The most common tolerance on a finished hole is H7. Your machining tolerance of +/-0.1mm is literally completely off the chart for all diameters of H7 hole.
If the basic machining accuracy is this sloppy, I can't see how can I order parts from you that need to fit together properly as a working mechanism.
Can anything be done about this?
I would also like to know the answer to above - So far the parts I have received have been to a tolerance which exceeds the quoted 0.1mm however I generally send parts to other suppliers which require a better, specified and checked tolerance. It would be of great advantage for your customers if specific features could be assigned a tolerance target. Do you also accept drawings to make this possible?