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Hole Drilling Tips

The Drill Doctor

   NorthernTool.com
Clogged chips are the most common cause of drill bit brakeage
When the hole depth is greater then three times the diameter you can consider this a deep hole.
"Peck" drilling is used when drilling deep holes to prevent bit breakage.
Your feed rate is a major factor in breaking up chips, a chip breaker ground in the bit can help control your chip
Coolant will help wash away the chip, cool the bit and work piece
Lube can help with chip removal and reduce heat
 
Peck Drilling:
Drilling only a few thousandth and pulling your drill up out of the hole to remove chips from the flute of the drill

Chatter Issues:

Work must be rigid, use the shortest bit possible, machine tool should be large enough for the task,  use a drill bit with a thicker web, use thicker coolant

 

  

 

 
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Hole Drilling Charts

After you watch this video on Machinist Drills you can find some good information on them from this page

Drill Point Recommendation Chart

Styles Point Angle

Recommended Uses

118*

All purpose drill for soft metal, wood and plastic

135* Split Point

Designed to be used without a center drill

130*

Disperses heat well, Good for deep hole drilling

140*

Used mostly on carbide drills Good for tough metals

 

Drill bits are made of several types of materials.

Below is a chart to help you chouse the right bit for the job.

 

Cutting Tool Material Selection Guide
Types Recommendations
HSS (High Speed Steal) Good tool life, minimal cost, works well in carbon steel, soft nonferrous materials
Cobalt (M-35 M-42) Run 10% faster then HSS. good for cast iron, tool steel and titanium alloys
Solid Carbide High Performance runs faster and longer, will cut hard materials very brittle, requires ridged setup
Powdered Metal Lower cost alternative to carbide, less brittle, less prone to breakage then carbide


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