Feed and Speed Fusion 360
When it comes to machining, the tool must work with certain parameters. Depending on the parameters chosen, we can get different surface finish. By choosing the wrong parameters, you can destroy both the tool and the workpiece. How do we know what parameters to use? At the beginning, it is best to read this information from the manufacturer’s catalog of the tool.
We choose the appropriate parameters depending on the material being machined.
Mainly we have to choose the right spindle speed and feedrate. Spindle rotation is a parameter in the part program with the letter S. It defines the number of revolutions made by the spindle in one minute (n/min).
The feed is a parameter with the letter F. It determines the path that the tool will overcome in one minute (mm/min or inch/min).
In the Fusion 360 system, we can define these parameters in several different ways, depending on the data given by the manufacturer in the catalog.
Feed and Speed Fusion 360
When it comes to spindle rotation, we set them in the Speed section.
Depending on whether we have the number of rotations (S) in the catalog, we use the Spindle speed field. If we have the given cutting speed then we use the field Surface speed. Both values depend on each other and when we complete one field, the value in the second field will be converted.
In the Ramp spindle speed field, we can specify the number of rotations during Z-axis ramping (e.g. entering material at an angle or milling holes on the helix). If we wanted to reduce the cutting speed for this type of operation, we can use this field. This can be useful for several operations with one tool. Where the tool will ramping in Z axis it will use a lower cutting speed, and in other places will use its full capabilities.
The next important parameter defining our machining is the feed value expressed in mm/min. In the tool manufacturers’ catalogs, we can often find the feed value presented as feed per tooth – fz. Fusion 360 can handle the conversion of feed values per mm/min.
The Vertical Feedrates section, specifies the feed value for the tool’s operation during vertical plunging.
Lead-in feedrate and lead-out federate are the feed values for the tool entry into material and for tool retract. Ramp feedrate is feed when working at an angle (e.g. ramping or helical milling).
At first glance, selection of parameters is quite simple. The parameters we have given in the catalog. But we must remember that tool manufacturers often give the ranges of parameters that we can use to machine the specific material. Experience and time spent on the CNC machine will be invaluable here. Observing the work of the tool with specific parameters or changing them manually during machining, we can assess visually and for hearing whether the parameters are appropriate or whether it is still worth to “turn up” or reduce them.
Set the cutting speed to 150 m/min, and feed 0.5 mm per tooth.
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