On Sunday 10 February 2013 18:42:48 John Thornton did opine: > McMaster Carr does not have a minimum order... I've ordered $2 parts > from them, you still pay reasonable shipping on anything you order. > > John
Thats better, thanks John. Now to remember it. In any event, Andy gave me a clue that turned out to be the fix. Turn the bearings around, and then shim between the outer races does the whole thing, so I am down to a decent backlash setting now. I also filled them with grease before re-assembly. Wouldn't want to burn them up as I can now go 60 ipm for rapids now. Thanks John. > On 2/10/2013 8:05 AM, Gene Heskett wrote: > > On Sunday 10 February 2013 08:34:10 Mark Wendt did opine: > > Message additions Copyright Sunday 10 February 2013 by Gene Heskett > > > >> On Sat, Feb 9, 2013 at 7:15 PM, Steve Blackmore <st...@pilotltd.net> > > > > wrote: > >>>> That may work for most 'Murkan made machines, but those with the > >>>> made overseas in Asia tend to have a pretty lousy fit for the > >>>> standard grease gun fitting. > >>> > >>> Hi Mark - oil nipple heads often aren't the same size and shape as > >>> grease nipples. Myford's were fitted with oil nipples, not grease > >>> nipples. I still have the original Wanner oil gun off one. It > >>> doesn't clip on the nipple. The end is simply a recess that you > >>> push against the nipple and pump. > >>> > >>> There's a link on this page that shows oil nipples (and the > >>> expensive pump ;) > >>> > >>> http://www.lathespares.co.uk/oil-lubrication-c-31/wanner-oil-gun-for > >>> -t he-myford-lathe-new-p-646 > >>> > >>> The round head type nipple generally has a smaller diameter head > >>> than a grease nipple with the same thread. > >>> > >>> Plenty of Myford spindles were damaged though by people forcing > >>> grease into them using those grease guns with an adjustable > >>> clamping nozzle. It often forced the wick (hidden in the hole) into > >>> the bearing.. > >>> > >>> Steve Blackmore > >> > >> Steve, > >> > >> Yah, I'd heard about some of the horror stories where folks had > >> forced grease into an oil fitting. That was why I was concerned for > >> Gene when he mentioned his grease gun wouldn't fit the zerk. A > >> number of guys on Practical Machinist had bought machines where the > >> previous owner had forced grease into an oil fitting, and left a > >> mess. > >> > >> Gene, check the link for the image of the two type oil fittings at > >> the bottom of Steve's link. Does your zerk look like either of > >> those? > >> > >> Mark > > > > The photo isn't as clear as it could be. However folks, we aren't > > talking about a high speed spindle. This is a ball nut on a 16x5mm > > screw, that I was able to get 60 ipm rapids out of last night with a > > 2/1 geardown so the motor is charging right along, thinking I was > > home free, but the backlash setting I needed was excessive IMO, > > someplace in the .0045" to .0048" range, which seemed awful sloppy > > for a ball screw that was supposedly a C7 grade. Turns out there is > > zero preload on the angular ball bearings in the drive end bearing > > block regardless of the torque applied to the tensioning nut. > > > > So, I need a 12mm bore, 18mm OD, .2mm thick shim washer to space the > > center races apart far enough that when I put the end cap back on the > > block, pushing in on the outer races, they will then be preloaded > > about a thou. Or is that too much crush? .1mm is the thinest I can > > get, but that will only take up about 60% of the end play which as > > is, looks to be as above, measured on either end of the screw. > > > > Besides, the grease fitting has been replaced with a Murican version > > (finding that turned into an all afternoon job Thursday) and the nut > > has been greased enough to push a small amount past the felt (or > > whatever, its white, wipers at each end of the nut. Since its maxed > > at maybe 300 rpm, std lithium grease will make it outlive me. > > > > It turns out, in my tour of the place looking for suitable shim > > material, that the alu slider on a 3.5" floppy disk is about that > > thickness. But cutting a shim out of that would probably be an EDM > > job to do it neat enough without burrs on the edges. Unless somebody > > else has an idea. > > > > McMaster-Carr has them in either 316 or 18-8 SS, straddling a $10 bill > > but whats their minimum order? More than a tenner IIRC. > > > > Cheers, Gene 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> is up! My views <http://www.armchairpatriot.com/What%20Has%20America%20Become.shtml> How many surrealists does it take to screw in a lightbulb? One to hold the giraffe and one to fill the bathtub with brightly colored power tools. I was taught to respect my elders, but its getting harder and harder to find any... ------------------------------------------------------------------------------ Free Next-Gen Firewall Hardware Offer Buy your Sophos next-gen firewall before the end March 2013 and get the hardware for free! Learn more. http://p.sf.net/sfu/sophos-d2d-feb _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
