Dual counter thread

thingiverse

Dual counter thread I have placed this model for one reason, to show you the drive system of the jack I have made. 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 the start, this was more about the dual counter thread and not the jack. I think other people can use it as well, in some projects. That is the main reason why I place it here. The printed parts are a bit of a mixture of plastic brans colored is PLA, the reddish and black color are PETG. It shouldn't make a difference what you use. Assembly should be straightforward but keep in mind that the spacers need to be on both sides of the screw holder (see foto). Also, I have made a small hole in the screw left hand and screw holder left to make it easier to distinguish one and the other. I still will add the part list even IF some going to make it. none printed parts: * Wasser 8X * M3x25 bolt 16X * M5x30 bolt 8X(12X if between spacer used on top part) * M5x15 bolt 4X * M5x25 bolt 4X (if between spacer NOT used on top part) * M5 nut 8X (4X if between spacer used on top part) * switch 1X * stepper driver 1X * power supply 1X * Raspberry pi 3(other boards will also work fine) 1X * NEMA 17 dual rode heigh 40cm heigh 1X 3D printed parts: * Nemaholder Nr1 1X * Nemaholder Nr2 1X * between spacer 2X(4X used on top part) * screw right hand 1X * screw left hand 1X * scissor 8X * screw holder right 1X * screw holder left 1X * side bottom 2X * spacer 6x(8X if between spacer used on top) * top beam 2X * top side 2X