Design will use Stainless Steel Helical Inserts paired with SHCS. If Stainless Steel SHCS were specified, there would need to be some Moly Lube, etc to lubricate the stainless on stainless pair which would be an issue... BUT... Design cannot use lube. How about a Steel Alloy cap screw...
Can anyone point me to a chapter and verse in any dwg standard (prefereably ASME 14.5) that provides guidance on avoiding redundany in standard dwg practice? i.e. FNs on an assy dwg... If used more than once, the redundancy is noted as a "reference" and this is in the case that it IS needed...
I've downloaded and done word searches within ASME 14.1, etc... Need to answer the following questions... If you can, please give a reference on where I might find the wording to back up the convention?
1) Assembly drawings - how are multiple instances of a FN noted? 2X, 3X, etc or 2 PL, 3...
Problem: Cylinder about .75" thick has a "humidity indicator" with a 1.0" dia male thread going into the cylinder... The designers of the humidity indicator claim that it is made to a perp of +/- 1 deg perpendiculariy to its own central axis but that it "deforms" when torqued into place such...
Why does solution 2 not do what I need it to do???
It gives a true position tolerance to each hole of .005" with respect to datums. I guess if you are saying that I'm holding the first hole "too tight", I could agree... But, in practice, the machinist is just going to set up the part and...
Hmmm.... I did not find a way to EDIT my post so I'll attach the new attachment (with a new filename) here.http://files.engineering.com/getfile.aspx?folder=2eedf9ea-a9e7-4687-90d9-249d647a1e7b&file=PlateGDT.pptx
Reference attached. This is what I’d believe to be a basic question, but I’ve not found any clear, cohesive answer that points back to ASME 14.5. Though I did find a reference to “dimensioning all features off a datum”, but I can’t find that post now.
See Scheme 1 of attached. Nothing crazy...
I am surprised there is no welding subthread here in the mechanical area... At least not one that I saw..
Issue: .090" thick 6061-T6 Welded Enclosure popped a butt weld seam during either a manufacturing vibe checkout or a low temperature ice test. Assumption is that it was the low temp...
Was in a hurry... Internal thread is NPTF. The External Thread on the hex socket flush plug is NPT. Assumption is this will work...
Sounds like I'll get sealing interference on the crest of the NPT plug bottoming out on the flat of the NPTF internal thread root...
And that I'll have a seal...
Did not see a way to edit post so let me clarify above...
External thread is NPTF (dryseal). Male thread going into that external thread is NPT (standard). Loctite PST thread sealant will be used.
Assumption is the above plan is acceptable?
What about NPT vs NPTF vs NPT dryseal.
My understanding is that NPTF and NPT dryseal are the same thread. They have a deeper "V" on the thread vs a standard NPT which is more blunt.
Yes?
If so, I'd assume an external NPTF (or dryseal) thread can accept a standard NPT fine?
It seems...
I'm learning. Thanks folks.
But... after reading responses, I realized I described my issue incompletely.
The thread is cut through the bottom of an alum enclosure to allow a temporary test port with NPT thread to be screwed in to run the Helium Leak test. The thread starts down in a...
New to the use of NPT. The key problem is the taper which introduces a question in the context of the design:
Threaded hole goes directly into an aluminum enclosure that has numerous parts installed, and a flat gasket at the parting line of the enclosure. The threaded holes provide the...
Thanks for response... I'd love to see proof that an aluminum thread will wear even if it's used for bolts that are tightened to their proper limits and not over-torquing
I've got an application that is being force in the direction of a helicoil insert but I'd rather not doe to size and cost...
Rules about threading into 6061-T6.
I've got a design application that due to it's closeness to the design size envelope limits, and the part's size, force threading directly into 6061-T6 for some #4-40 SHCS.
The other choice is using Helicoils, but their larger dia takes the threaded holes to...
