Here is a reference http://machinedesign.com/mechanical-drives/self-locking-worm-gears-fact-or-fiction(and more or less the same thing is found else where),
"All theoretical analyses of self-locking worm gears deal with static conditions. In such an analysis, the load on the worm gear can’t...
As i mentioned the theory suggests other wise. As per the literature, if the friction angle is greater than the lead angle the system is self locking which normally occurs with a lead angle of 5 degree. Can you explain your comment a bit in the ligh tof this theory?
Apologise for not correctly indicating the worm mesh. Both planes are parallel (worm and worm gear) as they should be, which means that the axis of the wheel is perpendicular to the axxis of the worm gear. I tried to resketch the case.
Hi,
Thanks a lot for replying. Please have a look at the image. The load (40 kg) is applied at the end of the lever which is 300 mm in length but the input worm gear does not rotate even then. The theory suggests that the back drive is more linked to the lead angle and as such not related to the...
Hi
I have built a gear drive for robotic arm that uses a worm set (worm gear +worm) at stage one. Worm (wheel) is of bronze and worm gear is steel haing a lead angle of appx 8 deg. This set is further coupled to a spur gear set that further increases the torque such that the over all gear ratio...