The Mill is damn near done! Or is that "done for"...?

by Doc Nickel

As I posted about a week ago, I've been puttering with the new-to-me Exacto mill again lately, in part because I want to get the damn thing done and be able to use it, but mainly because I need to get all the loose head parts off my bloody welding table so I can actually do some work on it! happy.gif

In that last post, I figured the head was about 70% done, and in this intervening week, I was able to complete the last 30%. And today I was able to temporarily wire it up to a VFD, and put power to it!

[linked image]

And it works!

... Except we now have a brand-new problem. A Houston-we-have-a-problem, problem.

[linked image]

The spindle, as it turns out, is bent, and badly. There's a full 15 thou of wobble on the OD of the spindle nose.

Doesn't sound like much, to you non-machinists? If you'll recall that issue I was having with the Jet mill-drill last year, that surface finish issue was likely caused by less than one thou of movement. 15 thou of spindle wobble on a machine tool is like using a dull axe to trim your toenails. happy.gif

It is, however, probably not fatal. I'll have to yank the quill and pull the spindle, and using a surface plate, find out how and where it's bent. Then, hopefully, with some care and a gnarly hydraulic press, gently straighten it out.

Once it's reasonably straight- or straighter- I'll pick up some fresh bearings (any crash bad enough to bend the spindle almost certainly killed the bearings) and then once it's reassembled, regrind the spindle collet taper just like I did on the Jet spindle.

Wish me luck. If the spindle or quill winds up bad or unusable on this machine, that basically junks the whole thing, unless I'd be willing to spend between $1K and $2k on a used Bridgeport or other mill head, and figure out a way to adapt it.


Posted on Jun 10, 2017, 2:20 AM

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  1. Spare Parts. Lord *redacted* the Censored, Jun 10, 2017
    1. Please do.. Doc Nickel, Jun 11, 2017
      1. I'm on it.. Lord *redacted* the Censored, Jun 11, 2017
        1. Additions to the list.... Doc Nickel, Jun 12, 2017
        2. Scrap bin.... Doc Nickel, Jun 12, 2017
  2. Not a machinist, but. Retromash, Jun 10, 2017
  3. Re: The Mill is damn near done! Or is that "done for"...?. Irregular Logic, Jun 11, 2017
    1. Crash & burn.... Doc Nickel, Jun 12, 2017


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