Hi pperlich,
Without meaning to sound rude, I appreciate all responses, but why do you doubt that is the correct formula to use? It is Barlows formula for calculating the internal pressure that a pipe can withstand. It was also mentioned in the link that keyen provided.
I am gaining extra...
Hi Guys,
Thanks for the concern. I have uploaded another picture with both parts highlighted different colors, the top part is showing the current set up, the bottom the proposed set up.
The grey part in the top picture is made from 4140 Chrome Molybdeen steel and the main body has a wall...
Hi Guys,
Im in the process of adapting the pressure vessel on my air rifle to increase capacity.
Please take a look at the image attached, is it acceptable for a pressure vessel to step down in size from 23.5mm to 20mm, and then back up again to 23.5mm? The step down in size is where 2 halves...
Hi guys,
Im trying to put an m14 x 0.5mm thread on an aluminium bar. I originally purchased a dye from china, used it and i found that it cut the major dameter of the thread to 13.5mm instead of 14mm.
Thinking it was a faulty dye i got my money back and ordered another, this time from germany...
The valve is using straight threads.
I have just been looking into what dave said about the first 3 threads taking all the load, I have found this site http://www.gizmology.net/nutsbolts.htm which says that it is the first 6 threads that take the entire load, with 2 extra threads as the first 2...
Just gone through the calcs again:
Force = pressure * area
Force = 3625psi * 0.699
Force = 2533.875
Shear area = force / yield strength
Shear area = 2533.875 / 19600psi
Shear area = 0.129
*5 safety factor = 0.645
Engagement = Shear Area / pitch circumference
Engagement = 0.645 / 0.956...
What a dohnut regarding the formula, sorry I was at work at the time and rushing it quickly, will try it again a bit later.
racookpe the pressure cylinder is off of my air rifle, im designing a new valve & regulator to free up space inside the cylinder as well as increase the fill pressure from...
Just gone over my pullout calcs again as i got the diameter wrong:
Calculate pullout force:
Pullout force = (pi * shear dia * length) * shear strength
Pullout force = (3.1415 * 24mm * 10mm) * shear strength
Pullout force = (3.1415 * 0.944" * 0.393") * 34100 psi
Pullout force = (1.165) * 34100...
Hi dave
Thanks for the formula however I don’t seem to have got the answer I was looking for. I got an engagement length of 1.762 inches, the current fitting that came from the manufacturer only has an engagement length of 0.393 inches. The material being used for the fill valve is brass...
Evening all,
I am in the process of designing a fill valve and regulator that screw into either end of a cylinder that holds 250 bar of pressure. The thread at both ends of the cylinder is M25 x 1mm.
Does anybody have any idea how I would calculate the length of thread needed so the...
Hi guys,
I hope this is the correct place to put this.
Been in engineering a fair few years however never really dealt with pressure so please bear with me.
I am trying to put something together that can turn a screw at the bottom of a pressurised cylinder.
I thought of a rod with a handle...
Hi everyone,
Sorry i havent replied, my comp has been playin up, had to access the internet through my phone.
Thanks for all the usefull suggestions. Im going to be using the fairings for my track bike, when i came off it last the abs fairings broke into a million pieces anyway.
I was going to...
Hi everyone,
Im going to have a bash at creating my own carbon fiber motorcycle fairings. My original fairings are made from 2mm thick abs plastic. I was just wondering what people thoughts were as to how thick I should make the carbon fiber to give it the same strength as the original...
