[modeleng] Re: Adept/Super Adept lathes
- From: Allen Messer <al_messer@xxxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Tue, 3 Jan 2006 10:06:49 -0800 (PST)
Many thanks for your clearly described method. I will
keep this on file for the future.
Al Messer
--- peter.chadwick@xxxxxxxxxxx wrote:
> Al said:
> >Peter, you mention "trepanning a hole." Would you
> enlarge upon that proceedure for the sake of those
> of
> us who are scared to death to try it?<
>
> I use what is basically known in the UK as a 'tank
> cutter'. Mine is
> actually a
> 'circle cutter' from Sears - I think it was in
> Phoenix that I got it, and
> from memory,
> it was about $5 or 6..
>
> So you set the cutter bar the right distance out
> from the centre drill.
> Clamp (and
> I mean clamp - if it moves, you have BIG problems!)
> the work, and I use
> the cutter
> in the vertical mill, running slowly - about 70rpm.
> Gently feed in the
> cutter using
> the fine feed, applying lubrication - cutting oil
> or whatever. Be
> careful, because
> especially with soft material such as aluminium (or
> I suspect, even worse,
> copper)
> it can jam up and stall the mill. Or conceivably
> worse.
>
> I use the cutter in a drill chuck, as I do end mills
> and slot drills. This
> is not supposedly
> good practice, and before attempting to do it, it's
> important to modify
> your chuck in the
> method described in 'The Amateur's Workshop'. This
> works with Jacobs'
> chucks, and
> involves drilling a hole up through the chuck from
> the jaw end and into
> the chuck arbor.
> The Arbour is then tapped 6BA (or 4-40) and the
> chuck itself tapped 4BA
> (6-32). You can
> then put a 6BA screw and washer in to hold the chuck
> to the arbor, while
> if you ever want
> to separate them, the large screw put in jacks the
> chuck off the arbor.
> Note that not all
> chucks can be modified this way, but the standard
> Jacobs' chucks are fine.
> (Albrecht
> chucks can't be dealt with this way, but I've never
> seen anyone offering
> to supply those.)
> Touch wood, after 6 years, I haven't had anyproblems
> using the chuck for
> end mills, slot drills, the
> 'circle cutter' or a hole saw, all of which can
> either have a tendency to
> try pulling the chuck
> off the JT6 taper arbor, or produce enough vibration
> to break it loose.
>
> Hope this answers the question
>
> Peter Chadwick
> Swindon.
>
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