Disclaimer: CNC Concepts, Inc. accepts no responsibility for the use or misuse of if you could send me a list of the benefits between using G96 instead of G Constant Surface feet spindle speeds – G96, G97, G77, G To use the following codes the OmniTurn must be equipped with a spindle control package. TwinCAT CNC Axis Commissioning G97 Deselection of constant cutting speed , selection of spindle speed (modal, default) Using the G-functions G96, G97 and G, the interpretation of the S-word (or S-strings) can be optionally changed.

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G96, G97 and How To Calculate Surface Speeds

I’ve been programming lathes for abut 10 years, so I feel stupid asking this, but here it t96 I made a video a while ago to explain CSS. I use it when I teach a class on the basic principles of machining. It’s meant to be played cnnc the background as I stop and verbally explain the concept, but there is enough wording to give someone a good idea. Check it out if you want. I know what it is, and I have always understood the concept. I just wasnt sure what G96 did.

Theres a difference, dont put words in my mouth.

Siemens SINUMERIK 808D Programming And Operating Manual: Constant Cutting Rate (g96, G97)

I started making molds with my dad in the mid 90s. I had my own shop after that for 6 years, went to work for other shops for the last 4 years and now Im back on my own again. The 1st time I programmed a lathe was when I started my own shop in 05, before that I had never programmed a lathe. So I know how to setup, run and program I find it peculiar that someone asks a question and suddenly his knowledge is questioned, as if everybody here knows everything and was born knowing.


Guess my question can be taken a few different ways. Wasn’t trying to take a shot at you. Guess we’re all different and learn things at different times. G96 constant surface speed control according to the list of G codes. That helps, but it makes me realize that I should also have asked about the G My next question is, how does it determine G97?

ANd what does G97 control?

If you program G96 S Now, you could program G97 S G97 is a constant, unchanging RPM. You can use G97 and have the RPM stay the same, no matter what the cutting diameter. No matter what, it’s Cnf you use G96, it changes. It will be slow at the OD, and as it moves closer to X0, it will speed cnf until it hits the max spindle speed. Cbc sets the max speed, and that’s important because, as the cutting tool gets closer to X0, it theoretically has to spin up to a bajillion RPMS in order to keep the constant surface speed you program.

So G50 keeps the machine from spinning too fast for safe cutting conditions. However, when you program to use G96 in Mastercam, you will see an initial G97 move at the toolchange. This is put there because if you were to start in G96 mode, while your turret is in home position, the spindle would have to start spinning at 1 RPM or g997. Having your spindle constant ramp up to max then down to 1, then up and down again isn’t really the best practice.

Basic Turning G96 G97 – CNC Programmer Training

So it kicks out a ccn RPM at the beginning. This RPM is calculated using the formula listed above, using your cutting start point as the diameter.

That’s why it’s such a random number like RPM. Once it gets into position and G96 kicks on, you shouldn’t see any spindle speed fluctuation and it will go right into the cut gg97 the appropriate speed.


G96 and G97 are mutually exclusive: Make 2 simple programs and go watch it run, soon as you see the 2nd program run you’ll have that “aha” moment I guarantee!

I know what it does, and why. I wasn’t clear on what to change, I thought that changing G97 had an effect on the way it works.

Now, thanks to all the people that answered my question, I have a much better understanding of what to change. You need to be a member in order to leave a comment. Sign up for a new account in our community. Already have an account?

Subscribe to eMastercam News. Industrial Forum Existing user? Or sign in with one of these services Sign in with Facebook. Sign in with Twitter. Use your display name or email address to sign in: Sign In Sign Up. Posted December 7, I’ve only programmed Haas lathes and I’ve always gotten the following code: I know what the G50 and and G97 are or dobut I’ve never been sure about what the G96 does.

I’ve always just gotten it to work to my liking by messing with the 3 numbers, but can anyone tell me exactly what changes when the G96 changes? Share this post Link to post Share on other sites.

Posted December 8, How does someone who’s been programming for 10 years ccn know what constant surface speed is? Cnv JParis and Cathedral, we need more people like you guys.

Posted December 9, Is it correct for me to assume that G97 is the starting RPM? Posted December 10, Create an account or sign in to comment You need to be a member in order to leave a comment Create an account Sign up for a new account in our community. Register a new ccnc. Sign in Already have an account?