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  • Users: wchowe
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  1. wchowe

    Conversion problem

    Hi all, I have been trying to use a heat exchanger formula and have been unable to get it to work out in both imperial and metric numbers. This leads me to believe I have something wrong. I am trying to solve for flow, using Load, density, Specific Heat,Delta T. When I convert each units and...
  2. wchowe

    Metric Thread clearances?

    I am designing some equipment that uses some special sized metric threads (103mm). I want the two mating pieces to turn freely by hand (jam nut, adjusting nut, etc). Is there any documentation that defines which tolerance and grade to use when you want a specific outcome (like hole/pin fit...
  3. wchowe

    Composite to line Stainless Steel Box

    I have a "box", basically, that is going to be made of Stainless Steel, that has water pumped through it to cool the internal components. The requirements are it needs to sustain our operating temperature of 150-200 F without deforming, and have a dielectric strength that can handle 2,000 V. As...
  4. wchowe

    Tubing Radius Tolerances?

    Does anyone know if there are standards concerning the radius on the corners of box beams? I have a 2" square 1/4" wall beam that is coming from two different vendors with 2 different radius. Thanks Bill
  5. wchowe

    Heat Transfer and Reflectivity?

    Hi All, I have an application, with mostly aluminum parts. I have a central block that is water cooled. I have exterior parts that are bolted to the central block. I do not want to impede the heat transfer from the outside block to the inside cooling block. However, I would like to plate the...
  6. wchowe

    Heat Transfer Coefficient of coatings?

    Hi All I have an application, with mostly aluminum parts. I have a central block that is water cooled. I have exterior parts that are bolted to the central block. I do not want to impede the heat transfer from the outside block to the inside cooling block. However, I would like to plate the...
  7. wchowe

    Has ANSI Y 14.5M been replaced?

    Has the ANSI Y 14.5M drafting standard been replaced by ASME Y 14.5M? If so where is an inexpensive place to purchase the specification? Thanks Bill
  8. wchowe

    Bond Strength on Mat'l Spec Sheet?

    Hi All I am using a piece of G-10/Fr-4 Laminate. I was reviewing the data specifications and found "Bond Strength"(sheet 2 attached). Can anyone tell me what that refers too? I am guessing, its the strength of the material parallel to the glass fabric? Although to have a tensile strength of 38k...
  9. wchowe

    Chemical Reaction w/ Copper and Vinyl in a fire?

    I was at friends the other day, we were having a campfire. He took something out and buried it in the fire. It almost immediately changed the fire from yellow and orange to blue and green flames? Turns out he put some cut lengths of a typical garden hose into a copper pipe. I was skeptical about...
  10. wchowe

    Zinc Coating Alternatives

    Hi All, I have some washers that appear to be zinc plated. We have been using them on our products. While the washer is used internal to the product and not exposed to the elements, there are instances of high humidity that occur. My limited experience with Zinc coatings is that they won't hold...
  11. wchowe

    Gloss and Smoothness Specifications for Paint

    How do I specify smoothness and gloss of a painted surface. Are there GLOSS numbers? What about smooth? Can I assume, because a surface has a certain gloss it must be smooth? Thanks Bill
  12. wchowe

    Material Compatability?

    Seems like this should be in all the tubing catalogs, but I can't find it. I am looking for a material compatability table for Polyurethane and Polyethylene tubing vs Ozone and/or Propylene Glycol. Does anyone have a good source or web link? Thanks Bill
  13. wchowe

    True Position?

    I have three holes on a common centerline. I want to maintain a close distance to the centline with respect to each other. However, I can allow the centerline a large tolerance from the edge of the plate. If I apply a large tolerance from the centerline to the edge won't each hole be allowed to...
  14. wchowe

    Galling of Stainless with Aluminum?

    Hi All, I had a failure Yesterday, and becasue it's a new product I don't have any history and would like to get some concensus on whether or not this is a problem. I have a large aluminum casting (356 T77) which has a tapped hole. Into the hole a stainless steel (316) pressure switch is...
  15. wchowe

    Will a BSPP fitting fit/seal in an NPT hole?

    I have serious doubts about this but it has been done in the shop so I wanted to see if I am missing something here. First, the application is a vacuum line. The female thread is a 1/2-14NPT. The male fitting is a 1/2-14 BSPP thread with an o-ring seal. I wouldn't think that combo would work. I...
  16. wchowe

    Duct Sizing, how to?

    Hi All, I need some help designing a duct for a laser. If you can picture a box that is 3ft square x 10ft long, thats the rough size of the laser. I get maybe 140 degree air at the top inside surface of the cabinet. I built some ducting that runs from the top of the cabinet down to the bottom...
  17. wchowe

    Swivel Hoist Rings vs Eyebolts

    I have a general question on lifting. As I understand it, an eyebolts lifting capacity gets derated as the lifting angle leaves the [b]Normal[b]. Swivel Hoist rings are NOT derated and carry the same load no matter what the angle. The load on the ring, of course, gets larger on the ring at...
  18. wchowe

    Tube Adapter Pipe Ends

    Guys, Companies like Swagelok (they call them "tube adapters") often employ a radial cut in the end of tubing to prevent their fittings from being pulled off of tubing at higher pressures. I believe this is more common on harder tube materials that are less likely to deform during the...
  19. wchowe

    Thermal Actuated Valves

    Hi all, I have an application where I want to control cooling water to a coil through a valve.I want the valve to be operated by the air temperature. When a set point is reached (35 deg C) the valve opens sending cooling water to the coil. Air is forced through the coil cooling it. When the air...
  20. wchowe

    Aluminum Extrusions

    I have a 6" OD x 1" wall x 95" lg aluminum (6061) tube that is used as part of our product. I am getting the tube in with a good deal of defects in the ID. There are axial grooves from the forming mandrel but also some craters roughly 1/2" to 1" in diameter. I desire a...

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