now let's make this bed a little bit trickier let's suppose we have to bend a four point saddle over an object but we work from a fixed point that means we have to calculate for shrinkage on a distance so let's learn how to do that right now we have the same situation that we have with having to go over this block which is eight inches high 16 inches wide and the center of our block is 36 inches from the fixed point which is the edge over here so that's the first number we need to know for our calculation so let's go and Mark our pipe 36 inches okay now remember from earlier that the shrinkage on a thirty degree Bend is 1/4 inch of shrinkage for every inch of depth now we know our block is 8 inches in depth so 8 times 1/4 of an inch eight quarters of an inch is 2 inches so we need 2 inches for shrinkage so we add two inches 236 which makes 38 now the reason that we add the two inches okay and now we have to make some marks for our first Bend now we know once again the depth of our offset is 8 inches we know the multiplier for a 30-degree angle is 2 8 times 2 is 16 so we mark from this mark now 16 inches to get the mark for our first Bend airbend and again i've done a good for about 22 degrees or so a little bit further and once again I'm going to turn this over put this down on the ground finish this off looks like a little more okay here's the center mark where we go out for our shrinkage and we're over the center of the block here's the original mark and we notice that were about two inches away from the center of our block and this is why we had to go out with a shrinkage now if we go further back and look at our offset our saddle we can see