The above notwithstanding, my offer still stands. I have a few uncommitted sets left, and can bang out a dozen more in a few minutes. Have several inches of the material left, and am happy to do it.
Email off line for my address to send SASE.
David Clark in Southern Maryland, USA
--- In GrizHFMinimill@yahoogroups.com, SirJohnOfYork <steelchipper@...> wrote:
>
> On 9/6/2011 1:14 PM, Bill Williams wrote:
> >
> > Gerry, David, to answer the original question; the gears in a printer
> > are probably Delrin or something similar in properties. Since a gear
> > needs certain material behavior characteristics that are very like those
> > of a thrust washer you should be able to use them. That is a good
> > idea BTW! Bill in Boulder
> >
> > __._,_._
> I used some 5/8" black round Delrin, also known as Acetal, as per
> explained here <http://www.onlinemetals.com/plasticguide.cfm> and sold
> here
> <http://www.onlinemetals.com/merchant.cfm?pid=6566&step=4&showunits=inches&id=216&top_cat=0>.
> .
>
> Here is an easily made black round acetal thrust washer on my
> mini-mill, positioned perhaps 1/4" in front of the shoulder of the
> leadscrew that it normally slides up against in this picture.:
> http://jzcomputer.com/Stuff/Mini-Mill/AcetalThrustWasher.jpg
>
> Without the thrust washer in place, the shoulder seen just behind the
> black washer above wears directly on the face of this piece, labled as a
> "Retainer, Y-Axis Screw <http://lmscnc.com/1476>" on LMS:
> Retainer, Y-Axis Screw <http://lmscnc.com/1476>
>
> I shamelessly "stole" this idea from David Clark and posted about it
> over on the Mini-Mills <http://groups.yahoo.com/group/Mini-Mills/>
> group, complete with links to his original posts back on this group,
> where he was offering free thrust washers at that time to anyone who
> wanted them while supplies lasted. Free. Did I mention free? Free is
> good. :-)
>
> In my case I'd impatiently forced the machine to go a bit farther on
> the Y axis than it should have gone in order to complete something I was
> working on. The y-axis leadscrew shown above plowed into the "Y-Axis
> Retainer" with some excessive force, which then made for some rough
> turning afterwards. Smoothing them out (that shoulder on the leadscrew
> shaft and the retainer) with some wet/dry sandpaper, and then adding the
> thrust washer made things operate much better and smoother than it did
> before the problem ever occurred!
>
> I highly recommend that all manual X2 owners utilize David Clark's
> thrust washer idea as per shown above. Cuts down on slack and makes the
> y-axis turn /much/ smoother than before. Simple and quick to do. Mount
> and center a short length of delrin/acetal round bar in the mini-lathe
> (or vertically mount a short length of same in the mill vise and
> carefully locate the center), center drill a center hole sized to just
> fit over the shaft, and then part or otherwise cut off a ~ washer's
> thickness ~ from the end. Clean it up and mount it as shown way up
> above. Reassemble mill hand wheel and such. Done. Smooth hand wheeling
> ahead! :-)
>
> Cheers,
> John Z.
>
------------------------------------
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