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Ansi & asme y14.512/28/2022 ![]() If you get your back up and argue your way to a solution then don't expect any sympathy when you really could use some. A gentle tactful approach may get an engineering variance accepted and you paid for the work. This is where the business aspect of machine shop work comes in. Would you like it if they tacked on some extra to your home loan or credit card bill beyond the tolerance? Probably not.Īs somebody stated it does not mean they can't use the part. Sorry but this makes the most sense for the system to work. ![]() Dimensional limits, regardless of the number of decimal places, are used as if they were continued with zeros." In my ANSI Y14.5 1982 book is says under section 2.4 interpretation of units, I'm partially responsible for making several tens of thousands of parts per day that have tolerances as tight as 0.0018 mm (unilateral tolerance) -, and believe me, if they exceed that tolerance by even 0.00002 mm, the customer will know it, because they can and do check it to that accuracy. If the part comes in +0.000200004, the part does not meet the specifications of the drawing. In your example, the tolerance, because the Engineer denoted the dimension to 4 decimal places, he/she expects a +/- 0.0002 tolerance. If the Engineer specifies a dimension of 3.3424 with no tolerance, then you refer to the general border tolerances, or the specifications denoted in the border/title block. The tolerances in the border are denoted for untoleranced dimensions on the drawing, not to what level they are measured. ![]() In your example of general border tolerances, the trailing zero's mean nothing. The number of decimal places denoted on the drawing has no bearing on how accurately the feature can be measured by the customer. The reason behind this standard is gauge R & R.įor the folks out there trying measure 0.0005" tolerances with 0.0001" instruments, you really have no idea what size you are supplying, because the 0.0001" instrument isn't accurate enough to measure a 0.0005" tolerance repeatably.ĭaleroe, the upper specification was 0.000, it doesn't matter how many decimal places you carry it out, the specification still says zero. ![]() The standards also require gauge R&R testing, calibration testing, etc. The 10x is standard for any quality system I have ever been exposed to, including ISO, DIN, ANSI and JIS. ![]()
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