Belanger, the main problem is my knowledge of GD&T
I have several books on the topic, Al and Scott Neumann gd&t book and course and Alex K’s book.
I find it terribly difficult to learn GD&T from a book/ video, and find it slow going.
My next approach is going to be a course and a community...
3DDave , thanks. I corrected the sketch. I also took a look through the ASME Y14 standard but did not see anything on using ,multiple cylindrical datum features for perpendicularity , like what is done with run out.
Hi,
I have a bores that has two features that serve as stops for the items that are press fit.
There is a perpendicularity call out to datums A-B
Is this simply stating that both of these features must be perpendicular to 0.15 to both datums A and B?
Also will the tolerance zone for both...
I really just wanted an example(textbook, website or other resources)for performing a stack up for worst case run out. Getting into these details is too difficult with being able to post the actual print.
Thanks GregLocock.
There is a circular run out tolerance call out, of 0.02mm on the face where the dial indicator is shown. I know that bore position tolerance , perpendicularity and other will affect the wobble of this face, but not sure how to compute the stack up. Seems like it would...
I am looking for an example of how to perform a tolerance stack up to check the worst case circular lateral run out.
I am only finding basic 1D stack examples , or 2D gap analysis type problems. Hoping someone could point me to a few good resources.
I have paged through Bryan R. FISCHER...
I took the run out tolerance of the inner race and outer race and summed them to get 0.070. I.e, Inner race r/o tolerance 0.035 , and outer race 0.035.
I am looking for the runout on the surface of the hub, and how both bearings run out contributes to it.
Let's come back to the lateral run out. First I would like to see if I have the right idea for the radial stack.
Would radial run out stack simply be bearing circular radial tolerance + the hub radial tolerance ( 0.070+0.075) = 0.145
This is for a wheel bearing. I am trying to find the radial stack up of the inner and outer bearing and the hub.
Circular Run Out
Inner bearing = 0.070
Outer bearing = 0.070
Hub = 0.075
The datums A-B are the bores.
Could I also find the lateral runout from these tolerances ?
I have a roller bearing, the cup and cone have a circular runout tolerance. The hub that the shaft and bearing are inserted also have a circular run out tolerance.
I am a trying to understand if the cup and cone tolerances will add/stack up and affect the hub run out?
I've noticed that 2D prints from Germany (one that I have seen) do not have GD&T , is this common ?
The print calls out this ISO 1101 spec, which is GD&T. Just not sure why symbols not shown on drawing.
ISO 1101
Geometrical product specifications (GPS) — Geometrical tolerancing —...
I have a rod/ shaft with a hall sensor that senses a magnet. I purchased a general bearing from Granger, mini ball Brg 626 6mm Bory Alloy Stl Item # 49DD56.
The bearing seems to have excessive radial or tilt angle as shown in the image.
The problem is the hall sensor is measuring the...
Found a good book titled MECHANICAL TOLERANCE
STACKUP AND ANALYSIS by Fischer with a good description of 1, 2 and 3D stack up approach.
"As all tolerance analyses and stackups are truly three-dimensional, the problem
solver is forced to frame the problem in such a manner as to facilitate a...
I’m almost always asked if I can perform a tolerance stack up analysis, and the answer is yes, a basic linear 1D, stack up.
I have yet to see a 2D, 3D or a radial stack up calculation. Is it just a case of these being more complicated and difficult so designers rely on the 1D stack up making...
