12-10-2014, 06:50 AM
Here's one example of where the "inch" (ANSI) system has it all over the metric (ISO) system.
I much prefer this method of writing the tolerance right there with the dimension. With the ISO shafts and holes tolerance system, you get a letter and numerical character pair for each, and it's hard to remember upper or lower case, which (shaft or hole) gets which, and what value is assigned to each. If you want to know the size, you have to go to a chart. As the range of diameter of the hole or shaft changes, the value of that alphanumeric character set changes too. How ingenious.
Just put the dimension you need with the high and low limit right on the print please.
I much prefer this method of writing the tolerance right there with the dimension. With the ISO shafts and holes tolerance system, you get a letter and numerical character pair for each, and it's hard to remember upper or lower case, which (shaft or hole) gets which, and what value is assigned to each. If you want to know the size, you have to go to a chart. As the range of diameter of the hole or shaft changes, the value of that alphanumeric character set changes too. How ingenious.
Just put the dimension you need with the high and low limit right on the print please.