It is handier than spindle rpm because it is independent of diameter. For a given rpm, surface speed changes at every distance from the center. At 2, rpm the surface speed may be calculated as follows:. Surface speed is traditionally expressed in either feet per minute or meters per minute, so we can divide by 12 inches to the foot and arrive at SFM.

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G96 Selection of constant cutting speed modal. G97 Deselection of constant cutting speed, selection of spindle speed modal, default. G Maximum spindle speed in the case of G96 G not modal, max. On selecting G96 the starting rpm of the spindle is given by the programmed cutting speed and the distance of the tool tip to the centre point of turning.

This distance can be obtained from the last not in the current NC-block programmed position and the reference point offset of the face-turning axis. In the current machining plane G17, G18, G19 , exactly one face-turning axis must be present. A cutting speed programmed for G96 using the S-word is valid only up to the deselection with G With G96 the activation of constant cutting speed occurs with the programming of the S-word first.

The specifying of a maximum spindle speed by G is optional and effective only during G Close to the centre point of turning, the programmed maximum spindle speed rpm G or the maximum spindle speed, specified in the assigned axis parameters [2], determines the limits of constant cutting speed.

Traversing blocks of the face-turning axis in the rapid mode G00 lead to an interruption of G96, thus undesired rpm-value changes while positioning the tool can be prevented. The next traversing block with G01, G02 or G03 cancels the suppression of G Programming example.

N30 G96 S63 Selection of const. Workpiece radius mm according to X-coordinates. N60 G97 Deselection const. N70 S max. N80 G92 X Reference point offset in X by mm.

N90 G96 X60 Cutting speed from N50 not valid: const. N G00 X Rapid mode: rpm-value remains constant. G96 Selection of constant cutting speed modal G97 Deselection of constant cutting speed, selection of spindle speed modal, default G Maximum spindle speed in the case of G96 G not modal, max.

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## G96 G-Code: Constant Surface Speed CNC Programming

The feed F is the path velocity and represents the value of the geometric sum of the velocitycomponents of all axes involved. The dimension unit for the F word is determined by G functions:. G96 constant cutting rate ON. G97 constant cutting rate OFF. G94 and G95 are used to define the feedrate unit, G94 is the default command, G95 is meaningful only when the spindle rotation. N G95 F1.

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## G96 and G97 G-Codes

Tags : G96 G It meant that instead of having to turn a part at a fixed speed and feed, the part could be programmed in G96 which was a constant surface speed. Where diameters changed, particularly when facing, it made a massive improvement to tool life and surface finish as well as speeding up the whole process. So if you program.

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## G96, G97 and How To Calculate Surface Speeds

W e have two different modes to choose from when controlling the rotational speed of our component, the G96 constant surface cutting speed and the G97 constant spindle speed. The G96 command is used when we require a constant surface speed or cutting speed. This speed indicates the distance that the tool moves along the components surface per minute. When G96 is selected, the spindle speed is automatically changed by the machine controls so that the speed of the material's surface stays constant when as the diameter changes during the machining operation. The cutting speed is determined by the material, the cutting tool, the components shape and the chucking method. As the tool approaches the centerline of the part, the spindle speed will increase until it reaches the maximum spindle speed for the machine. This is generally a bad idea as at this speed the centrifugal force may course the chick to fail at securely holding the workpiece.

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