| MATERIAL |
HARDNESS |
SFPM |
FEED
(IPR) |
| MAGNETIC SOFT STEEL |
< 120 HB |
115 |
.008 - .011 |
| STRUCTURAL STEEL |
<200 HB |
100 |
.0008 - .011 |
| PLAIN CARBON STEEL |
<250 HB |
90 |
.0007 - .007 |
| ALLOY STEEL |
<250 HB |
80 |
.0007 - .007 |
| CAST IRON |
<150 HB |
110 |
.0008 - .011 |
| CAST IRON |
<150 <300HB |
85 |
.0007 - .007 |
RPM = SFPM X 3.82 /
DIAMETER OF TOOL
FEED RATE = FEED/REV X RPM
EXAMPLE:
A 1/4" DRILL IN PLAIN CARBON STEEL WOULD RUN AT APPROXIMATELY 90
SFPM
WITH A .0007 - .007" FEED/REV.
| RPM
= (90 X 3.82) / .250 |
FEED
RATE = 1375 RPM X .0035 |
| RPM
= 1375 |
FEED
RATE = 4.8125 IN. / MIN |
P.O. Box 1118
Buford, GA 30515
(P) 770-945-5590 (F) 770-945-9320
1-800-890-3590
*DID YOU KNOW THAT . . .
CUTTING TOOLS AND SERVICE HAS EXCEPTIONAL CUSTOMER SERVICE
CALL US TO HELP YOU GET THE RIGHT TOOL!
