How on earth do I make this!!!

[disinformation]

Ok, I am fairly new to programming G Code however I am getting it now a bit better. I am now onto programming the C axis and have got both the x and c working together, but at the moment I can only get the two working together at the same feed rate etc so cannot produce the shape I have attached that I need to.

The machine I am using is a matrix Churchill two series which is fitted with a fanuc-ot series controller.

Basically i need to know if there is a way to make the shape I am tryng to using the C axis feeding at a certain rate and the x axis feeding independant of it rather than at the same time and rate. I am sure there is I just have not got it yet!

Help please

Thanks people!

Francis

FVF Custom Drums
www.fvfdrums.co.uk

[InspirationTool]

Uh, C axis? This is a straightforward part on a mill, at least when you figure out how to hold the part.

I guess I'm not understanding what you are asking.

-Jeff

[disinformation]

sorry did not explain.

I am trying to make this on a 3 axis cnc lathe! I dont have access to a mill.

Apologies I should have explained better.

Thanks

Francis

[FarmerDK]

You're looking for some kind of interpolation. Did pieces like that on a fanuc lathe, but cant remember it exactly. Isnt there some kind of manual to consult ?
Sry for my RTFM post

[chop5280]

You need to do a plane selection to get the feeds to work independently, if i was at work i have notes on it but sorry not much more help from home. But it can definetly be done.

[wjbzone]

Just playing around with it using CAD to manually program.

(assuming a 25.4 dia tool)
Draw an arc (R37.31) offset by the tool radius (50-12.69=37.31)
Set your tool at first point 50 from center (C1=50). Rotate part from intersection of C1 and R37.31 to center of tool

move tool in X by -1 (or whatever increment you want to use)
draw C2=49. rotate your part from intersection of C2 and part to new center of tool.

I think you can get the X and C angle from this process. Might take some time. I am sure a formula can be set up to do it.

Bill

[disinformation]

Thanks people really appreciate the help now just got to figure it out in my head . So it is possible to run the feeds at independant rates then I gather from all this as I am sure this part cannot be made on this machine any other way.

Cheers

Francis

[CNCRim]

You can G12.1(G112) to interpolation.... as far as feedrate concern, you can put appropiate whatever the feedrate you want and the machine will calculate for you.
As far as calculate the coordinate of the part, the easy way is convert all the intersect endpoint to X and Y coordinate.
Sample code below:

Hope I can help.

cheers

Note: some control you have to double in X, For Y replace with C.

[disinformation]

Thanks again guys, really appreciate all the information. I have written some code using the cad pot way and also going to try the G112 see how I get on. i will elt you know the results, much appreciated!!

Francis

[ajl6549]

Originally Posted by disinformation Thanks people really appreciate the help now just got to figure it out in my head . So it is possible to run the feeds at independant rates then I gather from all this as I am sure this part cannot be made on this machine any other way. Cheers Francis

Do you have access to any CAM software? You'll need some to do it correctly. It will need at the least, small increments of X and C axis movments of varing feedrates etc.

[disinformation]

well G112 was un recognised by the system in either g112 or g12.1 forms so that does not appear to work.

I know this will sound ridiculous but we have onecnc software but when the guys came to set it up they could not get the pc to comunicate with the machine and nothing since. So I am trying to go it alone as I need to get these parts on the go.

Francis

[CNCRim]

Disinformation,

The problem seem not go away. DNC is not working it even make the job harder to program.

There are few way you can do. The fastest way right now you can do is turn the 50mm dia and use 50mm diameter endmill plunge out the contour. Second, check the parameter on your machine, once you turn it on the machine should eccept G112(G12.1). I don't know the parameter for it.