Hello,

Best way to determine the correct settings is by testing, that is how I did it. But for the ones who wants to calculate things... here is a piece of text.

Regards, Wendy

Speed – Surface Feet Per Minute (SFM) is the actual speed at which the cutting edge of the tool is striking the material. It is used to determine spindle revolutions per minute (RPM). There are two formulas that relate these two values and take into consideration the tool bit diameter.
SFM = .262 x Diameter (inches) x RPM RPM = 3.82 x SFM / Diameter (inches) For most operations the RPM commonly runs between 10,000 to 20,000. Depending on bit diameter, the speed can be as low as 300 SFM and may run as high as 2400 SFM although it more commonly runs from 500 to 1500 SFM. This will change based on the demand for material removal and edge finish requirement. This is the first of three factors that will affect material finish.
Chip load - Inches Per Tooth (IPT) corresponds to the amount of material removed by each tooth of the cutter every time it contacts and passes the material. Sufficient chip load will create stability between the cutter and the work piece. The optimum chip load for acrylic
sheet is .004" to .015"/tooth.

Feed Rate – Inches per Minute (IPM) is the distance that the cutting tool travels along the edge or surface of the material being processed in one minute. The proper range for feed rate can be determined by considering the chip load. Operating in the lower part of the recommended range for chip load will tend to provide a better finish but at the expense of throughput. Operating at the
high end of the recommended range for chip load will result in a rough finish on the part but higher part throughputs. Typical feed rate parameters for ACRYLITE FF sheet range from 100 to 300 IPM. To establish the feed rate knowing the desired chip load, the number of cutting edges on the bit and the RPM use the following formula:
IPM = IPT x No. Teeth x RPM