On 3/23/17 4:13 PM, andy pugh wrote: > On 23 March 2017 at 20:33, hubert <h...@hbahr.org> wrote: >> I found this >> http://harmonicdrive.de/mage/media/catalog/category/1018853_FHA_C_en.pdf >> reference on harmonic drives >> and noticed the 25 or 32 etc in the model number seemed to reflect >> approximately the internal bore of the hollow shaft. I have some desire >> to be able to move things from my lathe to the Mill and since the lathe >> spindle bore is 40MM it sounds like a choice of 40 would be practical. >> From the dimensions in the above catalog seem to still fit within a >> 250MM swing or in my case 10"(254mm). >> >> Is this above catalog representative of the offerings on ebay? > Slightly more dimensions here: > http://www.harmonicdrive.net/products/rotary-actuators/hollow-shaft-actuators/fha-c > > Bores are slightly larger than size-code. > > The larger sizes might make it easier to mount a D1 spindle nose, but > the problem that 6 into 8 doesn't go remains. > FHA17 has 6 holes, but is probably too small. > I am contemplating purchase of this one http://www.ebay.co.uk/itm/Harmonic-drive-systems-Used-FHA-17C-100-E250-AC-Servo-Actuator-/111964389396?hash=item1a11990014:g:jCQAAOSwjMJXCcGL If I read it right it has 100 to one step down ratio and 2500 pulses per revolution, I don't know what the E signifies. I am assuming that the 2500 pulses is for 1 revolution of the Servo motor, not the output drive.
I think once satisfied with the 4th Axis I may want to play with an FHA17 as a 5th axis. ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
