On Jul 21, 2012, at 5:49 PM, andy pugh wrote: > On 21 July 2012 23:04, Jeshua Lacock <jes...@3dtopo.com> wrote: > >> At 5cm/rev that is 547 IPM. I think I could happily live with that. > > That's a very high-lead ballscrew. I haven't seen any balls crews with > a pitch twice the diameter. Are you sure you are not a factor of 10 > out?
That is funny - at the same time you must have been thinking of this, I was double checking it! The specs said the lead was 5. I had assumed 5cm - in fact it is only 5mm! Doh! So you are correct - off by a factor of 10! To make matters worse, I thought they were 25mm, but they are 20mm. So that drops the safe speed down to a miserable 43.89 IPM. :'( Damn. Anyone want to buy two brand new ballscrews? :D Maybe I will use them on a laser cutter instead. High speed is not as important to me on a laser cutter as it is on a 3D milling machine. Path lengths are *much* longer doing 3D stuff versus 2D cutting…. Maybe I will use timing belts for this machine. Just seems like they will have a lot of flex over a 10 foot span. Chain drive? Cheers, Jeshua Lacock Founder/Engineer 3DTOPO Incorporated <http://3DTOPO.com> Phone: 208.462.4171 ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
