PCB Milling bits

[reiyuki]

Quick question. I'm getting ready to make some PCB's using a CNC Taig and was wondering if anyone has experience with anything other than a half or quarter engraver bit.
I see these things at the hardware stores all the time, and was wondering if it would be good for PCB. I'm guessing it won't work due to the shape of the tip, but who knows?
http://www.dremel.com/en-us/attachme...=66240&I=66309

[samco]

I have had really good luck with http://www.thinktink.com/stack/volum...e/mechmill.htm

around .007 isolations

sam

[reiyuki]

I saw those a while back, will order some when I get a chance.


Any preference for degree? 30/45/60

My spindle can do 10,500rpm , what would be a reasonable ballpark feedrate to match?

[jcoats]

http://drillbitcity.com/ -- resharpened bits a very good prices, IMHO.

[blackbeard52]

Try your dentist.... he will have burrs and cutters made of carbide that he or she will donate for the cause. Most are used once and thrown away. if you can get a holder it is a never ending supply of mini engraving and cutting tools.

Bob

[pminmo]

http://www.millpcbs.com/index.php?page=links Drewtronics bits for the price are pretty awsome. Feed rates depend on cutter size, spindle rpms, material removal and remaining material. At 25K rpm and 9mils of material removal, clean edges with a new sharp bit can be had at 12ipm. If the remaining trace width is wide enough you can go faster, as remaining trace width gets smaller you run the risk of tearing the remaining trace. For example if your leaving a 10 mil trace, you are taking chances at faster than 8ipm for the above example.

[dang]

Originally Posted by blackbeard52 Try your dentist.... he will have burrs and cutters made of carbide that he or she will donate for the cause. Most are used once and thrown away. if you can get a holder it is a never ending supply of mini engraving and cutting tools.

That's still not a good enough reason for me to go to the Dentist.