bushing tolerance / pin

[deep70]

Hello everyone,
I wanted to put as concisely as possible the following question and know your opinion about it.
in a second arm for a small mini excavator I am challenged the pin joint with the first arm as too precise, I have this data:
tolerance chosen by me: hole ø30 h7 0+0.021, insertion commercial bronzine that as insert hole completed by: ø25 g6 +0.007+0.020, relative pear to be inserted: ø25 f8 -0.020 - 0.053.
tolerance set by the customer: tolerance chosen by me: hole ø30 h8 0+0.033, insertion commercial bronze which as insert hole completed by: ø25 g8 +0.007+0.040, relative pear to be inserted: ø25 e6 -0.040 - 0.061.
I press that I have never had any disputes before using the first tolerances, so I find it strange all this, I think that the game with the tolerances chosen by the customer is excessive, considering then that the movement at that point and almost continuous and therefore at risk of damage. What do you think?

 

[DrBarde]

Is it bronzine commercial? in case you should follow the supplier catalog that surely provides the tolerances for the hole and the pin.

 

[deep70]

Is it bronzine commercial? in case you should follow the supplier catalog that surely provides the tolerances for the hole and the pin.

they are commercial, in fact I follow precisely the recommended tolerances but usually those the same. is the client who claims to be different. .

 

[PIETRO2002]

they are commercial, in fact I follow precisely the recommended tolerances but usually those the same. is the client who claims to be different. .

Unfortunately the customer is always right. you tie the donkey where the same wants to be tied! :

 

[bip]

often in the field agriculture/ground movement you prefer to have a little more wide games, to be cautious from risks of seizing due to dirt or foreign bodies. under minimum material conditions, the game is partially offset by the use of rather viscous fat
know that it is quite normal after a tot of working hours, that the game grows for wear and that the bushings are remade, those who work with excavators know it well, especially on the pins of the buckets, that since maybe they have to be paraded and reinfiled into the yard, if they are too "perfect" do not reinfil them anymore

 

[meccanicamg]

the first tolerances are for clean mechanical applications, with little dust contamination. They are in the iron and steel and such tolerance is normal.
what the customer wants is to avoid sand and fat together. or you do everything ultracyemoratone rectified with expensive materials and addition of uselessly expensive seals, or you give air and amen.
one of the problems is the material of the bronzine. igus patented strange materials to use in cement factories and they are a pleasure compared to the common sintered.