David Jenkins
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| posted on 9/3/09 at 12:43 PM |
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Tricky hole enlargement in dashboard.
My dashboard has a hole where a push-button used to be; it's about 20mm in diameter.
I now want to fit a different button, but it will need to have a recess of around 25mm diameter, 5mm deep, around the original hole.
Can anyone suggest a way of cutting this recess?
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matt_claydon
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| posted on 9/3/09 at 12:44 PM |
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What is the dash made of and how thick is it?
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David Jenkins
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| posted on 9/3/09 at 12:52 PM |
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Oops! 
Marine ply, around 12mm thick.
[Edited on 9/3/09 by David Jenkins]
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IDONTBELEIVEIT
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| posted on 9/3/09 at 12:53 PM |
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maybe a router with 25dia plunge bit
Are We There Yet, Are We There Yet!!!!
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Paul TigerB6
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| posted on 9/3/09 at 12:55 PM |
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25mm flat wood drill bit?? Might need to glue a piece of wood to the rear of the dash temporarily to allow the wood drill to centre on that.
link
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jlparsons
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| posted on 9/3/09 at 12:59 PM |
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Draw it up and dremel it if I were you. Score the line through the first ply with a stanley knife so it doesn't splinter, then use a fine
router-type bit.
Caveat - only if you have a steady hand mind! If not, go with the above.
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Moorron
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| posted on 9/3/09 at 01:12 PM |
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cone cutter drill bit?
file?
Sorry about my spelling, im an engineer and only work in numbers.
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adithorp
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| posted on 9/3/09 at 01:12 PM |
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I'd glue a bit of wood accross the back of the hole. Drill a centre in that and then use a 25mm hole-saw and prise the piece off after. Dremel
would be second choice because it needs a steady hand.
adrian
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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matt_claydon
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| posted on 9/3/09 at 01:37 PM |
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I think the quickest and easiset way is to glue a piece of wood on the back to hold the tip and use a (nice sharp!) flat wood bit or holesaw.
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David Jenkins
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| posted on 9/3/09 at 01:58 PM |
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I'm thinking of changing my mind... I might drill right through (rather than creating a step) and then mount a plate behind the hole. The
button's shroud can then fit through the dash, rather than sit on the surface.
I'll probably use an amalgam of the ideas you've all posted - I'll turn a wooden plug to fit in the existing hole, then use that to
locate a flat bit.
Thanks to all,
David
(now go and answer my question in Electrical re. starter solenoid current! )
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neilj37
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| posted on 9/3/09 at 02:26 PM |
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I would have just clamped a second piece of wood to the back and used that to centre a hole saw.
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cjtheman
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| posted on 9/3/09 at 05:02 PM |
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second the cone cutter (step drill )
will work every time
cheers
colin
wanted
sunny weather
sva pass 12/6/09
taxed 16/6/09
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Mix
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| posted on 9/3/09 at 05:03 PM |
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Hi
If you want to maintain the step then use a bearing guided router bit, the finish will be as good as your original hole.
Regards Mick
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