Thanks mate. Got to be honest and say I'm not that confident in turning the circular saw upside down and using it as a table saw. I mean it's a great idea, don't get me wrong, it's just that the thought of doing that (and I'm on my own here at the moment so no helping steadying hands available) makes me feel a bit uneasy. :-/
I think you're probably right. I have a router/saw bench which is designed to have a circular saw fitted upside down but it was sucha PITA that I went and bought a proper table saw.
Try ripping a wider piece of stock with the blade set at 45
o with the saw the right way up. Use the edge guide that came with the saw to keep the cut parallel to the edge. Take it slowly and you should be fine. If you can, practice on an old piece of timber first to get the 'feel' for it and to set the saw up to the correct dimensions for what you want to acheive.
At the end of the day, it may be a lot quicker and probably cheaper to go an have a piece cut at the local timber merchant but it is a great feeling, knowing that you have built it yourself from scratch.
Good luck.
