On 10/10/2017 15:19, ss wrote:
Twinwall:

What best to use, if possible I dont want to buy as it is a one off job.
from a 2 metre sheet I want to cut 3 x2x2 foot squares.
Tools at hand:
Blunt tenon saw, angle grinder, normal saws, circular saw 48 tooth,
Multi tool, stanley knife,jig saw with various blades.

My solution to this was to clamp two lengths of floorboard either side
on the twinwall and use the finest toothed manual saw that I had
available moving fairly slowly to avoid melting it and clogging the saw.

Clamped on the keeping side about 1cm away from the line of the cut.

Worked well enough for me on 3m long cuts. It cuts reasonably well once
the thing has been made rigid by clamping it to wooden planks. Otherwise
it flops all over the place making it hard to cut. If it snatches then
there is a risk of fracture so take it easy with the saw pressure.

--
Regards,
Martin Brown