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  1. hobbs101

    GD&T for centreline positioning?

    Yes, understood. I currently don't use MMC modifiers in any of my work. I need to learn about it and start using it if applicable in designs. Thanks everyone for all the help. Hobbs101 Mechanical Design Engineer
  2. hobbs101

    GD&T for centreline positioning?

    How about this? Hobbs101 Mechanical Design Engineerhttp://files.engineering.com/getfile.aspx?folder=6431f715-b83e-4d5a-8928-8a21fb7ea69d&file=snip_20160914131616.jpg
  3. hobbs101

    GD&T for centreline positioning?

    Hi all. Sorry for the lack of input. Kenat is correct, I'm asking for positioned centrally and oriented correctly. The JonSelby example does not position it centrally. The 300 dimns could be +/-10mm. I like the Belanger example. I think this is pretty much what I'm after. See attached for my...
  4. hobbs101

    GD&T for centreline positioning?

    As far as I understand, my drawing positions the hole pattern (not specifically the holes, but the complete hole pattern) on the centre lines of the plate. On second thoughts, I'm not sure my drawing is correct. What's saying that the hole pattern centre should be on the centrelines? What I'm...
  5. hobbs101

    GD&T for centreline positioning?

    Do mean as the attached? Hobbs101 Mechanical Design Engineerhttp://files.engineering.com/getfile.aspx?folder=fee7b1e5-1289-4b72-a105-79bfed4897fb&file=snip_20160909172316.jpg
  6. hobbs101

    GD&T for centreline positioning?

    Hi. I have a plain square plate of unknown exact size and I want to ensure that 4 holes on a 100x100 square pattern are positioned centrally and oriented correctly. How is this dimensioned/toleranced? I've seen many drawings where plate centrelines will be marked and =100= dimensions are put...
  7. hobbs101

    forklift pockets

    I'm modifying an existing framework to be lifted by a forklift. The framework weighs 2000kg and is 4m x 4m footprint by 2m height, so it's quite a wide load. Centre of mass is central and is 0.7m height. We'll be using a large forklift (versalift) with ample capacity and fork length to lift...
  8. hobbs101

    Best material for anti-galling on aluminium thread?

    Thanks all for your help. I'm using brass. The ally threads won't be anodised. I understand with hard anodise the anodise build up is generally half of the anodise thickness. Hobbs101 Mechanical Design Engineer
  9. hobbs101

    Project shadow of object onto surface?

    The reason I need to do this is because I'm designing a lead mask for an x-ray machine. The mask sits behind the cone object. Ideally the mask would be a perfect cutout, blocking all the rays (emitted from a point source) outside the perimeter of the object. I know there will be other...
  10. hobbs101

    Project shadow of object onto surface?

    Hi. I need to project the 'shadow' of an object from a point source of light onto a flat surface. This object is a cone, but could be more complex. Any thoughts on how this might be achieved? Hobbs101 Mechanical Design Engineer
  11. hobbs101

    Best material for anti-galling on aluminium thread?

    Hi. I've got an M40x1 threaded hole in a 12mm plate of aluminium alloy (6082-T6). An threaded adjuster bar sits in the hole. What's the best material to make the bar out of to prevent galling? I'm thinking brass, bronze or aluminium bronze. I am also able to use lubricant e.g. grease. Hobbs101...
  12. hobbs101

    bead blasting for aluminium

    Hi. I'm intending to get a welded aluminium assembly bead blasted to remove blemishes and give a satin finish. I understand glass beads are best for aluminium. I'm looking for a 'fine smooth finish'. Can anyone recommend a typical bead size to achieve this? Or, I can specify a surface roughness...
  13. hobbs101

    hole thru into section - correct drawing note?

    When I say 'to my mind it's clear' I mean I think it's clear to everyone! But, yes, I accept your points. Clarity can save many subsequent issues. In fact, I do have one instance where my adopted terminology isn't clear, so I have indeed put in a section :-). Hobbs101 Mechanical Design Engineer
  14. hobbs101

    hole thru into section - correct drawing note?

    Kenat, I agree that generally a section would be the clearest. In my current case sections are not the most practical. I have a complicated fabrication with many holes. To my mind me using 'M6 THRU PLATE AND ONE WALL' and 'M6 THRU PLATE AND TWO WALLS' is clear. Hobbs101 Mechanical Design Engineer
  15. hobbs101

    hole thru into section - correct drawing note?

    Thanks. One day I'll learn to search the forums before posting!! I'm going to adopt the 'one wall' terminology. Seems clear to me. Hobbs101 Mechanical Design Engineer
  16. hobbs101

    hole thru into section - correct drawing note?

    Hi. If I have a plate and with a hole through the plate, I put on the drawing 'M6 THRU'. That's clear. But, if I have a box section and I want the hole to just go through the wall of the box section, what is the standard notation? I've previously stated 'M6 THRU SECTION WALL', but that sounds a...
  17. hobbs101

    problems with iparts

    Hi. I've not been using iparts for long and am realising that they might be more trouble than they are worth! So, I've got a family of shafts, 4 off, identical other than lengths. I've converted the part to an ipart and set the lengths accordingly. I've put the iparts into my assembly. All is...
  18. hobbs101

    affect of torque on critical buckling of shaft?

    Thanks, I'll have a read through. Hobbs101 Mechanical Design Engineer
  19. hobbs101

    affect of torque on critical buckling of shaft?

    Thanks desertfox, but I don't see any reference to combined compression and torsion in that document. Have I missed it? Hobbs101 Mechanical Design Engineer
  20. hobbs101

    affect of torque on critical buckling of shaft?

    Ah yes, that look good. Thanks. Hobbs101 Mechanical Design Engineer

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