Feed slowdown in corners with radius

[Voran]

Hello,

I have a problem with Hi feed cutter. I am milling a part with rounded corners with a feed of 9000mm/min. The problem is that i get the corners radius much bigger than should be, because the cutter is not slowing down in corners. I can do a slowdown in a sharp corner with "Feed slowdown in corners" but not where there is a rounded corner (for example R1.)

Is there any possibility that I do this in Siemens NX8.

Thank you.

 

[Voran]

I made some mistakes in upper post. First of all I need to slowdown feed in arc not in corner. And second, I cannot do it with sharp arc. I can only speed it up. Is there any possibility to slow down feed in arc?

Thank you.

 

[rg006]

Hello Voran,
I have not used NX8 yet, but I hope its the same as NX3, NX4, and NX6 (using now). You should find it under "cutting parameters" and then "corners". You will need to change the options under the "Feed Slowdown in Corners" tab. The other tab "Feed Adjust on Arcs" seems misleading to me, as I can never get it to do anything.

Anyway, you need to change the follow options:

Slowdown Distance = Current Tool
Tool Diameter Percent = 100 (or 110)
Slowdown percent = 10
Number of steps = set to how many feed changes you want, I just use 1
Minimum Corner Angle = 0
Maximum Corner Angle = 175 (or 179)

The output for my radius cut looks like this (notice it slowing down to 13, or 10% of 127, in the radius):
N120 G0 X14.153 Y-17.499 A-90.000 C0.000
N121 Z49.000
N122 Z5.218
N123 X14.153 Y-17.499
N124 G40 G1 X8.438 F 127
N125 X4.807 F 13
N126 X7.483 Y-15.254
N127 X10.671 Y-12.578 F 127
N128 Z105.218
N129 G0 Z49.000
N130 X14.153 Y-17.499
N131 Z3.245
N132 X14.153 Y-17.499
N133 G1 X8.438

Hope this helps.

UG NX3/NX4/NX6
Vericut 5/6/7
AutoCAD LT

 

[Tingsryd]

There is also Optimize Feed Rate which you may want to check out. I have pasted some of the documentation.

Optimize Feed Rate

Use the Optimize Feed Rate option to remove material more efficiently and to extend tool life. This option constantly monitors tool load and adjusts the feed rate to maintain a uniform tool load.

The software uses a 3D IPW model or blank geometry to calculate the feed rates.

You can:

Optimize the feed rate every time NX generates the operation’s tool path with the Optimize Feed Rate When Generating option.

Optimize the feed rate for a previously generated operation from the Operation Navigator.

Add the Optimize Feed column to the Operation Navigator to see which operations have optimized feed rates.




NX 7.5