Cleveland Twist Drill Q PM Recommended Operating Parameters

Speed & Feed Recommendations

Cleveland Twist Drill Q PM Drills— Recommended Operating Parameters

Material	Hardness (Br)	SFM	IPR
Material	Hardness (Br)	SFM	1/4"	3/8"	1/2"	3/4"
Plain Carbon Steel	150 - 225	120	.010	.014	.018	.024
	230 - 325	95	.008	.011	.014	.020
	330 - 425	70	.006	.008	.010	.014
Alloyed Steel	150 - 225	110	.012	.016	.020	.028
	230 - 325	85	.008	.011	.014	.018
	330 - 425	50	.006	.007	.008	.014
Tool Steel	150 - 250	100	.008	.011	.014	.020
Tool Steel	255 - 375	70	.006	.008	.010	.014
Stainless Steel (Free Machining)	100 - 240	170	.012	.016	.020	.028
	250 - 325	100	.010	.012	.014	.018
	330 - 425	75	.006	.008	.010	.014
Work Hardening and PH	150 - 325	85	.008	.011	.014	.016
	330 - 375	60	.008	.010	.012	.014
	380 - 425	40	.004	.005	.006	.008

Optimum Drill Performance Can Be Achieved By:

Very rigid machine set up such as NC/CNC machining centers or similar types of equipment (not recommended for manual drill presses).

Use of high quality, water soluble synthetic coolant.

Coolant pressure of 70-100 psi. Higher pressure extends tool life.

Choosing the proper coolant delivery techniques and/or systems.

Properly reground and recoated tools. Properly reground tools without recoating will necessitate a reduction in surface speed.