Coated Carbide Drills for Steel & Cast Iron MDH Series ¢ Recommended Cutting Conditions
Mild/Low Carbon Steel A36 / 1015 ~160HB
Carbon Steel 1045 / 1050 ~230HB
Alloy Steel 8620 / 4138 20 to 38 HRC
Gray Cast Iron ~ 280HB
Ductile Cast Iron ~ 270HB
Work Material
Cutting Speed 200 to 550 SFM 200 to 525 SFM
200 to 450 SFM
200 to 475 SFM 200 to 400 SFM
Dia. (Inch / mm )
Feed Rate (IPR)
Feed Rate (IPR)
Feed Rate (IPR)
Feed Rate (IPR)
Feed Rate (IPR)
ø.1181 / ø 3.0 ø.1575 / ø4.0 ø.1968 / ø5.0 ø.2362 / ø6.0 ø.2755 / ø 7.0 ø.3149 / ø 8.0 ø.3543 / ø 9.0 ø.3937 / ø 10.0 ø.4331 / ø 11.0 ø.4724 / ø 12.0 ø.5118 / ø 13.0 ø.5512 / ø 14.0
.0047 to .0118 .0047 to .0118 .0047 to .0118 .0059 to .0138 .0059 to .0138
.0059 to .0138 .0059 to .0138 .0059 to .0138 .0059 to .0157 .0059 to .0138
.0059 to .0138 .0059 to .0138 .0059 to .0138 .0059 to .0177 .0059 to .0138
.0071 to .0157 .0071 to .0157 .0071 to .0157 .0071 to .0197 .0071 to .0157
.0071 to .0177 .0071 to .0177 .0071 to .0177 .0071 to .0216 .0071 to .0177
.0079 to .0197 .0079 to .0197 .0079 to .0177 .0079 to .0236 .0079 to .0197
.0079 to .0197 .0079 to .0197 .0079 to .0177 .0079 to .0236 .0079 to .0197
.0079 to .0197 .0079 to .0197 .0079 to .0177 .0087 to .0255 .0087 to .0216
.0079 to .0216 .0079 to .0216 .0079 to .0197 .0087 to .0255 .0087 to .0216
.0079 to .0216 .0079 to .0216 .0079 to .0197 .0098 to .0275 .0098 to .0236
.0087 to .0236 .0087 to .0236 .0087 to .0216 .0098 to .0275 .0098 to .0236
.0087 to .0236 .0087 to .0236 .0087 to .0216 .0098 to .0295 .0098 to .0255
1. The recommended cutting conditions above are for cases where internal supply of a water-soluble coolant is used. 2. Can also be used for MQL drilling. 3. If using non-water-soluble coolant, reduce the cutting speed and feed rate by 20-30% and ensure that sufficient coolant is supplied. 4. When mounting the drill in the collet, make sure that runout around the cutting edge is no greater than .0008”. 5. Make sure the flute does not enter the collet. 6. If the surface of the workpiece is abnormally shaped (tilted, interrupted etc.), reduce the feed rate to about half when feeding the drill in the workpiece.
*If stable drilling is still not possible, pre-drilling of a flat surface with a MDF Series Flat Bottom Drill is recommended. 7. When performing interrupted through drilling, reduce the feed rate to about half the feed rate used prior to this process. 8. If abnormalities such as noise or vibration occur, change the cutting conditions accordingly.
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