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I was thinking of using this product from onlinemetals.com: http://www.onlinemetals.com/merchant.cfm?pid=1558&step=4&showunits=inches&id=84&top_cat=79 1" OD, 0.065" wall, 0.870 ID. As for the concept of drawing over a mandrel, seems as though, if necessary to do, shouldn't be all that hard if...

Racookpe1978, That is an excellent idea. When I mentioned swaging up above, I was thinking of round ball bearings or something similar. Your concept of a cylindrical mandrel seems very reasonable. And it seems like it would also be self-straightening. Bonus! Thanks, Tom

Berkshire, I do like the idea of the bike pump, if for no other reason than I can likely salvage pistons and valving. However, for cosmetic appearance reasons, a brass cylinder would be a home run with the client. It's intended to be an heirloom piece and having a "Made in China"...

Thanks, Cockroach--I like the idea of the surgical tubing to minimize harmonic vibes. Nice. Btrueblood, can you elaborate a little more on the low pressure air cylinders you made? The whole reason I need the cylinders is to fabricate some air damping cylinders. I'm limited to max 1" OD for...

All, How would you suggest fabricating brass cylinders that are very close to true round? Would likely be starting with brass extruded tube, 1" OD with wall thickness of about 0.070". Finished length approximately 8". Smooth enough to contain compressed air well enough for damping purposes...

Having recently completed my first 3-axis CNC router, go with the ACME lead screws. They're not that expensive to buy in lengths up to 6', and there are multiple sources of supply for adapters between your input shafts and the lead screw, whether of the single-start or multi-start variety. Note...

All, I appreciate the great ideas! However, since it is a free-standing piece of furniture, I and my client would both prefer to have no electrical power input required to operate the mechanism. Call us traditionalists, but the bellows concept sounds more appealing for this application than...

And another screen shot showing the latch release mechanism layout. Essentially four posts passing through latch release bars which are activated by a decorative medallion on the front face of the piece. The design of the medallions hides the fact that the center portion is movable to release...

Sorry, missed the button to attach the screenshot in the last post. Hopefully this one will work as intended. Thanks, Tom http://files.engineering.com/getfile.aspx?folder=565af4c5-d98e-4de1-8eb6-358bd8aaa1be&file=Spring_Lift_Concept.png

Thanks, Greg. Good point on the spec details, which may help center responses on better solutions to my problem. Long story short, it's a one-off mechanism that is part of a piece of high end custom furniture. The piece is an upright dresser. The customer desires a hidden compartment above...

All, Need some ideas for controlling the speed at which an assembly which is being lifted by springs against gravity can travel upward. In general terms, the assembly being lifted weighs 50-75 lbf while being pulled upward by spring tension exerting approximately 111 lbf at the beginning of...

Thanks, Ted. I've searched Airpot's online catalog but haven't found one with the travel I need in a small diameter package. If I could find one off the shelf I'd definitely consider using so long as the price weren't more than the cost of the materials to make my own. This was a late add to...

All, First post after searching your excellent archives but coming up short. I would like to fabricate a small diameter (1" OD max) air dashpot/damper/(dampener?) cylinder. It is to be incorporated into a piece of furniture to control the speed at which a hidden compartment opens and avoid...