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I'm not up to trying to educate our engineers. It's weird we are sent to classes for this stuff and tested annually but the enginering group is not. Anyway thanks for all the input.

I have questions all the time re basic dimensions. Our Engineers will just drop a Basic dimension on the print without any controls. When we question it we are told a. to use the main tolerance control box b. to use the tolerance on the adjacent feature or we get no answer with the 'look' that...

This drawing was produced by a young fella 2 years out of school and now being 'Mentored' by one of the older engineers (who doesn't care and will not be told about ASME standards) This young fella has also admitted to me that he doesn't know very much about GD&T which I thought was suprising...

This is a follow-up to show you what I am dealing with. Tell me if I am wrong but Item 1. 'Datum B' should be part of the upper box (concentricity). Item 2. (roundness)the callout should be, perhaps, .004 not +/-.005. Item 3.since this is a broached hole shouldn't the call-out be symmetrical...

Been a great help, now I have some quotes. On the next post I want to discuss Basic Dimensions that will be later. Thanks

My current argument with some of our older engineers is showing centerlnes as datums on their prints.I know it has been an accepted practice by some over the years even though frowned upon by some others. I have explained that under GD&T it is basically forbidden. As head of QC Mechanical I...

It's not a matter of luck mate. First of all these are precision castings and there are mating parts involved. Second we do not design the parts or produce the prints. Our job is to inspect the part to the relevant prints and report what we find. While we are not into arguing with the engineers...

So is the default call-out for draft per feature and not per side?

Obviously the draft in castings and forgings is to ease the manufacturing process as parts are removed from the dies and molds. We do not start by measuring the draft angle we measure the feature.In this case we rejected the part because the slot went out of tolerance because of the draft. We...

Thanks everyone. Standard has been ordered should receive in 2 weeks. We are dealing with a .065 wide slot in a casting. My immediate concern was the Note "Draft included in tolerances". The box tolerance is +/-.005. Since Dft. is per side we (QC) interpreted this as adding a max. of .0025 per...

Unfortunately we do not have Y14.8. We have Y14.5. To get Y14.8 I will have to put a req. in and it will end up taking 2-3 weeks. I will do that but I was looking for some guidance on draft that I could use now to solve an immediate problem.

Are there any hard rules concerning the dimensioning of draft angles on castings and forgings. We (QC) find our engineers seem to have their own rules on how to apply draft. They have a dimension that will say +dft. and one that will say -dft. They will have in the notes; Dft. angle 1 degree...

This is an ID thread. We have just used Flexbar casting compound and it looks like the corners are flat as Dougt alluded to. I just looked at it with a loop but will have to throw it up on the comparator to check the pitch Thanks guys

This is a 1.115-32-2b non-standard thread. We (QC)do not have a thread gage for this and we are inspecting a 1st article from a new source of supply. We are checking this part against the mating part (which is known to be good)and it doesn't go. Using the formula; 1 / 32 = .031 x .75 = .023...

Trying to find the ID dim. for 1.115-32 unf thread. Thanks

I am trying to make sense of the Diametral Pitch callout on the first gear. Dividing the Pitch Dia.(2.0625) by number of teeth(66) you get .031. Is this translated as a value of 31. This would make sense to the callout of 32. If that is the case perhaps in the spec for the second gear the...

I should add that the first gear spec is a compound gear hence the dual values.

I have detailed below the two gear specs I am dealing with if you see any other errors can you please explain them. Thanks 1. DIAMETRAL PITCH: 32 2. PRESSURE ANGLE = 20.0DEG 3. NUMBER OF TEETH: 32/66 4. PITCH DIAMETER: 1.000/2.0625 5. OUTSIDE DIAMETER: 1.0625/2.125 6. TOOTH DESIGN: INVOLUTE...

I am in the process of inspecting some 1st articles. I am not that familiar with gear design but the gear spec on one of the prints I have doesnt seem right.I have a pitch diameter of 2.0625 on a gear that has 72 teeth and then a diametral pitch callout of 32. I thought the diametral pitch was...

As head of QC Mechanical I only control Quality not Design Engineering and even then Engineering can overule us unless we deem it, and can prove that a particular problem would be a product liability.