Print Requirements

[shame152]

I would like to find a good resource for print standards. Today I was informed that I'm stupid because, while re-drafting a 10 year old print I left some crowded and redundant information off.


The print read:


#7 TAPDRILL 1.0 DEEP


1/4-20 UNC 2B P.D..2175-.2224 .9 DEEP MIN.


I changed it to:


DRILL 1.0 MAX x


1/4-20 2B .9 x MIN





(I hope the little depth arrow shows up or you'll just see an x.)

 

[caddie]

Standards. Very good with standards as there are so many to choose from...


Standards come in many flavours. In europe we have the ISO standard, that is broken in to maybe a national standardand then every company takes the national/international standard and crafts their own standard: "Volvo standard", "Saab standard", "ABB standard"... you get the picture. (Note: I am not working for any of these companies).


Tosay what is correct for your company would be impossible, even if I sent you the worlds collected standards. You will have to look withinyour own company. Does it have it's own (flavoured) standard or does it use a national/international standard?

 

[vlad1979]

If you have a specific requirement for a project, like Caddie said you should follow it's own standard.


If not then you should follow ASME Y 14.5M-1994. This is an international accepted standard.

 

[dr_gallup]

It is not enough to just use standards. You must specify on your drawing what standards you are using and if it is not a commonly available international standard you must supply the standard so people can comply with your print. We have a company standard which explicitly states which standards we use as well as any exceptions or stipulations.

For instance for the (IMHO totally FUBAR) ISO 8015:1985 Fundamental Tolerancing Principle we have to stipulate that we invoke the envelope requirement for all drawings per ASME 14.5M - 1994. This completely changes the definition of allowable form.

For surface texture we have to specify the ISO 1302:1978 revision because they completely hosed the spec when they revised it. The current version only requires 84% of the surface to meet the requirement. What good is that if I'm trying to make an o-ring seal? It's OK sir, only 16% of your o-ring is leaking fuel onto your hot exhaust. ISO said that's OK!!!

 

[dr_gallup]

I would like to find a good resource for print standards. Today I was informed that I'm stupid because, while re-drafting a 10 year old print I left some crowded and redundant information off.


The print read:


#7 TAPDRILL 1.0 DEEP


1/4-20 UNC 2B P.D..2175-.2224 .9 DEEP MIN.


I changed it to:


DRILL 1.0 MAX x


1/4-20 2B .9 x MIN



(I hope the little depth arrow shows up or you'll just see an x.)

I would not normally put standard tap drill or pitch diameter info on a drawing because as you said that is redundant since the thread spec covers it. You do need to put the UNC in the callout.