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  1. kjoiner

    Spring Modeling Help (Solidworks)

    I use Solid Edge instead of Solidworks but I have created springs over the years and have used these methods: 1. Download from McMaster Carr as the fastest route 2. If the spring must be adjustable and move with an assembly, I just model a cylinder. For extension springs, I just create a ring...
  2. kjoiner

    Connector to casing assembly design

    Is the design for the metal connector finished? If not, maybe a groove for a snap ring would work.
  3. kjoiner

    A modular profile (item) construction - tolerances?

    One other factor to remember when using 8020 type extrusions is many of the fastener types for those extrusions rely on friction. If you are generating a vertical load, there may be a possibility of the joints slipping and throwing off your parallelism between the two plates.
  4. kjoiner

    Fine Dyno tuning

    I'm far from an expert but you might want to check out the show "Engine Masters". It was on Motor Trend but you can probably find it on Youtube. The reason I mention it is because they did several episodes where they tested those very changes. One episode focused on exhaust system variables...
  5. kjoiner

    Welding Symbols

    Some of the bends look like compound curves. Is this part stamped or formed on a press brake?
  6. kjoiner

    Compression Ignition in Pneumatics

    Not completely relevant but high power spring piston air guns can experience "dieseling" if excess oil is in the compression chamber. Some people think it's a way to get more power and intentionally put oil in the chamber but that comes at the expense of damage to seals and other components. Kyle
  7. 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
  8. 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...
  9. 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.
  10. kjoiner

    brass scrapper material

    What about using a steel blade for stiffness but mounting a piece of brass at the edge.
  11. 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
  12. 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...
  13. 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.
  14. 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...
  15. 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/
  16. kjoiner

    Off the shelf rack and pinion parts

    Try: Stock Drive Products W.M. Berg Igus Misumi Kyle
  17. 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.
  18. 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...
  19. 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...
  20. 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...

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