SG16 (4) POLY | POLIANGOLAR VIERKANT BROOTS 9,6 MM - L1=29 MM - POLY-COATED (v. RVS)

Square Tool SG16 Square mm.9,6 POLY Coated (DWG 4022.486.3630)

Please find below some of our instructions about square holes:

It is strongly recommended to make a pre-hole diameter larger than the minor diameter of the square being broached. 

See below the formulas for recommended pre-broach drill hole diameters for square forms:

Furthermore please consider the below suggestions for pre-drill hole depth:

The depth of the pre-drill hole must be greater than the broaching depth to allow for swarf to accumulate and avoid excess build up. It is recommended to have a pre-drill depth of 1.3-1.7 times the depth of the broached area.
If the square section must have four complete surfaces, the quality of material to be removed can be reduced by first making small holes in correspondence of the four edges and then the central pre-hole.

When possible, round off the edges in order to remove the sharp edge, which is the most fragile point of the tool and also the section that tends to break or chip first. In this way, most of the material is removed and the slot can be made, also quicker, and with a better finish.

Kindly note the following parameters of cutting:

It is good practice to set the rotation speed between 50 and 100 RPM in the initial phase of contact between the working piece and the tool (the feed can be the same as the machining).
Maintain these rotational speeds until the broach perimeter has fully entered the workpiece.
Then you can set the machine tool to the recommended RPM which is 1000 rpm with 0.05 mm / feed rate.