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
>
> ----- Original Message -----
> From: "Richard B Gosling" <Gosling_Richard_B@perkins.com>
> To: "spitfires" <spitfires@autox.team.net>
> Sent: Monday, November 06, 2000 9:02 AM
> Subject: Clock mounting
>
> >
> > After my adventures last week, losing my toolbox on the way home from the
> TRGB
> > Autojumble (see True Gentleman!), I did actually manage to come home with
> some
> > stuff from TRGB, including an old clock (which, with an old radio, a
> battery
> > clamp, and an armrest cost me a fiver!). This is not a perfect match for
> the
> > other gauges (it is a Keinzle), but it is the right size and reasonably
> > similar, and it works (!), so I plan to fit it to Daffy - she's not a
> tidy
> > enough car for me to worry about acheiving perfection, by a long way!!
> >
> > Anyway, this means I will have to start chopping holes in my dash. I plan
> to
> > put the clock where the light switch currently sits, between the temp
> gauge
> > and the fuel gauge, so there are 3 nice gauges in a row - the light
> switch
> > moves to the far side of the steering wheel, currently empty.
> >
> > Anyway, my question - How do I cut the hole to fit the gauge? Presumably
> I
> > need a hole the diameter of the gauge body, plus a recess the diameter of
> the
> > outer rim, creating a stepped hole, so the gauge is recessed like the
> others.
> > The main hole is no problem - I plan to use an electric jigsaw - but how
> do I
> > create the slightly larger diameter recess? I suppose the perfect answer
> is
> > to use a router, but I don't own one, nor do I really want to spend the
> money
> > on one to fit a clock that cost me a fraction of a fiver. I do own a
> couple
> > of electric hand drills as well as the jigsaw, but that's about it for
> power
> > tools. Can I get an attachment for a drill that will do it for me? If I
> try
> > that have I got a hope in hell of keeping a straight-ish (or rather a
> > smooth-ish-ly curved) line, and even depth? What else could I do? Can
> > routers be rented, and if so, for what sort of money?
> >
> > Richard and Daffy (got me tunes now, just want to know the time!)
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