Technical Information - HP/Conversions

Conversions
Fractional Inch	Decimal	Millimeter
1/16	0.0625	1.588
1/2	0.1250	3.175
3/16	0.1875	4.763
1/4	0.2500	6.350
5/16	0.3125	7.938
3/8	0.3750	9.525
7/16	0.4375	11.113
1/2	0.5000	12.700
9/16	0.5625	14.288
5/8	0.6250	15.875
11/16	0.6875	17.463
3/4	0.7500	19.050
13/16	0.8125	20.638
7/8	0.8750	22.225
15/16	0.9375	23.813
1	1.0000	25.400
1 1/16	1.0625	26.988
1 1/8	1.1250	28.575
1 3/16	1.1875	30.163
1 1/4	1.2500	31.750

Horsepower Calculation

HP cutter = (CU. IN. / MIN) / K = (WOC x DOC x IPM) / K

Example: WOC = 3" ... DOC = 0.2" ... IPM = 42 ... "K" = 1.56
HP cutter = 16.2

WOC = width of cut

DOC = depth of cut

IPM = IN. / min. = inches per minute (feed rate)

Conversion Formulas

Inches x 25.4 = Millimeters

Millimeters x .03937 = Inches

Inch to Metric
MM	Inch	MM	Inch
1	0.0394	26	1.0236
2	0.0787	27	1.0630
3	0.1181	28	1.1024
4	0.1575	29	1.1417
5	0.1969	30	1.1811
6	0.2362	31	1.2205
7	0.2756	32	1.2598
8	0.3150	33	1.2992
9	0.3543	34	1.3386
10	0.3937	35	1.3780
11	0.4331	36	1.4173
12	0.4724	37	1.4567
13	0.5118	38	1.4961
14	0.5512	39	1.5354
15	0.5906	40	1.5748
16	0.6299	41	1.6142
17	0.6693	42	1.6535
18	0.7087	43	1.6929
19	0.7480	44	1.7323
20	0.7874	45	1.7716
21	0.8268	46	1.8110
22	0.8661	47	1.8500
23	0.9055	48	1.8989
24	0.9449	49	1.9291
25	0.9843	50	1.9685

Material Hardness and "K" Factors

Work Material	Brinell Hardness	RC Hardness	"K" Factor
	85-200	up to 13	1.64
steels, wrought and cast	201-253	13-25	1.56
	254-286	25-30	1.28
	287-327	30-35	1.1
	328-371	35-40	0.88
	372-481	40-50	0.69
	482-560	50-55	0.59
	561-615	55-58	0.54
P-H stainless steels	150-450	1-48	1.27-0.42
stainless steels,
ferritic, austenitic,	135-275	up to 29	1.54-0.76
& martensitic	286-421	30-45	0.74-0.50
cast irons	110-149		2.27
gray, ductile, and	150-175	1-7	2.00
malleable	176-200	7-13	1.89
	201-250	13-25	1.52
	251-300	25-32	1.27
	301-320	32-34.5	1.19
titanium	250-375	25-40.5	1.33-0.87
high temp. alloys	200-360	13-39	0.83-0.48
nickel, cobalt based
iron base	180-320	8-34.5	0.91-0.53
nickel alloys	80-360	up to 39	0.91-0.53
aluminum alloys	30-150		6.25-3.33
magnesium alloys	40-90		10.0-6.67
copper	150	1	3.33
copper alloys	100-150		3.33
	151-243	1-23	2.00