On Thursday 18 June 2015 19:32:34 MC Cason wrote: > Gene, > > I just did a teardown of my HF 12x36, and replaced the spindle > bearings. What I found sickening, was that there was NO oiler hole > for the rear bearing, and the front bearing's oiler hole was drilled > to the wrong side of the bearing, and was mostly covered by the > bearing cup.
Why am I not surprised. Note: statement, not question. :) In my 7x12, there is not a single provision to lube the spindle bearings. The bottom of the head casting is wide open with no intended way to lube the bearings at all. So I bought a new head, will remove the backgears completely, and make up a floor inside the casting so that I can fill it up enough with vactra that the remaining gears will throw a bit of it around, hopefully getting some into the bearings. Drive will then be direct from the motor, to about a 6" wheel taperlocked to the back of the shaft where the change gear driver gear is now. Everytime I have decided to rebuild some part of it better, I am blown away by just how crappy the 7x12 design was in 1975 when it first shipped stateside, but more amazed, that despite its shortcomings becoming world wide known, not a single thing has been done to address the real problem, a crappy design. No fine tuning, nothing. > I uploaded pictures to Flickr if anybody is interested. > https://www.flickr.com/photos/46689581@N03/18128737943/in/album-721576 >52150681293/ > > On 06/13/2015 08:38 PM, Gene Heskett wrote: > >> I would not trust the Grizzly spindle bearings @ 6000 rpm unless I > >> had removed, checked fit, regreased and set the bearing preload. > > > > And TBT, these are horrible, 15 minutes no load at 1600 revs raised > > the quill temp 25F on my IR thermometer. I am repeating the breakin > > procedure, but I doubt if it will do much good, I believe them to be > > seriously preloaded way too high. > > > > IMO, decent bearings are a must, but you do not get those in a $850 > > machine. So no complaints to Grizzly unless I can't find decent > > bearings a year down the log. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
