Harmonic drive but they are expensive. > I've been thinking about 4th axes; > While motorised reduction drives are readily available, the issue is > obviously backlash. > > One way to make a zero backlash drive is to use two identical > gearbox/drives. Place them at opposite ends of the axis, and pit them > against each other by a few encoder counts. > So they will track and retain the zero-backlash. > > Of course, the total power available is now less than one drive motor, but > it is an option to use almost any pair of reduction drives that can be got. > But there is also the cost of the second servo amp. > > > On Fri, 15 May 2020 at 14:11, andy pugh <bodge...@gmail.com> wrote: > > > The normally appear on eBay at up to 6x this price. > > https://www.ebay.co.uk/itm/233587431605 > > > > The B versions have conventional incremental encoders and hall > > sensors, so are easy to integrate. Lots of torque, zero backlash and a > > very strong and fancy big crossed-roller bearing make them an > > almost-complete 4th or 5th axis just needing a bracket and a drive. > > > > I have no connection with the vendor, if you order one and receive > > dolls-house furniture instead don't blame me. > > > > -- > > atp > > "A motorcycle is a bicycle with a pandemonium attachment and is > > designed for the especial use of mechanical geniuses, daredevils and > > lunatics." > > — George Fitch, Atlanta Constitution Newspaper, 1912 > > > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users
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