Straightness - Drafting Standards, GD&T & Tolerance Analysis
2019年2月8日 · Straightness on a cylindrical feature I am a little confused with the following statement from Section 5 Tolerance of Form ASME Y14.5-2009 5.4.1.1. “Since the limits of size must be respected, the full straightness tolerance may not be available for opposite elements in the case of waisting or...
straightness / flatness tolerance - Drafting Standards, GD&T
2009年11月6日 · Lastly, the flatness or straightness concept would probably not be controlled automatically by Rule #1, because the part you describe is a flat rubber part. Rule #1 does not apply to "parts subject to free-state variation in the unrestrained condition." (2009 std, para. 2.7.2(b) John-Paul Belanger Certified Sr. GD&T Professional
straightness or flatness datum - Drafting Standards, GD&T
2007年7月18日 · hello - i have a leveling plate that will be made from a36 h.r.s. that is to be used to level 3 pads for a table - the plate is only 2mm thick - not machined either side - i want to hold some type of datum so that the plate can be made straight or flat - …
Flatness VS Straightness on Surface - Drafting Standards, GD&T ...
2011年5月5日 · Straightness could be controlled tighter in that direction of lay. From a functional viewpoint, perhaps where there is a sealing surface, and you're worried about fluid leaking through any valleys in a surface. John-Paul Belanger Certified Sr. GD&T Professional Geometric Learning Systems
Straightness: parallel planar line element tolerance zone …
2015年9月18日 · The controls must be applied simutaneously. The two straightness controls create "infinite" line element 2D tolerance zones that virtually create a 3D tolerance zone which the surface must line. From what I read, Axym is coming from a point how he see's to measure straightness. I would like to discuss "straightness" on the "intent" of the control.
Drafting Standards, GD&T & Tolerance Analysis - Eng-Tips
2008年3月5日 · That example is flat wrong. There are only 2 ways to override Rule #1 and that way isn't one of them. I would actually be more inclined to believe that you are actually looking at a straightness callout instead of a flatness callout. Straightness is a straight horizontal line, flatness is a parallelogram.
Straightness refinement of flatness - Drafting Standards, GD&T ...
2017年5月9日 · The big drawback with using straightness on a planar surface is that it almost cries out for a datum reference. It's supposed to apply in the direction of the view where it's given, but that implies that the part is oriented to one of the faces you're looking at. John-Paul Belanger Certified Sr. GD&T Professional Geometric Learning Systems
Help Interpreting Drawing - Drafting Standards, GD&T ... - Eng-Tips
2012年1月17日 · This would mean that straightness of derived median line of the shaft (this term is not equal to 'axis' of the shaft!) would be limited. And in this case it could stay at 0.25 because straightness of derived median line overrides Rule #1. If the print is intended to be according to ISO GD&T, then I have no remarks to the straightness callout.
Staightness of a tapered pin. - Drafting Standards, GD&T ... - Eng …
2011年5月13日 · The problem with any kind of runout in the present situation is that there is no other feature to serve as a datum; to have a surface attempt runout against itself is simply form control. But it sounds like the original question was after straightness of the center line. John-Paul Belanger Certified Sr. GD&T Professional Geometric Learning Systems
Axis Straightness vs Surface Straightness - Drafting Standards, …
2012年1月17日 · The term "axis straightness" is incorrect, even though it is in many GD&T books and even in Y14.5M-1994. In Y14.5, an axis is a perfectly straight line by definition. The standard (and many GD&T books) also refer to DML Straightness as "straightness of a feature of size" or something to that effect.