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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