I ran my numbers through a calculator and I needed 38 ounce inches on each axis. That was using some pretty high numbers for my table weights and speeds for my little smithy machine. I think I gave myself 150lbs on the table to account for a tool turret in the future. My motors are rated for 101oz-in. Even running down at about 80v I should still have about 1700RPM out of the motors which with my 5mm lead is good for about 344in per minute which is ridiculously fast for my 8 in travel on my cross slide and my 15 inch travel on my longitudinal axis. I will probably gear down about 5:1 which still gives me nearly 70 ipm.
--- On Sat, 4/23/11, Dave <[email protected]> wrote: > From: Dave <[email protected]> > Subject: Re: [Emc-users] Motion control cards > To: [email protected], "Enhanced Machine Controller (EMC)" > <[email protected]> > Date: Saturday, April 23, 2011, 8:16 AM > >>I am trying to do champagne > on a soda budget > > You are not alone. :-) > > >>I am looking at about $70 per axis for those amps. > > That is really cheap. > > How much power or torque do you need? > > There was a guy selling brushless drives and motors out of > Canada (Vancouver?) for a while on Ebay and his setups were > very inexpense. > > Dave > > > On 4/23/2011 10:49 AM, Robert Pabon wrote: > > Yeah, the 80v is the only real downer for me as well > but everything else looks good. The PWM command eliminates > the need for a pwn to analog conversion card so that is > good. cost wise I am waiting on a final answer but they are > cheap. My budget is minimal and I am trying to do champagne > on a soda budget. I am looking at about $70 per axis for > those amps. > > > > --- On Fri, 4/22/11, andy pugh<[email protected]> > wrote: > > > > > >> From: andy pugh<[email protected]> > >> Subject: Re: [Emc-users] Motion control cards > >> To: "Enhanced Machine Controller (EMC)"<[email protected]> > >> Date: Friday, April 22, 2011, 2:50 PM > >> On 22 April 2011 22:26, Robert Pabon > >> <[email protected]> > >> wrote: > >> > >>> Man my head is starting to spin! No wonder > people just > >>> > >> go with steppers and call it a day. Maybe my > vision is > >> clouded by ignorance but it doesn't seem like it > should be > >> that hard to pick up a brushless DC motor, a > suitable amp > >> and make it work. > >> > >> The issue is that to commmutate a brushless motor > the drive > >> needs to > >> know the rotor position. There are lots of ways > that that > >> information > >> can be transmitted, and the manufacturers seem to > like to > >> choose > >> deliberately incompatible methods (possibly so > that they > >> can guarantee > >> motor and drive compatibility). > >> > >> > >>> http://www.servodynamics.com/Drawing/23S-IE.pdf > >>> > >> Looks good. No wierdness there, just conventional > Hall > >> sensors and an > >> incremental encoder. That's about as easy as it > gets. > >> > >> > >>> http://www.a-m-c.com/download/datasheet/bd30a8.pdf > >>> > >> That one looks a little easier than the other, as > it takes > >> a PWM input > >> rather than an analogue voltage. > >> It claims to allow you to swap the hall phasing > between 60 > >> and 120 > >> degrees, so combined with the 6 possible ways to > connect > >> the halls and > >> the 6 possible ways to connect the power cables I > think > >> all > >> possibilities are covered. > >> The drawback of the AMC drive you linked is that > it only > >> goes up to 80V. > >> > >> How much are they? > >> > >> -- > >> atp > >> "Torque wrenches are for the obedience of fools > and the > >> guidance of wise men" > >> > >> > ------------------------------------------------------------------------------ > >> Fulfilling the Lean Software Promise > >> Lean software platforms are now widely adopted and > the > >> benefits have been > >> demonstrated beyond question. Learn why your peers > are > >> replacing JEE > >> containers with lightweight application servers - > and what > >> you can gain > >> from the move. http://p.sf.net/sfu/vmware-sfemails > >> _______________________________________________ > >> Emc-users mailing list > >> [email protected] > >> https://lists.sourceforge.net/lists/listinfo/emc-users > >> > >> > > > ------------------------------------------------------------------------------ > > Fulfilling the Lean Software Promise > > Lean software platforms are now widely adopted and the > benefits have been > > demonstrated beyond question. Learn why your peers are > replacing JEE > > containers with lightweight application servers - and > what you can gain > > from the move. http://p.sf.net/sfu/vmware-sfemails > > _______________________________________________ > > Emc-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > ------------------------------------------------------------------------------ Fulfilling the Lean Software Promise Lean software platforms are now widely adopted and the benefits have been demonstrated beyond question. Learn why your peers are replacing JEE containers with lightweight application servers - and what you can gain from the move. http://p.sf.net/sfu/vmware-sfemails _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
