Originally Posted by fstfrddy
I run about 800RPM and cut .025 at a time but this is with the small X2. An industrial mill can handle more I am sure but small cuts are better. Try to get "Rapid-Kut" end mills they are without a doubt the sharpest mills going and put Niagara to shame. I cant help with the :"O" rings, I have yet to tackle that myself, IMO you absolutely need CNC to do it. You will not find the taps you need at lowes or the Depot and the ones they do have are junk IMO, get them from McMaster. Also when tapping copper (screw holes) you may want to increase the drill size just a bit. Copper is sticky and the taps tend to lock up. I threw away a few blocks in the beginning due to broken taps.
Thanks for the info. I'll try the Rapid-Kut end-mills if I need to order new ones. Already have a pretty good choice of large end-mills at work and ordered my own smaller endmills from Grizzly and Mcmasters for the slitting-saws. Where do you buy the Rapid-kut end mills at? Also went ahead and ordered some M2.5 taps, think I as able to get M4 taps before at Home Depot, but pretty sure that was the smallest metric tap they had.
If you're not using o-rings to seal your blocks, what are you doing? Just RTV silicon? I simplified my block to be just a rectangle instead of a weird shape that will be hard to make an o-ring seal for. I saw mcmasters sell rounded, square and other shape o-rings and was just going to use this http://www.mcmaster.com/#o-rings/=2d3aip
Cord stock o-ring with an o-ring splice kit. Which looks to be a spool of o-ring material and a splice kit to make whatever o-ring size you need.
And damn if I didn't already place the order for the taps 5 minutes before seeing the spool of o-ring material and splice kit. Shipping from the East Coast to here is not cheap. Was thinking I needed to see what length o-ring I would need after I made the grooves and measured.
Is the problem just making a rounded corner for the o-ring groove? Coulda sworn I saw blocks with square o-ring corners, but if not I think I can make some rounded corners with the spinning table attachment thing we have.