if u have the courage to dig through this thread phaestus, u should have the answers to all your q'z + a complete worklog with all the trial and errors of me an puzzdre on our first rotor block. with some good advice of the maester himself.
http://forums.procooling.com/vbb/sho...&threadid=4766
and for a rotor design thread, after some brainstorming i designed something with alot of help. what was suggested in the end was not practically doable but i came close to what i think is a block that will be hard to improve when using the drill method. if u feel the urge to design, plz do also make a contribution in this thread. since the whole rotor style is open source, it would be nice to have a thread that encompasses all the good designs for that particular method.
http://forums.procooling.com/vbb/sho...&threadid=5114
@ BillA , we prolly have the same mark of chinese rubish drill press. the price diff between a good one will be felt in the spindle vibration. the preciseness of the depth stops (non existant on mine, if u want to be precise, measure every hole with a caliper). so a cheap press is ideal if u make 5 blox or less per year. if u do more u will want one where u can use bigger feed rates (more HP) , more precise depth stops (less time per hole because u don't need caliper). don't forget that the drilling process itself doesn't consume that much time. lapping, making the mask, punching the pilot holes, threading, those are all things that also take alot of time and precision. so go with a cheap drill, invest the saved money in the best quality tappers u can find.