The insertion of teflon/delrin or similar plastic thrust washers in the Y has been shown to be a considerable improvement without making a modified mount to take aball thrust bearing
Gerry
Leeds UK
________________________________
> To: GrizHFMinimill@yahoogroups.com
> From: superdave257@yahoo.com
> Date: Thu, 8 Sep 2011 03:22:34 +0000
> Subject: [GrizHFMinimill] Re: Y Axis Thrust Washers and Locknut
>
>
>
> I believe for that for about Seven Dollars you can get good top quality
> thrust bearings that are a drop in replacement for the cheap Chinese
> bearings that are in the X an Y axis of the mini mill. I bought mine at
> KAMAN used to be Allied Bearings in OKC but they can be had a lot
> cheaper from that online place (don't remember the name) maybe someone
> else can fill in that blank.
>
> --- In
> GrizHFMinimill@yahoogroups.com<mailto:GrizHFMinimill%40yahoogroups.com>,
> SirJohnOfYork <steelchipper@...> wrote:
> >
> > On 9/6/2011 6:33 PM, Andrew wrote:
> > >
> > > John Z,
> > >
> > > Thanks for the well written article. Now I have ANOTHER mod to do.
> > >
> > > My Y table squeaks like crazy when turning the handle. This should solve
> > > the problem.
> > >
> > Just a couple of thoughts:
> >
> > David Clark of Maryland is still offering *FREE thrust washers*, so be
> > sure see his post in this thread about getting his snail mail address to
> > send a SASE to...!
> >
> > The Y-axis leadscrew has left hand threads. The black thrust washer as
> > shown in my last post, only really comes into play when cranking the
> > Y-axis hand wheel /clockwise/ in order to move the table towards the
> > back of the machine. (Equal and opposite reactions, the leadscrew pushes
> > the table back and so itself is pushed forward in return. That is when
> > the leadscrew shoulder wears on the retainer if there is no lubricated
> > thrust washer in there.)
> >
> > I did not elect to use the second washer for when cranking the hand
> > wheel counter-clockwise, which is when the table moves forward towards
> > the operator and the leadscrew is thus drawn /in/. IIRC, David put a
> > second thrust washer in between the graduated dial and the "Y-axis
> > Leadscrew Retainer".
> >
> > At least on my particular machine, there is a slightly raised metal lip
> > at the center of the leadscrew retainer and graduated dial that acts
> > like a thrust washer already. Again, at least on mine with it's goofy 62
> > and one half markings for the 16 TPI leadscrew, this already provides
> > for nice smooth going when cranking counterclockwise (moving the table
> > forward towards the operator). Adding a thrust washer between the
> > graduated dial:
> >
> > Dial, 62.5 Divisions <http://lmscnc.com/1483>
> >
> > and the leadscrew retainer that the dial goes up against:
> > Retainer, Y-Axis Screw <http://lmscnc.com/1476>
> >
> > just opened up a gap in between them which I did not care for, since I
> > tend to get all messy with my little machines, and didn't want any nasty
> > swarf making its way down in between them. So I ultimately removed that
> > 2nd washer after testing both with and without it, and only ended up
> > using the inner thrust washer (for when cranking clockwise, as shown in
> > the last post). Works for me without the 2nd washer just fine. YMMV.
> > Widely, even. So try both ways and see what suits you best.. :-)
> >
> > Cheers,
> > John Z. of York, Pennsylvania
> >
>
>
>
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