I own a Bosch PST 700PE jigsaw - not top-of-the-range, but not the cheapest either. See first attached image.
My problem is that I can't get it to cut straight even under the most benign of conditions (thin material, well clamped, guided sole plate, good blade, slow cut, no pendulum action). I've read a few other threads in this forum about similar problems, but mostly there is some factor which doesn't apply in my case (I think). I don't expect to get accurate straight cuts in thick/hard material with this saw, but I sure expected better than I'm getting.
I thought it might be a guidance problem, so I made a a jig out of two parallel right-angle steel profiles, spaced apart at exactly the width of the saw's sole plate. You can see this clamped up, ready to cut a line on a length of laminated flooring in the second attached image. (The laminate is thin stuff, about 1/8" thick, or maybe a bit more, & cuts quite easily with a small hand saw).
In the third attached image, you can see the saw in place, sitting snugly in the guide jig, the blade aligned with the cut mark and ready to go. I'm using a Bosch blade, and the pendulum action is OFF. I've removed the plastic blade guard to better see what's going on.
I advance the saw SLOWLY and continuously, at full blade speed. I know from the centre-point mark on the front of the sole plate that the guide jig is keeping the saw body on-track. But after about 2" the blade - although still moving up-and-down within the groove of the guide wheel, has started to deviate to the left. After about 10" I stopped the cut, by when the blade had deviated by about 1/8" off course and was visibly no longer vertical. You can see the resulting cut in final attached image.
Before I chuck this saw in the rubbish bin, can anyone suggest what I'm doing wrong? I don't expect miracles from a jigsaw, but I thought I could expect a straight cut in such thin material and under the conditions I've described
Thanks for any ideas.