If its less than Rc40 just go slow and use plenty of thread cutting lube. If an adjustable die you might want to back if off and run several passes to reduce depth of cut.
Re the 5 pylon 747 there was a 4 engine B-17 WW2 bomber converted to use a 5th engine for testing purposes by P&W in late 40’s for turboprops. All 4 recips would be shut down with the turboprop maintaining flight power. I saw the airframe at the Bradley museum in Windsor Locks early 70’s sans...
Another interesting story, and it isn't always the bean counters!
I worked a few years at a small commercial machinery equipment manufacturing plant, that generally had a pretty good reputation. Once during a lull period in sales an unexpected OEM RFQ came in for some assemblies needed quickly...
If the side opposite your thin wall is helium, can it be at a very low pressure to minimize the pressure drop across it? This reduces the structural load by what ever you can live with for the helium pressure.
Excellent answers, that makes perfect sense now. Barbero does mention in several places that there is an assumed perfect bond between the two materials and this is one of them. Thanks Brian and moon.
I am doing a similar task as WK95 is, learning to design with composites by hand and have a related question that I think warranted its own posting. I'm using Barbero's book and am in micromechanics having just read the thermal expansion section-you calculate the CTE properties of the laminate...
Good morning all,
I have been focusing only on the first (lowest) frequency and calculate stress and deflection results based on that value as Steinberg indicates that this is where the highest deflection takes place. Why is this the case? If I wanted to calculate the results for higher modes...
Thank you for the comments-2219 really looks good as does 2124 for hot, but availability is something else. Alcoa no quoted as they have a 7000 lb min order but they did refer me to a distributer who might have something. Parts need at least 5" diameter bar or plate and that is not too...
Hello,
I have an application that will have short term (~1hr) exposure to a hot environment which may be as high as 300-325 F. In looking at what I have used before for similar items (7075-T7351, tho only to 275 F) and possible alternates I came across 2024-T8 which (using mil-hdbk-5 data)...
We are in the US. There are 2 sections; one is approximately 14 cubic feet and 125 psig, the other is approx 4 cubic feet and is under vacuum internally. Even tho there is no plan to sell commercially, I want to use the code rules but am running into resistance hence my question as to what is...
Hi,
This is a new area for me and I have a really basic question on the pressure vessel code. Under what conditions does it apply? For instance, an R&D project needs an unfired pressure vessel. Can we design this ourselves without it being certified as long as we follow the code requirements...
Hi,
I am working on a home project that puts a small LCD display on the dash of the car. I'm using a plain rectangular plastic enclosure for the display at the moment but am looking for something that looks a little better, maybe triangular in shape, roughly 5" long, 3" vertical and about that...
Hi,
Does anyone know of a source a CAD model (stp or igs would be fine) of the Ford Kent 1600 engine? I need only the external configuration for designing an installation. I can get access to the real thing but it is several hundred miles away so thought I'd try this first.
Thanks,
Bob
