Catia V5 Lathe problem

Kimmo Takala

Catia V5 Lathe problem

I got a simple test model which I use Profile Finish Turning operation. When tool is at that point in the picture I got a problem. If I use diamond insert with nose radius 0mm then I get right numbers without decimals in G-code (N50 G1 X400. Z1200. F.3) but if I use nose radius 2,4mm then the G-code is (N60 X504.72 Z600.575 F.4). I need nose radius 2,4mm and G-code must be without decimals (N50 G1 X400. Z1200. F.3) at that point.

Is it possible with using some Catia parameters or will those programmers still use another software for turning operations? Problem is always the same when tool's nose radius is different than zero.

Attachments

  • model.png (76.7k)
  • tool_testi.CATProcess (182.5k)
  • Part1.CATPart (101.5k)
  • problem.png (196k)

Jay Crook, Student

RE: Catia V5 Lathe problem
(in response to Kimmo Takala)

Hi Kimmo,
Maybe you already solved this since it's 6/15/18.
First, the numbers seem correct since Catia might be setup to output values at the center of the tool nose radius.
Second, I think you want X250 Z600 output at the problem point?
I would look at 2 things.

1. Check that the turning parameters are set to output at the theoretical point of the tool nose radius.
Your numbers will NOT be X250 Z600, because the TNR is tangent to 2 angles at the point X250 Z600.
2. If you absolutely need X250 Z600 to be output in the program, then you may need to activate the use, and output, of the G42 command, which is TN compensation right. You will program the part with zero TNR, BUT, and I say BUT, y0u will need to load the tool nose radius into the tool compensation register at the machine.

Hope this was useful.

Jay Crook.

Tim Hayden

RE: Catia V5 Lathe problem
(in response to Kimmo Takala)

The numbers are correct. The path is to the intersection point of a vertical line tangent to the radius and a horizontal line tangent to the radius. The radius of the tool doesn't violate the part geometry. This is how lathe tool paths are generated when driving the edges of the insert instead of the center of the radius. Both methods give you a good part as long as the tool is set at the machine to match the programming method.

Tim Hayden

RE: Catia V5 Lathe problem
(in response to Kimmo Takala)

Looking at the numbers I noticed you do have the edge number set to the center of the rad. If the tool is set at the machine to the center of the radius and you turn cutter comp on they can make fine adjustments if needed in the wear at the machine.