Jk files & tools markets joran high speed, tungsten carbide tipped [tct] twist drills from denmark. These hm-hss drills are precision ground drills specially designed for drilling hard, brittle and short chipped materials like cast iron, silumine, hardened steel, etc. Joran twist drills are primarily applied in pillar machines, automatic drills, cnc machines and working stations. These are most suitable for the machine industry due to its efficiency and high cutting speed. These drills have high speed steel body, hardened and tempered to assure rigidity and appropriate wear resistance and tips of hard tungsten carbide that ensure correctly sized hole and optimum drilling economy. The production equipment should be sturdy and vibration free to justify the use of high speed twist drills. Selecting the right combination of speed and feed, it is possible to improve the efficiency of the tool, so as to take advantage of the possibilities of the high speed twist drills. These come in two ranges:
- i] cylindrical shank drill - din 338 specification from æ2.0 x 24/57 to æ18.7 to 135/198 and din 8037 specifications from æ2.0 x 18/45 to æ20 x 90/160; and
Ii] taper shank drills - din 8041 specification from æ10 x 50/140 - mt 1 to æ30 x 125/275 - mt 3 and din 345 specifications from æ10 x 87/168 - mt 1 to æ40 x 200/349 - mt 3.
