BB Flat Drill 180° CNC Inclined Curved Surface Bottom Hole Making Counterboring Tool Tungsten Carbide Steel External cooling

BB Flat Drill（1pcs）

Flat Bottom of the Hole, Burrless

Wave-Crescent Flat Bottom Drill
Conventional Drill Bit
Exit Side Burrs

180-Degree Flat-Head Edge

The angle of the tip is 180 °, which is mainly used for processing inclined surface and curved surface surface holes. It can also reduce the burr of the through hole

-Comparison with milling cutter and drill bit

2 Flutes milling cutter, mainly used for horizontal milling. The drilling depth is not deep.
General drill bit is more suitable for plane drilling.

Cutting Force Waveform Diagram

Application:

Inclined surface, Through hole in curved surface，Counterboring, Guide hole, Cross hole.

If there is a deviation hole in the drilling hole, the flat drill can play a role in correcting the verticality.
A craft of drill bit + flat drill + reamer
If the size requirement is not high, the reaming process can be omitted.
Some counterbore holes are made of flat-head drilling with higher efficiency and more convenient use, so there is no need to use milling cutter to insert milling to increase the machining time.
For blind hole threading, flat-head drill is more widely used.

Recommended material hardness is less than HRc45

Minimal Hole Deviation and Small Enlargement

Hole Enlargement Comparison Chart
BB TOOLS：Small Enlargement

Cutting condition

The recommended hole depth is 2xdc. When the inclined surface, it is the depth starting from the top of the material.
The cutting condition is recommended as flat surface drilling.
When drilling the hole of the inclined surface, Please adjust the feed speed according to the inclination angle.
The inclination angle＜ 30 °, please set the feed speed below 70%. ＞ 30 °, please set the feed speed below 50%.
This product is a drilling tool. Cross feed and spiral machining are not allowed.

Applicable Machines

Machining Center/Engraving Machine