I need a means to create fast PCB iterations and I'm currently looking into milling machines. I've generally heard bad things about milling machines but only positive things about the "othermill" milling machine but haven't been able to find any extensive down to earth reviews of it.
Is the othermill more simple and reliable to use than the other milling machines? I have no experience with milling machines, am I making a mistake looking to buy one?
I need to create many iterations of pcbs for R&D of my various projects and waiting for pcbs to come back from the fab everytime is proving impracticle so it would be worth the price to me.
Has anyone owned or tried an othermill machine? Any advice ?
I can't speak about the Othermill because I've never used it, but I'm in the process of launching a professional PCB mill called Prometheus. Photos on my site:
www.zippyrobotics.com. What I can say is that for what Prometheus can do in terms of trace/space, it's more affordable than anything else on the market that's comparable (as far as I know). You can find cheaper machines, but I have yet to see one of them that can do 4 mil trace/5 mil space, or have a 50,000 RPM spindle. I believe it's even less expensive than the Othermill Pro. My goal is actually to deliver equal or better performance as an LPKF machine but for about 1/4 the cost. I wrote gerber import software called ProCAM which lets you bring in your gerbers and generate the tool paths. Prometheus is controlled from within ProCAM. I've tested imports from Eagle, KiCad, Altium Designer, Circuit Maker, and Diptrace so far. ProCAM also has surface tracking built-in to maintain proper depth of the bit as it cuts an uneven board surface.
Prometheus is slated for $2,299 retail/$1,799 pre-order (pre-orders only get charged when preparing for shipping, not in advance). Spindle is 50,000 RPM which allows for higher feedrates all else being equal. Spindle runout is less than 2.5 microns, which means that you can use really tiny (like 7-mil diameter) square end mills without breaking them on contact, like you would with a hobby-grade spindle. Max feedrate screams at 3,800 mm/min (150 IPM). Prometheus uses precision-ground linear guideways - not unsupported round rail. The frame is aluminum and stainless steel. The lead screws are made in the US with a lead accuracy of +/-.0003 in/in. I also have something up my sleeve for solder mask support
but we'll see if it works.
In one pic on the site you can see two 4-mil traces separated by 5 mils. That whole board was done with 5-mil isolation (just as a test).