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  • Users: vagulus
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  1. vagulus

    Air leaks through 3D Printed PLA

    I posted this on another forum. I hope no-one minds. No-one on the other forum had any answer. Perhaps someone here will. [thumbsup2] My current prototyping project involves an air ram which I use as a pump. Its cylinder is drawn copper tube (150mm nominal) and its head and tail are 3D...
  2. vagulus

    Liquid lubricant for 3D printed pneumatic ram

    My pneumatic ram actuator, built for a mechanical model I am making, is made out of what most folks would call plastic. Head, tail and piston are 3D printed in PLA, cylinder and spear are made from PVC water pipe and the O-ring is nitrile. Actually created as an air pump it is functional in that...
  3. vagulus

    Nitrile O-ring Lubrication

    My pneumatic ram actuator, built for a mechanical model I am making, is made out of what most folks would call plastic. Head, tail and piston are 3D printed in PLA, cylinder and spear are made from PVC water pipe and the O-ring is nitrile. Actually created as an air pump it is functional in...
  4. vagulus

    The passing of British Standard Pipe Threads

    As one whose working life involved frequent use of BSP Threads I have yet to come to terms with BSP's replacement in a Metric World. I am looking for a chart which gives me Standard BSP sizes down one side and their Metric Replacements down the other. I'd also like to know if a 15mm BSP thread...
  5. vagulus

    Windpower Generators

    Why is it that the electricity generator windmills we see being erected all over the world, both on land and offshore, are always three-bladed? I would have thought that six blades would give the potential of twice the power output. ---------------------------------------- Artificial...
  6. vagulus

    Creating M27x3 Tapered Plug

    Creating a tapered thread using a 3D Printer is very much akin to single-point cutting a thread on a Centre Lathe. I trust I am not the only one left with such memories tongue. Currently I am attempting to create an M27 tapered plug using the standard BSPT format including the standard taper of...
  7. vagulus

    Manually cutting BSPT thread

    Creating a tapered thread using a 3D Printer is very much akin to single-point cutting a thread on a Centre Lathe. I trust I am not the only one left with such memories [tongue]. Currently I am attempting to create an M27 tapered plug using the standard BSPT format including the standard...
  8. vagulus

    Mass and Force

    I always get confused. It's never gone away. Assume I have a piston 170mm dia. in a vertical cylinder. Assume zero friction. Assume perfect seal. What must the piston weigh to maintain a pressure of 0.1Bar in the cylinder? (You wouldn't believe the variety of answers I have calculated...
  9. vagulus

    Bernoulli terrifies me

    Anything beyond integer mathematics is a struggle for me and the thought of chaining myself to Bernoulli's Equation for a month to figure this out gives me nightmares. Can someone please give me a quick, off the cuff, answer? I have a gas flowmeter from an argon welder (MIG/TIG). You've no...
  10. vagulus

    What is the angle of taper on BSPT Male Thread?

    What is the angle 'alpha' shown here? As a point of interest, why is it not shown in all thread diagrams of BSPT Male Thread? Thanks ---------------------------------------- Artificial Intelligence is no match for Natural Stupidity
  11. vagulus

    How well does a thread function as a labyrinth seal?

    I am working on a hand-operated hydraulic device which involves a shaft being forced into a closed cylinder by a screw thread thereby creating the hydraulic pressure. This is hardly patentable, but it created an interesting problem. For the purposes of sealing around the shaft, the original...
  12. vagulus

    What makes a 'White Paper'?

    I just downloaded the 'White Paper' entitled 'Mishimoto Automotive'. Disappointed is a word that springs to mind. Surely there is more to the term 'White Paper' than is fulfilled by a sketchy, one-page advertisement. ---------------------------------------- Artificial Intelligence is no match...
  13. vagulus

    Force required to fit bearing

    I know that asking for an accurate formula for the force required to fit a bearing onto a shaft (or a shaft into a bearing) is like asking for a three-word solution to Fermat's Last Theorem, so I am not going to ask for one. [thumbsup2] However, if there is someone practiced in such Black Arts...
  14. vagulus

    Is there a standard symbol set?

    In the study of Engineering I am constantly plagued by the haphazard use of symbols. The latest offence was this (from my textbook which shall remain unidentified to protect the guilty [wink]) My author has moved from using 'N' for Newtons to using it for rpm (arguably, for a Number of rpm)...
  15. vagulus

    Multi-row bolted lap joint calculations

    How do I calculate the UTS of a multi-row bolted lap joint like this? Anything I find in PDF involves someone's thesis (a bit over my head) or only involves one bolt (not much help). Can someone point me to something in the middle for the case shown? Thanks
  16. vagulus

    Seeking material properties information

    After some time searching the Net I have yet to find some ready-reference to material properties such as density, UTS, Rockwell Hardness, Youngs Modulus, etc. [banghead] I have come to the conclusion that there are so many variants within material types (take carbon steel for example), and so...

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