Bending jigsaw blades

Once you put any sideways force on a jigsaw blade it will bend and you won't get a square cut any more.

Cut by hand using a panel saw?

Isn't this the type of job for a big handsaw?

newshound snipped-for-privacy@stevejqr.plus.com> wrote in news: snipped-for-privacy@brightview.co.uk:

A power tool is not the answer to every task.

Chainsaw?

Our builder got fed up with constantly cutting Celotex one day and just blasted through the sheets with a chain saw.

Quick and effective but it did look as thopugh it had been snowing.

Cheers

Dave R

bought

Or score and snap. Works at 25 mm not tried 75 mm that might be to thick or require to much force over a too long a distance.

I used an old bread knife - works well.

The best are those with actual serrations, and a mix of serration pitches: f f f f m f f f f m f f f f m f f f f m f f f f m f f f f m f f f f m f f f f m IYSWIM

The more modern wavy edge ones are less good for this.

I've found that a Stanley floorboard saw is good for fine-ish work. My backsaw was to limited for the cuts and the Stanley is finer and thin but not much kerf.

Hmm, I used to love my jigsaw attachment for my drill. As long as the guide was well pressed to the surface you could cut some lovely shapes with it I found. But oh the dust!

Brian

Try steering the jigsaw by rotating it slightly in the vertical axis and always only applying force in the exact direction the blade is aligned to. Don't apply any sideways force, which you might be doing instinctively.

Bill

Or do yourself a bigger favour & don't use a jigsaw.

NT

This look quick, and less mess.

tape - Perfect Insulation with PIR Board

Looks expensive and convoluted - I just use expanding foam if the fit isn't perfect (which it rarely is in an old property), finishing with aluminium tape. And cut with kitchen knife, as above.

Mind, I can see how all of that kit might be justified if doing it for a living.

Its another of those demonstration videos on youtube where it is made to look easy because everything is square and uniform.

I have used those bosch blades for cutting 70mm quinntherm and they worked fine for me.

Another method is to turn the back edge of a hacksaw blade into a sharp knife and make a handle for it. By pulling through the 'celotex' at 45 degrees an accurate cut is easy.

For 50mm celotex a stanley knife with a longer blade is perfect for a clean cut.

If you watch earlier Robin Clevett videos on this build you'll see why everything is square and uniform.

He just seems to have a perfect eye for level, square, and everything in between. I like this one: