2013/8/7 Dave <[email protected]> > > ...
I have an old Bridgeport mill with steppers and I think it was geared > such that one step of the motors was equal to .001 of an inch which > apparently was good enough for thousands of machines shops. > > On the other hand the mill I have is no speed demon during rapids with > the old heavy finned motors..50-60 ipm is quite reliable. which at this > point is fast enough. > > Dave > > I've had a nice conversation with an old guy who has long experience in building machines, he thought I was aiming too high. On the other hand he thought that about my previous machine as well but I want speed and he wants control (aka less speed). Sort of. Of course I realize I'll never reach the 2500m/s^2 acceleration I have with the servo's, but it's not that large area anyway and now there's more weight to it. Lets face it, a Tormach has pretty small steppers and they do cut steel. Anyhow, I've searched the Internet after different stepper formulas and ended with the rough estimation at the Gecko site for choosing steppers. I made a sheet out of it and played around for fun. If these figures are somewhat correct, I can go with much smaller steppers than I thought. It's here for anyone who wants to try it: http://bit.ly/16DrFdP The default values are there only to check that the calculations are correct compared to Mariss' formula found here: http://bit.ly/15SU15g If I've done the sheet correct? Heck I do' no'. But if I have a go with 3m/min, 5 mm pitch, 0.25 reduction and 2.5 Nm i end up with pretty small figures and a decent tolerance. /S ------------------------------------------------------------------------------ Get 100% visibility into Java/.NET code with AppDynamics Lite! It's a free troubleshooting tool designed for production. Get down to code-level detail for bottlenecks, with <2% overhead. Download for free and get started troubleshooting in minutes. http://pubads.g.doubleclick.net/gampad/clk?id=48897031&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
