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  1. Jim Cliff

    Weld Symbols - ISO 2553

    Hi, I have received a set of drawings through for a frame I'm going to be making, but to be honest I don't fully understand the weld codes and symbols. Usually I'm welding up most of my own drawings and know from experience where and when I need to weld.... no problem. But in this case it's...
  2. Jim Cliff

    Co2 Vent Valve

    LittleInch, Many thanks for the reply... Much appreciated! Apologies for the poor diagram, this was meant as a rough model to show my thoughts. I quickly machined the valve this morning on the lathe. The ball I'm using is 8mm and sits well over the orifice. Having looked a few hydraulic check...
  3. Jim Cliff

    Co2 Vent Valve

    Any thoughts?
  4. Jim Cliff

    Co2 Vent Valve

    Hi, I'm trying to design and make a Co2 vent valve which basically releases pressure from a larger pilot valve causing actuation. I am using the small 16g Co2 cartridges which provide 55 bar of pressure. My vent valve is basically the same as a direct acting pressure relief with a manual pull...
  5. Jim Cliff

    CO2 12g cartridge pressure manipulation

    Zeusfaber, many thanks for your reply! It was extremely helpful and I greatly appreciate the time you've taken to explain this to me. One thing though. I am confused about where you have got the 22mL of liquid from? But basically, from your calculation..... In order to reduce the pressure...
  6. Jim Cliff

    CO2 12g cartridge pressure manipulation

    Hi all, I am wanting to reduce the 852.8 psi of pressure from a 12g CO2 cartridge. My application would ideally require 3 times less pressure at roughly 284 psi. I know there are pressure regulators, relief valves available. But in theory if I was to screw a 12g cartridge into a vessel /...
  7. Jim Cliff

    M30x2 Thread Tensile Loading

    Thanks all
  8. Jim Cliff

    M30x2 Thread Tensile Loading

    Where can I get a copy of these codes? Is there literature readily available that contain standard calculations for engineers for this calculation?
  9. Jim Cliff

    M30x2 Thread Tensile Loading

    Hi, I'm machining threads on to the ends of chrome rod for use in hydraulic rams. I have a ram which will see a maximum retracting load of 10 ton (98.1kN). For this I'm considering a thread of M30x2mm pitch. The chrome rod we use has a tensile strength of 550 n/mm2 with a yielding of 420 n/mm2...
  10. Jim Cliff

    Hydraulically controlled CNC axis

    Maximum travel rate would be 0.3-0.5 meters / second. Position control accuracy to 0.25mm Torque and force not calculated yet. Hydraulic circuitry & design not a problem, I can calculate and build this when required. I'm more focused on the electrical side of things at this stage of the...
  11. Jim Cliff

    Hydraulically controlled CNC axis

    Hi, I'm looking to build a 3 axis cnc machine about the size of a van. All 3 axis will be controlled by hydraulics and actuators will consist of 2 hydraulic motors (x axis), 2 rams (Y axis) and 1 hydraulic motor (y axis). I was thinking of using rotary encoders connected to each axis and fed...
  12. Jim Cliff

    Telemecanique TSX17.20 CPU fault

    Hi, I'm having problems with an old 1989 NUM TSX 17.20 plc which runs on one of our older CNC lathes (Somab Transmab 400). Basically the main 3-phase contactor is not being energised by the PLC. The trigger circuit for the contactor goes through numerous safety switches and numerous relays...

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