Holesaw size for 50mm PVC?

[montiee]

Sounds like a weird question but what size holesaw is best suited so that 50mm pipes can be fed through without too much of a gap. My rough measurement indicates diameter of 50mm pipes is 57mm. Should I get a 57mm holesaw? Will it be too tight or should I go for the 58mm one.

I'm trying to minimise area (gap) around the pipe as I don't want gaps in my fibro walls from going to far. Internal cabinets of course don't matter much but the outside does so if anyone has advice on whats the best size please let me know.

[Barry_White]

montiee

I don't think you are going to buy hole saws that go up in 1mm increments and if you are going to use it to cut a hole in fibro it wont be much good for any thing else unless it is a tungsten carbide one.

If it was me I would be marking the hole with a short piece of pipe and then drill a series of holes with a small tungsten carbide drill bit around the circle and then break the centre out and then clean it up with a rasp to the line.

[wonderplumb]

you can also get jigsaw blades for cutting fibro, if your good enough.

[tricky4000]

Hey I've drilled through fibro sheeting with a hole saw on slow speed. It works. Just don't let the holesaw get too hot...and it doesn't seem to damage the saw at all.

Sorry...off the track a little here.

Montiee is right, you won't find hole saws in 1mm increments.
Dan

[davo2310]

a 57mm holesaw would work, but is there a bend on the outside? cause then you would need to allow for the larger socket if it sits in the hole.....

[thatirwinfella]

a 57mm holesaw would work, but is there a bend on the outside? cause then you would need to allow for the larger socket if it sits in the hole.....


no, you just drill a second hole situated just above the first... the arbor would pierce the sheet just near the edge of the first hole.


after 50mm, i think the next size may be 63mm. that's off the top of my head though, i'm not sure if there is one in between.

[wonderplumb]

I would guess it would also depend on different manufacturers, I have a morse holesaw kit and the 57mm saw will fit 2" DWV snugly but wont allow a fitting whereas my bahco one of the same diametre will allow the fitting in nice and snug. There is also a difference in the way the teeth are splayed between the two.

[davo2310]

No?

maybe......

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And they are only the morse ones, I didnt have the time to look up more, cause it is friday arvo after after all.

anyway, goodluck mate.

oh and they are on the reece cust. website, so the links prob wont work, but yeah they r available

[montiee]

Was in bunnings and they do sell a 57 mm one along with others so you definitely can get them. Wish I bought it while I was there but a mate said he had one at 57mm. In the end it was actually 54mm but I found out after I came back from bunnings and I couldn't be arsed going back. Probably need to rasp it out a bit but at least it's better than drilling a million tiny holes :). Perhaps the teeth will be splayed enough and I'll get away with it..

[peter_sm]

They go up in 1-2mm increments, and as they get larger it becomes 3,4 or 5mm. Just imagine metric equivalents of 1/8" increments, and larger sizes 1/4" increments, plus allow for all the metric 5mm increment sizes inbetween.

A standard holesaw will work fine on fibro, but it needs to be only a few hundred rpm. On and off the drill trigger if you have to, and if it is asbestos sheet, then get a good continuous squirt of water happening on the cutting area too.