But if you cut the larger hole first with the hole saw, you can keep
the pilot hole and then cut the smaller hole. Optionally, cut the
smaller hole NEARLY through, then cut larger (recess) hole, then
finish smaller hole.
Or use a fly cutter (looks like a drill with an arm clamped on and a
cutter clamped to that, like a lower-case ``H'') -- cut the larger
diameter first, then reduce cutting radius and finish by cutting
through the smaller hole. This is definitely a drill-press job unless
you have a very steady hand, though.
Donald.
> From: "Graziano, Michael" <michael.graziano@csfb.com>
> Date: Mon, 6 Nov 2000 13:35:33 -0500
>
>
> Just a thought.....
>
> Rather than a hole saw. Why not use speed bores. Use the larger bore
> first, to fit the rim. Go down just far enough. Then use the smaller bore
> for the main section. THe guide piece on the two bores should be similar,
> and should help keep the two drills aligned.
>
> As for Joe's suggestion, I had a friend a while back that needed a few shop
> tools. He went to a local trade high school, and had a couple of students
> do the work for him for $20. Memory is failing me, but I think he needed
> to turn something on a lathe for a high school science project. I can't
> remember for the life of me what the experiment was, either. sigh.......
>
> Richard, is this an option on the other side of the pond?
>
> -----Original Message-----
> From: Joe Curry [mailto:spitlist@gte.net]
> Sent: Monday, November 06, 2000 1:01 PM
> To: Luke Lewis
> Cc: Spitfire List; Richard B Gosling
> Subject: Re: Clock mounting
>
>
>
> Using the second (larger) hole saw to cut the larger hole for the recess
> sounds like a good idea, but I have found that unless you have
> a drill press to hold the saw in place and some way to clamp the piece you
> are sawing into, you will end up with a recess that is off
> center with the other hole.
>
> Therefore, if you have a drill press, clamp the piece onto the bed of the
> press and drill out the smaller hole. Then without releasing
> the piece, change to a larger saw and use a stop to set the depth of the
> recess. That should work fine.
>
> Joe
>
> Luke Lewis wrote:
> >
> > After doing this to both my old plastic dash, and the new Cherry dash that
> I
> > made this summer, I would definitely recommend using a holesaw of the
> > correct OD for the main hole, and another for the bigger OD section (That
> > takes some control but it's possible) ... Using a jigsaw makes it too easy
> > to bodge the job, and you don't get a second chance!
> >
> > Luke
> > '71 mk.IV
> > London.On.Can
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