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  1. Are Delrin Composite gears in motors as good as metal gears?

    Hello, assuming that everything of the three motors are the same except that the gears are made of different materials. The first one is made of Delrin composite gears, the second one is made of...
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    Static load of linear actuator

    Hello, I measured an object using an electric scale. It is 5kg. I want to select a linear actuator such that when placed vertically, it can keep the object on hold at a fixed height. In this case,...
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    I need to create a model so that the computer...

    I need to create a model so that the computer simulated motor behaves like the real one. I was told that manufacturer cannot provide the inductance information.
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    Thanks. I am trying to save some money. I...

    Thanks. I am trying to save some money. I checked the reviews but it seems that some could not give accurate measurement values. Which one do you recommend?

    How inductance affect the motor...
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    Measuring DC motor inductance

    Hello, on the internet, there are various methods on measuring the inductance. For example,

    http://www.dos4ever.com/inductor/inductor.html and...
  6. Thanks for pointing out the design issues.

    Thanks for pointing out the design issues.
  7. Thank you. What is FOS? From the table, the...

    Thank you. What is FOS? From the table, the coefficients vary a lot. For example:

    Aluminum - Aluminium: 1.1-1.35
    Brass - Steel: 0.5
    Bass - Cast Iron: 0.28

    Do you mean try to set the...
  8. Thanks. I think the "lead angle" mentioned in...

    Thanks. I think the "lead angle" mentioned in this link is the one I talked about. So, according to the equation, it will be
    atan(1.25/8pi) = 2.85 degrees?

    The store in Japan told me that the...
  9. Haven't heard from the company yet. Here is a...

    Haven't heard from the company yet. Here is a photo of the power screw I am trying to model.

    http://www.engineersedge.com/engineering-forum/attachment.php?attachmentid=1875&stc=1
  10. Thanks Kelly and jboggs. I sent an email to the...

    Thanks Kelly and jboggs. I sent an email to the company asking them about the screw. Still waiting for their reply. I will post once I have heard from them. Thank you.
  11. I am trying to model the self locking behavior of...

    I am trying to model the self locking behavior of this M8x1.25 thread in computer simulation. To do that, I need to obtain the following parameters:

    a) Coefficient of Kinetic Friction
    b)...
  12. Thanks Kelly. From the image included in the...

    Thanks Kelly. From the image included in the website you cited and the one below, how to obtain the lead angle from the thread angle?


    As for the pitch diameter, should I choose 7.16 (max G0) or...
  13. Perhaps I don't know how to read the table....

    Perhaps I don't know how to read the table. Probably effective diameter of thread and either the lead or the pitch and number of threads are the controlling specifications.

    The number of threads...
  14. Thanks for the table but I don't seem to find the...

    Thanks for the table but I don't seem to find the parameters I am looking for.
  15. Clarification on Power screw's specifications please

    Hello, I have a power screw. According to the specifications, it is M8x1.25. Does that mean the effective diameter of the thread is 8 mm while the pitch is 1.25 mm? Is the screw radius just 4mm?
    ...
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    I went through these two papers. I have a few...

    I went through these two papers. I have a few questions from "Mathematical Analysis of Actuator Forces in a Scissor Lift".

    In the Introduction, the author mentioned that the paper is to present...
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    Equations for two stages scissor jack

    Hello, I have a two stages scissor jack likes the one shown in the photo but with the addition that a DC motor is connected to the knob. Could anybody please show me how to obtain the dynamics...
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