To begin cutting your strips lay your fabric out on a flat cutting surface, preferably a cutting mat that has cutting grids. Make sure that the selvage edges are lined up and that the fabric is wrinkle free. Iron the fabric if necessary.
Line the cutting guide up so that one end of the fabric can be squared off. To do this use the grids on the cutting guide and line up a horizontal line with the selvage edge and the cutting side so that you can see a small section of fabric. Hold the cutting guide in place, don't let it slip, and pass the cutter across the fabric. Your end should now be square.
Now turn the cutting guide around and begin cutting the strips to the desired width. Make sure that the horizontal line lines up with the selvage edge. Hold the cutting guide in place, don't let it slip, and pass the cutter across the fabric.
You will need to check the fabric every strip or two to make sure the fabric is still square. This is an important step and should not be ignored. If the cuts get out of square and you continue to cut strips, it will affect the look of your strips and the look of your quilt top.
You will follow the same procedure when you cut strips from the strips you have sewn together. The first step is to square off the end .This is assuming that you have ironed all of the seams flat. The seams have to be flat in order for you to make accurate cuts.
Line up the cutting guide with one horizontal line at the selvage edge and another horizontal line across the seam of the strip. Line up as many seams and horizontal lines as possible. Hold the cutting guide in place, don't let it slip, and pass the cutter across the fabric. Your end is now square.
Once the end is squared, turn the cutting guide so that you can cut the strips to the correct width. Line up the lines on the guide down the squared edge of the fabric at the correct width.
You also need to make sure the horizontal lines are square to the seams in the strip. This ensures that the strips you are cutting are square. Having accurate, square strips will ensure your quilt top goes together correctly.
Hold the cutting guide in place, don't let it slip, and pass the cutter across the fabric. Before cutting the next strip, check to make sure the end is still square. You will need to do this repeatedly so that you are sure your strips are straight.
When you are making a quilt with large blocks it may become necessary to have strips that are very wide.
The procedure for cutting them is the same as outlined above, square off the end, cut the strips carefully by lining up the horizontal lines on the cutting guide, and not letting the fabric slip.
It is even more important to check the strip for square after each cut.
An alternative to cutting method is to fold the strip so that it is not as wide. You need to fold it right side to right side on a seam line. This allows you to cut a very wide strip with a shorter cutting guide.
You need to make absolutely sure that the seams are flat and that the edges line up and do not slip while cutting. This is actually much harder to do than cutting the full width. If you chose to do this be very careful.
Folding the fabric from both sides to make the strip even narrower is another option. Again, this is very difficult to get right, you have to be very careful and keep everything in line.
Pin basting the seam lines beyond where you are going to cut will help. You should check the strip to make sure it is square after every cut.