Hello Kenjg, I’m coming back on your question about tolerances and you will find a table explaining the main fittings.
If it’s too complicated use the “H7 hole system” that is the most used and is based on the normalisation of the dimensions of holes to the tolerance H7 ( holes are much more difficult to machine than shafts ) + shafts to be mounted inside with different tolerances from e7 ( sliding ) to p6 ( assembly with press or thermal expansion ).
Small letters are for shafts and capital letters are for holes.
6 is a very precise work, 7 is medium, 11 is a rough work.
principaux ajustements
main fittings
pieces dont le fonctionnement necessite un grand jeu
parts that needa big clearance
dilatation, mauvais alignement, portees tres longues
expansion, bad alignment, very long bearings
cas ordinaire des pieces tournant ou glissant dans une bague
ordinary case of parts sliding in bushing
bon graissage assuré
good lubrication guaranteed
pieces avec guidage precis pour mouvement de faible amplitude
parts with good guidance for low amplitude movements
démontage et remontage possible sans deterioration des pieces
dismantling and reassembly possible without wear of the parts
démontage impossible sans deterioration des pieces
dismantling and reassembly impossible without wear of the parts
l’emanchement ne peut pas transmettre d’effort
the fitting cannot transmit force
l’emmanchement peut tranmettre d’effort
the fitting can transmit force
mise en place possible a la main
assembly possible by hand
mise en place au maillet
assembly with rubber hammer
mise en place a la presse
assembly with press
mise en place a la presse ou par dilatation
assembly with press or with thermal expansion