Quote Originally Posted by HankMcSpank View Post
I'm unfeasibly tight (e.g. rather than move to a large house with a gravel drive, I simply glue rice krispies to my car tires) ....I would therefore never use my modest CNC machine to mill PCBs if I had to pay that for my copper board!

I use the paper based stuff (far nicer to work with...and whole lot cheaper)...

Low cost copper clad board ....100mm x 160mm is only 35p per board delivered (if buying 100pcs)

.....however, often it isn't perfectly flat, so I use double sided tape to attach the copper board onto sacrificial waste material (for this, I use nice flat acrylic sourced from a local industrial estate's skip!) to take out the worst of any bowing ...I then use CNC-USB CNC software to do the cutting. This software has a cool built in utility which probes the surface first and then takes account of probed peaks & troughs to adjust the Z height as it goes about it's isolation milling. I use 30 deg 0.2mm tip carbide V cutters from China...they're fine for my needs. (about a tenner for 10)...I can go as low as SOT23-6 (which is about 0.6mm between consecutive pads) ....I'd be able to go lower if my machine had ballscrews, but it just uses standard 1.5mm pitch threaded rod.....one day
Thanks for the replys and wow that is cheap I will be looking into that for sure and the cutters on ebay.