http://www.youtube.com/watch?v=NhkWINPRK3A&feature=related

cool!

Iv often wondered how they do that

These are ace, I've had a sample lying in my toolbox for ages. Much quicker and tidier than rivnuts. Google FLOWDRILL.

Davie

I'd guess that you'd need a fairly solid and powerful drilling machine to do that - the text says 1.5 - 3.5KW, which is 2 - 4.5 HP (I think). Also strong enough to allow a fair bit of pressure on the bit too...

Interesting process though...

how much is the starter set? would be great for chassis rails instead of rivnuts

that chuck must spin at a fair rate of knots!!!

I wonder if my clarke pillar drill can do that and up to what size? 8 mm would be plenty I guess I'd settle for 6 mm.

not possible with a DIY bench drill
http://www.centerdrill.de/html_en/faq.html

Hey all, sorry recieved an inquiry through the website, so thought I would have a look at the locost builders forum.

For doing up to 2mm with an M8 you will need 1.5 HP and about 2000 RPM, you can just about get away with 1.25HP but the tool life time will be a lower. If your bench drill can manage that it shouldnt be a problem to do it. The clamping must be with a collet, as with a normal 3 pronged chuck the drill will slip because of the high axial force and torque.

Also if you want to have a look at http://www.flowdrill-gmbh.de/english/flow2go_en.htm it is sadly not hands free but can be placed on a work bench nicely.

Hope you guys keep up the good work on the forum and if you have any questions just ask.