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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The machine will constantly and automatically perform this calculation, updating the spindle speed in rpm. If you feel you have been affected by any of the issues mentioned in this post please Contact me on The Optional Stop newsletter. Then I tried to enter programs manually via MDI on the control and found the whenever I try to type G96 or G97 and hit write, it reverts to the last entry. Out of round workpieces – If you machine a lot of castings or forgings or any other kind of workpiece that doesn’t run true in the spindleyou must be very careful with the constant surface speed mode.

This mode is only used for single point turning tools boring bars, turning tools, grooving tools, etc.

CNC tip: The benefits of constant surface speed

If you want to know more or withdraw your consent to all or some of the cookies, please refer to the cookie policy. ANd what does G97 control? All parameters look ok and I have re entered them all. This speed is published by cutting tool manufacturers and is based upon the material being machined and the material of the cutting tool’s cutting edge. I have g966 trying to get the guys on the floor to use G96 for these parts but they have always programmed with G Could be a problem.


But you must remember to use it and know the maximum rpm a workpiece can be rotated without vibration.

Sign in with Twitter. If you program G96 S Depending upon 9g7 spindle drive system’s response time, it will likely take longer for the spindle to slow down than for the rapid motion to occur.

Website Developed By Jabberdog. But if you’re workholding device cannot grip with adequate force, of course, you cannot run at optimum speeds.

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If an accurate speed 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.

Mike’s Tech Talk column. It can cause the workpiece to be thrown from the workholding device. Sign In Sign Up. The cutting tool will rapid to a tool change position usually a large diameter in X. My next question is, how does it determine G97?

I know what it does, and why. When using constant surface speed mode, the programmer simply enters the speed in the program directly in sfm no need for any calculations. So G50 keeps the machine from spinning too fast for safe cutting conditions. I know what the G50 and and G97 are or dobut I’ve never been sure about what the G96 does.

So it kicks out a steady RPM at the beginning. Note that there is a special function that lets you set a temporary maximum rpm G50 with Fanuc. That helps, but it makes me realize that I should also have asked about the G Register a new account.


A CNC machine in G96 will give a lovely finish because the surface speed always remains the same. I thought it was the BTR but it tested ok. You can use G97 and have the RPM stay the same, no matter what the cutting diameter.

What I really mean is that the most important thing is to understand what the machine can do and the concepts of programming and Basic Turning.

They kept him happy all night. G96 S M3 Your machine would start up at a surface speed of metres a minute. Subscribe to eMastercam News. On the outside your speed is too fast and when you get to the centre you are too slow.

One common reason why setup people and operators ncc the shop floor continue to use rpm mode -even though it is fnc to use sfm mode – is that they have a background in manual machining. Posted December 9, To program around this problem, most programmers will temporarily switch to the rpm mode just before the rapid motion to the tool change position, using a speed in rpm that is appropriate for the next tool’s first position.

CNC Training on all controls and machines. Anyone have any other ideas?

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