Drilling operation creates offset

[Anonymous]

I am very new to CNC stuff and tried to find an issue like this in the forum but couldn't find this one. Hopefully I'm not duplicating?

I'm doing a very simple drilling operation. Looking at the simulation on 360, everything looks good. When I go to drill the holes, one hole is in the correct position and one hole is in the wrong position. In this instance I am only drilling 2 holes. Looking at ncStudio simulation I can see the hole is also being drilled in the wrong location.

If I do an operation that drills more than one hole, all holes are ok but inevitably there is one hole that is drilled in the wrong location.

I am using a 3 axis milling machine with ncStudio and am post processing as a gplus (Generic GPlus file).

The milling operations look ok its just the drill operation I am having problems with at the moment. I dont think its a positioning error as I can run multiple operations using different files and all operations line up nicely. The only operation I am having problems with is the drilling.

Any help appreciated.

[HughesTooling]

Can export the file as an f3d and attach to this thread and the nc file you might need to change the extension for the nc file to txt.

Thanks Mark

[Laurens-3DTechDraw]

Hello,

It's hard to make a judgement on what is happening.

So to help you best:

Could you add the link to your part on A360? Or attach it here?

And the NC-file.

And what hole goes wrong and what the location is on the machine?

[Anonymous]

Thanks for your help, the link is http://a360.co/1XNSD9V

One of the holes in this example is correct on the x axis but incorrect on the y axis. It is the hole closest to the viewer when in home view. I will try and post the nc file shortly.

[Anonymous]

nc file attached. I will be very interested to see what I am doing wrong here. I have had this problem before and not been able to figure it out.

[HughesTooling]

Checking your code against the file shows the code is correct

One thing I noticed is line N32 doesn't have a Y value, this shouldn't matter as long as your machine is OK with modal moves. Which hole is drilled out of place?

Mark

[Anonymous]

I just did another test run and based on the image you posted, it is the hole on the left . Running the simulation in Fusion seems to be ok, it sounds more like ncStudio is mis interpreting something.

[HughesTooling]

Try editing line N32 to read N32 G0 X3.199 Y18.349 so you have both coordinates.

Mark

Edit don't add the G0, I used copy paste and forgot to remove it. It'll probably work either way but we don't want to add more confusion.

[Anonymous]

I was looking at the ncStudio user manual and it looks like it should support modal moves. Then again my CNC is a very cheap Chinese system!

https://docs.google.com/file/d/0B26SgTyDJ3GNOWdrNzMzMVRGQlE/preview?pli=1

Is there a way in Fusion360 to disable modal moves to see what happens?

[Laurens-3DTechDraw]

That would be a small Post processor edit.

Which post processor are you using?

[Anonymous]

I'm using gplus.cps -Generic GPlus

[Laurens-3DTechDraw]

Please find the editted version attached.

It will output X and Y for every drill point.

To qoute @HughesTooling:

"If you have a custom post you should save to either the Personal posts folder or enable cloud libraries and store on the cloud. See this post for info on cloud libraries and A360."

[Anonymous]

That is absolutely brilliant. Thanks. This problem has plagued me for a while so I am looking forward to trying this out.

[HughesTooling]

I seem to remember reading somewhere for one of my controls the first point for a drill op needed X and Y cords but after the first they could be modal.

Mark

[Anonymous]

Thanks Mark, I will look into that.