Re: Sherline Z-axis ballscrew feed.

Hello Rich,

I was hoping someone would point that out...

Isn't this a CNC forum?!?<G> And don't the people in need of this mod
have cnc mills?<G>

And can't a cnc mill make something like a LH 3/8-20 thread rather
easily... (hint, use a std. 1/4-20 tap with all but one tooth ground
away as a cheap threadmill) The experts may cringe, but it works just
fine...

If ya really wanna go for it, use a LH 1/4-20, and you can cut
several threads at once (if its a 3 flute, grind away two flutes
worth of teeth, etc.) The "usual suspects" will have that threadmill,
err, I mean, tap...<G>

Hope this helps,

Ballendo

--- In CAD_CAM_EDM_DRO@yahoogroups.com, RichD <cmsteam@s...> wrote:
> Ballendo,
> There is one big fly in the soup! The leadscrew is 3/8-20 **LH**.
> There are no taps available off the shelf that I can find.
> I've checked all the usual suspects.
> RichD
>
> ballendo wrote:
> >
> Snip>>>
> >
> > P.S. If you've got the old, non- lockable style z axis nut: The
> > sherline thread is 3/8-20, a common thread. Making a decent nut
seems
> > a whole lot less work, IMO. You may even be able to add your own
> > version of a "starwheel", like Sherline uses on the xand y...
> >
> > Here's how: Start with a brass nut threaded for the leadscrew.
Turn
> > its OD to fit, and mill or file grooves for the "star" shape. tap
a 4-
> > 40 or so hole in the flat back of the existing nut. Using a piece
of
> > springy sheet, or music wire held by a 4-40 screw in this hole,
bend
> > til it engages the grooves in your star nut, which is screwed into
> > position above the existing nut (like the new style locking
lever).
> > Viola, A/b nut.
>
> --
> ~ ~~ ~ ~ ~~ ~~____~,~~ ~~~~
> \------/ |00|_[]_[]__||0 C.M.Ry Tenwheeler
> .|_CMRy_|-|__|________|_|, <<<Under construction>>>
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> --=Rich=--=Colorado Midland Railway=-=cmsteam@s...=-
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> You need only two tools: WD-40 & Duct Tape. If it doesn't move and
> should, use WD-40. If it moves and shouldn't, use the duct tape.