XY Datum Offset

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XY Datum Offset

Postby mezalick » Wed Mar 20, 2019 9:30 am

Greeting All,
I'm just going thru a few items in the software and I realized I've never used the XY Datum Offset....Imagine that.....
So it got me thinking about when and why to use it......
I came up empty..
So my question is, when is it appropriate to use the XY Datum Offset..
I'm sure there are plenty of good reasons otherwise it wouldn't be included in the software..

Looking forward to your ideas.
Thanks in advance.
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Re: XY Datum Offset

Postby TReischl » Wed Mar 20, 2019 1:49 pm

One that comes to mind is that a part you are going to cut already has a hole cut in it. You want to use that hole to set the zero of the program.

Another is that you have a fixture that has a datum hole in it that you use for zero.

I dunno though, in about 12 years of using this software I have never found I needed to use it. ::::shrug:::::

Edit: On the mini mill I have an edge finder that I use quite often to find the center of a hole and then I use that to perform other operations after setting the DRO's. But on the router the spindle is way too fast to use that tool.
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Re: XY Datum Offset

Postby Leo » Wed Mar 20, 2019 2:42 pm

I don't use it either - BUT

It would be a good point to have a "park" position away from the XY zero point so I can load/unload the part with the spindle out of the way.

I often just edit the G-Code to do that for me.
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Re: XY Datum Offset

Postby ger21 » Wed Mar 20, 2019 3:05 pm

I use it with our Morbidelli, which has a backwards Y axis from standard.
I set the Y offset to -49, and make the stock 49" high. This puts zero in the back with negative Y values in the front. I invert the Y values to positive in the post.

EDIT:

While double checking this, I realized that I can get the same thing by selecting back left for the origin and disabling the offset. :shock:
Lots of different ways to do the same thing. :)
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Re: XY Datum Offset

Postby adze_cnc » Wed Mar 20, 2019 5:43 pm

You need to fool the software into believing you have a larger piece of material than you actually have so it will calculate finishing paths properly? https://forum.vectric.com/viewtopic.php?f=2&t=31634&p=228815#p228815

I don't often use it but it does come in handy when it is needed.
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Re: XY Datum Offset

Postby mezalick » Wed Mar 20, 2019 6:56 pm

Thanks Gents..

Steven,
It was your post that I saw that started me on this issue...Thanks for posting it.
Ger21,
Three options for everything I always say..LOL
Leo,
You can park the router by setting the "Home / Start Position" in the material setup window on the toolpath side,,if your PP is setup for it.
TReischl,
That's a good example, thanks


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Re: XY Datum Offset

Postby IslaWW » Wed Mar 20, 2019 9:44 pm

I only use offsets in one way... To provide an intuitive drawing field when designing for my SideWinder CNC Wood lathes.

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Re: XY Datum Offset

Postby mezalick » Wed Mar 20, 2019 10:39 pm

Make Sense Gary,,,,Thanks
~M
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Re: XY Datum Offset

Postby 4DThinker » Thu Mar 21, 2019 11:47 am

I almost alway use it. I set X and Y value to 1/2 the diameter of the bit I'll be using first. Either may need to be a negative value depending on which corner I've chose. What it makes easy is zeroing X and Y by sneaking the bit up to the relative edge of the board until a piece of paper is trapped against the edge by the bit. I'll jog close, then use a .005" step which is also how thick paper often is. I find this much more accurate than trying to zero a bit on the center of a board. You would be surprised by how much off my students can be when asked to mark the center of their boards. When I'm starting a job with a V-bit then I skip the offset and just use the corner. I visually align the tip of the bit with the board corner.

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Re: XY Datum Offset

Postby KeithW » Sat Mar 23, 2019 5:59 am

When I'm starting a job with a V-bit then I skip the offset and just use the corner. I visually align the tip of the bit with the board corner.


I'll do this for any bit. If I need to zero off on the corner or the center, I just slip a v-bit in and center, then put in the bit I'm using and then set the z height. Seems to work as good a any...
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Re: XY Datum Offset

Postby rscrawford » Sat Mar 23, 2019 8:54 pm

When I’m using the cnc to cut on a lathe or an indexer, I want the xy datum to be in the centre of my material set up in the x axis but at the bottom in the y axis. So I choose the xy datum for the bottom left and then offset it half my material width.
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Re: XY Datum Offset

Postby Will Williamson » Thu Mar 28, 2019 4:57 pm

A lot of times, when I get dxf file, from a new client, the file, will import, with that box checked.
If you are not careful, you will over look that check box.
You will soon learn about that offset.
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