![]() ![]() Ship it Paco.ĭo any of your customers have a Manufacturing Standard? RE: thread depth measurment ajack1 (Automotive) 29 Aug 06 14:21 Get an extra turn on that gage and she'll fly. Unless otherwise specified, the length of external threads and the depth of internal threads indicated by untoleranced dimensions is to be considered MINIMUM.ĭoesn't get any clearer. The length of thread dimensioned on the drawing shall be occupied by fully formed threads. Here it is straight out of Large Unamed Aerospace OEM Design Manufacturing Standard. I don't have the ANSI on dwg interpretation within arms reach, but the source inspector here says the default is Minimum Depth. The other type specifies minimum and maximum values for depth of the thread and requires 2 depth limit steps on the gage. One type specifies MINIMUM DEPTH ONLY and therefore requires only one depth limit on the gage. It starts out talking about depth limit steps on gages and states "There are 2 types of specifications refering to the depths of internal threads. Section 5.6 GAGING FUNCTIONAL DEPTH LIMITS OF PRODUCT INTERNAL THREADS. There's a standard gaging practice section that in my 1969 version starts on page 6.0. Here, open up good 'ole Handbook H28, the Federal Spec for screw threads. RE: thread depth measurment ajack1 (Automotive) 29 Aug 06 02:40 And if you're trying to get a customer to issue ECN's on every drawing Joe Blow in engineering pegged to +/-.005 since he started with the company in 1975, Good Luck! I agree, by all means, kick it up the food chain, but if this is an old job that somebody else made without a problem for the last 10 years you're gonna look as dumb as a pole trying to explain why YOU can't hold tolerance. Besides, just because you have a stupid callout doesn't mean you have to be as dumb as the screw that goes in the hole. So right about now, the inspector is guessing the parts are bad and he's wrong.according to spec. Everything I've seen calls it a "minimum" length of engagement. The point I was trying to make before is that according to The Book, the standard 3 place decimal tolerance on the drawing does not apply to the maximum depth of the thread in the same way the major diameter of a. Well, no, its not the inspector's job to "guess", it's the inspector's job to "know". RE: thread depth measurment hedonite (Mechanical) 28 Aug 06 15:43 If he can't answer the question, he has to back off and accept the ground gage method. By this time he should be bleeding from the ears. ASK THE INSPECTOR TO TELL YOU WHAT THE ACTUAL TOLERANCE ON ***THIS*** THREAD IS (pointing at one he doesn't like. ![]() REALITY, one must take into consideration variations from MMC and the pitch tolerance of the thread. when the thread and drilled hole are at their smallest and the pitch at its tightest. The spec says that the depth of engagement callout applies to the MAXIMUM MATERIAL CONDITION.i.e. In other words, grind a gage to depth, if the thread is fully engaged, it is good. 005 because they'll buy one for everything.and REJECT GOOD PARTS!!!!ĪNSI/ASME B1.2 (get a copy of ASME B1.1) recommends that the length of the go gage should approximate the length of engagement. You'll be beating your head against a brick wall for the rest of your life trying to machine every single thread in the shop to +/. They work too good and they don't apply to a standard callout. a0106201Description01: Starrett Dial Depth Gages are available in either a 6" or 12" (150mm or 300mm) range and are a quick and accurate method of measuring depth of holes, slots and recesses.… a010710ProductPhoto01FileName: 640JZe52708cUSz1 a010750UsePlaceholderPhoto: N a010770ApplicationPhoto01FileN: 110402_Dial_Depth_Gages a010110SeriesTitle: Depth Gages a010120ProductTitle: Dial Depth Gages a010170Brand: Starrett a0101201Description01: Mechanical or electronic? We let you decide.Good Gawd I hate standard tolerances.that and Mech Guys who never browsed a Machinery Handbook or a supply catalog. Large openings can be measured using a 7" or 12" extension base. directly from the rack and the dial indicator. itemid: 1121524 -listprice: 0 -promoprice: -1 -uom: Ea -webprice: -1 -webstatus: UNPUBLISHED a0105101Title: Dial Depth Gages a0105201Description01: Starrett Dial Depth Gages are available in either a 6" or 12" (150mm or 300mm) range and are a quick and accurate method of measuring depth of holes, slots and recesses.
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