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Recent content by Joel_Lapointe

  1. Joel_Lapointe

    Polymer maximum "service" temperature

    I'm mechanical engineer, so the topic of material definition pertaining to polymers isn't my best. I'm searching the maximum "service" temperature of a few polymers and elastomers on Campus plastics and Matweb. Some compounds have a clear "service" temperature window other not. So my questions...
  2. Joel_Lapointe

    Sealing documentation over groove specification?

    I just saw a file : https://practicalmaintenance.net/wp-content/uploads/Working-Design-Considerations-and-Maintenance-of-O-rings.pdf. It says the following : So this adds to my willingness to get access to "standard" practices for quadrings.
  3. Joel_Lapointe

    Sealing documentation over groove specification?

    Hi, We currently have a x-ring (quadring) seal that leaks. The application is an automotive actuator for offroad vehicles (ATVs...). As it is a x-ring (quadring), design documentation is more sparse than for o'rings. I try to get justification over dimensional tolerances on grooves for those...
  4. Joel_Lapointe

    Small dc brushed electrical motor format "280"?

    Well, Would be pretty much big for a small brushed 12V dc motor for automotive door locker and/or appliance motor! Is there a different standard for these small motors?
  5. Joel_Lapointe

    Small dc brushed electrical motor format "280"?

    I'm searching over the Internet a type of small DC brushed motors. I came to the conclusion that there is a standard for naming these. However, I don't find the original source of this standard. Different manufacturers are naming these motors with the number "280" placed withing other...
  6. Joel_Lapointe

    Classification of peroxide silicone sealant?

    I'm attempting to do a document to explain myself and my collegues the classification of silicone sealants. What I saw over internet is that most of the time, the classification goes like that: Acetoxy silicone (condensation cure + humidity + organic tin catalyst) Alcoxy silicone (condensation...
  7. Joel_Lapointe

    Automotive overmolded connector sealing

    Hi, We have an automotive mechatronic actuator product that contains some overmolded electrical pins that forms a connector. This PBT enclosure must be IP67. Despite the pins being overmolded, there is sealing issues. An example is that some automotive oil is running in electrical wires between...
  8. Joel_Lapointe

    Attribute gage r&r

    Hi! I have no experience into gage r&r for attribute gage validation (new engineer in training). So we have gages that are measuring a dimension with 3 attributes : to small, good and to big. I'm tasked to qualify those gages with a gage r&r process from AIAG MSA. According to our quality...
  9. Joel_Lapointe

    Cylindrical coordinate system shear stresses for SolidWorks Simulation?

    I have a simple axisymetric part with a torque load. SolidWorks Simulation gives the choice to get the shear stresses in the usual x, y and z coordinates system. I didn't find a way to get the angular shear stress? Is there a way to get shears in the cylindrical coordinate system?
  10. Joel_Lapointe

    Bad drawing conversion (hole pattern asymetric position)

    I've put zero because I need to change it accordingly...
  11. Joel_Lapointe

    Bad drawing conversion (hole pattern asymetric position)

    drawoh, Good Idea! Thank you...
  12. Joel_Lapointe

    Bad drawing conversion (hole pattern asymetric position)

    Currently working on a part mod. I want to convert the current drawing to proper GD&T standards. So, a 6 holes pattern of 6mm H7 is positioned on a pitch circle of 25.78 which has asymetrical tolerance. So, I want to convert this asymetrical tolerance of (+0.012, -0.006) mm to a position...
  13. Joel_Lapointe

    Equations in forum threads (MathML)?

    Unless I'm unaware of it, I don't see any way to include equations within the threads. I resort to put images with equations in them. As an engineering forum, it is unfortunate. Is there a way to push "MathML" in the interface? Is there a forum for "user suggestions" so people can post suggestions?
  14. Joel_Lapointe

    Signed von Mises stress when the sign is "zero"

    I have a stress state that gives a sign of zero for the signed von Mises stress. According to most of the literature, the sign is coming from the first invariant I1 of the stress tensor (Hydrostatic stress): For the general stress state the invariants are : For the principal stresses the...
  15. Joel_Lapointe

    Get fatigue the notch factor for non standard geometry?

    We have an aluminium die casting housing that receives some machining. From time to time, the machining is notching a wall. A hole is produced so 2 empty volumes are communicating. Since all of this is sealed with 2 shaft seals and a cover, we may accept that hole as is. However, we aim to make...
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