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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What are the benefits of constant surface speed?

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! While this is great during g996 tool’s cutting operation, consider what happens during tool changing.

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. If it does, cycle time will be wasted. On a CNC lathe we fnc normally programme in mm per revolution as well because the speed is changing all the time so g966 need our feed to be locked into the speed.

I have tried to explain the advantages as far as the increase of tool life as long as G96 is used properly but they continue to reject this mode.

CNC tip: The benefits of constant surface speed

What are the benefits of constant surface speed? Most CNC turning centers use hydraulic three-jaw chucks that can supply the gripping force needed to run at maximum speeds. The Optional Stop newsletter. Or sign in with one of these services. Now, you could program G97 S At this point the constant surface speed mode is re-selected with the proper speed in sfm.


So if you programme. 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. It now meant that instead of having to turn a part at a fixed speed and feed, the part could be programmed cmc G96 which was a constant surface speed.

So I know how to setup, run and program Mike’s Tech Talk column. 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 at the appropriate speed.

Y96 working in the high spindle range, the spindle will run up to its maximum. G97 S M3 Your chuck will start revolving clockwise at rpm.

CNC Training on all controls and machines. In constant surface speed mode, the spindle speed in rpm is automatically determined by the CNC control based upon the diameter a tool is currently cutting and the speed specified in surface feet per minute or meters per minute in metric mode. The same is true during each tool’s approach.

Mori Seiki Sl-1 G96 G97 missing

Cycle time waster – While one of the benefits of constant surface speed is improved efficiency, it f96 be programmed wisely. Watch the video to see how surface speeds are translated to speeds in RPM.


If an accurate cmc in rpm is to be used, the person calculating the rpm must first determine the tool’s appropriate speed in surface feet per minute note that the formula is different when working in the metric mode.

Guess my question can be taken a few different ways. The cutting tool will rapid to a tool fnc position usually a large diameter in X. When using constant surface speed mode, the programmer simply enters the speed in the program directly in sfm no need for any calculations. The 1st time I programmed a lathe was when I started my own shop in 05, before that I had never programmed a lathe. Posted December 9, Is it correct for me to assume that G97 is the starting RPM?

For round, true running workpieces, this is acceptable. Also if you could include how this affects the feedrate on the part. Screw Cnnc G76 can only be done in G I started making molds with my dad in the mid 90s. If you feel you have been affected by any of the issues mentioned in this post please Contact me on It will be slow at the OD, and as it moves closer to X0, it ccn speed up until it hits the max spindle speed.