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Recent content by AllAngles

  1. AllAngles

    To Terminate or Not?

    Thanks, guys - I will terminate them to ground for the time being. Gunnar - not having trouble with this big decision, just not my area of expertise and I've found good standards and/or guidelines on nearly every aspect of wiring an enclosure that I'm following, but nothing about "leftover"...
  2. AllAngles

    To Terminate or Not?

    I'm building a machine that has a 25-pin shielded conductor cable between the control box and the equipment itself. At the moment, I am using 17 of the conductors leaving others open for possible future expansion (though we have no immediate plans for them). My question is whether or not I...
  3. AllAngles

    Finishing Suggestion for AISI 1144 Turned Part

    Quantities are 500 pieces at a time about every 3-4 weeks. The parts are being fed through-collet on a CNC lathe so any kind of manual operation like scotchbrite or equivalent would add significant cost. I'll talk with the shop and see if they've tried your suggestions on getting a better...
  4. AllAngles

    Finishing Suggestion for AISI 1144 Turned Part

    I have a CNC turned AISI 1144 shaft that is about 140mm long and 10mm OD. There is another (aluminum) piece that fits over the shaft that must slide smoothly along the axis and I am using composite bearings pressed into the outer sleeve for the interface which works well. The issue I'm having...
  5. AllAngles

    Variable Intake w/ VVT

    The new 6.4L HEMI from Dodge features both VVT and an "active" intake design. One good place to start might be exploring how existing systems function and why. Then you can idenfity where concessions had to be made for packaging, reliability, cost, etc. and see which of those concessions you...
  6. AllAngles

    PWM Motor Controller/Amplifier

    Dan - no need for the motors to perform identically, in fact it would be impossible as they will probably never see identical loads - though it should be close. If the circuit was prone to one motor ALWAYS doing the heavier lifting, that could be a concern. My expectation, though, is that the...
  7. AllAngles

    PWM Motor Controller/Amplifier

    Yes, Dan - both motors will be included in the loop. I've added a 2nd motor to the diagram to indicate how it will fall in place. Physically, the flyback diode will be built in to the new device across the output connectors. But, both driven motors will essentially share the same signal...
  8. AllAngles

    PWM Motor Controller/Amplifier

    The module that currently generates the PWM signal also implements the control logic and is a CAN bus node - neither simple nor inexpensive to reproduce. We have verified through experimentation that the control logic is able to compensate (it's closed loop) for the additional motor. All we...
  9. AllAngles

    PWM Motor Controller/Amplifier

    We will turn it over to an EE if this direction looks promising as a solution to this need. Is the concept sound or are we barking up the wrong tree? There are other more "brute force" simple solutions, but this seems like it could be elegant and cost-effective for our need. Mikah B...
  10. AllAngles

    PWM Motor Controller/Amplifier

    I'm working on an application where I need to intercept an existing PWM signal (~120Hz, 0-12.0V) - which is limited to 20A max current - and output an identical signal with a capacity of up to 60A. The signal controls a single brushless DC motor but my application will add another (identical)...
  11. AllAngles

    Manifold inlet/outlet orientation question

    Not blending two gasolines, just adding another pump to an existing system to make more volume available downstream. Yes, the manifold is small. I have some ability to make it larger, but as the size increases, flexibility around shape would decrease due to packaging constraints. Calculator...
  12. AllAngles

    Manifold inlet/outlet orientation question

    Fluid dynamics is outside my expertise and well outside my normal area of work, so looking for some "rule of thumb" type guidance. The reality of the application is that other restrictions downstream make this component nearly moot, but I want it to be right regardless and hopefully I'll learn...
  13. AllAngles

    Anybody have experience with investment cast gears?

    Terry, thanks for the suggestion about roll-forming, I had not seen that option presented elsewhere. We may be able to get away with a softer stainless, roll forming would probably work harden the teeth a bit anyway. Monkeydog - was this recently? Everything I've read and been told says that...
  14. AllAngles

    Anybody have experience with investment cast gears?

    I expect 10,000 to be the high-end of annual volume. Our product is offerend in various sizes and configurations, each particular gear set fitting only one combination thereof - 10k would be what we expect to be our most popular (budget) model That said, $15k in tooling wouldn't be the end of...
  15. AllAngles

    Anybody have experience with investment cast gears?

    Yep, that was my first choice. Surface area of the larger gear is apparently large enough (about 5.5in^2) that it's not very practical, at least with stainless. Thanks!
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