A simple solution is to use a dual drive. Use a course mechanism with long travel for course positioning and a fine mechanism with limited travel for fine positioning. The fine mechanism has a large mechanical advantage and can use a smaller motor and driver. Of course, some sort of clutch mechanism could be used to allow switching between the course and fine speeds.
You haven't answered the question of what type of mechanism you are planning to use to provide smooth linear and rotary motions at this slow speed. Ken [EMAIL PROTECTED] wrote: > travel at feed 0.001 will be geometry of 1 inch end mill, with length of > end mill 4 inch. 0.001 /min it is cutting feed only. rapid to new position > will be much faster. > > >> It is my understanding that in a grinding machine: >> >> 1 -- Cutting forces are low. >> >> 2 -- Backlash is generally not important. >> >> 3 -- Smoothness of motion is very important. >> >> I would suggest that before you worry about how to drive the components >> in slow motion, you should tell us how you plan to drive the components >> smoothly. >> >> What are you going to use for linear (for the linear axis) bearings and >> what will you use for rotary bearings? Stiction can be a major issue. >> Air bearings come to mind as a possible solution. >> >> Regarding the feed rate of .001 inch per minute and the distance of 12 >> inches. Am I correct in assuming that you would not be traversing that >> length at that feed? If that is true, what is the actual distance that >> has to be traveled at that rate for any given "pass. A simple mechanism >> to provide very high reduction ratios is the differential screw. It >> does, however, have a limited range of motion. >> >> It sounds like an interesting project. Do you have any sketches showing >> the general layout? >> >> Ken >> >> [EMAIL PROTECTED] wrote: >>> look design of harmonic derive. it is compact and small. you do not want >>> to have huge gear reduction box on the machines. space are limited too. >>> >>>> Is there some reason why simple worm and wheel drives won't work here - >>>> even two or three stages with backlash adjusted out? >>>> >>>> Ian >>>> -------------------- >>>> Ian W. Wright >>>> Sheffield UK >>>> >>>> >>>> ------------------------------------------------------------------------- >>>> 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 >>>> Emc-users@lists.sourceforge.net >>>> 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 >>> Emc-users@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/emc-users >> -- >> Kenneth Lerman >> Mark Kenny Products Company, LLC >> 55 Main Street >> Newtown, CT 06470 >> 888-ISO-SEVO >> 203-426-7166 >> >> ------------------------------------------------------------------------- >> 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 >> Emc-users@lists.sourceforge.net >> 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 > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users -- Kenneth Lerman Mark Kenny Products Company, LLC 55 Main Street Newtown, CT 06470 888-ISO-SEVO 203-426-7166 ------------------------------------------------------------------------- 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
