Messages

1

General Mach Discussion / Re: Totally Lost with Offsets.

« on: July 13, 2020, 05:27:39 PM »

I will add my own reply and thank Zastro but I have worked out an even simplet soluition.

I simply park the crosshairs of the usb microscope over the Crosshairs on the pcb etch and on the main screen, touch the x dro and overide the value with the offset and the same with Y. It just accepts its where i want it to be and cracks on. 

2

General Mach Discussion / Re: Offset dont add up

« on: July 13, 2020, 05:26:11 PM »

I will add my own reply and thank Zastro and Tweakie but I have worked out an even simplet soluition.

I simply park the crosshairs of the usb microscope over the Crosshairs on the pcb etch and on the main screen, touch the x dro and overide the value with the offset and the same with Y. It just accepts its where i want it to be and cracks on. 

3

General Mach Discussion / Re: Offset dont add up

« on: July 13, 2020, 09:23:06 AM »

Very Much appreciate you help, been to the page and it is obvious to me that if I am going to become the master like yourself I need to learn to integrate VB scripts into my Mach3. Thanks again. Working my way through your pages after this.

4

General Mach Discussion / Offset dont add up

« on: July 13, 2020, 06:26:49 AM »

Im sorry to have to post this again but I got a super clever answer from one member and that seems to have frightened other off.

I just need to know can this be done with offsets

I need to accurately drill holes in PCB'. I fetted a USB microscope which gets the 0.2mm crosshairs etched on the PCB fill screen.

At this point I zero x and y in G54.

The difference between the crosshairs and actual workpiece zero and the camera crosshairs and the spindle adds up to an offset of -88mm in x and -63mm in y.

So if I simply move the spindle -88 and -63 then rezero in G54 the program performs fine and all the holes drill in place.

But it is a nuisance doing this every time.

I thought if I put the offsets into G55 manually I would be able to bring this offset in after setting x and y to zero in G54, but when I zero the machine coordinates the G54 offsets alter to numbers that make no sence. There seems to be a legacy value from the machines move before zeroing.

If I the switch to G55 the offset is way out and it misses the board completely.

How can moving the head work and changing to G55 not.

How can I either in zeroing the machine coordinates also make the G54 zero so that when I switch to the G55 the new zeros is at the -88 and -63 position.

It seems like whackamole as soon as I alter one offset it moves all the others and the -88 and -66 become corrupted.

Am I just missing the point .

All I want to do is zero in the crosshair. then tell it that really zeros is -88 and -63 from where the spindle is sitting.

Thanks in advance if any of you can help.

I feel like I am in limbo.

Nothing seems to add up.

Best regards

Forbin One

5

General Mach Discussion / Re: Totally Lost with Offsets.

« on: July 11, 2020, 05:53:08 PM »

Is it not possible to do this with simple offsets. ??

6

General Mach Discussion / Re: Totally Lost with Offsets.

« on: July 11, 2020, 05:33:58 PM »

Thanks Zasto, I think i am a long way from understanding what your post says.

Although i have been around mach3 for many years it's like a car to me. I just get in and drive. I still have no knowledge of how to tinker inter the bonnet.

If nothing else is forthcoming I will put the effort into using your information.

But be assured I am very grateful for you efforts.

Many Thanks

ForbinOne.

7

General Mach Discussion / Totally Lost with Offsets.

« on: July 11, 2020, 04:05:41 PM »

I apologise if I am just missing the point. I have watched as many youtubes as i can and it seems simple to me but MACH3 wont obey.

Let me explain. I have used MACH3 to drill PCB's for years by having four phantom holes as part of the etch that then drops onto pegs, worked great machine died of old age. But it releid on me acurately center punching and drilling the first hole which went on a peg.

So enter my new machine two weeks ago to which I have attached a usb Microscope that comes up nicely in Mach3 on windows XP. The Machine a 3 axis router CNC 6040 uses the Bitsensor.com USB controller.

My thinking went like this. Replace the drilled holes with etched crosshairs on the PCB. Clamp the pcb to the bed and the move the head until the crosshairs are over the etched crosshair. Zero the x and y in G54.

Now here comes the rub.

The DRL file in the Gerber list does not use the crosshairs as a zero coordinate it seems to use the edge of the board. So when I then employ my parser written in Vis Basic, I get a series of ready to go G&M code that I then load into mach3.

The difference between the crosshairs and actual workpiece zero and the camera crosshairs and the spindle adds up to an offset of -88mm in x and -63mm in y.

So if I simply move the spindle -88 and -63 then rezero in G54 the program performs fine and all the holes drill in place.

But it is a nuisance doing this every time.

I thought if I put the offsets into G55 manually I would be able to bring this offset in after setting x and y to zero in G54, but when I zero the machine coordinates the G54 offsets alter to numbers that make no sence. There seems to be a legacy value from the machines move before zeroing.

If I the switch to G55 the offset is way out and it misses the board completely.

How can moving the head work and changing to G55 not.

How can I either in zeroing the machine coordinates also make the G54 zero so that when I switch to the G55 the new zeros is at the -88 and -63 position.

It seems like whackamole as soon as I alter one offset it moves all the others and the -88 and -66 become corrupted.

Am I just missing the point .

All I want to do is zero in the crosshair. then tell it that really zeros is -88 and -63 from where the spindle is sitting.

Thanks in advance if any of you can help.

I feel like I am in limbo.

Nothing seems to add up.

Best regards

Forbin One