, it will not affect the X Axis - it just changes the direction of rotation of the A Axis stepper motor.

Tweakie.
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.

Offline BR549

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Re: tangential knife rotation problem
« Reply #4 on: July 15, 2012, 01:00:01 PM »
opps Tweaky may be right.
« Last Edit: July 15, 2012, 01:03:42 PM by BR549 »

Offline Tweakie.CNC

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Re: tangential knife rotation problem
« Reply #5 on: July 16, 2012, 01:00:33 AM »
 ;D

Tweakie.
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.
Re: tangential knife rotation problem
« Reply #6 on: July 16, 2012, 01:49:56 AM »
Tweakie.

U were rite,  works perfectly now thanks should have asked you days ago
might be back with another couple of Ques'

and yes BR
Many thanks
ET

Offline Tweakie.CNC

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Re: tangential knife rotation problem
« Reply #7 on: July 16, 2012, 02:05:36 AM »
Hi ET,

I am pleased that you have got it sorted.

Tweakie.
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.