Re: [ATM] Upgrading a battered 10" Newt focuser

[Martyn Cole <mgc@dsl.pipex.com>]

In message <NbbJ+tBrZE4CFwSX@xtreme.pipex.com>, Martyn Cole
<mgc@dsl.pipex.com> writes
>Hi,
>
>I recently bought a battered 10" Newt to get some experience of
>rudimentary ATM skills.
>
>It came with a horrible rack & pinion focuser and I've decided to change
>it to a nice Crayford focuser that I bought off AstroMart.
>
>I need to increase the size of hole for the drawtube from 50mm (1.97")
>to 60mm (2.36").  The wall thickness of the tube is around 1.5mm (0.06")
>and, from the battered look of the tube, easily damaged.
>
>I'd like some help in deciding what tools I should use to enlarge the
>hole, bearing in mind I'm not known for my metal working skills :)
>
>Any help gratefully received.
>
>Regards,
>

Thanks for all the tips on enlarging the hole, I'm just off to buy some
of the hand tools mentioned.

I'm sorry that I forgot to mention the tube material.  In truth I don't
know what it is but it's most likely aluminium I guess.


Regards,

-- 
Martyn.
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