GB/T1804-m

Anyone familiar with this? I have a print from a customer with the
note "DIMENSIONS WITHOUT TOLERANCE ARE ACCORDING TO GB/T1804-m." The
part is a simple sheet metal angle so I'm not too nervous, but we've
been bit before with unclear standards. I googled GB/T1804-m and
didn't find anything useful.

Thanks in advance for any help. Diego

 

This type of thing happens to me all the time...Odd spec callouts usually
turn out to be your customer's internal documents/standards that you would
know nothing about. Most companies create internal standards
documents....Anyway, your best bet is to call up your customer for their
spec that should have been included when they submitted the job.

IYM

 

Appears I was wrong....Good find...Any day you learn something new is a good
day

I didn't know the Chinese had standards except with lead based paint!
<joke>

IYM

 

Thanks Keith. Please excuse my ignorance but this link opens a Word
document with SimHei font. All I see is a few lines of English and
then rows of squares representing text. Is there a translated version,
or a font that displays this document in English?

Diego

 

the docuiment opened for me with a combination chineses & english
characters.
i translated via http://babelfish.altavista.com and got the following.

People's Republic of China country standard The general common difference
has not poured the common difference the linearity and angle size common
difference General tolerances Tolerances for linear and angular dimensions
without individual tolerance indications GB/T 1,804 ?2,000 eqv ISO 2768-1:
1,989 Replaces GB/T 1804-1992 GB/T 11335-1989 1 scope this standing
operating procedure has not poured leaves common difference linearity and
the angle size general common difference grade of tolerance and the limit
deviation value. This standard is suitable for the metal machining size,
also is suitable for the general ramming processing size. The nonmetallic
material and other technique processings sizes may refer to the use. This
standard is only suitable for following has not poured the common difference
the size: A) linear dimension (for example outside size, ???, steps and
ladders size, diameter, radius, distance, ?? radius and bevel edge highly);
B) the angle size, including usually does not pour leaves the angle value
the angle size, for example right angle (90°); GB/T 1,184 mentions or and so
on the polygon angle is an exception; C) machining group support linearity
and angle size. This standard ill uses in the following size: A) other
general common difference standards involve linearity and angle size; B) in
parenthesis reference size; C) rectangular ?? in theory correct size. 2
quotations standards following standard contains the article, through quotes
when this standard constitutes for this standard article. this standard
publication, shows the edition for to be effective. All standards can
revise, use this standard all quarters to be supposed to discuss the use
following standard newest edition the possibility. GB/T 1800.l ?1,997 limits
and coordinate foundation l partial: The glossary GB/T 1,184 ?1,996 shapes
and the location tolerance have not poured the common difference value (eqv
ISO 2768-2: 1,989) GB/T 4,249 ?1,996 common differences principles (eqv ISO
8,015: 1,985) the GB/T 6403.4 ?1,986 components ?? 3 define 3.1 this
standard with the bevel edge to use the related terminology and the
definition which GB/T 1800.1 produces. 3.2 general common differences
general tolerances refers to the common difference which may guarantee under
the workshop usual processing condition. Uses the general common difference
the size. not to have to pour after this size leaves its limit deviation
value. Note: Appendix A (prompt appendix) has produced the general common
difference concept and the explanation. In when 4 general rules selections
pattern has not poured common difference the size general common difference
grade of tolerance, should consider the usual workshop precision and by the
corresponding technical article The national quality engineering supervision
bureau 2,000 ?07 ?24 authorizes 2,000 ?12 ?01 implementations Or the
standard makes the specific stipulation. To any sole size, like in the
function requests compared to a general common difference smaller common
difference or permits a bigger common difference and the more economical
time. its corresponding limit deviation must after the related basic size
the note to leave. Uses this standing operating procedure when the pattern
or the related technical document the linearity and the angle size general
common difference, should carry on the sign note according to this standard
6th chapter of stipulation. (For example cutting and casting) separately
process between two surfaces by the different type craft which forms not to
pour the common difference the size to be supposed according to in the
stipulation two general common differences value greater value control. The
general common difference stipulated which by the unit of angular
measurement only controls superficial the line or ??the total direction,
does not control their shape error. The line total direction obtains which
from the actual surface is the ideal geometry shape ???the direction. ???and
between the actual line maximum range is the smallest possible value (to see
GB/T 4249). 5 general common differences grades of tolerance and limit
deviation value general male difference precise f, medium m, rough c,
thickest v altogether 4 grade of tolerance. According to has not poured the
common difference the linear dimension and the angle size has separately
produced various grade of tolerance limit deviation value. 5.1 linear
dimension table 1 has produced the linear dimension limit deviation value;
Table 2 has produced ?? the radius and the bevel edge highly size limit
deviation value. Table 1 linear dimension limit deviation value mm grade of
tolerance basic size partitions 0.5 ~ 3 3 ~ 6 6 ~ 30 30 ~ 120 120 ~ 400 400
~ 1,000 1,000 ~ 3,000 2,000 ~ 4,000 precise f ±0.05 ±0.05 ±0.1 ±0.15 ±0.2
±0.3 ±0.5 ?medium m ±0.1 ±0.1 ±0.2 ±0.3 ±0.5 ±0.8 ±1.2 ±2 rough c ±0.2 ±0.3
±0.5 ±0.8 ±1.2 ±2 ±3 ±4 to be thickest v ?±0.5 ±1 ±1.5 ±2.5 ±4 ±6 ±8 Table 2
?? radii and the bevel edge highly size limit deviation value mm grade of
tolerance basic size partition 0.5 ~ 3 3 ~ 6 6 ~ 30 30 precise f ±0.2 ±0.5
±1 ±2 medium m the rough c ±0.4 ±1 ±2 ±4 thickest v note: ?? the radius and
the bevel edge high meaning see also GB/T 6403.4. 5.2 angles sizes table 3
