andyborris
Posted a lot
Freedom is just another word for nothing left to lose.
Posts: 2,158
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Feb 28, 2023 16:00:20 GMT
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Have to cut a 6 inch hole in the roof of the Landy for a vent, I have a Jigsaw, but struggle to make a decent circle in wood, let alone metal!
What's an alternative way to do this?
It's for a solar powered fan/vent to stop the dogs getting cooked!
Thanks
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Last Edit: Feb 28, 2023 16:01:13 GMT by andyborris
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Feb 28, 2023 16:18:13 GMT
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Does it have to be round?
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OGDB
Part of things
Posts: 544 
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Feb 28, 2023 17:01:14 GMT
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Hello Andy.
You’re not a million miles away from me. I could make you up a Jig if you wanted. Hole in the middle that you could pilot and drop a bolt through as a centre point with a small slot for your jigsaw to sit, this way you could use it as a guide to get your hole? Or a series of small holes around a 6” diameter for you to chain drill and then file out?
Other than a 6” hole saw I can’t think of anything else.
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Dez
Club Retro Rides Member
And I won't sit down. And I won't shut up. And most of all I will not grow up.
Posts: 11,712
Club RR Member Number: 34
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Feb 28, 2023 17:36:37 GMT
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If you want it perfect with no skill involved, an mdf template and a nibbler.
I could do it freehand with a grinder, but I’ve had plenty practice. Your results may differ.
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Feb 28, 2023 19:01:11 GMT
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It's easy to warp an unsupported panel with a jigsaw.
Like dez I'd probably use a grinder or nibbler.
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fulvia1436
Club Retro Rides Member
Finally started a thread for my Fulvia life
Posts: 341
Club RR Member Number: 63
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Trepanning tool will do it if you're careful
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'59 Austin A40, '59 VW Beetle, '63 Mk1 Cortina, '57 Austin Gypsy, '68 Fiat 850 Coupe, '68 Alfa Duetto Spider, '72 Lancia Fulvia 1.3S, '73 Lancia 2000 Sedan ie., '72 Lancia 2000 Sedan, '67 Lancia Fulvia 1.3, '83 VW Passat GL5 Estate, '81 Volvo 245 Estate, '85 Lancia Thema 8V Turbo Estate, '99 Lancia Kappa 20V Turbo Estate, '00 VW Sharan VR6, '06 Fiat Multipla 1.9 JTD, '10 Fiat Multipla 1.9 JTD, '66 Lancia Fulvia 1.3
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jimi
Club Retro Rides Member
Posts: 1,814
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I'd be extremely careful using a 6" holesaw on sheetmetal, it can be vicious if it grips, will twist your arms off depending on the torque of the drill.
Last time I did it it took two of us to hold the drill. That was on metal wall panels (sandwich of sheetmetal - fibreglass insulation - sheetmetal) 😉
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Black is not a colour ! .... Its the absence of colour
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andyborris
Posted a lot
Freedom is just another word for nothing left to lose.
Posts: 2,158
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Thanks everyone. Think I'll try a hole saw, but with 2 pieces of ply sandwiching the hole to stop it vibrating.
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I'll second the advice on hole saws snatching, I ended up in the local urgent care centre after an incident with a 4" masonry hole cutter.
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Proton Jumbuck-deceased :-(
2005 Kia Sorento the parts hauling heap
V8 Humber Hawk
1948 Standard12 pickup SOLD
1953 Pop build (wifey's BIVA build).
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braaap
Posted a lot
Posts: 2,592
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Drilling a lot of small holes, big enough for Your (electric) jigsaw blade to fit through, close to the edge of Your 6 inch hole, then jigsawing away the inner part, after that filing or grinding away the rest?
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v8ian
Posted a lot
Posts: 3,758
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Atmo V8 Power . No slicks , No gas + No bits missing . Doing it in style.
Austin A35van, very different------- but still doing it in style, going to be a funmoble
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bricol
Part of things
Posts: 282
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Mar 10, 2023 14:20:48 GMT
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Aroof skin, assuming any stiffeners are well away, should be easily cuttable with a pair of suitable snips - draw your circle, drill hole(s) to get snips in, and start cutting carefully . . .
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