Dual counter thread by morowlegacy

Last crawled date: 2 years, 10 months ago

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