Sharp SH-920 Instruction Manual page 44

4.6 Down Feed and Feed Chart:
Workpiece
Material
Grinding
Rough
Fine
Note:
(A) Before adjusting frequency of spindle motor inverter (option), please
calculate peripheral speed in accordant with a following formula.
V= πDN, D= wheel diameter (ψm), π=3.14, N= R.P.M. (spindle motor), V=
peripherial speed (m/min), N= (120xf)/np, f= frequency (Hz), np= polar
number (spindle motor).
(B) The calculated speed can not exceed maximum safe operating speed
indicated on the wheel.
Cast Iron,
Soft Steel & Heat Resistant
Hardened Steel
0.0006~0.0012"
0.015-0.03mm
0.002~0.0004"
0.005-0.01mm
P.44 OF 70
Down Feed
Stainless &
Tool Steel
Steel
0.0008~0.0012" 0.0008~0.0016"
0.02- 0.03mm 0.02-0.04mm
0.0008~0.0004" 0.0002~0.0006"
0.002-0.01mm 0.005-0.015mm
Cross Feed
Feed amount is
smaller than the 1/2
of wheel width
Feed amount is
smaller than the 1/4
of wheel width