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  1. dvd

    Hole size with tolerance for Shaft

    Curious if you measured shaft diameter to .355 mm accuracy, or if this is a drawing dimension (260.355 mm is very close to 10.250 inches). You can find a reasonable fit based on DIN/ISO 286
  2. dvd

    Steel-to-Steel Fastening with total thickness greater than 1/2"

    If you could pre-punch / pre-drill one of the sheets and then use a self-drilling screw you could get a #5 drill point to work.
  3. dvd

    Shelf Support Steel Angle Fastened to Cold Form Exterior Stud for Brick Veneer

    What trade is installing the angle? Vertical uphill weld of 5/16" (or whatever thickness) angle to 16 ga seems chancy, especially if there is limited access. Bolting with field drilled holes seems pretty simple. If this was some mechanical gizmo I would lean that way.
  4. dvd

    seasonal above ground water line for farm use

    after searching on "bladder tank" and seeing what I refer to as a "pressure tank" I get a better concept. When I saw bladder tank I though it meant a bladder storage tank...
  5. dvd

    seasonal above ground water line for farm use

    A diagram would be helpful, but the cows may not be good at sketching. Why wouldn't you fill the small tank with a line tapped into the main tank and controlled with a float valve?
  6. dvd

    seasonal above ground water line for farm use

    You may be able to get some assistance with this project from your state USDA service center - https://www.nrcs.usda.gov/state-offices https://www.nrcs.usda.gov/sites/default/files/2022-09/stelprdb1167367-watering-facility.pdf
  7. dvd

    Unistrut in Torsion

    You might be able to cobble something together using Telestrut, which is a closed section and would be torsionally rigid. https://unistrutohio.com/products/p9000-1-5-8-x-1-5-8-telestrut-tubing
  8. dvd

    Fixed Speed Positive Displacement Blowers Running Speed

    I have never heard of this term - would appreciate some discussion.
  9. dvd

    Welding Heat

    My thoughts on this, which I have pondered before but not executed - CTE of concrete and steel are very similar, so plate expansion vs concrete expansion should match at an interface if the plate stays reasonably cool. Method to get some general idea of how hot the plate would get based on...
  10. dvd

    Shaft Failure in Translation Gear Reducer of Bucket Wheel – Need Help Identifying Cause

    It may be a matter of semantics, but I think the wheel shaft may likely be from a bucket wheel stacker/reclaimer, which runs on rails along a fixed path.
  11. dvd

    Shaft Failure in Translation Gear Reducer of Bucket Wheel – Need Help Identifying Cause

    https://www.eng-tips.com/threads/failed-splined-shaft-interesting-fracture-zone.393758/
  12. dvd

    Shaft Failure in Translation Gear Reducer of Bucket Wheel – Need Help Identifying Cause

    uniformly dividing a 400 ton load over 16 wheels seems optimistic. a misaligned wheel may be taking a lot more of the load. please provide bearing locations and wheel load location on the shaft shown above and several sketches of the equipment.
  13. dvd

    Hole size for PVC fire gear dryer

    You might consider approaching you nearest engineering school and discussing this with a mechanical engineering professor. It might make a good project that the students could solve and apply some engineering theory to. How did you decide on the blower size? It seems like you should start at...
  14. dvd

    Belts, rollers, rods and frame

    If you can describe it with words and not give away the secrets, you could come up with a sketch of your written image - maybe you'll even answer your own question.
  15. dvd

    Cold Formed Joists

    Depending on which route you go, North American Specification for the Design of Cold-Formed Steel Structural Members, AISI S100, Chapter J may be of interest.
  16. dvd

    Techniques to enforce nearly uniform flow velocity in a rectangular duct

    You could buy/make a flow straightener - https://www.ruskin.com/model/as100 You could insert a diffuser panel - I have made such with this type of grating with embossed holes (extruded collar pointing downstream) - https://www.mcnichols.com/plank-grating/plank/carbon-steel-cs-mc12201m An array...
  17. dvd

    Techniques to enforce nearly uniform flow velocity in a rectangular duct

    Post a sketch of your arrangement, please, to assure that you are describing to others what you see yourself. Identify and quantify flows, duct size, tray size, tray spacing, etc.
  18. dvd

    Shaft can't fit in the hole.

    What were the actual sizes of received parts? H7/h6 could have been a size-on-size fit, which I would not expect to go. If the saddle was machined after the 10mm hole was bored, there may have been some residual stresses relieved and the hole went out of round - what material was used? Are you...
  19. dvd

    Clearance Recommendation

    My thought process on how to approach this would be to decide on pin diameter, considering, among other things pressure and velocity of pin surface on bearing material. The attached information from Bunting Bearing may be of use. A different approach would be to calculate contact stresses.
  20. dvd

    gear pin mechanism

    Nexen also has a variation on this. I think that it could be possible to engineer the components, but not sure why. If you are going to produce these and compete in the market, you would already have this knowledge, and the time involved to engineer for a single usage doesn't seem justified...

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