I see some drawings show gd&t without basic dimensions given. There is a little block onnthe drawing, says “basic dimensions are from CAD..”
My questions/concerns:
Most the time I’ve heard “drawings are amaster” so If now you rely on CAD.
The question: are all cad software reads/shows...
I don't why. It doesn't let me attach 2 files at a time.
here is the A sketchhttps://files.engineering.com/getfile.aspx?folder=34866178-1779-4948-ab8d-6ed66447dada&file=Sketch_A.jpg
Hi,
I just make up a sketch which is similar to a drawing we got from a customer. Would anyone see which sketch would behave practical callout. sketch A or A Mod?
Thanks!
https://files.engineering.com/getfile.aspx?folder=1bb6ead2-2536-446a-b641-7fd69b9509c8&file=Sketch_A_Mod.jpg
Thank you.
"The purpose of the drawing is to control the pocket width and its 45° edge."
Actually the 45° has +.5°/0 on an original drawing.
Is the new attached file a better callout?
http://files.engineering.com/getfile.aspx?folder=3aad07fd-bde5-487b-b38e-8a52ad9a8660&file=BASICxyz.jpg
Please see an attached picture and can someone tell which one is a better callout?
The old one: How is the 45° angle line inspected?
The purpose of the drawing is to control the pocket width and its 45° edge...
Hi John,
From Fig. 7-33 on P125 (ASME Y14.5-2009), it stated "Tolerance zone equal to positional tolerance) which is ZERO for this case. Doesn't it use (M)to gain bonus here?
Thanks, Brandon
Hi All,
Please see attached picture and help me out....
1/ Will 2 Radii need to be inspected for size? If yes what is a tolerance, +/-.002?
2/ What does True Position call for
(a) Mid point of slot width and center of 2 radii?
(b) Mid point of slot width or center of 2 radii?
(c)...
To make sure all datum features are good "to use" should a flatness to be called out for |A| and a perpendicularity for |B|?http://files.engineering.com/getfile.aspx?folder=23a29920-7101-472c-a4d2-b37b774964bd&file=No_locking_datum_feature_Per.jpg
Thanks guys.
Paul, so you means it should be use BEST FIT technique to check these holes? I've not tried to use best fit on my cmm running with Mitutoyo Mcosmos.
How about another drawing attached here? The whole is not line up with any axis. Can I use one in 1st quadrant to lock then rotate...
Hi All,
I guess this is an old question but I still see drawings here and there showed NO LOCKING DATUM FEATURE.
Please see attached picture which is from ASME Y14.5-2009, page 121. The basic 8x 45deg is from vertical line to center of |B| and center of a hole.
For calculating the TP, we need to...
Thanks John (powerhound).
To my understanding, the design would go with fig 7-26 (on p122 in the 2009).
The main thing is they want each .250"hole concentric to the cbore, |C|.
Anyway, the callout is NOT right.
Thanks for all of your guys' help.
Have a great day!
We are working to ASME.
If it means the boldcircle (of 3x .250" holes) concentric to |B| then I just added a yellow boldcircle to the sketch.
But I still don't understand why concentricity while True Position is already called out? It may tight up the tolerances and could add composite tolerance...
Hi All,
I see this callout on a part I'm checking. I've not seen the way it called out for concentricity like this. Does it mean center of 3 .250"Holes (Boldcircle) concentric to |B|?
(Normally, I see concentricity of 2 circles at the same locations.)
Thanks...
Hi,
I have another question regarding Tertiary Datum Feature again.
Sometimes, I see a drawing having 2 pins. Most of drawings pointing at one(1) Pin with label |C| and other pin will have True Position...
(Please see attached drawing).
My questions are:
1/ If a design is used one(1) pin for its...
