Simplified drill geometry: Drilling Performance

Dormer Pramet’s continuously thinned web (CTW) technology is unique to the company’s rotary drilling range. Traditionally, web thinning is performed as an additional operation after point grinding, according to the company. A drill point is thinned by shortening the length of the chisel edge to reduce the needed thrust force. CTW technology simplifies the chisel thinning process as the depth is already set, and, therefore, no adjustments are needed during regrind, regardless of drill length.

“CTW increases both flute volume and cross sectional strength,” said Ricky Payling, application specialist at Dormer Pramet. “The combination of these elements ensures consistent forces throughout the drilling cycle, with little or no increase in power requirement as the drill penetrates deeper into the hole. This, in turn, allows increased cutting speeds and greater performance reliability without compromising tool life.”

Dormer Pramet’s R459 solid-carbide drill is for producing holes up to 8 diameters deep. Image courtesy Dormer Pramet.

The point design of the R459 drill after machining stainless steel for 30 minutes. Image courtesy Dormer Pramet.