Hello Guest it is September 26, 2020, 04:23:50 PM

Author Topic: Change direction of the work area  (Read 4212 times)

0 Members and 1 Guest are viewing this topic.

Offline AGOMA

*
  •  10 10
    • View Profile
Change direction of the work area
« on: August 16, 2016, 03:21:33 AM »
Hi. First post so please be gentle.  ;D
..and please excuse my bad english.

I can not find how to change direction of the work area?

When I run the machine to home pos, it goes to the lower right corner, which is correct.
But when I run a job I have to run to the upper left corner and put zero because the job would go toward + and not -.

Anybody know how to change this?
see attached image.

Many thanks

Offline Tweakie.CNC

*
  • *
  •  8,458 8,458
  • Super Kitty
    • View Profile
    • Tweakie.CNC
Re: Change direction of the work area
« Reply #1 on: August 16, 2016, 03:55:53 AM »
I think you are going to get lots of differing views on this (perhaps controversial) topic.

Whilst the medium to upper range CAD/CAM software allows the home position (X0, Y0) to be in any corner (including centre) the basic CAD/CAM packages generally only allow the home position to be in the bottom left corner.

In my opinion, your machine should be set-up with X0, Y0 in the bottom left corner of the work-piece with +X moving the cutter to the right of the work and +Y moving the cutter to the rear of the work ( Axis direction can be changed by altering the Direction Active Low state in Config. / Ports & Pins / Motor Outputs ).

Tweakie.
KEEP SAFE !

Offline AGOMA

*
  •  10 10
    • View Profile
Re: Change direction of the work area
« Reply #2 on: August 16, 2016, 04:55:26 AM »
Thanx Tweakie for your answer.

humm,  controversial topic?? ???
Is it possible for you to suggest new topic so I can change, it is not meant to offend anyone. this is because my bad English.  :'(

I bought a broken multicam machine that I built for MACH 3.
This has its homing in the lower right corner.
I have been using Sketchup with sketchucam.
When I export gcode after moving the zero point to the other side of the job, it becomes empty in gcode. but I can try to move the home position to the lower left corner, so maybe it will be better.

but if I change the Direction Active Low state in the Config. / Ports & Pins / Motor Outputs. it will be mirrored then?

Many thanks for the reply

Offline Tweakie.CNC

*
  • *
  •  8,458 8,458
  • Super Kitty
    • View Profile
    • Tweakie.CNC
Re: Change direction of the work area
« Reply #3 on: August 16, 2016, 05:41:26 AM »
Absolutely nothing wrong with your English sir - it is just my opinion that the topic is controversial only because many people will have different views regarding the origin and home positions.

Quote
but if I change the Direction Active Low state in the Config. / Ports & Pins / Motor Outputs. it will be mirrored then?

If +X moves the cutter to the right of the workpiece and +Y moves the cutter to the rear of the workpiece then it will not be mirrored.

Tweakie.
KEEP SAFE !

Offline Davek0974

*
  •  2,597 2,597
    • View Profile
    • DD Metal Products Ltd
Re: Change direction of the work area
« Reply #4 on: August 16, 2016, 10:44:35 AM »
On your sketches, both appear wrong to  me - the Y is wrong in the first and the X is wrong in the second - this is of course assuming that machine home would be front-left corner.

The corner it moves to when doing a home does not really matter as it can be set to home on the right but in reality it will place the real home/zero position to the left - read up on home switch offsets ;)

Likewise the home position chosen in CAM does not matter - what DOES matter is that you set the same home point on the material as was chosen in CAM or odd things can happen.
Bridgeport Mill, Mach3 V062, CSMIO-IP/A controller, AC Servo Drives.
Plasma table, Mach3 V062, Step motors, C&CNC THC.

Offline ger21

*
  • *
  •  6,285 6,285
    • View Profile
    • The CNC Woodworker
Re: Change direction of the work area
« Reply #5 on: August 16, 2016, 02:18:53 PM »
As Dave says, you must use a standard right hand coordinate system, which neither of the ones you show are.
Gerry

2010 Screenset
http://www.thecncwoodworker.com/2010.html

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html

Offline AGOMA

*
  •  10 10
    • View Profile
Re: Change direction of the work area
« Reply #6 on: August 16, 2016, 04:26:57 PM »
Hi. Now I got it to work. I and as you say. I was wrong about the coordinates.
Now I home at the front right corner and x+ takes me to the far right and y+ to the left  8)

But I can't get the homing with my slave axis to work.  ???
My slave A axis stops when the X is home. So if The x i not straight I won't compensate for this..

I tried to change to refcombination(9) but not.
Are they any script the home them separately?
Starts at the same time and stops at the sensor?

Thanx  ::)

Offline Davek0974

*
  •  2,597 2,597
    • View Profile
    • DD Metal Products Ltd
Re: Change direction of the work area
« Reply #7 on: August 16, 2016, 04:33:12 PM »
do you have two home switches on the slaved axis - you need one at each side
Bridgeport Mill, Mach3 V062, CSMIO-IP/A controller, AC Servo Drives.
Plasma table, Mach3 V062, Step motors, C&CNC THC.

Offline AGOMA

*
  •  10 10
    • View Profile
Re: Change direction of the work area
« Reply #8 on: August 16, 2016, 04:57:05 PM »
Yes I have one for a and one for x.
They are tested and dedicated in ports and pins.

Offline ger21

*
  • *
  •  6,285 6,285
    • View Profile
    • The CNC Woodworker
Re: Change direction of the work area
« Reply #9 on: August 16, 2016, 09:41:59 PM »
In General Config, make sure that Home Slave with Master is NOT checked.
Gerry

2010 Screenset
http://www.thecncwoodworker.com/2010.html

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html