has produced the angle size limit deviation value, its value according to
angle leg of right triangle length determination. to ??? according to
circular cone ??length determination. Table 3 angles sizes limit deviation
value grade of tolerance length partition, mm ~ 10 10 ~ 50 50 ~ 120 120 ~
400 400 precise f ±1°±30 ' ±20 ' ±10 ' ±5 ' medium m rough c ±1°30 ' ±1°±20
' ±15 ' ±10 ' is thickest v ±3°±2°±1°±30 ' ±20 ' 6 general common
differences pattern methods of portrayal if use this standing operating
procedure the general common difference, should nearby the pattern title
block or the specification, the technical document (for example enterprise
standard) center the note leaves this standard number and the grade of
tolerance code number. When for example in selection rank, the sign note is:
GB/T 1,804 ?m 7 determinations except has the stipulation in addition,
surpasses the general common difference the work piece like not to achieve
when harms its function, usually should not determine refuses to accept
(sees A5). Appendix A (prompt appendix) linear and the angle size general
common difference concept and explained A1 constitution components all
essential factors always have the certain size and the geometry shape. As a
result of the size error and the geometry characteristic (shape, direction,
position) the erroneous existence, will have to perform for the guarantee
components use function to them to limit, surpasses can harm its function.
Therefore, the components express in the pattern all essential factors all
have the certain common difference request. The not special request
essential factor may produce the general common difference to the function
in. The general common difference may apply in geometry essential factor and
so on the linear dimension, angle size, shape and position. Uses the general
common difference the essential factor to be possible not the independent
note to leave its common difference in the pattern, but is in the pattern,
the specification or the technical document (for example enterprise
standard) center makes the always explanation. The A2 linearity and the
angle size general common difference is under the workshop ordinary craft
condition, the engine bed equipment may guarantee the common difference. in
the normal maintenance and the operation situation, it represents the
workshop usual processing precision. The general common difference grade of
tolerance common difference value conforms to the usual workshop precision.
According to components operation requirements selection corresponding grade
of tolerance. The linear dimension general common difference mainly uses in
the low accuracy non- coordinate size. Uses the general common difference
the size in under the normal workshop precision guarantee condition,
generally may not examine. A3 to some definite common difference value,
enlarges the common difference usually certainly not to be able to be
economical in the manufacture. For example is suitable "the usual medium
precision" the level workshop to process the 35mm diameter some essential
factor, stipulated ±1mm the limit deviation amount usually cannot bring a
bigger benefit in the manufacture to the workshop, but selects ±0.3mm the
general common difference limit deviation amount (center rank) is enough.
When in the function permits the common difference was equal to when or is
bigger than the general common difference, should use the general common
difference. Only has works as essential factor function permission compared
to general common difference big common difference, but this common
difference when the manufacture is more economical than the general common
difference (for example when assembly drills ?? depth), its corresponding
limit deviation value must the note leave after the size. Because in the
function need, some essential factor request uses compared to "the is
ordinary common difference" the small common difference value, then should
the note leave its corresponding limit deviation value after the size.
Certainly this has not been the general common difference the category. A4
uses the general common difference below, may bring the advantage: A)
simplifies the charting, ?? is clear legibly, but highly effective carries
on the exchange of information. B) saves the pattern design time. Designs
the personnel not to need to consider one by one or the computation common
difference value, only must understand some essential factor in function
whether allows to use is bigger than or is equal to the general common
difference the common difference value. Which essential factors c) was the
pattern clear about to be possible to guarantee by the general technological
level that, might simplify the examination request, was helpful to the
quality control. D) has highlighted the pattern ?? common difference size,
these sizes mostly are important also need to control, causes when the
processing and the examination takes and makes the plan arrangement. E)
because signed in front of the contract on already to know the factory "the
usual workshop precision", the buyer and the supplier could conveniently
carry on the ordering negotiations; Simultaneously the pattern expressed the
integrity also may avoid when the delivery buyer and supplier's argument.
Only has the specific workshop the usual workshop precision reliably
satisfiedly to be equal to when or to be smaller than the general common
difference condition which uses, can completely manifest the above these
advantage. therefore, the workshop should achieve: ??the survey, appraises
the workshop the usual workshop precision; ??only accepts the general common
difference to be equal to or to be bigger than the usual workshop precision
the pattern; ??the sample survey guaranteed the workshop the usual workshop
precision is not reduced. The A5 components function permission common
difference frequently is bigger than the general common difference,
therefore when work piece any essential factor surpasses (accidentally
surpasses) the general common difference the components function usually not
to be able to harm. Only has when the components function receives the harm,
surpasses the general common difference the work piece to be able to refuse
to accept.

 

Well, um, thanks. Makes you hope there's no dispute over where the
hole is located. I saved a copy in WORD and will give it to QC if they
dare question any dimensions - then I'll leave early.

regards, Diego

 

Id say it looks like your scheduled 3 month vacation starts tomorrow
doesn't it.