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  1. BrianPetersen

    How Can You Prevent Laser Cutting Machine Head Collisions?

    Yup. All of those are only as good as the data you enter ...
  2. BrianPetersen

    How Can You Prevent Laser Cutting Machine Head Collisions?

    Ultimately, the machine itself is blind. It can't see if there's something in its way. One thing we would do when retrofitting weld curtains or splatter guards or personnel barriers in robotic weld cells, is to make a rough prototype out of cardboard and duct tape to position that in the spot...
  3. BrianPetersen

    How Can You Prevent Laser Cutting Machine Head Collisions?

    Break-away mountings are possible in some cases, to limit the damage if you smash into something.
  4. BrianPetersen

    How Can You Prevent Laser Cutting Machine Head Collisions?

    CNC equipment in general has limited idiot-proofing. It might stop you running the tool out of bounds of the machine itself, but it has no idea where you've put clamps, fixtures, or parts of the workpiece other than whatever you are directly working on. +1 on the post above. Step through any...
  5. BrianPetersen

    Seat belt mechanism design

    It's a spring. The trouble with relying upon friction is that (a) it's inconsistent (temperature, humidity, spilled liquids that got into the mechanism, rust, age, etc), and (b) after the seat belt performs its inertial lock function, people expect to be able to release the tension on the belt...
  6. BrianPetersen

    Design for manufacturing - Laser Cutting or Water Jet Cutting technologies

    I don't understand this sentence. In the theoretical world, the drawing doesn't dictate the manufacturing process, it just identifies the critical features of the part and the relevant dimensions and tolerances, and it's up to manufacturing to figure it out. You do the drawing, you toss it over...
  7. BrianPetersen

    Design for manufacturing - Laser Cutting or Water Jet Cutting technologies

    Use rounded corners for the reason that MintJulep explained very well. Cutting followed by CNC is common, but make sure you have good datum surfaces to locate the part in the CNC fixture. The kerf width is non-zero and needs to be accounted for. Any positioning error (or error in kerf width...
  8. BrianPetersen

    Vehicle Anti-lock brake rotor system, increase horsepower, Brake Rotor takes 175 ft-lbs, 36 Hp to spin up, really? free wheeling the brake rotor

    By gut feel this sounds about right. Just out of curiosity ... Steel disk 400mm diameter and 20mm thick has a volume of 2513 cm3 and at 7.8 g/cm3 density of steel, that's about 19 kg, and considering that those dimensions are ruff approximations and I know the centre of the disk isn't full...
  9. BrianPetersen

    Vehicle Anti-lock brake rotor system, increase horsepower, Brake Rotor takes 175 ft-lbs, 36 Hp to spin up, really? free wheeling the brake rotor

    When doing calculations in proper SI units, "g" has no business anywhere unless the force of gravity is actually involved in whatever you are interested in, which is not the case here.
  10. BrianPetersen

    Vehicle Anti-lock brake rotor system, increase horsepower, Brake Rotor takes 175 ft-lbs, 36 Hp to spin up, really? free wheeling the brake rotor

    Engaging what is effectively a dog clutch when there is a large difference in rotational speed between them, breaks stuff. You're doing your calculations in imperial units, which are gibberish to me. I have no feel for whether that old-English imperial number is rational.
  11. BrianPetersen

    Vehicle Anti-lock brake rotor system, increase horsepower, Brake Rotor takes 175 ft-lbs, 36 Hp to spin up, really? free wheeling the brake rotor

    The inertia of the brake rotor is small compared to the inertia of the wheel and tire assembly. Reason: the tread of the tire has the full radius of the assembly contributing to the moment of inertia, and the sidewalls of the tire have most of it contributing. And at least on any of my vehicles...
  12. BrianPetersen

    Threaded Connection of Aluminium Components

    Automotive/motorcycle engines and transmissions use steel fasteners threaded into aluminium everywhere. Thread inserts are only used for repair purposes but if you anticipate frequent dismantling, they may be a good idea. Thread sizes are commonly M6x1.0, M8x1.25, M10x1.25 (this appears to be...
  13. BrianPetersen

    find equal belt between megadyne and power grip timing belt

    Found quickly by internet search https://megadynegroup.com/usa/products/timing-belts I will let you press the appropriate "contact us" or "request information" buttons or the links to more specific product ranges further down the page.
  14. BrianPetersen

    offshore installation vs onshore installation

    Those of us who are being called upon as mind-readers (i.e. everyone except the original poster) has absolutely no clue what sort of "rotating equipment" the original poster is wishing to install "offshore" (?) versus "onshore". The 9.9 horsepower Evinrude outboard motor - which contains...
  15. BrianPetersen

    Reciprocating Compressors

    ... and what mass or volume flow rate or horsepower? And how long is it expected to remain in service? Your inlet pressure in proper SI units is about 1 bar (1 atmosphere) and the discharge pressure around 8 bar ... nothing special. My 2 horsepower shop air compressor (ordinary piston and...
  16. BrianPetersen

    Parallel hybrid EV with direct torque coupling - torque ratings of components

    The rotor of an electric motor has a certain amount of rotational inertia, called the "moment of inertia" I. It's like a flywheel. Accelerating (deceleration = negative acceleration) a flywheel to a certain rotational speed in a certain amount of time requires a certain amount of torque in the...
  17. BrianPetersen

    Parallel hybrid EV with direct torque coupling - torque ratings of components

    We haven't the faintest clue of the type of vehicle that the original poster is designing (possibly something off-road and thus not subject to requirements for all the nannies that a developed-world road vehicle has), nor where in the world it is destined to be used (possibly something outside...
  18. BrianPetersen

    Parallel hybrid EV with direct torque coupling - torque ratings of components

    The transmission may be "capable of" producing much more output torque than the motor and drive in question is, but if I understand the mechanical layout correctly, that full output torque is never "passing through" the motor and drive in question. What it means is that if the motor seizes a...
  19. BrianPetersen

    Reciprocating Compressors

    Also note that your original question was basically "Can a compressor be designed without a crosshead" and given that the 2 horsepower 120 psi air compressor in my shop does not have one, the answer is "Yes". You did not ask whether any and all compressors regardless of application no matter...
  20. BrianPetersen

    Reciprocating Compressors

    How about specifically identifying the application? What's it compressing, what's the inlet and outlet pressure, what's the volume flow rate, give us a specific application? My post referenced air compressors because that's what I've seen. Tugboat identified natural gas compressors and...

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