Hi,
I've been tasked with fixing an excessive noise issue from a 4kV transformer enclosure and looking into adding a limp wall layer to the inside of the enclosure to absorb airborn noise. The existing enclosure walls are .11" thk steel and about 6" from the transformer. The transformer is on...
Hi I have a general question aout NEMA GPO-3. Is this just a general spec. for flame retardency, track resistance etc or does 'GPO-3' specify certain materials to be used? Eg. I know it's glass/polyester but is that written into the spec or could otyher plastics be used?
I guess i'm just trying...
Hi,
Can anyone recommend a polish/technique to get a very smooth surface on a UHMW? Ideally something easily obtainable and not requiring a particular skill.
The part is a mold and I'm hoping a smoother surface will improve release of shore A 40 silicone parts. Currently the surface has...
Hi,
Can anyone recommend a polish/technique to get a very smooth surface on a UHMW? Ideally something easily obtainable and not requiring a particular skill.
The part is a mold and I'm hoping a smoother surface will improve release of shore A 40 silicone parts. Currently the surface has...
Hi,
I'm trying to analyze the attached part in AutoDesk Inventor (2008) and cant decide upon the best way to constrain it. It's a clamp that gets screwed to a surface and then applies a force towards that surface via a screw.
I'm applying a force to the red surface in the pic, but how to...
What are the advantages if any of nickel plating a cold plate?
The application I'm considering is an approx 500mm sq 6061 alu plate, 55mm thk cooled by heat pipes. Loads are 500-1000W devices, 140x150mm, 9 per side so about 3/4 of the surface is used..
I've seen (vendor) claims that nickel...
Is the amp draw of a given fan consistently proportional to the CFM being moved?
If I map amp draw vs CFM through a range of back pressures in the lab, can I then use that data to determine CFM in real-world applications by measuring amp draw? (using same fan of course)
Is this a commonly...
Hi
I'm tasked with building a fairly large (48x31x70") vacuum chamber and I'm not sure how to regulate the pressure. I've seen vac regulators that mount inline between the pump and chamber but I'd prefer a regulator that I can mount through the chamber wall, letting air in to maintain the...
Hi
I'm using a differential pressure gage to measure static pressure inside a forced air cooled enclosure. My point of measurement is quite close to the blower and I'm just using plain 4mm ID tubing from the gage.
My concern is venturi effect changing my readings - I can blow across the end of...
Hi,
If I've chosen the wrong forum please advise. My question regards forced air cooling of some heat sources in an enclosure. An illustration of system is attached and is also here.
OK..
The system pulls air in through a filter, around some heat sources, through some ports into a plenum and is...
Hi,
I'm having a fairly complex lifting cart fabbed and assembled by a local fabrication shop and so far have had 9 made. The cost is around $3k ea.
To take cost out of the design I really need to see exactly how the shop is coming up with the price and where the most money is being spent but...
