7/21/2019 Toroid Calc

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Symbol Value Unit

Maximum cutting diameter D   2.000 in.

Insert diameter Di   0.500 in.

Number of inserts in the cutter Z   4

Symbol Value Unit

Maximum spindle speed of the milling machine nmax   4000 rpm

Recommended cutting speed (surface feet) Vc   600 sfm

Axial depth of cut (d.o.c.) d   0.050 in.

Radial width of cut / stepover (w.o.c.) w   1.000 in.

Feed per tooth (desired chip thickness) f  z   0.0080 in.

Required spindle speed (at outside dia. of tool) n 1146 rpm

Effective cutting diameter (at depth of cut) De 1.800 in.

Adjust RPM for effctive cutt. diameter? (Yes=1, No=2) 1 or 2   2

Spindle speed adjusted to effective cutting diameter  na 1146 rpm

Spindle speed (adjusted for machine maximum) nr   1146 rpm

Adjusted cutting speed (surface footage) Vcr   600 sfm

Average chip thickness hm 0.0025 in.

Compensation factor for average chip thickness C 3.1623Feed per tooth, adjusted for depth of cut f zc 0.0133 in.

Feed rate adjusted to true chip thickness Fc   61 ipm

Feed rate adjusted to width of cut (if w.o.c. < 1/2 tool dia.) Fw   61 ipm

Adjusted feed per revolution Fw   0.053 ipm

Metal removal rate with adjustment to chip thickness Qc 3.06 in3/min

Metal removal rate with adjustment to w.o.c. (w < D/2)* Qw 3.06 in3/min

TOROID SHELL or END MILLS - Input data in the shaded cells only

Machining Conditions

Milling Cutter NomenclatureROUND INSERTS

Developed by Edmund Isakov, Ph.D. Page 1 of 2. 8/20/2014

7/21/2019 Toroid Calc

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Value Unit Value Unit

2.000 in.   2.000 in.

0.500 in.   0.625 in.

4 4

Value Unit Value Unit

4000 rpm   4000 rpm

600 sfm   600 sfm

0.030 in.   0.100 in.

1.000 in.   1.000 in.

0.0100 in.   0.0070 in.

1146 rpm 1146 rpm

1.738 in. 1.833 in.

2 2

1146 rpm 1146 rpm

1146 rpm   1146 rpm

600 sfm   600 sfm

0.0024 in. 0.0028 in.

4.0825 2.50000.0400 in. 0.0100 in.

183 ipm   46 ipm

183 ipm   46 ipm

0.160 ipm   0.040 ipm

5.50 in3/min 4.58 in

3/min

5.50 in3/min 4.58 in

3/min

OCTAGON

To have calculator adjust

RPM for effective cutting

dia., input "1". To use

RPM based on outside tool

dia., input "2".

Directions: Fill in theblocks shaded in light-blue

with the appropriate

information. The calculator

will automatically provide

the necessary speed and

feed in the red numbers.

For assistance, call Dapra

@ (800) 243-3344.

HIGH FEED

Developed by Edmund Isakov, Ph.D. Page 1 of 2. 8/20/2014