Fagor 8055TG control Ft/min problems

[sparkymeller]

New to cnc programing. Need help with writing program to get my ft/min. and rpms correct. My carbide inserts are breaking down fast. Circle says to run them 200 ft/min. My program starts out as

G90 G95 G97 S950 T1 M3
G54
G92 S980
G96 S200

As the cutting cuts the large dia. the S980 reduces its rpms to slower speed. Then speeds up as the dia. gets smaller. But that changes the ft/min number also.

[JP Hardinge]

I'm totally new to G-code and I'm treaching myself as I go with my Fagor 8025, so take what ever I say with a grain BUT...

First off in your first block you are telling the machine to operate in inches per revolution with the G95, then G97 which is a constant revolution per min, and cancels your G95 since it's in the same line I believe.

Then you show no code for a feed rate.

I do everything in G95 (inches per revolution), but I tell it the feed rate "FPR" feed per revolution (in inches) example F.002 or 2 thousands of an inch per revolution.

So you set your rpm, then set and ajust the feed rate for your cut, and I use G01 (linear Interpolation) before my FPR.

For instance:

G90 G95 S950 T1 M3
G00 X.0
Z1.0
GO1 Z-2.375 F.002 (-Your now telling the machine to move (cut) .002 per revolution at 950 rpm, 2.375 distance in Z-)

Forgive me if I misunderstood your question. Like I said I am totally new to this.

[JP Hardinge]

Here's a PDF download for a real good Fagor 8025 operating manual. It will show some examples that you can use I'm sure:

http://www.cms-cnc.com/901-2025.pdf

It will explain the proper use of G96, and G97 as well as G95.