Either go for a circular saw and straight guide rail - Bosch industrial, DeWalt, etc although you will need to build a flat sawing support deck as you won't get a straight cut without it, or switch to buying your materials from someone who will cut it, such as a timber merchant or local workshop. Forget about trying to cut 8 x 4ft sheets on a £250 panel saw - they don't have the power and they're simply too small and unstable to do that sort of job safely. I make furniture for a living and I'll cut most things - for a price, as it takes my time, and time is money. I draw the line, however, at recycled or windfall timber as there might be something embedded which will ruin a blade.
BTW the two best machines to break down sheet stock are a wall saw or a sliding carraige panel saw. The latter has the advantage ipof being able to do mitres and bevel edges, but boy they take up a lot of space.
Scrit
BTW the two best machines to break down sheet stock are a wall saw or a sliding carraige panel saw. The latter has the advantage ipof being able to do mitres and bevel edges, but boy they take up a lot of space.
Scrit