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Mach4 General Discussion / Re: How to use Home offset under mach configuration
« on: October 13, 2017, 06:55:44 PM »
Hi,
that screen shot is of the Homing and Limits page. It is used to reference your machine usually at the beginning of the session. Note that it
sets MACHINE co-ordinates. When you hit <Ref All> the axes will in turn drive in the nominated direction at the nominated speed until a home
switch event for that axis is detected. It will stop and back up a fraction until the switch clears and then zero the MACHINE co-ordinate for that axis.
You will have noted that there is a setting for Home Offset. I don't use it so I could be in error but the upshot is that this setting allows you to say
'my home switch is 2 inches from the end of the axis and I wish my machine to be referenced to the end of the axis'
If you use your laser pointer to reference the machine you could do this.
I suspect what you want to do and is very commonly done is to use your laser pointer to indicate the start point on your work piece. When you hit
a button the WORK co-ordinates are set to 0,0 accommodating the offset of your laser from the spindle. Does that sound like the procedure you want?
There is a section of the forum dedicated to that subject; Video Probing. It is not a thing I have done so I can't really be definitive about it. On the Offsets
page there are a number of possibilities to offset your work 0,0 from the current location. It might be a cheat but how about assigning the radius of your
edge finder to 2 inches. When you hit the Set X button it will set the WORK X to zero but allowing for the fact that your 'edge finder' is two inches away.
That's just one work-around I can see. Check out what others do, there's bound to be better ways.
Craig
that screen shot is of the Homing and Limits page. It is used to reference your machine usually at the beginning of the session. Note that it
sets MACHINE co-ordinates. When you hit <Ref All> the axes will in turn drive in the nominated direction at the nominated speed until a home
switch event for that axis is detected. It will stop and back up a fraction until the switch clears and then zero the MACHINE co-ordinate for that axis.
You will have noted that there is a setting for Home Offset. I don't use it so I could be in error but the upshot is that this setting allows you to say
'my home switch is 2 inches from the end of the axis and I wish my machine to be referenced to the end of the axis'
If you use your laser pointer to reference the machine you could do this.
I suspect what you want to do and is very commonly done is to use your laser pointer to indicate the start point on your work piece. When you hit
a button the WORK co-ordinates are set to 0,0 accommodating the offset of your laser from the spindle. Does that sound like the procedure you want?
There is a section of the forum dedicated to that subject; Video Probing. It is not a thing I have done so I can't really be definitive about it. On the Offsets
page there are a number of possibilities to offset your work 0,0 from the current location. It might be a cheat but how about assigning the radius of your
edge finder to 2 inches. When you hit the Set X button it will set the WORK X to zero but allowing for the fact that your 'edge finder' is two inches away.
That's just one work-around I can see. Check out what others do, there's bound to be better ways.
Craig