The same procedure as Belli Button suggest is indeed standard. Two (half height) gears mounted on top of each other and interlocking the the driving gear to remove the play on the gearing. Easy for standard gears or trapezoid and ball screw axis (two nuts on one axis) but a bit more complex for worm gears.
Most rotary tables (like the vertex one: http://hamilton-tool-supply.amazonwebstore.com/B000HRY444/M/B000HRY444.htm) have a little pin located next to the hand wheel. That pin moves the worm in an eccentric mount so you can move the worm closer to the bronze wheel - I found you can remove the play by moving this. But ... the problem is that the bronze wheel may not be fully centric mounted, resulting in a difference of the distance between bronze wheel and worm drive, resulting in too much friction or too much play. To fix this you'll have to reposition the bronze wheel. I guess the more professional and expensive ones will be using some way to center the wheel (using a conus) but on the Vertex rotary table there is a bit of play on the mount of the wheel on the rotating table. Still I managed to reduce the play on my vertex 4th axis to an acceptable level - but then I am not milling fine pitched large gears with it ... Regards, Rob Belli Button wrote: > It can be done with the Bonfig style worm gearboxes. What you need to do is > strip the gearbox, remove the bronze wheel and cut it in 'half' (slice?) > with a wire cutter. Then mill three slots concentric to the centre on one > half and drill and tap three corresponding holes on the other half. When > you reassemble the gearbox, slide the one half relative to the other to take > up the backlash. This seems to work really well but does require a bit of > engineering. We have built some fairly large '4th Axes' like this for not a > great deal of money. > > Clear as mud? > ------------------------------------------------------------------------------ Register Now for Creativity and Technology (CaT), June 3rd, NYC. CaT is a gathering of tech-side developers & brand creativity professionals. Meet the minds behind Google Creative Lab, Visual Complexity, Processing, & iPhoneDevCamp asthey present alongside digital heavyweights like Barbarian Group, R/GA, & Big Spaceship. http://www.creativitycat.com _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
