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 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 ------------------------------------------------------------------------------ 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
