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Thanks guys. I'm looking for a compression spring type device. I knew about the tape-like constant force springs, but it wouldn't work in my application.

Thanks Mike, that is a good solution. It would work actually. Currently on some of the smaller length tubes, we are close to bottoming the spring, giving the higher forces. I have a feeling though that it probably won't change from our current design. I just wanted to see if there was a...

The function would be a constant force of .4 to .5 lbs with any type of device pushing out. It would basically be the Airpot device with a spring inside the cylinder instead of the graphite plug. It has the capability of moving in and out at around 600000 cycles of approx .25 to .5 inches of...

That looks great, except it is dampening, where I need a constant spring force pushing out. Very similar design though.

The problem is this is a very small scale. Without going into exactly what it is, the spring housing diameter is around .1" and the forces are really low as well. I would like a constant .4 to .5 lbs, but I really don't think this is possible. The other idea I had was to come up with a...

Besides a Nickel Titanium spring (which is not accurate in saying constant force vs displacement), are there any combinations of springs or designs of springs that would equate to a constant force vs displacement. I was thinking conical spring but I'm not sure this is what I'm looking for. I...

nevermind...figured it out.

Ok here's the deal...I may be the only one that does this kind of thing...but anyway...I imported a DXF file (from my customer), I believe from Inventor, into a Wildfire part. It comes up great and even has surfaces that looks like exactly what I'm supposed to get (a 3D Airbus jet)...however I...

schafer - I totally agree, luckily (unfortunately) the idiots here aren't brave enough to do it in public, they'll go around everyones backs

I'm also thinking about it. But my company pays for it, but I don't want to be in the Black Belt Group (have to serve some time if they pay)

I have 11 holidays, but I'm on a 9/80 work week too (work 9 hrs a day for 4 days a week, 8 hrs every other friday,get the other friday off). So I usually get those Fridays off, which makes for long 4 day weekends.

politics, management, lies However I will have my MBA in a few months and can join the ranks of idiots

API 6A should include the NPT...I believe it is 10,000 psi to 1/2" NPT and 5,000 psi for up to 2"..check spec

I was using SolidWorks for about 1 year after learning it in about 2 weeks. I've had some time with Inventor, SolidWorks is much easier to learn and use. As well as is a much more Windows based program, which why maybe its more intuitive. I've started to use Pro-E on very simple part lately...

Yes, I also found the AWHEM API 6A proposed spec. One of our (my company's) engineering managers was actually on the board. However, we have decided to use the 1/2" NPT and just use an air hose to blow all the remaining testing fluid out through another NPT port. Thanks for your help.

Yah I knew about Autoclave, I was trying to stay away from them due to price, this is a cheap fixture, 36" dia flange

No its part of the Test Equipment. It sees a direct pressure of 7500 psi

I need a larger NPT hole than 1/2" for a 7500 psi. We have been testing at 4500 psi with a 2" NPT (fill with water). But now we are testing at 7500 psi. I know API says 1/2 NPT for 10,000 psi, but is there any other spec I can use for a larger NPT at 7500 psi???