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I'm creating a 3D model of an external involute spline in SolidWorks. The model is to be used directly for manufacturing programming, as such the model needs to reflect as best possible the required geometry at mid tolerance. I've created the involute flanks with parametric equation curves...

Hi All, I'm looking at a drawing the below call-out on a hole - doesn't seem to make sense to me.. Isn't the first row redundant since you get that same control as part of the Position tolerance row anyway? Datum feature A is a face perpendicular to the hole.

Hi All, Can anyone help me interpret the drawing below. I've no idea what that second FCF row means? I'm re-drawing the part and am trying to decide if what was originally drawn is the best approach (I've added stuff in red for clarity that's on another view) I already have issues with...

Hi All, I have a part that looks like a figure of 8 with two holes, similar to a chain link. The holes need aligning with one another but i'm struggling to decide how to apply a tertiary datum to lock any rotation - see attached. I don't want the holes wandering off so the wall thickness get...

Hi all, Referring too Fig.4-11 in ASME '09 which shows the method for establishing a cylinder axis. How does that differ from establishing a datum from a cylinder surface? Thanks, Rich.

Hi all, I have a forged wheel rim where all surfaces are subsequently machined, no forged faces are left. The forging looks like a wheel, no surprise there.. Since the part is machined call over, machined faces relative to forging features are not important to me, as long as I end up with a...

Hi All, So referencing centre lines or part axis as Datum Features is not legal, no problem, I understand why. However, I see drawings that reference such centre lines or axis for linear and angular dimensions all the time (at least where I work). Can someone explain the difference? See...

Hi All, So I'm detailing a part much like the one in Fig.7-37-2009. Could someone explain how the basic dimensions would work in this case? Since each large hole and the 4 smaller ones each reference ABC, does this mean I have to have basics going back to datum for every hole? Thanks.

Hi All, I have a question regarding the use of positional tolerance on angled holes. Is the attached legit? Thanks, Rich.https://files.engineering.com/getfile.aspx?folder=b51277a7-58df-4d6e-a2bf-8dc9b3fb48da&file=Angle_of_the_Dangle..jpg

Hi All, Hoping you can help with a question. I have a part as shown in the attachment. I want to control the rotational orientation of the slots with respect to the holes in the base flange. I'm not sure of the best way to achieve this, can anyone offer some suggestions? The parts mounts via...

Hi All, Perhaps people can help me with a debate we are having at work. See picture. My colleagues are questioning what Datum A brings to the table for the positional call-out on the ∅37. They argue that referencing Datum B should suffice for controlling the concentric relationship between...

Hi All, I have a 1.625-18 UNEF Internal thread. We have changed supplier and we are now struggling to assemble the nuts onto the corresponding shaft (still same supplier). Some nuts are ok but the majority start to bind after a few turns or need excessive force to turn. The Threads are CNC...

Hi All, I have 17mm dowel with a H7/g6 fit. However the parts do not want to play ball, I can't even get the dowel started. The manufacturing engineers of the supplier tell me the hole is drilled and reamed with a 17H7 reamer and checked with a bore gauge. The dowel is ground to g6. So any...

Hi All, I have a cylinder at 270bar containing 250 litres of air at around 15Deg. I need to fill a volume of 10m^3 to a pressure of 2bar from the above. What volume of air is required from the first cylinder? And what percentage loss is that? I'm only after approximations. My initial...