What is this drill bit for?

[Durango]

I have this sharp-angled drill with tri-cutter head, 17mm with 19mm parallel shank.

Tip point angle is approx. 80 deg.

Made by International Twist Drill Company, Sheffield.

 

[dutchgray]

It's a 3 flute twist drill that's been ground to that angle for a specific purpose, it probably works quite well on soft materials but it may also have been done as a countersink.

 

[rlitman]

If I had to venture a guess, I'd say it is for plunge milling in aluminum.

 

[Durango]

Thank-you.

 

[larry_g]

3 Flute Carbide Drills | An exceptional surface finish

3 Flute Carbide Drills | An exceptional surface finish​

The GS200 three-flute carbide drill provides a reamer class finish in a high penetration rate design. Three flutes give added support in the cut for an accurate hole location and exceptional surface finish. A 150º point angle helps eliminate exit burrs in many applications and the three flute construction is an advantage when breaking thru on angled exit surfaces.The GS200 G three-flute carbide drill is specifically designed for aluminum and cast iron and can be used in most steel applications. The wide open flute design and thin land width allows for maximum chip evacuation while reducing side wall rubbing. The 130º helical style point provides excellent self centering characteristics and maximum machining efficiency.

 

[Mike65]

Looks to me like a countersink bit.

 

[TruckRed]

They used to drill plastics, the steep entry angle allows smooth penetration without grabbing and reduces breakout on exit.

 

[Durango]

Thanks all, must be a pricey drill today.