Greetings all; I come in search of help to make the pulleys to motorize this BS-1.
Here is my mental vision. 1; 3 NM motor on the rear with about a 15 tooth 2mm pitch by 10mm pulley on it. Shaft stickout is to dial side of the BS-1. Put about a 15 tooth pulley on motor. Make that on new printer. Make mounts for both ends of motor on new printer so motor won't get broken off/removed by hitting something while its being hoisted. 2; BS-1 has center dimple at center of side at center of tilt of head rotation. 3; drill and tap that now that I've straightened my mill quite a bit, to about 3/8"x20 tpi. 4; make a shaft in the Sheldon with a bracing flange about an inch in diameter and about 1/8" thick, one end threaded to screw into #3, the other end about 3/8" in dia, and say 1 1/2" long, probably with a tru-arc groove in the end. 5; using new printer, make a 2 step pulley with recesses for a pair of ball bearings to turn on #4. Tooth count of larger step of this pulley so it clears the mills table,(and possibly the worm shaft) but will need an offset outward to clear flange of worm shaft, about 5/16" IIRC. Motor mount offset to align belt. 6; make pulley for worm shaft, sized to clear the smaller pulley of idler pulley set. Size smaller step of idler pulley to clear worm shaft pulley but still give some gear reduction. Might need an idler bearing for a belt tensioner, maybe even on both belts. Obviously I need to make final measurements but this is the general idea. With a ferrous bump to be sensed by a ATS-667 hall device for a home switch I can also determine the scale value and from that the gcode for precise angles can be determined. I considered putting the motor on the tilt, but that puts the motor on top when the axis is horizontal, and this is above the top of this mills envelope. And it wouldn't give me enough gear down either. 2 belts is the only way I can see that removes belt center distance variations with tilt changes. Better ideas, anyone? Printer should arrive by the end of next week, I can't wait to play with new toy. ;) Thanks all. 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) 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
