Hole cutter

[kellys_eye]

I've got a box full of these soffit vents to fit:

http://www.toolstation.com/shop/Roofing ... tem_detail

I know the description say they are 70mm diameter but that's their FULL diameter - the correct size press-fit hole is 65mm.

I have a set of Bosch hole cutters (quick change) but the nearest size is 64mm and I can't get the vents into a 64mm diameter hole for love nor hammering.....

I can't get hold of a 65mm hole cutter for the Bosch either (searching Screwfux for "hole cutter 65mm" returns a communications headset FFS ) - so, am I not hammering hard enough or is a 65mm hole cutter going to set me back 10x what I paid for the whole Bosch set?

Any advice please????

[steviejoiner74]

I use a screwfix 64mm erbaur(think that's how you spell it?) hole cutter and the vents fit nice and snugly. You can use a circular motion when drilling if they are tight.

[Chris Skilbeck]

I've found the same a steviejoiner, a 64mm hole usually works ok, I suppose it may depend a bit on the particular make of vent - but if yours really won't work, then -

Buy a cheapish 64mm hole saw - every manufacturer seems to do a 64mm - and with a saw-setting tool just turn the teeth out a touch. (or is it only me who still has a saw-setter?) If you haven't got one, ask an older carpenter. Actually, you may be able to bend the teeth out a touch with a decent pair of long-nose pliers)

OR - this may sound silly, but it could work - do you have an old drill with a wobbly chuck? If you do, stick the 64mm hole cutter in it and try it - the resulting hole should be a bit on the generous side.

[Chappy]

Or 64mm then a dremel with a sanding drum on it.

[ayjay]

..........or buy an adjustable tank cutter.

tank_cutter.jpg (29.84 KiB) Viewed 3399 times

[FFX]

Hi,

There are a few manufacturers that do a 65mm holesaw - Bahco, Starret, Spectrum, Draper Expert, Irwin

We don't currently have many in stock, but you can see what we do have http://www.ffx.co.uk/tools/refine/K=65m ... =_S=/1/2/1

Hope that helps,

Regards
Ian

[adonis]

What about putting the vents in the freezer for a while, it might be just enough to make them fit.

[steviejoiner74]

We try not to use these soffit vents at all and use an over fascia vent instead,much quicker and tidier.

[kellys_eye]

Some great replies - thanks

@ SJ - circular motion? I'll give it a go.
@ CS - yes, I actualy DO have a sawtooth set tool! The teeth on the Bosch are quite hard and may break but if I can dig out an older cutter it may be possible.
@ Chappy - aye right..... for ONE hole maybe, but I have 70 of these to fit!
@ ayjay - yup, thought of getting one of those too, any excuse to buy more tools
@ FFX - nice selection of stuff! Bookmarked and on standby waiting for the other suggestions to fail miserably
@ adonis - plastic 'shrinks' in the freezer? I think not.
@ SJ - I already have the vents BUT would consider alternatives if they are easier to work with. Got a link?

once again, I thank the participants

[steviejoiner74]

The over fascia vents simply nail/screw on top of the fascia board prior to tiling/slating and felting. If you've already got that done it's not worth taking off a row of tiles and peeling back the felt.

[rough cut]

i'm 99% sure that a 70mm hole is the size to drill for these as i bought the bosch quick change bit to fit them from tool station when i bought these for a job i was doing a few months ago

[steviejoiner74]

i'm 99% sure that a 70mm hole is the size to drill for these as i bought the bosch quick change bit to fit them from tool station when i bought these for a job i was doing a few months ago

I'm 100% sure Kelly's eye doesn't require a 70mm hole saw!

[rough cut]

i'm 99% sure that a 70mm hole is the size to drill for these as i bought the bosch quick change bit to fit them from tool station when i bought these for a job i was doing a few months ago

I'm 100% sure Kelly's eye doesn't require a 70mm hole saw!

i just tested the ones i got from tool station and they fit the 70mm hole i just drilled in a piece of ply and putting a tape across the back of the ones i got they are 70mm i dunno if there is a difference but i got the white ones from toolstation and that was the size cutter they said i needed and it worked lol