Most of the tolerances use lower case but some are upper case, I dont know if that makes a difference or not. A keyway has a N9 and the internal keyway has a j59. One of the external shafts has a f9 while most of the other shafts have a h9 or h6. Could anyone offer a simpler explaination of what I am seeing. The parts are shafts and couplings and have to fit bearings so I know some of the tolerances are going to be plus and some are minus.
ISO 2768 MK FULL
I do not have a full copy of the DIN but I do have some notes and a brief discription of how the tolerances are supposed to work but I still dont quite understand it. I have some drawings from Germany that use the DIN 2768 tolerances and I am having trouble understanding it correctly.
ISO 2768 MK ISO
GENERAL TOLERANCES FOR LINEAR AND ANGULAR DIMENSIONS (DIN ISO 2768 T1) - I have several booklets on GDT and similar subjects but nothing on the european or DIN standards. ISO 2768 is used to define the general tolerance on sheet-metal and plastic parts. For sheet-metal parts ISO 2768-m and for plastic parts ISO 2768-f is used as general tolerances This part of ISO 2768 is intended to simplify drawing indications and it specifies general tolerances for linear and angular dimensions without individual tolerance indications in four tolerance classes. The +43 on the h9 tolerance is definitely wrong, all the h tolerances are +0 and a negative number.
It applies to the dimensions of workpieces that are produced by metal removal or are formed from sheet metal. It contains three tables and an informative annex with regard to concepts behind general tolerancing of dimensions. If anyone knows of a techical reference that might be more inclusive and useful I will gladly pay a little for the effort to copy and email or mail it to me. GENERAL TOLERANCES FOR LINEAR AND ANGULAR DIMENSIONS (DIN ISO 2768 T1)
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