I was cutting down a 4 by 8 sheet of birch faced plywood and both the jigsaw and circular saw cut crooked.  I clamped a 2 by 4 guide and it still cut the other way.  If i was to use another guide on the other side and make a path, would that work?  Why are my brand new blades cutting WAY off???

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jeff-o7 years ago
One other thought, how strong are your clamps?  If they're not strong enough the combination of putting force on them and the vibration from the saw will cause them to shift, causing the line to go off-center.
Burf7 years ago
Power saws always tend to drift away from your strong hand side towards the opposite hand and when you try to pull it back on line, it makes your cut wavy.
To counteract this, if you are right handed, clamp your straight edge on the left hand side of the saw, that way the saw table is held in place by the straight edge, resisting the natural tendency to drift that direction.  If you are a lefty like me, clamp the straight edge on the right side.
Re-design7 years ago
Cut very slowly, use both hands on the circular saw.  If it's still cutting off the line try another blade.  Did you put the new blade on the right way so that the teeth are cutting instead of rubbing?
jeff-o7 years ago
So help me understand, the saws are pulling to one side or the other?  It seems odd that both would be doing that.  Did these saws cut straight in the past?  Do they cut other boards properly?

It would be good to figure out whether it's the saws, the blades or the wood that are causing the trouble.
acidbass7 years ago
 steve has said it but did you replace the blade recently if you have you need to take it out then put it back in properly the only thing i can think of is that you blade was replaced crookedly
Practice on a piece of scrap, and twist the blade holder to MAKE the saw track straight against your 2x4