Machine make up to 1 inch in diameter and 6 inch long end mill. max travel is 12-13 inch
> Aram, > What is the total travel distance of the grinding table? > Glenn > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of > [EMAIL PROTECTED] > Sent: Thursday, May 22, 2008 6:59 PM > To: Enhanced Machine Controller (EMC) > Cc: [email protected] > Subject: [Emc-users] Harmonic gear and EMC2. ???? > > I am building CNC tool grinder. > The feed for tool grinder should be from 0.00025 to 0.001 of the inch per > minute. > The servo motor must perform at this feed perfect to make a good grinding > job. > I will use direct drive and my ball screw has 5 pitch per inch. > So talking in degrees, 5 times 360 = 1800 degrees of revolution of motor > to > get 1 inch for linear motion. > > To get 1 inch need turn 1800degrees/minute of motor. > To get 0.00025 need 0.45 degrees/minute of motor. > Is this too slow? > I think so. > The one solution is to take high end controller and large AC servo motor > and > that is expensive. > > Jon Elson said about harmonic drive. I found here www.harmonicdrive.net > That > gear can reduce up to 1 to 160. If I will put two side by side, it gives > to > me 25600 to 1 reduction. > So 0.45degrees/minute times 25600 equal 11520degrees/minute, or 32 > revolution per minute. > 32 revolution per minute is good range to any AC servomotor and with 8192 > pulse per revolution drive and EMC2 will have enough pulses to be > accurate. > > All harmonic drives have 0 backlash. One piece for NEMA34 cost $1500 and > per > axis it is $3500 with special plates etc. > > 5 axis is $17, 500 is to gears a lone to make good CNC tool grinder. > I think it is very good idea! > Instead of making electronics part and programming more complicated ( and > not all can understand that part - I can not for sure) it is much better > use > mechanical gear reducer and use less expensive and more robust drives and > software. > > I am correct? > Aram > > > > > ------------------------------------------------------------------------- > This SF.net email is sponsored by: Microsoft Defy all challenges. > Microsoft(R) Visual Studio 2008. > http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > > > ------------------------------------------------------------------------- > This SF.net email is sponsored by: Microsoft > Defy all challenges. Microsoft(R) Visual Studio 2008. > http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
