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  • Users: erik3000
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  1. erik3000

    Generate curve from path of a point on mechanism

    Is it possible to create a curve from the path of a specified point on a link within motion application? A simple example would be to display the coupler curve of a four-bar linkage: https://www.youtube.com/watch?v=rjxnoQz4xDs I've tried two ways to at least get a visual display after running...
  2. erik3000

    Motion Simulation Error: cannot open any saved simulations

    I have a large assembly motion model, which has multiple saved simulations. Suddenly, when I enter the Motion application, and double click on a simulation to enter, I get the following error: "Error occurred during display of part Modeler error: object is not of type expected" Also attached...
  3. erik3000

    Sketch Line Colors -- colors not showing sometimes when out of sketch

    I've noticed that if I color the lines within a sketch, that when I exit the sketch, sometimes the colors are still showing and other times not (all just gray). What determines if the colors still show or not?
  4. erik3000

    Tips on kinematic synthesis in 3D using sketch/constraints or other tools?

    This is a somewhat non-specific question, I'm looking for discussion on different methods for doing kinematic layouts (linkage design) in 3D, since generally everyone will develop their own unique variation of techniques. If you are experienced with kinematics and specifically using sketch...
  5. erik3000

    Motion simulation not animating in multiple viewports

    Using NX11. I'm attempting to set up a simulation with multiple viewports, i.e. using the layout that divides the screen into four quadrants, and in each viewport the camera is zoomed in on a particular part of the assembly. No issues setting it up, but when I play the animation, only the...
  6. erik3000

    Datum precedence for two single segment location tolerance

    I know that on a composite feature control frame, the feature relating (second row) tolerance must have the same datum precedence as the pattern locating (first row) tolerance. Is this the case also for two separate single segment controls applied to a feature? e.g., could I have an FCF...
  7. erik3000

    Control the angle of a theoretical line between two holes relative to a mating part on assembly

    Please see the attached image. The green part comes in with two holes which are controlled relative to each other. It mates to the blue part so that the big hole is some distance from datum A (loose tolerance), and the green part is clocked so that the angle of the red line relative to datum A...
  8. erik3000

    Curved slot continuous feature

    Looking for the most practical way to call out the feature described below for machining. Imagine a clevis with a slotted hole roughly like this: https://files.engineering.com/getfile.aspx?folder=e19aadde-1bb1-487d-9090-599f69d2ea4f&file=slotted_clevis.jpg Except with a curved (constant...
  9. erik3000

    Serrated plate for indexing of fittings

    Trying to gather information on the use of shims/plates with serrations that are used to adjust position of attachment fittings to structure(e.g. hinges, lugs, latch brackets, ...). I.e. the interfacing surface of both a fitting and mating structure are serrated, such that the fitting can be...
  10. erik3000

    Automatically articulate sketch and record measurements

    [NX 10] I have a fully constrained kinematic sketch with one input dimension. Is there a way to vary that dimension, maybe with an expression, so that it steps through each value and a corresponding reference dimension is automatically measured and tabulated against each input value? The...
  11. erik3000

    Any way to make the 'Window' drop-down list of recently displayed parts longer?

    I'm using NX 10. I often work with huge assemblies with dozens of sub-assemblies and hundreds of parts. The Window tab allows you to switch back to recently open parts/assys, but it's limited to 10 items. Is there any way to increase this? Either in options or by simple modification to code? I...
  12. erik3000

    Modeling roller chain on a specific path

    Is there any fast way to do this? I want to model a length of ANSI roller chain between two sprockets -- I can only think of doing it by modeling the individual links then constraining them together, or making a 2D sketch of the chain links, both grueling procedures. Is there a simple way to...
  13. erik3000

    Small, powerful linear actuator with short stroke

    I am looking for a linear actuator that has a short stroke (1 to 2 inches) and can put out around 500 lbs. Ideally it would be a discrete 2 position device but not necessary. Non-hydraulic and no squibs. I've looked at screw type actuators but they are mostly unnecessarily long for what I need...
  14. erik3000

    Need a flexible shaft coupling for submerged seawater application

    Similar to those shown here: https://heli-cal.com/cm/Products/Flexible-Couplings/Home.html However these do not meet torque requirement: 400 in-lb in both directions. Shafts are both 3/4" with standard keyways. I understand that 17-4PH stainless is a good material choice. Most similar...
  15. erik3000

    Tapped threads and threaded inserts in glass reinforced PEI (Ultem 2300)

    I am planning to build a part out of Ultem 2300, also called Duratron, which is a glass fiber filled polyetherimide. It will be made from 4" thick stock sheet. I plan to use threaded inserts in this material, which require tapping. What I can't find is any literature or specifications which...
  16. erik3000

    Bearings for immersion in seawater

    What kind of bearings would be best for salt water environment, specifically spherical bearings? I'm thinking stainless plain bearings. What do you think?
  17. erik3000

    Machinable non-conductive structural material recommendations

    Looking for a material to use for a structural component of dimensions roughly 5x5x5" Hard brittle plastics are out do to bending loads. Wood too fibrous, plus it may get wet. - Must be machinable - Rigid - Electrically non-conductive - The more isotropic the better - Can support tapped...
  18. erik3000

    Gear speed multiplier for pump

    I have an unusual situation where I am trying to run a pump manually with a mechanical device that is very slow (40 RPM max) but high torque (1500 in-lbs), while the pump should be run closer to 1500 RPM and 100 in-lbs torque. Most gearheads seem to be made to reduce high speed motors, while...
  19. erik3000

    Bi-directional pump via reversible rotary input

    Do these exist? Basically I'm looking for a pump that will flow one way when you spin the shaft CW and another when you spin it CCW, at similar pressure both directions. This is for a hydraulic actuator application, 200 psi max. (spin the pump CW-- actuator extends, spin pump CCW-- cylinder...
  20. erik3000

    How to constrain pin-in-slot assembly?

    I have a link with a straight slot (semi-circle ends) and a cylindrical pin that I want to slide along, but not beyond the ends of the slot. Once the pin reaches the end of the slot I want it to move the slotted part. I've not figured out how to do this with Assembly Constraints. Is it possible...

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