On Sunday, February 13, 2022 12:25:48 PM EST Robin Szemeti via Emc-users wrote: > If you can tilt the head at an angle, then something as simple as "G1 > X300.00 B30.00" will do it, depending on how you have configured the B > axis. If you can't tilt the head, no amount of GCODE will help you. > > I'd just do it on the lathe ... > I've considered that too by making a tool holder to grab a die grinder or router. But that would need an er20 collet on my chicago grinder with isn't made, so I'd have to find a 60 degree 1/4" tool. Which seems only to be made in SC at 11x the cost of a ten pack of steel ones. This is not ammenable IMO to using a follower rest unless its movable by the gcode so the powered cutter seems to be the only way on a lathe.
The biggest problem on the 6040 is getting the B and its tailstock aligned to adequate accuracy, the extension tables are just time to make once a jig has been made to drill the mounting bolts where they go on each end. Spacing the height a few thou above the bed and the x position is I think just a matter of mirroring xy by a sign change in Openscad. I want to use my newly driven B axis which now has a 50/1 printed harmonic drive plus a 60 tooth on the axle, being turned by a 53 tooth on the drive turning it by gt2-3 timing belt drive, to turn the screw blank. >From preliminary measurements if the B drive is mounted 50 thou below the end of the bed, axis aligned by the end of the bed, ditto for its tailstock, I can handle a 20 to 21" blank. Turn 4 or so 2x2's round with an 1/8 mill, install the wedge and a 60 degree tool, and a 2 loop, 70 line gcode file should cut it. The first one likely wasted by determining the exact tpmm of the nuts I'm printing right now, a 2 start so the half nuts are identical, at about 12mm per turn. The problem is that openscad is dimensionless, and cura assumes mm, which is pretty close but probably will not properly distribute the force against the load side of the teeth, breaking the high load teeth first. It will be hundreds a times faster to modify the gcode than to make new nuts, it takes openscad about 10 minutes to render the nut to .stl, and my BIQU-HX 18 hours to print it. 2 each=about 35 hours if I'm there to start the 2nd when the first is done by repeating the already generated gcode. But I might be checking my eyelids for leaks. That H2 printhead is amazing once the flow rate is adjusted down about 6%, using a .12mm layer and a .4mm nozzle. Prusa lipstick red PETG, 250C nozzle, 80C bed. Downright "purty". And it Just Works. Take care & stay well everyone. Cheers, Gene Heskett. -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author, 1940) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
