Cleveland Twist Drill Q Carbide Drills

Recommended Operating Parameters

Material Hardness (Br) SFM IPR
1/4" 3/8" 1/2" 3/4"
Plain Carbon Steel 150 - 225 250 .007 .009 .011 .014
230 - 325 200 .006 .008 .009 .012
330 - 425 140 .005 .006 .007 .009
Alloyed Steel 150 - 225 225 .008 .010 .012 .016
230 - 325 175 .006 .008 .009 .011
330 - 425 100 .005 .006 .006 .009
Tool Steel 150 - 250 200 .006 .008 .009 .012
255 - 375 140 .005 .006 .007 .009
Stainless Steel 100 - 240 350 .008 .010 .012 .016
Free Machining 250 - 325 200 .007 .008 .009 .011
330 - 425 150 .005 .006 .007 .009
Work Hardening and PH 150 - 325 175 .006 .008 .009 .010
330 - 375 120 .006 .007 .008 .009
380 - 425 85 .004 .005 .005 .006

 

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 richer emulsions and cutting oils are recommended.

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.