Tungsten Carbide Step Drill bitsⅡ

In last part we know that a tungsten carbide step drill bit (unibit) is a conical bit for hole enlarging with straight or angled transitions from smaller to larger diameters. Smaller ones are self-starting, while larger ones need a predrilled hole. This part we talk about the advantage of and suitable work piece materials for a step drill bit.

The advantage to the tungsten carbide step drill bit is that both diameters have the same flute characteristics, which keeps the bit from clogging when drilling in softer materials, such as aluminum; in contrast, a drill bit with a slip-on collar does not have the same benefit.

One tungsten carbide step drill bit can drill the entire range of holes necessary on a countertop, speeding up installation of fixtures. They are most commonly used on softer materials, such as plywood, particle board, drywall, acrylic, laminate and in general construction. They can be used on very thin sheet metal, such as metal sheet up to 1/4 of an inch thick, but metals tend to cause premature bit wear and dulling.

(To be continued. This article is divided into 5 parts. Here is part 2. For part 1, please refer to http://news.chinatungsten.com/en/tungsten-information/80507-ti-10400; for part 3, please refer to http://news.chinatungsten.com/en/tungsten-information/80509-ti-10402)

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