This web page has a chart for calculating the "critical speed" for ball screws: http://www.roton.com/application_engineering.aspx +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ We are like tenant farmers chopping down the fence around our house for fuel when we should be using Nature's inexhaustible sources of energy -- sun, wind and tide. ... I'd put my money on the sun and solar energy. What a source of power! I hope we don't have to wait until oil and coal run out before we tackle that. -Thomas Edison, inventor (1847-1931)
>________________________________ > From: Jeshua Lacock <jes...@3dtopo.com> >To: Enhanced Machine Controller (EMC) <emc-users@lists.sourceforge.net> >Sent: Friday, July 20, 2012 5:18 PM >Subject: [Emc-users] [Off] Ballscrew Support? > > >Greetings, > >I am upgrading my machine to handle a full 4x8 foot board of material (and 5 >feet of Z!). The new table is 5x9 feet. > >I just received my 3-meter 25mm supported rails and 25mm C7 ballscrews. > >I am sure with a 10-foot span that the horizontal ballscrews will sag a little >from gravity. Is this much of a concern? Does anyone know of a trick to put >some kind of support in the middle of the span? I can't think of any practical >way. > >Thanks! > > >Best, > >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 > > > ------------------------------------------------------------------------------ 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
