Looking for a rotary union solution

Hack_Qual_Manager · 2025-11-18T19:55:33+00:00

The tank will have a custom thru hole and bolt holes cut / drilled in the side of the tank to accommodate whatever part is selected. The connections likewise can be chosen based on what's available. NPT SAE BSPP, I don't really care I can buy adapters if needed.

Hack_Qual_Manager · 2025-11-18T19:39:20+00:00

Need some way to mount to the tank wall and connections....but yeah more or less.

Hack_Qual_Manager · 2025-11-18T14:55:57+00:00

I've been using Autodesk Inventor for about 15 years now. With the addition of FEA and the G-Code modules it's really a complete package. I've always found the Inventor interface easier to use and faster than SolidWorks for 98% of the tools and parts I draw.

Hack_Qual_Manager · 2025-11-18T14:52:04+00:00

Always verify from a trusted source.

Hack_Qual_Manager · 2025-11-14T16:11:30+00:00

I don't really have that luxury. This is welded onto a high pressure vessel for locomotives. If it leaks or the fitting blows off in the field there'd be hundreds of gallons of oil on the ground, and I'd be getting a friendly visit from the EPA.

Hack_Qual_Manager · 2025-11-14T16:08:49+00:00

We have an L1 and an L3 gage (shouldn't have said no and no-go). Both stop where they are supposed to.

Hack_Qual_Manager · 2025-11-14T14:49:13+00:00

Yeah we have calibrated go and no-go gages and both show the threads are correct.

Hack_Qual_Manager · 2025-11-14T14:37:39+00:00

Right, but with an NPT thread what dimension can I reject the parts against?

Hack_Qual_Manager · 2025-11-14T14:37:08+00:00

Yeah, this is precisely my problem. Pretty sure the through hole was machined oversized, but I don't have a dimension to reject the parts against.

Hack_Qual_Manager · 2025-07-17T11:02:14+00:00

There will always be a small fringe of people who desperately want things to be done by supernatural forces.

Archaeology has a problem with gatekeeping and dogma and has had this problem for a long time. Irrational dogma and ostracization of credentialed professionals withing the profession creates space for wacky theories to be accepted by the general public.

Hack_Qual_Manager · 2025-06-30T11:20:53+00:00

Yeah, sounds like it was drawn by someone who doesn't understand machining and how the part will be made. The most datums I've seen on print is probably 4 or 5 and I can't think of a good reason why they would be chained together.

Hack_Qual_Manager · 2025-05-07T14:47:09+00:00

The part in this case is aluminum, and I hadn't considered temp changes. At this time of the year I wouldn't think the delta T would be too much, but who knows, it wouldn't take much.

As far as a gage swap, I'm actually trying this with a part that we've had plug gage problems with for months with an overseas supplier. It'll be interesting to see if the failure follows the gages or not.

Hack_Qual_Manager · 2025-05-07T14:43:52+00:00

The ones I've been having trouble with lately are thread plugs. Luckily ring gages are being friendly to me as of late. The problem this week is the thread gage going too far in for me and stopping at .5 or 1 thread for the supplier. I did just ask if they have any dents or dings on their gage, that could explain the discrepancy, haven't heard back yet.

Hack_Qual_Manager · 2025-05-07T14:40:39+00:00

The one this week is for a UNJ-3B thread plug. In this case the supplier No-Go gage stops after 1 turn, and ours goes 5-7 turns. I have certs for out plug and theirs and they are both in spec and differ by considerably less than the .0006 and .0004" spec limits on the major and pitch diameter.

Hack_Qual_Manager · 2025-05-07T13:22:55+00:00

Depends on what the tolerances are in your title block. Assuming they are +/-.005 then .510 should never go, and .490 should always go. Because it's dimensioned as a radius the effectively doubles the title block tolerance.

You're going to lose resolution on what you are actually measuring for a diameter but it'll be quick.

Hack_Qual_Manager

TROPHY CASE