Have a look at this thread here
http://www.cnczone.com/forums/showth...t&pagenumber=1
Using steppers and acme rod, he's tested it at well over 150ipm.
I never said anything about hardware store parts. You have to expect to spend a little bit of money (maybe more than a little) to get that kind of speed. But, you can get multiple start acme leadscrews for relatively cheap. I bought 6ft lengths of 2start, 8tpi for about $22 each. I noticed yesterday that you cna get 400+ oz-in Nema23 Vexta's for $150. You'll most likely need Geckos, as well. Of course the problem always lies with the linear bearings. From the trial assembly I did on my router (not yet finished), I think I'll get good results with my rollerblade bearing interpretation. You can see that here:
http://www.cnczone.com/forums/showth...r+first+router
I'm hoping I can see at least 100ipm rapids or more. Time will tell. Even with motors and XYlotex drivers, I'll should end up at around $1000. For another $500, I could substitute THK type bearings. Maybe the B-W dualvee system on the longer axis if affordable THK's aren't available on Ebay. I think a $1500 3ft x 4 ft machine is attainable. And $35 plans would probably sell like crazy. But, I understand your position, I was just making a suggestion.
i would not expect any stepper system to be accurate at those speeds. maybe at 600-800rpm, with propper acceleration. |
Why not? Shopbots can supposedly cut at 120ipm, rapid at twice that, with 300+ oz-in steppers. The Shopbot's limits in my opinion are the somewhat flimsy construction. Which they seem to be addressing with a new version (although it's $2000 more). Wer'e talking wood routers here, not precision metalworking mills.