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Installed in The Spring Chuck of The Spindle：
When in use, the drill bit is installed in the spring chuck of the spindle. The clamping length of the twist drill on the spring chuck is 4-5 times the diameter of the drill shank to be clamped firmly.
Check The Concentricity of The Spindle and The Collet and The Clamping Force of The Collet:
1.Poor concentricity will cause small-diameter drills to break and inaccurate hole diameters.
2.Poor clamping force will cause the actual speed to be mismatched with the set speed, and slip between the chuck and the twist drill.
Check The Spindle Presser Foot:
The contact surface of the presser foot should be horizontal and vertical to the spindle without shaking to prevent broken drills and offset holes in the drilling.
Twist drills can be clamped on Manual, Electric Drills, Drill Presses, and Lathes.
Suitable for Wood, Malleable Iron, Aluminum, Plastic etc.
Drilling holes must be kept clean, and coolant can be used for lubrication and cooling when drilling metal.
Jimp
Reviewed in the United States on July 8, 2019
works
Chase Carpenter
Reviewed in the United States on March 14, 2019
I bought these to drill and tap aluminum. I immediately noticed the bits seemed to big. I measured with my calipers, 0.4mm larger than the bit that came with the tap (which was 3.05mm). 0.4mm is a large amount of error for a bit this small, and renders them completely useless for tapping.
Aylen Reyes
Reviewed in the United States on October 14, 2019
Justo lo que necesitaba y muy buenas
Customer
Reviewed in the United States on April 1, 2019
A+++
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