Re: EMCO 5" And Sherline Spindle/Chucks

Ballendo,

OOPS! Well, I haven't really done that much with a file on the
spindle. I did "chase" it with fine sandpaper, and wiped it clean. The
3/8" end mill adapter looks fine! It's the chuck adapter that was poor,
it's OK now, I more or less used it for practice. Would a thread dye
(sp) help? How DOES one clean up this class of close-fit threads?

Alan HELP!

ballendo@... wrote:

>
> Alan,
>
> PUT AWAY THE FILE!!!
>
> DON'T FILE THE SHERLINE SPINDLE THREADS!!!
>
> Since the NEW adaptor fits only ONE of two NEW threaded accessories,
> AND you said the threads "look bad", Just send it back and get
> another E/M holder! Sherline is an excellent MFR., but it could be
> bad.
>
> The spindle threads on a sherline have no "locating" shoulder as is
> found on larger tools. You are filing away (possibly) the
> concentricity of the endmill holder(s). And amything else which
> depends on this thread.
>
> The end mill holders are held to a tighter tolerance than the chuck
> mounts. They have to be "spot on", due to what I've written above.
> They are made in a "single chucking" to preserve the relationship of
> the E/M hole to the threads which mate to the spindle.
>
> Hope this helps.
>
> Ballendo
>
> '******************************************************************
> I did get a scare trying to thread a new 3/8 end-mill holder onto the
> Sherline's spindle. It didn't EVEN want to go on. I just thought
> my mill (Sears/Sherline) was too old. then I tried to screw it onto
> the chuck adapter that came with the new CNC rotary table. Didn't
> go on either! Third try, the adapter from the tilting angle
> table. Works fine! So what's going on? I examined the bad
> adapter using an 8x loupe, and could see that the threads (rolled?)
> didn't look too good. I chased them out with a small file, and some
> fine sandpaper, and got it to go on pretty good. I'm working on the
> spindle threads now. Much harder work, and I don't want to damage
> the threads! Any danger here? I'm not done, it goes on about half
> way, then gets tight. Hard to see the threads close enough, hard to
> work on. I will be at it some more! These must be close-fit
> threads? Am I OK in doing this? Spindle had never been used
> before, hard to understand why the threads were bad.
>
> Alan