Dual counter thread

Dual counter thread

I have placed this model for one reason, to show you the drive system of the jack I have made( THIS IS PROFE OF CONCEPT, sub optimal at best). The jack itself is far from perfect the jack was made for a project but, I will not use it because of some other complications white that project.

The dual counter thread was an idea I had a couple of years ago and, I finally made use of it. I search on the internet to find if this kind of mechanism already exists but could not find it. ( I really doubt that it doesn't already exist).

I used a TR 16x4 (ISO Trapezoidal thread) counter-clockwise and clockwise. I didn't use any lubrication. So, that may be one of the reasons it's a bit shaky. I wish it isn't the one reason. However, some other complications like the scissors are too thin, the top can move when not at max height, and the screw holders flex a bit or the flat side of the thread is the problem, as you probably can see in the youtube video.


But as I told you at