Has anyone found a good pcb board for milling and supplier? Also the same goes for bits and drills, and what others have used and found they would recommend, I ‘m only going to do CMOYS’s the are tiny headphone amps mainly for my own production. I’ve been loads of tutorials but none actually say what board they use , they do recommend software and some say what tools.
I 've seen this type of board from CPC wonder if anyone has used it ?
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here though i got it locally off ebay and not used it enough yet to need to consider a replacement...
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
Last edited by HankMcSpank; 17-09-2012 at 12:14 AM.
Yes that board is really cheap. Is it 1.6mm thick or more like 1.0mm?
Can you link me to where you get the 30 deg bits from please? As I'm currently paying a tenner each. I'm assuming they are not the flat blade type of thing that seem to be listed on ebay? Mine are the pointy type, i.e. proper V shaped.
Here's an example of the bits I'm sourcing from ebay (not sure if it's the exact seller, but they're all much of a muchness)...
10 Carbide PCB Engraving Bits CNC Tool 30 Degree 0.2mm | eBay
These normally come with either 0.1mm end or 0.2mm tips - obviously 0.1mm gets your tip into finer places....but for my money the 0.1mm tip shreds away too easily...if you're not after SMD type isolation milling, I'd say go with a 45 degree or even 60 degree bit.
Thanks. Those are the kind I was meaning, I was concerned they would not give as good a finish as the fluted type I currently use.
Also while searching around the forum, I think you said that those ebay spade ones lasted longer than the fluted one you tried? I've not worn mine out yet, but not done that many boards.
The other benefit of milling paper based board (aside from the more lung friendly dust) is that the board is more easy going on the cutter...afte all, it's just a skimming of copper on top of paper.
Last edited by HankMcSpank; 20-09-2012 at 12:07 AM.
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