Hi Norman
I'm not sure but a few thoughts-
What kind of finish does the shaft have? I think the bearings should wear to fit the shaft and if the shaft is nearly perfect round and smooth then the bearings high spots will wear until the whole bearing is supporting the load then stop wearing. If your shaft is out of round or rough surface or not straight, then I think the wear will keep on. Did you look at the bearings to see how much of the bearing surface was contacting the shaft ands verify they are both well aligned with the shaft?
Maybe you can blacken the bearing surface and then check the fit? Use plastigage or something to be sure you have enough clearance for oil? Maybe your clamps are too tight and squeezing out oil?
Another question- what is your bearing material? Are you using a real bearing material and is it large enought suface area? ifyou like me and try to use sutff on hand, maybe your material is a little too soft? I would expect just about any kind of bronze or brass would maybe work but maybe you need some real bearing material?
Keep us posted. I need to get back on my shaper project- sidetracked with other things but maybe by Christmas will have a working shaper?..then hope to make a miller!
Regards
Bradley
--- On Mon, 9/27/10, Norman Leonard <normanleonard52@yahoo.com> wrote:
From: Norman Leonard <normanleonard52@yahoo.com>
Subject: Re: [gingery_machines] Miller Spindle Bearings from gingery_machines_4
To: gingery_machines@yahoogroups.com
Date: Monday, September 27, 2010, 10:39 AM
I've ran the mill at all speeds breaking the bearing in with lots of oil. The fastest speed makes the motor labor so I don't use it. I wasn't seeing any wear until I tried milling a slot in one of the cast face plates I made for the mill. I made a 1/4" single tooth bit from a broken drill. Looks like a small fly cutter. running the mill at the next to fastest speed I made 2 slots in the plate during the last cut is when I noticed the wear. Until the milling of the slots all I'd done is boring and some face plate machining. I guess the side load on the bearings from milling caused the wear. I've re shimmed the bearing but still have about 0.002 of side to side play if I get it to no side to side play then the bearing are so tight I can't spin the spindle.So I guess I'll keep playing with it and re shimming I hope the bearing will soon seat and the wear will stop. I may even get a new set of bearing just in case these poo the bed.
Norman
--- On Mon, 9/27/10, Brite <coldtoo2000@yahoo.com> wrote:
From: Brite <coldtoo2000@yahoo.com>
Subject: [gingery_machines] Miller Spindle Bearings from gingery_machines_4
To: gingery_machines@yahoogroups.com
Date: Monday, September 27, 2010, 2:01 AM
--- In gingery_machines_4@yahoogroups.com, "normanleonard52" <normanleonard52@...> wrote:
>
> Any of you guys having trouble with the spindle bearings wearing quickly? Mine are wearing quickly in their first use of about 2hrs
> running time they went from nice and tight with no slop to over 0.012 play. Will they stop wearing soon or do they keep needing adjusting?
> I keep them well oiled, all of the other bearings are still good and tight.
> I'm thinking about trying timken bearing for the spindle head
> or if any of you guys have an answer to a better bearing let me know.
> The problem with going to a roller type bearing is there isn't a lot of room to fit unless you make the spindle head size larger for such a change which I didn't do. I've also built the metal shaper before I started the mill project.
>
And my reply:
Hi Norman,
I don't have a good answer for you, but I do know bronze bearings wear quickly at first. How fast are you running the spindle?
I"ll repost your message at the main group here:
http://groups.yahoo.com/group/gingery_machines/
as it is where all the members go.
CT2
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