Great video! So glad someone took the time to explain this in a friendly visual way!

This is excellent. For anybody interested the diameter of the red circle = numerical value of the given variation(straightness, perpendicularity, true position) at MMC from the little GD&T box symbol that applies to that feature.

I cannot, for the life of me, understand how anyone in their right mind would "dislike" this video.

Thanks a lot. It was really helpful.

Thxxxx

Thxxxc

Please explain how making the virtual condition circle larger prevents bad parts from reaching the customer. Your pegs can now be bigger (because your gauge holes are larger)

There's another issue: repeatedly using the gauge will lead to the same situation as with the peg.

This video always shows up instead of my channel

Quint, Your idea of borrowing a part from another machining cell to functionally gage your machined part works in *In House* machining operations. But.... in today's industries part pieces are outsourced to multiple countries acrossed Language and Cultural Barriers. Meanwhile Corporations like Sandvik,Kennametal,Iscar, and most Machining Center Mfg'ers still push for reduced cycle and manufacturing times. So where are the Humans that can keep up with Functional Gaging at the Machining Centers? (non-Existent?) I have 1st hand experience that the actual Task of Functional Gaging is being laid on the shoulders of the Finished Product Assemblers. A 50% success rate of Assembly *By Verified Assembly Processes* makes me frustrated. Especially when units that are 90% complete must be dis-assembled to change the units component part pieces. Not to mention what that does to be able to keep up with a daily production schedule. A One in Twenty part piece Functional Gage Check is not enough to ensure proper fitment of component part pieces. Daily 1st piece checks and Daily In Process Checks along with O.Q.R. Reports on a one to one basis should be implemented to insure proper quality. But Alass try getting message that acrossed the Language, Cultural and Managerial overlay of any International Corporation. Maybe one day (The Powers That Be)

@Witty..UserName

3 жыл бұрын

Agree & Disagree. GD&T is the language of engineering & manufacturing that crosses verbal language & cultural boundaries. 1st hand experience... I am an inspector turned QE (trainee still). We have a greater than 99% success rate on our verified assy process (medical). We use parts machined in house & from vendors with 100% inspection on critical features on some of our final assemblies. That is with inspections of AQL 1.0 on most of our components before assy. For example we will inspect 13 pcs of each lot of 100 components or 20 pcs of each lot of 200 & get 99+% success rate at final after assy. Shipping an average of 100 pieces a day of one particular assy - it's been over a year since it has had a functional failure at final inspection for the assy... again using AQL 1.0 for components. We use a mix of attribute (functional gauges - or pass/fail) & variable inspection. We use everything from calipers to CMMS & work with tolerance as tight as ±.00025 in (250 millionths). where parts are normalized in a controlled environment before inspection. Of course we have tolerances in the ±.020 range as well. As an inspector I made it a point to show new machinists what they were making & why. How it was used, how it works with mating parts & why they should care. I started doing that & component level acceptance increased & things like burrs & cosmetic defects dropped. At the machine, the operators catch a majority of errors before inspection as well. Some operations have 40-50 features to inspect... by the operator. Mostly manually & often times involving math. Such as the formula for position. Literally finding deviation on a height gauge & using the position formula to record the actual position of said feature. People make it happen at the end. They can only be as good as the process though. & I agree - every operator should learn to assemble. Every assembler should learn to operate. Everyone should have a few days in everyone else's shoes... from operation to document control to engineering to inspection to wash & passivation.

why no math?

@Witty..UserName

3 жыл бұрын

Brain pain mostly