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  1. ggarnier

    Fluid velocity limit

    I am looking for a fitting similar to that used on automobile A/C compressors. It consists of the tube itself, which is a close fit in a deep (~2XD) smooth bore in the compressor casting, and a tab (probably brazed onto the tube) that has one screw hole. I am trying to increase flow capacity in...
  2. ggarnier

    Backpressure on domestic heating/cooling systems

    Thanks for all the info on this - it's precisely because I'm not an HVAC person (although ME by training, and a little hands-on) that I addressed my inquiry to this forum. What I may have overlooked is a more direct solution, ironically close at hand: direct measurement of an appropriate...
  3. ggarnier

    Backpressure on domestic heating/cooling systems

    I am familiar with the concept that it is risky to close too many room outlets in a house in an attempt to concentrate heating/cooling effects where the people are. Now that I am living in a house with a seriously under-sized furnace/AC, I'd really like to be able to do this, but without...
  4. ggarnier

    Unbalanced part size in family mold

    Thanks to "Ornery" for your reply. Assuming that this "static balance" can be achieved (or that the parts are so small it is not really an issue), are there other problems, like difficulty getting complete fill on all parts? Or excessive cycle times? Or cosmetic issues...
  5. ggarnier

    Unbalanced part size in family mold

    Sorry - as Lily Tomlin said: "I should have been more specific". Injection molding common resins (ABS or Polycarbonate) was the context of my original question.
  6. ggarnier

    Unbalanced part size in family mold

    Over the years I accepted on faith that trying to have parts of quite different size/geometry together in a family mold is a bad thing. Recently I began to wonder "Why?". Which part suffers? (The big one/little one/both?) In what way do problems manifest themselves? The most obvious...
  7. ggarnier

    Looking for an equipment maker

    As was mentioned by "pardal", the laser is just an aiming aid, and its use is optional (operator energized or ignored). Most IR thermometers don't have them anyway. If your rollers are large, you don't need a the functionality laser pointer. Take a look at www.raytek.com. Ircon...
  8. ggarnier

    Looking for an equipment maker

    "We can't use a laser thermometer in the area." If you mean infrared, I am curious about why you can't use IR. (Full disclosure: I'm a design engineer at an IR thermometer company.) Unless there is absolutely no room for a small cylindrical IR sensor, the moving roller situation is...
  9. ggarnier

    Jam Jar Lids

    After sending my first post, I tried Google; I don't know about the size, but I think this is close - jump to end to see name of current mfgr, and by all means let me know if this is what you were looking for: "A Source for Hard to Find Lids Phyllis Flanigan asked where her client could...
  10. ggarnier

    Jam Jar Lids

    "Ball" is the brand I remember from my childhood for the flat lids and sealing rings. The logo is (was?) identical to that of Ball Aerospace, I believe (old style script rsing to the right) so maybe it is the same company. Hope that gives you something to go on. Good luck
  11. ggarnier

    Part numbers vs. Drawing numbers

    If I have a drawing numbered 12345, then even if there is no possibility that there will ever be variants of this part (i.e. dash numbers), the part is entered in the MRP system as 12345-1. So in this sense, the drawing and part numbers are different. Providing for the possibility of variants...
  12. ggarnier

    Splined Shaft Design

    Have you looked at a company called (I'm working from memory here) Stoffel Polygon Systems? They apparently either have a patent or a capability lock on a system using a rounded triangular male/female system instead of the classic splined shaft. I don't do power transmission at all, so I have...
  13. ggarnier

    Fineblanking in a tube wall

    I am designing a bayonet joint between two pieces, like an automotive taillight bulb/socket, except "inside-out". That is, the pins are in the "socket", engaging features machined into the "base of the bulb". In the past I have used pressed-in dowel pins in the...
  14. ggarnier

    Torque vs. clamping force

    Thanks, PK - If I may reiterate: For constant F, the torque required to produce that force increases with fastener size. Another way of stating this: increasing fastener size will make it more (not less) difficult to generate by hand the torque required to produce a specific axial force.
  15. ggarnier

    Hairpin clip design source needed

    Mark, I'm afraid the predictability and/or repeatability of the release force would not be very good. Greatly dependent upon groove depth/radius and any chamfer or radius at the edge of the groove. Also, wear (both on hairpin and at the edge of the groove) over a number of release cycles would...
  16. ggarnier

    Torque vs. clamping force

    Is there any place to find data on fastener torque vs. clamping force? Specifically (I'm embarassed not to have an intuitive grasp of this) if I get P# force with a fastener of one size at T ft-# torque, will I need more (or less) torque with a larger fastener to get the same P clamping force...
  17. ggarnier

    Forcing a curved beam flat against a rigid surface

    I haven't worked through the equations for this (just got the fax today. Roark doesn't address this directly, but it does deal with a curved beam having a non-uniform load (2nd order) along its length - by playing with coefficients, I hope I can come up with a loaded condition close to what my...
  18. ggarnier

    Forcing a curved beam flat against a rigid surface

    Thanks for the replies on this. Most helpful was a fax (from Australia!) with pages from Roark - while it is true that the exact case is not solved in Roark, there are equations I can use, and most importantly, I decided I should get my own copy.<br><br>Thanks again.
  19. ggarnier

    Forcing a curved beam flat against a rigid surface

    Now you have it. No need to restate, just to add that I need to know the distribution of forces along the underside of the beam as well as the two forces at A & B. Intuition tells me that it will not be uniform, but if not, then what?<br><br>Thanks,<br><br>Gary Garnier<br>
  20. ggarnier

    Forcing a curved beam flat against a rigid surface

    My intent is to use this part as a clamp, not exceeding the elastic limit in use (imagine the &quot;rigid surface&quot; as the part being clamped). The preformed radius is intended to concentrate more of the reaction force in the center of the span of this &quot;beam&quot;.<br><br>While your...

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