Andre Lemos wrote:Thank you for answers guys.
I've found out what the problem was, instead of making a semi-circular movement i just had to lift the A-frame and move it. Somehow, when i made that semi circular rotation the a-frame would be unleveled, don't know why it happens but it does.
Your level might not be calibrated properly. If you label the legs "A" and "B", you want to work across the land such that you pivot on alternating legs. If you're looking up hill and working to the right you'd start with the level in "AB"position and mark your ground position to start. Everything from that point will be level with that spot. Pivot on the B side of your level and then make the next level mark on the A side (which would now be on your right hand side). Then continue by pivoting on the A side. Keep alternating like this til you get to the end of your line. By doing this with a correctly calibrated level you'll eliminate any minor errors. If the level is not calibrated right and you just keep A side on the left and B side on the right without alternating, you'll stack your errors and end up way off contour by the time you get to the end of the line.
Just to double check myself on my A frame level, I made sure the cross piece was level as well and I mounted a small carpenter's level to it. If the bubble and the string agree I know I have it all right.
This may help.
Good luck