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  1. loughnane

    dimension ID's on drawing

    @CheckerHater the product itself isn't mechanically unique, but I think there is enough value in the process to warrant the PITA identifying the dimensions is sure to be. Pardon me while I stand up on my soap box... Dimensions are about as fundamental a building block as you can get in...
  2. loughnane

    dimension ID's on drawing

    @drawoh My understanding is that if I delete dimension "X" and add dimenson "Y" that the SolidWorks-assigned dimension ID for dimension "Y" will be the same as the one for dimension "X". This would have negative implications for traceability. Perhaps I am missing some functionality? Chris...
  3. 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...
  4. 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...
  5. 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...
  6. 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...
  7. loughnane

    locking ball and socket joints

    Something like that. I had to get something by the end of the day so i could have it by monday for prototyping... so i just bought a manfrotto arm. Chris Loughnane - Product Design http://www.pdnotebook.com http://www.twitter.com/_chrisloughnane
  8. 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...
  9. loughnane

    tolerances for polyurethane foam

    @dvd good insight, much thanks. Chris Loughnane - Product Design http://www.pdnotebook.com http://www.twitter.com/_chrisloughnane
  10. loughnane

    tolerances for polyurethane foam

    yes, by 'tolerance' i meant the estimated tolerance that manufacturers recommend designers incorporate into the design to deal with the inherent variation in injection molding polyurethane foam. Chris Loughnane - Product Design http://www.pdnotebook.com http://www.twitter.com/_chrisloughnane
  11. 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...
  12. loughnane

    Round into Hex Interferance fit.

    I've used the 'bullet pin into hex hole' multiple times, and my general rule of thumb is that the diameter of the pin (~.100 - ~.200) should nominally be .005 larger than the width of the hex. I generally do this with some kind of PC blend. Practically I'll start @ a L2L fit, and encourage the...
  13. loughnane

    amorphous or semi-crystalline polymers for creep resistance?

    Many thanks Pat Chris Loughnane - Product Design http://www.pdnotebook.com http://www.twitter.com/_chrisloughnane
  14. 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...
  15. loughnane

    (shear + tensile)/peel ratio

    Thanks much, plenty to think about. Chris Loughnane - Product Design http://www.pdnotebook.com http://www.twitter.com/_chrisloughnane
  16. loughnane

    green thermoplastic material

    'Most common' doesn't have any relevance to whether or not it's 'green'. As to your point about the polymer encapsulating the carbon black, it's a good point. A little research shows that the FDA actually approves carbon black for some food applications as it deems it a carcinogen only in the...
  17. 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...
  18. loughnane

    green thermoplastic material

    If your concern is being green you may want to stay away from Carbon Black as it is recognized as a carcinogen. Chris Loughnane - Product Design http://www.pdnotebook.com http://www.twitter.com/_chrisloughnane
  19. loughnane

    Rubber Selection

    @tom1953 i stand corrected. Chris Loughnane - Product Design http://www.pdnotebook.com http://www.twitter.com/_chrisloughnane
  20. loughnane

    Rubber Selection

    the parker o-ring handbook has a good comparison chart of common rubber materials. As far as injection molding, most rubber's can't be injection molded in the true sense. They can be transfer molded, which is a bit different. Chris Loughnane - Product Design http://www.pdnotebook.com...

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