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  • Users: Baheej
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  1. Baheej

    Metal Temperature Color Chart

    I'm heating a part made from 8620 steel for a shrink fit assembly. At around 400F the part starts to change color. I'd like to be able to track its temperature by its color and without depending on the oven's gage. I heard from some coworkers that there is a chart for steel that gives you a...
  2. Baheej

    Splined Bushing Teeth Hardness

    We are trying to shrink fit a splined bushing onto a rotating shaft. To be able to transmit the application torque thru the shrink fit connection, both shaft and bushing are machined to very close tolerances. The bushing needs to be heated as high as possible (no more than 300C/570F) to achieve...
  3. Baheej

    Shrink Fit - Part Hardness Problem

    We are trying to shrink fit a splined bushing onto a rotating shaft. To be able to transmit the application torque thru the shrink fit connection, both shaft and bushing are machined to very close tolerances. The bushing needs to be heated as high as possible (no more than 300C/570F) to achieve...
  4. Baheej

    Preventing Induction While Towing

    We have a permanent magnet AC motor on a vehicle. When the vehicle is being towed, the motor might induct current. Is there is a way to prevent this from happening without disengaging the mechanical connection between the wheels and the motor? Thanks.
  5. Baheej

    ANSI B92.1 Spline Drawing

    I asked our Generator supplier to make the input shaft splined with a 15T 8/16 spline to easily mate them with the gearbox and now they are asking me for a detailed drawing of that spline profile. Does anybody know how or where can I find that drawing? Is it included in the ANSI B92.1 Standard...
  6. Baheej

    Spline Selection

    How do I size and a select the right spline for a certain application? I know the torque, rpm and a starting shaft size. Any design books you can recommend? Thanks.
  7. Baheej

    Neoprene Shrinkage

    I'm using a commercial quality adhesive backed neoprene rubber sheet to make sealing gaskets for an access panel. A week after assembling everything together, our QA noticed that the gasket had shrunk in size and that the corners of the access panel are no more sealed. The screw holes that were...
  8. Baheej

    Thermal Interface Material Challenge

    Gurus, I need a thermal interface material between an electrical/electronic device and an Aluminum heat sink. The surface of the device is not flat and mostly is non-uniformly concaved. The out-of-flatness is about 0.060" at the highest concaved point of the surface. The device surface is 15" x...
  9. Baheej

    BOM for a Large Sub Assembly

    Hello everybody, I have two assemblies A1 and A2. Assy A1 contains sub assemblies SA1, SA2, SA3 and SA4 Assy A2 contains sub assemblies SA1, SA3, SA5 and SA6 This is what I need to do: I need to create drawings for all the sub assemblies SA1, SA2.......SA6, showing a BOM and balloons of all...
  10. Baheej

    SAE Standard for Composites Delam

    Is anybody aware of any SAE standard (or any industry standard) for delamination limits due to machining in composite parts? Thanks,
  11. Baheej

    Material Specs and Delamination in FR4 Board

    Hello all, We just received a shipment of FR4 boards (1/4" thk) from our supplier. The boards are about 11"x31" with a rectangular hole pattern of 48 holes (4x12). Almost 80% of the holes show delamination around their edge. Now, my QA wants to reject the parts because of concerns of...
  12. Baheej

    Flowmaster, how good is it?

    Anybody here used Flowmaster? The idea of a 1D CFD seems a bit over simplified, but it might be ok for initial component sizing and such. Any ideas, comments, experiences? Thanks.
  13. Baheej

    Locating Tubular Cable Lugs (Metric size)

    We are looking for Tubular Cable Lug (35mm3 conductor size, bolt size M10). This seems to be an impossible size to find in the US. One of the suppliers offered a quote for a minimum qty of 5000. All we need is 100-200 max. Any ideas how can I get this kind if lug in small quantity and in a...
  14. Baheej

    Building our own heat sink

    We are considering building our own heat sink inhouse to try and cut most of the custom work cost. The heat sink will mostly be a sandwiched folded fin between two sheets. My question is: how and what is the best way to attach the fin to the sheets? Brazing, spot welding, ...etc. This part can...
  15. Baheej

    Recommending a CFD Consultant

    We need to do some CFD work to analyze one of our products; air flow over a heatsink, nothing too complicated. Could you please recommend any good CFD consultants/companies to approach, preferably in California or on the west coast. I already contacted a few, including ANSYS and Fluent, but I...
  16. Baheej

    Corrosion of Copper Connectors

    Did anybody out there have had any experience with Copper high voltage connectors used on Aluminum terminals (6000 or 7000 alloys). We are considering using the RADSOK connectors between electrical components that have Aluminum terminals and we'd like to know if there is anything that we can do...
  17. Baheej

    Biomech Grad School Questions

    I already posted this on the Biomechanics forum (http://www.eng-tips.com/viewthread.cfm?qid=128310&page=1), but I think belongs on this forum intead: As an extension to an earlier thread (http://www.eng-tips.com/viewthread.cfm?qid=127907&page=1), I'd like to inquire about going back to grad...
  18. Baheej

    Grad School Questions

    As an extension to an earlier thread (http://www.eng-tips.com/viewthread.cfm?qid=127907&page=1), I'd like to inquire about going back to grad school in Biomechanics. I've been a Mechanical Engineer since 1993 and now I'm thinking about switching into Biomechanics, starting by going for a PhD in...
  19. Baheej

    Roxtec sealing system

    Hello all, Did anybody have the chance to use any of Roxtec (www.roxtec.com) sealing systems/modules? From their web site, the seal modules look neat and clean, but I'm not sure how efficient and robust are they. I'm designing a bulkhead interface, through which I'm running cooling lines and...
  20. Baheej

    Finding thin-wall, large-diameter tubes.

    Hello all, We are building a plumbing assembly for a fuel cell system and we are having a hard time locating most of the tubes we need, especially thin-walled ones. I've tried many of the companies listed on Thomas Registry, but most of them don’t stock those size and those who do, don’t have...

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