Recent content by Owen Ransen

  1. O

    Undergrad How does Jupiter protect the Earth from collision with space rocks?

    I read (in "The View From The Center") that Jupiter protects the Earth from collision with large space rocks, asteroids, etc. What I can't get out of my mind is that could it also cause collisions. A large rock (initially not heading for Earth) could be put on a different path by Jupiter's...
  2. O

    The torque (and stalling torque) of a servo motor

    Thanks Tom for the suggestions. The actual system works very very well, and is very flexible about speed, angle etc. It is just the motors which break. What I'm going to do now is rejig mechanism to reduce the torque by 50% by using a shorter arm...
  3. O

    The torque (and stalling torque) of a servo motor

    I did read the reviews but took a chance. Some worked well, but not for very long. Then I got one which cost 10x the price and it did not last much longer than the best cheap one.
  4. O

    The torque (and stalling torque) of a servo motor

    Thanks for the idea, but I moved to this system because simply dropping the pen splatters the ink and damages the nib (on this home made system).
  5. O

    The torque (and stalling torque) of a servo motor

    The photo does not show well the arrangement, I don't think the length of the pen comes into, here's a clearer image:
  6. O

    The torque (and stalling torque) of a servo motor

    Thanks, you've given me something to think about. However, does that mean that the specs of the servo on amazon I posted are completely wrong?
  7. O

    The torque (and stalling torque) of a servo motor

    I'm using a servo to lift a pen. The pen and a bit of mechanism weights 35g. The servo I use to bring the pen up and down claims to have a torsional moment of 1.5kg/cm. Sometimes they call it torque in the specs. But surely that does not mean they are claiming that if I hung a 1.5kg weight a 1...