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  1. RAndres

    Basic Electrical CAD software

    Agree that AutoCAD is a good fit.
  2. RAndres

    Specing a Disconnect per NFPA 79

    I need to call out a disconnect for a 480V 3 phase enclosure. I've been reading my way through NFPA 79, but have some questions. The device will be moved to different plants, not just within a plant. In other words, I don't know what the supply short circuit and fault currents could be. That...
  3. RAndres

    Manual Pick & Place assist devices, and how to select one

    Thanks for your thoughts. Itsmoked, I like the method you're describing. This will be to build small numbers of R and D boards in house. If we need higher quantities, I doubt we can beat the pricing of a dedicated board house. For those small numbers, getting an automated machine programmed and...
  4. RAndres

    Manual Pick & Place assist devices, and how to select one

    I'm considering picking up one of those desktop pick and place assist devices. Usually a set of slides that allow an operator to move their hand over the pcb without disturbing previously placed parts and solder, along with a vacuum pick up to get parts and precisely place them. They often offer...
  5. RAndres

    Creating documentation for control cabinets

    I'm working on a project which will require a custom control cabinet. Power supplies, disconnects, fuses, several assorted controllers, etc... I've seen and used documentation for this kind of cabinet in the past, but haven't had to build and document to date. Sadly, I don't have access to the...
  6. RAndres

    How to crimp to NiChrome spiral wire with glass fiber core

    Compositepro, constant tension spring clamping sounds like a good solution. If you have experience with any, can you point me toward an example connector like this?
  7. RAndres

    How to crimp to NiChrome spiral wire with glass fiber core

    I've got a requirement to crimp to a spiral heating wire. It's a NiChrome resistance heating element, which is wound as a spiral around a core of glass fibers. It's covered with a layer of foam rubber like insulation, and then with a woven fiberglass covering. My understanding is that NiChrome...
  8. RAndres

    Difficult connectivity issue

    It's the tight bend at the edge of the round board that worries me. From what I read, 10x thickness is the small end of good design for static bend. Actual dynamic flex applications call for a good bit more to avoid hardening. Maybe there's a way to have the flex exit before the edge of the...
  9. RAndres

    Difficult connectivity issue

    I appreciate all your thoughts, especially Dan and VE1BLL. The BGA is an image sensor, so must face out of the cylindrical housing. The best solution I've come up with to date is a flex circuit between the two boards. The diameter of the round board must fit within the housing's 9.5 mm ID, so a...
  10. RAndres

    Difficult connectivity issue

    Unfortunately the BGA HAS to be oriented as shown. I've looked at connectors, and the style used in phones and things like that using flat flex are the smallest I've seen. They are almost small enough to work, but not quite. If I pare down to the absolute minimum I need 16 connections, which may...
  11. RAndres

    Difficult connectivity issue

    I've got a tough connectivity issue. I need to place a BGA with ~100 balls on a round PCB. The board is not much larger than the footprint. It's about 0.1 inch larger radius than the minimum possible given the inscribed rectangular part. The part is .340 x .245 inch. I need to bring about 20...

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