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Thanks for your reply Brian, I'm thinking that I won't use it.

Hi Folks, I'm not sure if i am posting this in the correct place so apologies if I'm not. I have recently purchased a Cybex Aton Q infant car seat as per the attached photo. It has a safety feature that I just can't quite get on board with. You are supposed to extend the telescopic rod (Or...

I was hoping to set my limit to approximately 5,000psi (which should be a very small volume in the air chamber). The air compression should be relatively slow - as fast as the oil can expand due to temperature - so the heat should dissipate before it reaches the crazy temperatures that the...

At the moment, I am calculating the volume expansion of the fluid due to temperature and then putting that in as a volume decrease in the air chamber and working out the P rise caused by that, using P1V1/T1=P2V2/T2. Then I am just assuming that the oil chamber will be at this pressure. But I...

Ah I see. The cylinder will have a constant outside temper of 121 degC in a constantly moving fluid so should dissipate some of the heat. Initial pressure will be atmospheric and temp will be ambient.

My final temperature is 121 degC. I want to ensure that the pressure in my Oil chamber builds to 5,000psi. Obviously the air chamber pressure will be the same as I have a floating piston separating the two. So using the equations for gases that you have given me, I still need to equate these to...

Ok thanks, Could anyone point me in the direction of a set of equations that would allow me to calculate what piston stroke and initial air chamber volume required to ensure that the pressure builds up to 5,000psi? This is obviously a function of initial oil volume.

Thanks for your replies. The liquid expansion is significant. If it was fully trapped, it would reach 10,000psi. I want to add enough of an air chamber so that it only reaches 5,000psi at 121 degreesC. Would P1V1/T1=P2V2/T2 be accurate enough? I was using this for the air chamber.

hi Folks, I was hoping for some help in a calculation. I have a cylinder with closed ends and a floating piston in the middle. On one side of the piston I have a fluid and on the other side I have air. I will be heating up the cylinder and I would like to calculate how far the piston would...

Yeah I understand that - but ultimately I have doubled the spring rate. If i had a single spring with a rate of 1Lb/in, for every extra 1Lb added then it would compress 1". But with the 2 spring arrangement that I have described above then it only compresses 1/2" for every extra 1Lb added.

israelkk, can you explain why the double rate is trivial please? Thanks

Hi folks, I'm sure this is a simple question but here goes. I have a plate with 2 coil springs, 1 pushing from each side of the plate. Each with a force of 5Lbs. So the plate is at equilibrium. For argumments sake, lets say each spring is identical with a spring rate of 1Lb/in. If i then add an...

Is it possible to calculate the second moment of area of a shape with autocad LT 2006?

Hi, Basically i am trying to calculate the load required to deflect the finger of a collet. Its a pipe with slots milled along its length and these fingers will deflect when the collet is inserted into another pipe. So the finger is sort of circular in cross-section. I'm finding it hard to...