Cost Cutter® Combined Drill & Tap
Combination Tap and Drills are a unique cost saving tool as two operations are combined into one. They are recommended for thru hole applications only. The Drill diameters are set at 65% thread because it is a combination tool.
North American Tool can manufacture as a special with a smaller Drill diameter (75% thread). The Drill point must break thru before the tap portion starts. It is important to verify the drill and thread length on the tool before using.
The stock Cost Cutters are designed for parts with a depth (2) Max times (x) the diameter. They can be run at a constant speed, starting at the tapping speed and working towards the drilling speed. The Feed rate for the Drill section is slower than the feed rate for the tap. The Drill cannot be run at a Feed rate as fast as the tap and the tap cannot be run at a Feed rate as slow as the Drill. The Feed needs to be adjusted after the Drill point breaks thru and before the tap starts.