On Saturday, March 03, 2012 01:26:16 AM Cathrine Hribar did opine: > 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
Actually, I didn't get that far, although I did shorten the standoffs that will hold the motor about .600", re-dished the end I cut about a thou so they won't be doing any rocking in spite of tight bolts, but then I figured it was time I got off my butt and set the lappy up again, so I can ssh -Y into these machines & write gcode from the relative comfort of a folding chair. I had blacklisted the b43 stuffs because that chipset, a bcm4318, is the biggest POS ever foisted of on a computer maker. So I had plugged in a Netgear WNA3100 usb dongle on an extension cable about 6 feet long so one could put it up high if that's what it took to make it work. Then I reset the router I was using for an AP and reconfigured it with a decently long WPA2-PSK setup, so's I'd have enough security I could just leave it on. But ndiswrapper couldn't load the bcmwlhigh5 driver no matter what I did. Finally (I had it running on cat5 at that point) I found a squawk about a missing function in a log, so I figured what the hey, go see if there are any newer kernels than the 2.6.32.x it was running. Lo, and behold even, there was a 3.0.13 generic-pae available in the repo's, no clue why it wasn't offered when I updated it yesterday, so I drooled a bit and clicked apply. Rebooting when it was done, I was surprised that almost before kde was up and running, wicd offered to hook me up to this Buffalo/dd-wrt router here in the house, 90 feet and a layer of alu siding in the way, but it connected! Not believing my eyes I pulled the usb cable and lost the connection. So I plugged it back in & fooled with the menus till the router 9 feet away in the shop showed up and connected to that one just as easily. At that range of course the signal is 5 9's. Anyway, I am still puzzled why it never offered me the much newer kernel that Just Works(TM). But the power icon in the upper right corner of the screen is gone, no clue where that puppy went, so I had to sudo shutdown -h before I turned off the lights, that battery needs all the help it can get, its about 7 years old now. So I never did get around to seeing if I can carve that mini-hub. I tend to be a bit like the little kid on some of this stuff, like "Oh look, a pony" :) Interesting weather earlier, but we missed the killer stuff locally, thank heavens. 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> Did I say 2? I lied. ------------------------------------------------------------------------------ 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
