Thanks for your videos. You are doing a fantastic job! This channel is the highest level of sharing GD&T knowledge. Masterpiece! Regards from Poland ; )
I appreciate every video you put out. It is clear you work hard to become a subject matter expert not only at gd&t, but also Zeiss Calypso programming and many other things. Thank you for sharing your knowledge. You are much appreciated!
Thanks so much! It means a lot to me that you take the time to post a positive comment. I’m thrilled my content is useful for a working professional like yourself.
GD&T by Bruce A. Wilson has a definition of DATUM and DATUM FEATURE. Can you make another video to explain the difference between DATUM and DATUM FEATURE?
I have question about the feature control frame on the bolt circle at the very end of the video. what would it imply if you used ABD instead of ADB? Thanks for the great videos !
As usual, Dean videos' are very pragmatic and useful. I really love to watch how Dean explain every sibgle detail of GD&T. One question for this Datun topic: How to interpret tha Datun B and C if both of them are a FOS holes? I saw this isbquite common in other videos but not sure how each axis of hole B and C constraint the DOF. Hope you can explaine this and best make a video on this. Thabk You very much.
Hi, thanks so much for the feedback. I am working on a video to address your question. I want to be thorough, so it is taking longer to write up than I thought.
I have a question, the 2.250 bolt circle, how would a bench inspector measure that? I can measure it no problem on my CMM but how can I confirm my numbers on the plate? Really like your videos. Thanks
Great question. Let me make a video about bolt circle Inspection. On the plate, I would use a gage pin in the center hole to establish a “zero” for the height gage and then measure all the holes from there. I would use a combination of CAD and excel to convert the angular dimensions to coordinate, since the tolerance zones are diameters, it means the same thing as far as Inspection goes.
I'm a little confused by the dimension at the top: [⌖|Ø .007|A|DⓂ|B]. Perhaps I don't understand Ⓜ. Isn't this maximum material boundary? So the part can float in D? That is, you would need three points of contact with |A|, you can translate the part in |DⓂ| until you get it where you want, and then you have to have 1 point of contact with |B|. Maybe this is what you were saying but it went over my head.
Hi, you have the right idea. 3 points minimum to “A”, “D” is set to the virtual condition of the feature identified as “D”, and datum “B” is just for locking rotation so that the hole pattern “looks like the drawing”. In this case, datum “B” would need two points of contact to stop rotation of the hole pattern to the square shaped part.
Hey Dean! I love your videos and I have some questions regarding the datum B... 1. datum B lock the rotation of the part using 2 points of contact in this case, how datum B can be simulated in this example? A Block or pins? 2. Datum B is fixed in distance from datum B or is it movable? 3. The allowed Shift tolerance to datum D would apply in any direction regardless the datum B constrain? Thanks in avance, regards from Mexico!
