markharro Posted January 28, 2023 Share Posted January 28, 2023 This will be for MVHR ducts through ext wall. I was thinking a jigsaw would be the simplest option? Link to comment Share on other sites More sharing options...
Onoff Posted January 28, 2023 Share Posted January 28, 2023 Hole saw? https://www.rennietool.co.uk/products/hss-m35-cobalt-bi-metal-holesaws Link to comment Share on other sites More sharing options...
jamieled Posted January 28, 2023 Share Posted January 28, 2023 I butchered it using a multitool. Link to comment Share on other sites More sharing options...
saveasteading Posted January 28, 2023 Share Posted January 28, 2023 Def worth using a hole saw. Neat and quick. Link to comment Share on other sites More sharing options...
markc Posted January 28, 2023 Share Posted January 28, 2023 Another for holesaw. Don’t get one of the cheap trepanning cutters (bar with one or two cutters you can adjust) Link to comment Share on other sites More sharing options...
Radian Posted January 28, 2023 Share Posted January 28, 2023 Er, does a 210mm hole saw even exist? Link to comment Share on other sites More sharing options...
markharro Posted January 28, 2023 Author Share Posted January 28, 2023 It does indeed - check the useful link above.... 1 Link to comment Share on other sites More sharing options...
Onoff Posted January 28, 2023 Share Posted January 28, 2023 26 minutes ago, Radian said: Er, does a 210mm hole saw even exist? Right up to 250mm on that link. 1 Link to comment Share on other sites More sharing options...
Thorfun Posted January 29, 2023 Share Posted January 29, 2023 For the cost of the hole saw I’d be using a jigsaw. In fact, that exactly what I did and it all worked out well! Link to comment Share on other sites More sharing options...
Onoff Posted January 29, 2023 Share Posted January 29, 2023 7 hours ago, Thorfun said: For the cost of the hole saw I’d be using a jigsaw. In fact, that exactly what I did and it all worked out well! Surely for the cost of the electricity you'd have used a pad saw? 😂 1 Link to comment Share on other sites More sharing options...
markharro Posted January 29, 2023 Author Share Posted January 29, 2023 Well I'm the proud owner of a padsaw and jigsaw so all of this is opening up endless possibilities...dont begrudge the cost of proper tools but I'm tending to agree with @Thorfunthat jigsaw with fine blade is the way forward. Another question however - cutting one hole in either the internal or ext OSB will be easy - but how best to cut the matching one so it mates properly in the horizontal and vertical planes? Link to comment Share on other sites More sharing options...
Thorfun Posted January 29, 2023 Share Posted January 29, 2023 24 minutes ago, markharro said: Well I'm the proud owner of a padsaw and jigsaw so all of this is opening up endless possibilities...dont begrudge the cost of proper tools but I'm tending to agree with @Thorfunthat jigsaw with fine blade is the way forward. Another question however - cutting one hole in either the internal or ext OSB will be easy - but how best to cut the matching one so it mates properly in the horizontal and vertical planes? can't help with that as I only had external OSB but my normal procedure is 'wing it and hope for the best'. Link to comment Share on other sites More sharing options...
dpmiller Posted January 29, 2023 Share Posted January 29, 2023 long drill bit, even a masonry one will get through 10mm of OSB. Link to comment Share on other sites More sharing options...
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