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  • Users: Ductmate
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  1. Ductmate

    converting a .ipj file to .dwg

    We have some old files that were done in Inventor and are saved in .ipj format. Nobody has inventor on their machine any more, so we need to get these files into .dwg format or something we can work with. Does anyone have any ideas on how to go about doing that? I've never worked with CAD...
  2. Ductmate

    Making prototype zinc castings

    I want to make some prototype parts in the lab using zinc. What I'd like to do is take my existing part, cast it into some kind of media and be able to pour molten zinc into it. I know this is a VERY rudimentary set-up, but I don't really have the means (or expense) to machine a die to cast...
  3. Ductmate

    Efficient finishing/cleaning method for DOM tubing

    I have a product that is made of 1 7/8" x 4" DOM carbon steel tubing with a machined bushing welded into one end. It has 3 8-32 threaded holes in it. I am looking for a way to efficiently remove the mill coating and paint from the DOM steel so that I can apply a phosphate (parkerized) finish...
  4. Ductmate

    Rockford Ram Hardness Tester

    We have a Rockford Ram Hardness tester in our shop, model 30-R. The rollformer line operators use it to check the hardness of our steel (mostly galvanized). It's never been calibrated to my knowledge but the operators know what the usable range is. Someone lost the ball out of the indenter...
  5. Ductmate

    Coating test for Galvanneal

    I need a test that my warehouse people can do in the plant to distinguish between galvanized and galvanneal. We use copper sulfate to identify zinc coatings, but it doesn't tell between galvanized and galvanneal very well. Is there another way to test for galvanneal that can be done on the...
  6. Ductmate

    Respirators vs. dust collector

    In our water-based sealant production, 50lb bags of Talc are added to our mixer. We currently have a dust collector ducted into the lid of the mixer. When the bags are emptied into the mixer, the mix tank is under slight negative pressure, so any dust is sucked into the tank. We also have a...
  7. Ductmate

    compressed air flow calculation

    I'm looking for an equation to figure what the flow rate of compressed air (in CFM) would be through a seamless tube of diameter 0.180", 24" long, at 100psi. One end is open to the atmosphere. I looked through my old engineering books, but it's been a long time since I've done flow stuff...
  8. Ductmate

    zinc castings in pool area?

    I have a zinc die cast product made of alloy #7. If this was used in an indoor swimming pool area, would the chlorine have any detrimental effect on the zinc. Thanks, Vince
  9. Ductmate

    casting iron with thermite

    I'm working on a project that involves making a casting of a prototype of a beam clamp. I have some machinable casting material, but that won't make a prototype I can test. I don't have access to a forge or foundry, but I can make Thermite. Does anyone have any techniques or ideas on how I...
  10. Ductmate

    looking for BS 476 part 20

    I've been searching the net most of this morning looking for someplace where i can download or purchase BS 476, part 20, Method for determination of the fire resistance of elements of construction (general principles. Can anyone tell me where to find it, or at least give me the general gist of...
  11. Ductmate

    Metal Embrittlement in galvanized bolts

    We use 1/4"-20 Grade 5 galvanized bolts in one of our products. I don't know if they're electroplated or hot-dipped. Recently we've had problems with the heads breaking off during installation. When I do a pull test on them, (at 2"/min) they are breaking around 2500-2800lbs -...

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