[modeleng] Re: Boring Bearings
- From: Allen Messer <al_messer@xxxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Fri, 9 Sep 2005 07:43:24 -0700 (PDT)
Hubert, electronics are a "black hole" to me as well.
If I were you, I would continue completing the set of
change wheels---no telling when they may come in very
handy.
Al
--- shep <shep.28@xxxxxxxxxxxx> wrote:
> Hi Al!
> Thanks for your reply.
>
> I wish that I had the Atlas attachment! In the
> meantime, I have decided to test the following
> method of boring the headstock:
> I will machine the material for the headstock into
> an accurate cube. I will then mark out the cube
> with the centre points, using a height gauge and
> surface table. I have produced an accurate vice,
> where the two jaw clamp directly onto the bed of my
> milling machine, thus providing data points in two
> dimensions. I then propose to drill the headstock
> from each side, using the marked centre points as
> references, and bore out to the size of the outer
> bearing with a boring head. The same head will
> machine the shoulder to restrain the sideways
> position of the bearing. The headstock will fit
> onto the vee ways of the bed, and this should give
> me the opportunity of 'skewing' the headstock
> slightly, until it turns a perfect parallel. Not
> the most elegant solution, but it may work in
> practice!
>
> That is the theory, which I will check out on some
> scrap metal.
>
> This is an interesting project for an old 'codger'
> aged 77, as it is 'stretching' me and forcing me to
> learn new skills. It is fortunate that there is
> no time factor involved, so it may go on for months,
> ?years!
>
> I have cut about a third of the changewheels, but
> have abandoned gear cutting, as my son-in-law, who
> is an electronic engineer, has suggested electronic
> control of the leadscrew! I have no ideas on this
> subject, as electronics are a black art to me!
>
> Cheers! Hubert
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