--- In GrizHFMinimill@yahoogroups.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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