On Friday, March 02, 2012 01:24:42 PM Cathrine Hribar did opine: > On Thu, 1 Mar 2012 21:23:11 -0500 > > gene heskett <[email protected]> wrote: > > Rather than inline the carriage drive screw, with will leave the motor > > hanging out quite a ways on the left end of this lathe, I could save > > about 3" if I mounted the motor to the bed on another piece of 1/4" > > alu plate, such that a gear on the motor shaft would engage a gear on > > the lead screw. > > > > I bought a set of steel change gears before I got the bug to put > > motors on this thing, so it looks as if I can drive a 65T on the lead > > screw with a 35T on the motor, an 8 wire 425 that says 5 amps on it, > > but I suspect that is a per coil, one at a time rating. I am only > > using about 2.40 amps on the Z axis for the mill and it certainly > > seems to be enough when the coils are wired in series. I can put 155 > > lbs on a bath scale with it, which is a heck of an improvement over > > that same motor driving the old, back of the post screw and tapping > > the motor out at 5 lbs showing on the same scale. > > > > Anyway, is there such a 'hub' I can buy, or am I doomed to try & make > > it? > > Hi Gene: > > For years I was unable to make things like that, if u need some one to > make it, and can't do it your self, I will help. I can do castings and > machine stuff like that and it's fun! > > show me a drawing or hand sketch. > > Bill WA0WWN
What I have in mind is locating the center of the existing keyed hole in the gear, drilling 3 holes around it for 10-24 screws at 120 degree intervals, then taking a ball nose to bore it for a tapered hole, then make the corresponding Browning Taperlock hub insert. Only about 10% of the size Browning usually makes. I am continually amazed at watching a 9" dual belt pulley, mounted to a 1.25" shaft with such a hub, sitting there running for 50 years & countless belts and 2 or 3 pulley replacements because they wear too, with edge wobbles of perhaps 2 or 3 thou if the bolts are equally torqued. Because the hub needs to be slightly crush able when its drawn in, I don't see opening up the 10mm hole far enough to remove the vestiges of the key slot, leaving the hubs tapered walls thin, just enough to establish the taper angle the full thickness of these 10mm thick gears. My major fit problem would be in making the 1/4" hole in the hub to a sufficiently accurate .2505" to get a good fit on the 425oz motors shaft. Probably by mic'ing my ball noses and using one of them for a drill bit as I know my drill doctor isn't able to grind a drill's nose accurately enough to prevent runout and an oversized hole. Going in with smaller mills means a tapered hole, not a workable situation IMO. I'd drill a smaller pilot hole for the ball nose of course. That is likely my first experiment this afternoon, to see if I can actually drill a hole to that accuracy level. If I can, then I think I am off to the races. If that fails, I might take you up on that offer Bill, thank you. > > Thanks guys. > > > > Cheers, Gene > > ------------------------------------------------------------------------ > ------ Virtualization & Cloud Management Using Capacity Planning > Cloud computing makes use of virtualization - but cloud computing > also focuses on allowing computing to be delivered as a service. > http://www.accelacomm.com/jaw/sfnl/114/51521223/ > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> Less is more or less more -- Y_Plentyn on #LinuxGER ------------------------------------------------------------------------------ Virtualization & Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
