OT - but look at the specs on this one. http://www.physikinstrumente.com/en/products/prdetail.php?sortnr=700800
Also it the velocity range 0.001/min - 0.00025/min or really 0.001/m - 0.0025/min? Dave On May 23, 2008, at 5:13 AM, [EMAIL PROTECTED] wrote: > all grinders have linear incoder and all feed back comes to > computer not > from revolution of ball screw but from actual move of the table. in > that > case the accuracy of ball screw can not make table move faster or > slover. > grinder usually program with 0.001-0.003 per minute when grind > ceramics. > >> Aram, >>> From your numbers it could take over a month to traverse the >>> entire table >> and perhaps four days to grind a single end mill. Does this sound >> excessive >> to you? >> >> On anther thread, you say accuracy is not as important as speed. >> Do you >> mean smoothness of travel is more important than accuracy? Why? >> >> Glenn >> >> -----Original Message----- >> From: [EMAIL PROTECTED] >> [mailto:[EMAIL PROTECTED] On Behalf Of >> [EMAIL PROTECTED] >> Sent: Thursday, May 22, 2008 9:36 PM >> To: Enhanced Machine Controller (EMC) >> Subject: Re: [Emc-users] Harmonic gear and EMC2. ???? >> >> 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 >> >> >> --------------------------------------------------------------------- >> ---- >> 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
