Can all of the heads in the ASME B18.6.3 be used interchangeably for the same loading requirements? Providing identical material properties and identical thread specification?
Frank
Is it legal to use a ,say, MMC modifier in the upper portion of a composite tolerance and a RFS in the lower section of the TOLERANCE section. I know the Datum modifiers can not change per ASME. What say you all, or is there a statement in the standards on it?
Thanks,
Frank
I have been discussing this issue with my colleges and there seems to be a diversity of opinion. Does anyone have the formal SolidWorks position on this, or know and can share.
Does using large family table of parts (fasteners) require more resources because the tables may be large or is it...
Is The CAGE Code (DAI) column really still required on modern engineering assembly drawing parts lists?
Commercial world and/or Military, most of the books and standards I have say it is a mandatory column in a parts list. My people are talking about eliminating it as we now mostly commercial...
My company still references DOD-STD-100 in many documents, I am updating one now. Are there any "gotchas" in just replacing with ASME Y14.100? IHS says this is very old, DOD was replaced with MIL and then ASME. I know the paragraph numbers will be different, any other issues?
Thanks,
Frank
In my machine tool days, I was taught that you designed a gear train with the pitch circles touching. The place I am at now wants to leave a .002 gap between pitch circles. I believe the proper offset is built into the actual gear tooth design. Grade 8 gears used in aerospace butterfly valve...
My shop has asked why we are not using tangless inserts for our designs. I said, "I thought they were the ones that would be most opposed to the idea", After looking at it, I do not see and downside, anyone know of one?
Thanks,
Frank
I just got a copy of Alex K's book on the ISO and in each of the orientation tolerances (when referenced MMR for features of size): "(tolerance)applies to the orientation and spacing of the group".
Is this where this originally got started or was it in the actual ISO standard somewhere? I...
I was discussing the simultaneous requirement with someone and looked again at the section on it and realized I was expecting it to be applied among patterns that essentially included a pattern of one hole. Can a single hole be a pattern or more importantly do identical frameworks keep the...
I am trying to understand the difference between an aerospace fitting AS4735 style like AS931 and a Parker ferruleloc style fitting also 27 deg flareless. It seems to be a closely guarded secret, anyone?
Do any of you use the B18 Fastener Part Identifying Number system for standard fasteners (based on ASME B18.24)? Do vendors know this system? Do you just use the number or do you prefece it by saying "B18 fastener number: bla, bla bla"?
Frank
I believe it has been discussed before here:
Can a profile tolerance be refined with an inch/inch type specification? or a sqin per sqin specification?
Like straightness or flatness does.
I need a hex nut for temeratures over 1000 degf. NASM21043 is for ranges up to 800 degf, are there any standards for hex nut over 100 degf, say inconel or other materials?
I believe I had been told once by a senior engineer that for a bolted joint to stay properly torqued the mating surfaces should have a surface finish of at least 125, we were having lots of "bolts shaking loose" problems and only required 250. Is there a reference for this?
Frank
This is the spherical part I have discussed here before in past posts. I was unsure of the concept of a spherical zone to a plane, The inspection people were dead set against it. So I asked here.
I finally have a picture I can post.
I am interested in opinions on the approach to this part and...
I am interested in the your impressions/experience with the bearing manufactures recommend bearing seat machining tolerances like the ones from SKF referenced in the in this thread;
thread821-300114
Approximately midway in the thread is a link to an SKF chart of recommended bearing mounting...
I have a current in-place design that uses a pin and mating machined slot on the bearing OD to prevent rotation. From the historical record it appears to be this feature was added as an after thought.
My questions are:
Are proper bearing fits, tolerances and finishes sufficient to control...
The whole idea of using orientation to control location has also come up in my past work as the “GD&T guy”. A very well respected senior inspector proposed the use of parallelism to control the location of shaft keyways. His idea was that you would line up the shaft diameter (the primary datum)...
I want to position a sphere to a plane surface. The surface for the plane is established and referenced as the datum. I am positioning a spherical feature to this plane. Is the correct tolerance zone to reference in the position callout a sphere, cylindrical, or none? The tolerance control...
