Is N/mm² the same as MPa?

Yes. One newton per square millimetre is exactly one megapascal, which is why strengths are quoted in either.

How many kgf/cm² is one bar?

About 1.02 kgf/cm². Gauges marked in kg/cm² read almost the same as bar.

How do I convert cutting speed from SFM to m/min?

Multiply surface feet per minute by 0.3048. 500 SFM is about 152 m/min.

Engineering unit converter: mm to inch, MPa to psi, kgf to N

Convert

ValueFrom

micron (µm): 25,400
mm: 25.4
cm: 2.54
metre: 0.0254
thou (mil, 0.001 inch): 1,000
foot: 0.083333

Conversions used

1 inch = 25.4 mm exactly; 1 thou = 0.0254 mm.
1 kgf = 9.80665 N; 1 MPa = 1 N/mm² = 145.04 psi = 10.197 kgf/cm².
1 kgf·m = 9.80665 N·m; °F = °C × 9 ÷ 5 + 32.

Questions

Is N/mm² the same as MPa?: Yes. One newton per square millimetre is exactly one megapascal, which is why strengths are quoted in either.
How many kgf/cm² is one bar?: About 1.02 kgf/cm². Gauges marked in kg/cm² read almost the same as bar.
How do I convert cutting speed from SFM to m/min?: Multiply surface feet per minute by 0.3048. 500 SFM is about 152 m/min.

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Results use standard formulas and typical values. Use them for estimating and planning; check critical figures against the drawing, the material certificate or the maker's data.