On Fri, 2 Mar 2012 13:47:40 -0500 gene heskett <[email protected]> wrote: > 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. > Gene: sounds like you know more about machining than I do. Good luck with that man. Bill
------------------------------------------------------------------------------ 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
