Thanks to everybody who replied so far for the rays of light! Maybe I should admit that I have difficulty to imagine the algorithm to translate from 3 linear axis of a delta printer to the 'euclidean' 3d space that the model will be printed in, therefore I also don't really begin to guess what kind of resolution is required on the linear axis. I imagine that gear backlash can be measured and if its not captured by an encoder on the geared down axis, it should at least in software be considered for every change of direction. Is there such an option? I may on my first printer also succumb the temptation to go with steppers maybe overdoing torque such as with a fat NEMA34 instead of 17 or 23...
My first 3D Delta shall have a max. build height of whatever results from 1 meter or 1.5m shafts, subtracting linear bearing height and linear shaft mounts, and the min. length required to be able to cause a flat surface on the build area. I gather that pole length and build diameter are somehow related probably in a formula that considers the max. deflection angle and the loss of precision that might result? One reply mentions the Ramps1.4 system; I wonder is the translation done between linear delta motion control and Euclidean G-code, or is non Euclidean G-Code used? Thanks again for all the participation, and happy weekend! cheers Tobias! On Sat, Feb 21, 2015 at 2:44 PM, Viesturs Lācis <viesturs.la...@gmail.com> wrote: > 2015-02-21 15:16 GMT+02:00 Tobias Gogolin <usert...@gmail.com>: > > I am suggesting small geared brushless motors > > Gearing will introduce backlash. Linear delta machine may have > end-effector vs actuator travel ratio up to 2:1, depending on rod > length vs delta radius proportion, so any backlash in actuator means > even larger backlash on end-effector. Take all 3 actuators, add > together their backlash and you might have difficulties to achieve > desired positioning accuracy for hotend. > I would be tempted to go the traditional way of mounting belt pulley > right on motor shaft - tuning feedback loop might be challenging, but > once that is done, the machine can be very very fast... > > Viesturs > > > ------------------------------------------------------------------------------ > Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server > from Actuate! Instantly Supercharge Your Business Reports and Dashboards > with Interactivity, Sharing, Native Excel Exports, App Integration & more > Get technology previously reserved for billion-dollar corporations, FREE > > http://pubads.g.doubleclick.net/gampad/clk?id=190641631&iu=/4140/ostg.clktrk > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Tobias Gogolin Tel. D1 (49) 0151 5187 5210 Tel. D2 (49) 0152 0839 5060 skype: moontogo messenger: usert...@hotmail.com You develop Sustainable Ranch Technology at http://tech.groups.yahoo.com/group/SURA-TECH an Open Source Electric Motor/Alternator at http://groups.yahoo.com/group/Performance_Axial_Flux and an Open Source Motor Controller at http://groups.yahoo.com/group/GoBox ------------------------------------------------------------------------------ Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration & more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=190641631&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
