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  1. SceneryDriver

    Draft in moulding

    A little late to the party, but this may be of some help: https://www.youtube.com/watch?v=RMjtmsr3CqA SceneryDriver
  2. SceneryDriver

    What are the applications of Spring Return handles (Deadman handle) for ball valves?

    We have spring loaded ball valves on the 55gal drums of carpenter's glue in the carp shop. Apparently, years ago, some muppet carp forgot to close the valve after filling their glue bottle. 55gal of carpenter's glue is tough to clean up. SceneryDriver
  3. SceneryDriver

    At what load will this bracket start to un-bend

    The climbing industry already makes what you're looking for. It's called a knot passing pulley; it allows a knotted rope (or two, tied end to end) to pass through the pulley. It's also a split sheave, so it's easy to get off the cables you just pulled...
  4. SceneryDriver

    Electroless tin plating

    I used some electroless tin plating solution to tin plate the copper traces on a PCB that I made in a class in college, years ago. The stuff worked great... on copper. Anyone have any idea if it will plate mild steel? I have some small brackets I'd like to add a little corrosion resistance to...
  5. SceneryDriver

    Overloading a Servo Through the Trigger Pin?

    24V will absolutely damage the servo. Those are RC servos, and expect a ~5V PWM control signal. Most are designed to run on 4.8 - 6V (NiCad battery voltages). A few can operate on up to 7.2V. REALLY large RC servos can have separate motor power (12V or 24VDC) but still expect to see a 5V PWM...
  6. SceneryDriver

    Bolt and Nut with Vertical Axis Connecting Beam to Column

    Does it really matter? Either way, you'll have hardware falling on someone if the joint loosens. Followed very shortly thereafter by the piece of beam that the bolts and nuts were holding in the air. Design the joint properly, and assemble it properly, and nothing should fall out of the air...
  7. SceneryDriver

    Research Lab Power Distribution

    We have hundreds of feet of 3-phase 208/120V Starline in the shop where I work, and it's very reliable. It is similar in concept to track lighting connections, but MUCH more robust. It's designed for industrial use. Correct procedure is indeed to power down the run before adding or removing a...
  8. SceneryDriver

    3D object color changing on its own

    I have a 3D solid object (wire duct from Panduit) imported into AutoCAD 2015. I imported the .STP file from the manufacturer via the IMPORT command. I had to EXPLODE the object at least once (maybe twice) in order to be able to slice it for length and alter its color. The object's color is...
  9. SceneryDriver

    VSD Cracking and Smoke presence

    Was incoming power attached to the motor output terminals instead of the power input terminals? That would let the smoke out quickly. SceneryDriver
  10. SceneryDriver

    Picking a motor?

    Stepper motors must be significantly over-sized in applications like this. "Sufficient" torque may not account for real world effects such as occasional binding due to dirt, imperfect assembly, etc... If the motor isn't over-sized, it can start missing steps, and accuracy will suffer. A good...
  11. SceneryDriver

    Mounting a Strut to Switchgear

    The effectiveness (or lack thereof) of lock washers has been discussed over and over on this forum. http://www.eng-tips.com/viewthread.cfm?qid=370111 They are of very little use when it comes to vibration induced loosening. Nylok washers are better - I use them all the time in electrical...
  12. SceneryDriver

    Slip Ring for a "J" thermocouple.

    Late to the party, but: Is there a reason you can't place a T/C-to-4-20ma loop powered transmitter on the rotating part of the machine, and transmit 4-20ma through the slip ring? It would do away with all the issues of dissimilar metals in the slip rings, and the current signal is arguably...
  13. SceneryDriver

    Shipping products with casters attached

    Talk to these guys: http://www.anvilcase.com/products/ Road cases for touring productions do exactly what you're asking for. They can be made with pockets in the top to accept the casters of another stacked case. Every rock 'n roll tour since ever uses these type of cases. They're pretty...
  14. SceneryDriver

    K-Factor A Concern If Supplying LED / CFL Lighting?

    Ebay is a great idea! http://www.ebay.com/itm/20kVA-Single-Phase-Transformer-input-240-220-208-vac-output-208-120-vac-/321306408701?pt=US_Uninterruptible_Power_Supplies&hash=item4acf5ab6fd SceneryDriver
  15. SceneryDriver

    Polyetheylene to Polycarbonate - Adhesive

    This may work for you, although it dries through solvent evaporation. That may eliminate it from your consideration. Why can't you use a solvent-based adhesive? I've used this before with reasonably good results on polyethylene tubing; it will stick with no surface prep, albeit with a...
  16. SceneryDriver

    help needed to identifi a key 8mm to 5mm

    Option #4: http://www.mcmaster.com/#key-stock/=ut3nap Click on "step" keystock. SceneryDriver
  17. SceneryDriver

    KNOCK OUT

    If you can un-mount the door, laser cutting or water jet cutting can be a viable and cost effective solution. A jig saw will certainly work; use a fine tooth blade, and work slowly and carefully. Cover everything around the holes with blue painter's tape. The tape will prevent the vibrating...
  18. SceneryDriver

    Helipad Lighting

    As a private pilot, I can attest to the mic-click receivers being a bit, well... temperamental. The runway lighting at small uncontrolled airports is often controlled this way. 3 clicks: lights up at Low 5 clicks: lights at Medium 7 clicks: lights at HIGH Auto-off after some predetermined...
  19. SceneryDriver

    240VAC single phase to 650VDC voltage doubler / boost converter.

    I think you will have trouble at that power level. You can derive approximately 340vdc by full-wave rectifying 240vac and filtering it. Capacitive voltage multiplier circuits will work to get you the voltage you desire, but would have to be physically HUGE to achieve your desired amperage...
  20. SceneryDriver

    Electrically Isolated Light indicator for a current carrying conductor

    +1 on CR Magnetics: http://www.crmagnetics.com/Products/CR2550-P13.aspx Can't beat the price at $12.35, either. SceneryDriver

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