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  • Users: loughnane
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  1. loughnane

    dimension ID's on drawing

    I'm setting up drawing standards and think I will have utility for attaching a dimension ID to each drawing on a print. By this I mean literally every dimension on the drawing will have an ID number. I have several downstream reasons for this, but the underlying principle is that if it is worth...
  2. loughnane

    a locking ring for the back of a watch

    Does anyone know where I can buy a locking ring similar to the one shown at ~1:20 in this video...http://youtu.be/M_dq-Ak-Suw?t=1m22s? Alternatively, how would you guess this is manufactured? Forged then machined? Chris Loughnane - Product Design http://www.pdnotebook.com...
  3. loughnane

    Stepper motor running continuously?

    I was looking to by a ball-screw driven linear drive module from Oriental and was told that their stepper motors are not recommended to run continuously. Considering my application was a back-and-forth motion with a period of ~1s and no rest, this was concerning. I have never heard of such a...
  4. loughnane

    designing "quick-grip"-like mechanism

    I've always referred to it as a monkeybite...http://www.northerntool.com/images/product/images/189634_lg.jpg I am having a tough time finding any literature on the mechanism (i.e. req'd material stiffness, hardness, etc.) Does anyone have any experience designing something similar or can at...
  5. loughnane

    locking ball and socket joints

    I'm trying to source a ball and socket joint for a prototype. I'm thinking something along the lines of what you might see on a camera positioning arm, but able to be locked such that it can resist moments of ~100-200 in-lbs. I'm having a tough time sourcing something like this (or even finding...
  6. loughnane

    tolerances for polyurethane foam

    I'm looking for rough tolerance estimates for a polyurethane foam part. It's about 11" long by 4" wide by 1", and I'm looking for a tolerance on the 11" dimension. 0.050? 0.060? I'm not looking for an authoritative answer ( I know it varies), but more a collection of gut feels. I am developing...
  7. loughnane

    amorphous or semi-crystalline polymers for creep resistance?

    I have multiple resources telling me how good Nylon and Acetal are for creep-resistance, but then a few other resources telling me that amorphous polymers are generally better for creep-resistance. I suppose that conflict could be explained away by the word 'generally', but it seems tough to...
  8. loughnane

    (shear + tensile)/peel ratio

    Lets say I have a wall of plastic. On this wall I have bonded a piece of natural rubber. This rubber is going to see several hundred pounds of compression several hundred pounds of shear. More importantly, this rubber is going to see an insignificant amount of peel. The question is, what kind...
  9. loughnane

    rubber as a pressure barrier

    I'm looking for information regarding using different grades of rubber as a barrier over a pressure differential. I'm thinking of it being used in an autoclave, so we're talking a bout a 20/30 psi differential @ ~120c for 20-60 minutes. I feel like I'm reaching into an academic realm, but...
  10. loughnane

    show crosshairs even if not dimensioning to them?

    For example, I have a top view where I dimension the location of a thru hole. That view has crosshairs Two projection views later I have a bottom view. I can now see the other end of the thru hole, but I am not dimensioning to it (to prevent overconstraint). Is it correct to show the...
  11. loughnane

    recycling resins with filler

    How involved does recycling resins with filler become? The specific instance where this came up was calcium carbonate-filled polypropylene, but I'm also intrigued in more conventional fillers such as glass. for that matter, what about blended thermoplastics (PC/ABS, PC/PBT, etc.) ..looking...
  12. loughnane

    side action parting line question

    Is it possible to create the part shown using a side action where the highlighted red line is the witness line left from the side action? The purpose is to avoid having the parting line be at the extents of the face. (obviously not the real part, but it's representative enough) Chris...
  13. loughnane

    what is this coating

    Came across this set of knives and I'm trying to figure out the what the coating is (http://www.stelton.com/ProductView.aspx?id=453) specs: material: forged stainless steel special coating is easy to clean and hygienic soft matte black coating has superb grip FDA approved I did a little bit of...
  14. loughnane

    overmolding a rigid plastic onto metal

    I'm looking for some resources on overmolding a rigid plastic onto metal. It seems like all the good design guides out there focus exclusively on overmoldign TPE onto metal or rigid plastic. Anyone have anything good they can point me towards? Chris Loughnane - Product Design...
  15. loughnane

    spec for machining tolerances

    I'm looking for a spec for standard machining tolerances for different processes. I found ANSI b4.1, but it looks as though it is only dealing with cylindrical fits (even though I see other websites using it as a reference for positional tolerances). So is ANSI B4.1 the best out there, or is...
  16. loughnane

    Anodizing aluminum weld

    I'm working on a concept that involves welding some aluminum plate to aluminum tubing (something like the attached. The concern I've got is that I am going to be hard anodizing the assembly once it's all said and done. I've done some digging and found cautions regarding minor discoloration...
  17. loughnane

    Autoclavable press fits.

    I've used press fits (pins in hex holes) to snap plastic clamshells together a few times, and been around others who have done it dozens. It works like a charm and you are liable to break the plastic body before the pins will come out of the holes. My questions is, has anyone had any...
  18. loughnane

    3 shafts in 3 holes Tolerance Analysis

    I'm writing some TA code and am having a tough time wrapping my mind around the math for the following. I've got a plate. On this plate I have 3 holes (.130 dia) in a row, with 1" between each hole. I've got another plate. On this plate I have 3 shafts (.125 dia) in a row, with 1" between...
  19. loughnane

    convert linear force to radial force for compression with O-Ring

    I'm using an O-ring as a belt (not a drive belt, like a waist belt), and I want to determine the compressive force that I am applying to the mandrel (or "waist" if we want to stick with that terminology). I can easily take the length of the O-ring (if unraveled), the length (circumference) of...
  20. loughnane

    Standard tolerance scheme for lasercut stainless

    Looking at some suppliers I see people claiming plus/minus .003 to .005 on positional dimensions. The question I have is "for a lasercutting machine, is that over the entire part? For the first 6 inches? I'm working with a 16" wide sheetmetal part that mates to some plastic parts, and just...

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