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  • Users: EngMark
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  1. EngMark

    Assembly Inverted & Transparent

    I'm working in SW2010 (yes, I know its 2017) on a PC configuration that's been quite stable for the last few years. I've been working on an assembly for the last month or so. Tonight that assembly crashed in some fashion. As it did so I checked other parts and assemblies I have open in SW and...
  2. EngMark

    Housing Allowance For Temporary Engineering Assignment

    I am a mechanical engineer with a P.E. and decades of experience in varied automotive and machine design positions. For the last 7 years I've gone out on my own in private practice doing engineering, CAD, fabrication, prototyping (I have access to an awesome shop). For the last few months...
  3. EngMark

    Unscrewing Mold - Bottle Cap

    I have a need to make a 24/410 polypropylene bottle caps with a unique external shape. Money is short and time is more plentiful. I know that bottle caps are most often made in 30+ cavity molds running short cycle times. I'd be happy to get one cycle per minute or two from four cavities with a...
  4. EngMark

    Bicycle Engineering

    I am working with a client that has asked me to design a bicycle component. It looks as if there will be additional bicycle component work coming from them. I am the sole engineer on this, and I have no professional bicycle specific expertise. I'm struggling with determining the appropriate...
  5. EngMark

    Machine Controller

    Not sure where this should most properly be posted... As background, I'm a mechanical engineer with extensive automotive experience but lacking in machine controls experience or applicable programming experience. I'm building a one off packaging machine in which much of the action is centered...
  6. EngMark

    Specifying Opacity Of Parts

    I have two pigmented semi-transparent parts which will be made from different resins by different suppliers. They both need to be visually similar in color and degree of semi-transparency (opacity?). One would be polypropylene 1mm thick and the other would be silicone rubber having three...
  7. EngMark

    Cylindrical press fit of plastic components / Creep

    I have a high volume product application in which a plastic tube needs to be press fitted into a plastic socket and must remain retained for ~2 years. Obviously press fits without welding, screws, ribs, locking tabs, welding, etc. in plastic aren't ideal, but press fits on competitor parts are...
  8. EngMark

    Shafts for "bearingless" hydraulic motors

    The manufacturers of low speed gerotor / geroler type hydraulic motors often offer a "bearingless" version of their motors which don't have the output shaft and bearings included. These are to be used with a device such as a gearbox which has a shaft with internal splines and bearings. The...
  9. EngMark

    Source of inexpensive worm & worm gear?

    I need to convert a small automotive differential (exact model is still discussable) to have a 12:1 (10:1 - 15:1) reduction in place of the usual ~3.5:1 ring and pinion gear. I need to find a hardened worm and bronze worm gear at a reasonable price that could be modified to work. The worm...
  10. EngMark

    Help me I'm lost and looking for my pump!

    I'm a mechanical engineer but I have no hydraulic experience. I'm trying to find the right pump to design into a machine I'm working on. The machine would be powered by a variable displacement pump directly coupled to a 28 hp Kohler (or similar) engine. After wading through an endless...
  11. EngMark

    Hydraulic pump selection help needed please

    Strange that there are no clearly defined categories for hydraulic power component questions on Eng Tips... I think I have a fairly good idea of what I need but I'm getting lost in searching through the online catalogs trying to find it. It seems that there are a lot of pumps that do most of...
  12. EngMark

    Hybrid Motor Controller Developer Kit?

    I'm not sure where to ask this question, here in the hybrid section or in the electrical motor control section. I'll try here first because I think the expertise needed is more from the hybrid side. I am beginning development of a system which would consist of a battery array, a motor...

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