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  1. kjoiner

    Standards on filling holes with weld

    Can you use Clecos to locate and hold the parts together for welding? If so, you would only have a 1/8" hole to fill. We do that on large sheet metal cabinets we make. We don't to the fabrication, but the holes are in the design per suggestions from the fabricators. Kyle
  2. kjoiner

    Beam bending refresher

    Questions: 1. What happens when the beam slips the catch? Does the beam suddenly drop? 2. How far does the loaded beam fall? A 2000lb load plus the weight of the beam itself is substantial. If you want a beam fixed translationally but free to rotate on one end, your beam will need a pinned...
  3. kjoiner

    Air leaks through 3D Printed PLA

    Can you increase the perimeter number? That will result in a thicker skin for the sliced part and may help reduce leakage.
  4. kjoiner

    brass scrapper material

    What about using a steel blade for stiffness but mounting a piece of brass at the edge.
  5. kjoiner

    Process Column falls off of Transporter

    There were 2 fatalities and 1 injury: https://www.yahoo.com/news/2-dead-1-hurt-350-200443497.html
  6. kjoiner

    Fine Thread vs Course Thread

    Questions: 1. What is the application? 2. What type of material? 3. What is the gage of sheet metal? These questions will help guide you in selecting the type of fastener. As mentioned above, there are screws specifically for sheet metal and there are process options for the metal itself...
  7. kjoiner

    An unintended consequence of using GPS is threatening Vermont's historic covered bridges...

    The 11 foot 8 bridge. Maybe the covered bridges need something like this or pop up bollard posts to stop over-height trucks.
  8. kjoiner

    Learning to operate Manual Lathe for Basic Ring Machining

    Hello, What type of ring are you wanting to machine? Is this a ring for an industrial application or is this jewelry? What type of material do you want to use? Every material has different machining characteristics. What type of lathe do you have access to? Is this a smaller bench top...
  9. kjoiner

    Alaska Airlines flight forced to make an emergency landing...

    Here is an article about one of the suppliers to Boeing: https://nypost.com/2024/03/12/us-news/faa-audit-of-boeings-737-production-found-mechanics-using-hotel-card-and-dish-soap-as-makeshift-tools-report/amp/
  10. kjoiner

    Off the shelf rack and pinion parts

    Try: Stock Drive Products W.M. Berg Igus Misumi Kyle
  11. kjoiner

    RPN Calculator? RIP HP 35s

    I'm using an HP48GX app on my android phone as well. My HP48GX died after 31 years but I've been using the app for several years now anyway.
  12. kjoiner

    Subducing Head:-pneumatic motor idea

    @3DDave "kjoiner - applying pressure to both sides is how gas struts work. The piston moves because the pressure on the rod area is unopposed by the outside atmosphere. Gas struts have a hole in the piston to allow material to flow from one side to the other, through an orifice to control the...
  13. kjoiner

    Subducing Head:-pneumatic motor idea

    @Uncanny3 I think you are missing some information on pneumatic cylinder construction. The two ports feed to either side of the piston. The rod is just a way to transmit the motion of the piston. If you apply pressure to both ports, the piston will not move. Here is a cutaway of a cylinder...
  14. kjoiner

    Scientific Calculator

    My HP48GX died a few months ago after 32 years. For several years, however, I've used an HP48GX app on my android phone. I haven't fully explored everything the app can do but have not run into any roadblocks. If you like RPN calculators, I've been pretty happy with it. It even looks like...
  15. kjoiner

    Number of poles for circuit breaker when using 230VAC power to a motor on international power

    Hello, LittleInch -There is no such thing as "International countries"...." You are correct. Basically, I want to be compatible with countries outside of the US and Canada where voltages and frequencies are different. I will be working closely with our testing lab to evaluate performance...
  16. kjoiner

    Number of poles for circuit breaker when using 230VAC power to a motor on international power

    Hello, Thank you for the answers and information. Here is some additional information and background. In the past, we used an autotransformer to drop the voltage from 230 to 110. Going forward, we want to avoid this since it's an additional supply chain issue and some customers do not like...
  17. kjoiner

    Number of poles for circuit breaker when using 230VAC power to a motor on international power

    ""International" is very vague." That's exactly my concern. I see numerous types of plugs - some two pin, some three pin etc. depending on which country. For switching main power to the entire machine, we are using a two pole switch to ensure we get both the hot and neutral no matter which...
  18. kjoiner

    Number of poles for circuit breaker when using 230VAC power to a motor on international power

    Hello, We are revising the power section of our machines to allow the use of 110VAC or 230VAC single phase for domestic and international use. We already use switching power supplies so DC power output is not an issue. We also use a an AC gearmotor that runs on line voltage. To address the...
  19. kjoiner

    Fire shuts down I10 in LA

    It sounds like they did not learn from GDOT when the I85 bridge near downtown Atlanta collapsed. That fire was due to people starting a fire that became significantly larger due to GDOT storing items such as large spools of polyethylene conduit and numerous other flammable items under the...
  20. kjoiner

    Free body diagram and cylinder force help

    To me the case that determines the required cylinder force is when the door is fully open. The force vector of the cylinder is way past perpendicular from the arm. A lot of the cylinder force is in the X axis. The free body diagram at that position will tell you the perpendicular force...
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