choice for bearings

[Luca24]

Hi.

I have difficulty in choosing the tolerances to be applied in this coupling.
grey/beige sx frame is fixed, while the tubular with welded bushing is mobile, and works with a width of about 60o forward and back.
I would like to know what tolerance I have to put in the welded bushings to the tube (2 bearings) and that tolerance on the pin that fits inside (I would opt the classic h7/h6) and tolerances for the bushings (1-2) where it supports the pin.
Thank you very much

 

[Chris_BRB]

boccola seat tolerances are available in the catalogue (selfoil for example as a manufacturer). As for the bearings, what you have to do doesn't seem like a heavy application at all... also h7-h7 goes well

 

[Luca24]

the bushing will not be commercial, will be made to measure in c45.
pin at the moment I put 25 h7 in c45.
and bushing (1-2) 25 f7 (+0,02 +0,04)
I miss tolerance seat bearings on boccola 3.
Can they be okay for now?
Thank you.

 

[Chris_BRB]

h7 in the bushing can go, but you have to put seegers on the tree to avoid axial sliding of the same.
boccola hole h7. must be mounted blocked with interference, look at some catalog regardless of whether it is commercial or not, it is important to understand the operation of things. deforms slightly and remains stuck with the h7 tolerance. Therefore the internal ø shrinks slightly from g goes to h usually

 

[Luca24]

the two bearings in the bushing 3 are well blocked in place with tolerance m6 (0,-0.03) and pin 25 h7 to be threaded with stud.
I’m a little in trouble

 

[Chris_BRB]

with the inner pins for the bearings in the Bush 3 and if you put the seeger on the tree from both sides does not go anywhere, so it seems. Then it depends whether you have forces at stake important or not, you did not specify that

 

[Marco F inox]

hi, the optimal operation of this mechanism, previews the block of the bearings in the seats part. 3, this because it is on this ring that the load rotates.
the pin 4 has a lamatura in the head, which must be exploited and which serves to avoid its rotation.
the pin nut must only serve to avoid the parade.
Therefore, the bearings must not be compacted, especially the two of the tube, but only to insert spacers to avoid their parade from the bearings, and to ensure that there is no collision between the moving organs.
Usually you prefer to work with the basic hole system, also because there are already measuring alestors, so holes 1 and 2 would do them in h7. I would then give the toleration to the pin, which is also good for the part in contact with the bearings.
tolerance m6, does not provide a zero deviation, the only position of tolerance that has zero deviation, is h (lower for holes) and h (higher for trees).