gd&t- localization tolerance

[MassiVonWeizen]

I think the third datum can be put to have control along the hole axis,
What do you think?

Yes, it could be. I would prefer to put a datum on the surface and a tolerance of perpendicularity on the axis

returning to this statement, these days I am processing for the production of many designs of an external customer in which there are caregivers of localization tolerances.
actually many of these also have the datum reported to the perpendicular surface to the axis (the c of the drawing @since 1996, to make the concept more immediate); As we talk about drawings that for most are carter and sheet metal to me it seems that putting a tolerance 0.2 on a thickness of 2/3mm is a stupid thing that complicates the design because I think it is impossible also to pierce as you can drill with a inclination so as not to respect tolerance.
We also talk about screw housing holes that already have the hole with a lot of game compared to the screw to be inserted, or mounting thread inserts that align with the flatness of the surfaces.
the speech is different if we talk about important thicknesses (>10mm according to me) with tight couplings.

 

[PIETRO2002]

how could be the pin quoted entirely according to me:View attachment 60238

in the treatment description puti: tempering + tempering 55 hrc

 

[simone1996]

@ pietro2002 It is true that this is a mistake, I should also indicate the type of hardening at heart.@massivonweizen yes on carpentry products are fully agreed.
generally when design light carpentry type of the carter, supports, bulkheads or handles of the genus with thicknesses up to 60/10, if I want to have more precision to the assembly redo the diameter of the hole, for example for screw m6 hole from 6,2 / 6,4 or even better seats for screws tsp. for plates with 80/10 thickener, according to me, as you say, the speech changes if you have couplings.

 

[PIETRO2002]

@ pietro2002 It is true that this is a mistake, I should also indicate the type of hardening at heart.@massivonweizen yes on carpentry products are fully agreed.
generally when design light carpentry type of the carter, supports, bulkheads or handles of the genus with thicknesses up to 60/10, if I want to have more precision to the assembly redo the diameter of the hole, for example for screw m6 hole from 6,2 / 6,4 or even better seats for screws tsp. for plates with 80/10 thickener, according to me, as you say, the speech changes if you have couplings.

According to me it is not necessary to indicate hardening at heart, the treatmentist knows, according to the size of the piece and the material (temperature), the parameters to set the oven.
tempering is done to reduce the tensions determined by the tempering so as to reach the required surface hardness.

 

[Maurizio911]

how could be the pin quoted entirely according to me:View attachment 60238

If you want to be precise .. the perpendicularities being indicative of a cylindrical element (both holes or tree) are always anticipated by ø...then ø 0.05.... the "f" goes tiny being tree (the tolerance is however correct).... being three equal holes you can put only one localization tolerance and put the localization value preceded by ø as it is the hole axis that must be understood between 0.03 In addition, quotas 9.85 and 16 and 12.61 must be represented with a rectangular frame. . the wrinkled pins 1.6 must have the discharge for the possible rectification if you do not want to make to 1.6 the plans c and d..se parts from a rough diameter 30 then the quota 30 must be represented in parentheses with the symbol of crude. . last but it is only a personal opinion I find it difficult to conceive an application in which the 3 is in parentheses and the total quota of 32 no... This, however, depends on the application, in fact, it is difficult to understand whether the tolerances of the quotas you have placed are correct without knowing the context in which they are applied

 

[simone1996]

@ pietro2002 more than anything I have based on the drawings that I currently produce at work and that therefore I send in production, I happened the first times to indicate the treatment "tempra 55hrc" and punctually ns treatmentist called to ask what kind of tempra. for me tempra prefigures a heart tempering, for him it could also be induction (with consequent question: and then where do I do it?). to avoid this situation every time, I solve it up like this. @maurizio911 regarding the "f": is a tiny f, it is the font (technic) that does not make much distinction between uppercase and lowercase (the case f is slightly larger). I know it's not correct, but it's not a font I use in a business environment.
As regards the remaining comments, I agree (especially for the discharge throat).
I don't know what kind of application it can have: I was based on the design that he posted at first @raffaelei.
we say however that this design is widely improved !!! :

 

[PIETRO2002]

@ pietro2002 more than anything I have based on the drawings that I currently produce at work and that therefore I send in production, I happened the first times to indicate the treatment "tempra 55hrc" and punctually ns treatmentist called to ask what kind of tempra. for me tempra prefigures a heart tempering, for him it could also be induction (with consequent question: and then where do I do it?). to avoid this situation every time, I solve it up like this.@maurizio911 regarding the "f": is a tiny f, it is the font (technic) that does not make much distinction between uppercase and lowercase (the case f is slightly larger). I know it's not correct, but it's not a font I use in a business environment.
As regards the remaining comments, I agree (especially for the discharge throat).
I don't know what kind of application it can have: I was based on the design that he posted at first @raffaelei.
we say however that this design is widely improved !!! :

the tempering treatment is subtent to heart and is always followed by a tempering at different temperatures according to the hardness you want to get, the tempering should be performed after the tempering so as to avoid any breaks on the pieces.
if you want to make induction tempering, on the design indicate the areas to be treated, depth' and the required hardness.

 

[Therapy?]

how could be the pin quoted entirely according to me:View attachment 60238

the quotas 12,61 and 16 must be framed since they are of reference for the location, to put the reference to the axis is wrong because it is not understood if the reference is the pin d.8 or the pin m5 since the axis is the same : I explain better you should specify which of the two is the reference

 

[Therapy?]

... sorry to add that on localization tolerances lacks the reference plan c or d to specify
should be placed in order c (or d) a and b