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 -- "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> Don't let your mind wander -- it's too little to be let out alone. 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
