Neil, I have drilled corian blanks left the drill turned on and drilled up to two hundred at a time using only DeWalt Extreme 2 HSS-G 7mm DIN 338 ie for slims the 7mm without losses or breakouts, no sacrificial board under and have not changed drill speed from very fast for many years now, just saying a mug like me can have success using my methods. I hate fluids near wood or Corian they dont improve the gear over time. My 2 cents. These drills in Australia are fully back on the market individually again I have read complaints as a drill point drill you cant sharpen them who cares after hundreds of drillings the cost each pen is so next to nothing anyway they are wonder drills without peer for the cheap IMHO cost and as the label says be careful they are sharp on the points lands and flutes. For anyone who has not seen or used these drills they have a mini conventional true drill point I used to buy them by the hundred for others as well as me one guy I gave one was a pro pen maker and used this drill I gave him for years unbelievable IMHO again.
They simply do not track.
Apart from this my experiences there are dozens of drilling methods conspiracy theories , manufacturers to choose from methods speeds and recommendations to fill a room on this subject. As a humble pensioner I have given up sending them all round the world simply put it to the test.
Kind regards Peter.
