Page 1454 - Master Catalog 2017, Inch

Solid Carbide Drills
General Application Instructions

Coolant
• To optimize their performance, drills must be adequately cooled. With the Coolant requirement for carbide drills
proper coolant fl ow, better tool life and higher maximum effective cutting
speeds can be achieved.
• If not properly cooled, the drill will heat up rapidly. This causes the drill
diameter to expand, which in turn may cause the drill to seize inside
the hole.
• Solid carbide drills with internal coolant channels require deeper drilling
depths to be effective. The higher the coolant pressure, the better the
drilling results. Drill life and hole quality improve with ample coolant fl ow.
• When using drills without internal coolant fl ow, try to get at least one
coolant jet as parallel to the drill as possible.
• For short-hole applications, drills without internal coolant may often provide
better tool life. The tool is more solid, and it does not suffer from thermal
shock at the cutting edge.
• It is important to use high coolant concentration to provide lubricity, which
will aid in tool life, chip evacuation, and fi ner surface fi nishes.
• High-pressure coolant, either through the tool or through a line adjacent
and parallel to the tool, should always be considered for increased tool life
and production.
• Do not use multi-coolant lines. Use one line with 100% of the fl ow capacity
to evacuate the chips from the hole.

Recommended pressure Recommended pressure
internal coolant only
length-to-diameter ratio high-pressure fl ood coolant coolant pressure (PSI) coolant pressure too low

favorable pressure values

fl ood

drill diameter
drill diameter

Recommended coolant fl ow volume V [l/min] Recommended coolant pressure p [bar]

straight fl ute
spiral fl ute

straight fl ute
spiral fl ute

drill diameter drill diameter

Workpiece Rigidity
Because solid carbide drills have much higher penetration rates, it is important that the workpiece has adequate support.

correct incorrect

R136 widia.com

S lidC bid D ill R136 R137 Mi h REBRANDO
V
i
WID M
ki
16 H l
L WID_Master16_Holemaking_SolidCarbideDrills_R136_R137_Minch_REBRAND.indd 136 b 13 20154 26PM 10/29/15 1:08 PM