Fitting the Glass to the Cartoon
Often you find that the next piece of glass does not fit properly. Possibly it rocks a bit in the came’s channel. Possibly it is simply just a little too big. Wait! Don't adjust the piece just yet. It may not be the problem.
The first thing to do is to take the too-large piece of glass out and remove the came it fits into, to ensure the previous piece of glass is not too large. The glass should not overlap the cut line. If you have drawn your cut lines to 1.2mm (1/16”) you should see only the faintest line of paper between the glass and the dark cut line.
If the glass seems too large, check that it is firmly in the channel of the previous came, as sometimes the glass catches on the edge of the came and does not go into the channel.
If that piece seems too large, the next check is to determine whether the apparently too large piece of glass really fits the cartoon cut lines. Place the glass inside the cut lines. You should see a faint line of paper between the glass and the cut line.
When you are sure both pieces of glass are the correct size, put the came back between them and check again. If the glass is still too large, check the length of the came. Make sure the came butting onto the came separating the glass is not too long. This is a common reason for lead panels to grow beyond their initial dimensions.
If the glass is the correct size and the butting cames are correct, replace the came. Put the too large piece of glass into the came and position it so it has the best fit to the next cut line.
The first thing to do is to take the too-large piece of glass out and remove the came it fits into, to ensure the previous piece of glass is not too large. The glass should not overlap the cut line. If you have drawn your cut lines to 1.2mm (1/16”) you should see only the faintest line of paper between the glass and the dark cut line.
If the glass seems too large, check that it is firmly in the channel of the previous came, as sometimes the glass catches on the edge of the came and does not go into the channel.
If that piece seems too large, the next check is to determine whether the apparently too large piece of glass really fits the cartoon cut lines. Place the glass inside the cut lines. You should see a faint line of paper between the glass and the cut line.
When you are sure both pieces of glass are the correct size, put the came back between them and check again. If the glass is still too large, check the length of the came. Make sure the came butting onto the came separating the glass is not too long. This is a common reason for lead panels to grow beyond their initial dimensions.
If the glass is the correct size and the butting cames are correct, replace the came. Put the too large piece of glass into the came and position it so it has the best fit to the next cut line.
The temptation is to trim the glass to the amount of overlap of the cartoon line.
Note the extent of the overlap of piece #7 on the right.
In the above photo it would seem to be easy to just trim the straight line off the piece. If you look carefully at the left side of the piece, you will see a gap between the glass and the lead came. This means something more is happening than just being too large. If you were to cut the glass down to fit within the cartoon line at this point you would find it too small in the end.
To find out what is going on underneath the lead came, you will see that I have made a line with a felt tip pen at the edge of the came.
When pulled out from under the came the line shows there is more glass under the came at the lower left than the middle left. This indicates that the lower left needs to be adjusted rather than the right edge.
Groze or grind the glass to an even amount of glass between the felt tip line and the edge of the glass. This may have to be done several times to get the proper fit. In this case I used the grinder because of the extreme texture of the glass.
This photo shows the glass fits at the bottom right, but needs more adjustment at the top right. But it does fit under the came at the left side now. The amount of adjustment can be judged by marking the glass and grinding a portion away to fit.
When you have reduced the "high" spots on the glass so it fits under the came evenly along its length, you can begin to adjust the outer edge, if necessary.
No comments:
Post a Comment