Cut stationary leadscrew - 3D printed boogaloo edition

File: Threaded_Rod.png (31KB, 324x234px) Image search: [Google]

31KB, 324x234px

Pic is of the threaded rod we are using right now, the custom CNC job.

2- Is it possible to 3D print the whole screw setup?

We will have a pressure of about 3 bar inside the column, so about 60kg on the hypothetical plastic screw,

By the way, how is this called?

I have tried looking for "stationary leadscrew" or "cut static thread"

>There is only one cut area, so when you change directions, there is some backslash.
What does the "flat" have to do with backlash?
1)Is the rod still turning a bit?
Are you turning it by hand by hand or is there some other reason you need to reduce backlash? 2)Why is the backlash a problem?
3)Why not use a guide rod or two like cnc linear drives?

An actual pic of the setup or an explanition of the purpose would be helpful.

File: Nut_for_Threaded_Rod.png (75KB, 367x378px) Image search: [Google]

75KB, 367x378px

>>1141199
The rode is this one
>>1141183

- The backslash is not that important, so one flat area maybe enough. You are right.

- The rod works pretty well, but it is sometimes a bitch to turn. An acme or trapezoidal threading is however most likely a better alternative. Except that I do not know if the flat area will create problems with such threading.

>3)Why not use a guide rod or two like cnc linear drives?
What do you mean with this? Google does not return much.

Some more details. We are using this to pump a mixture into a bed of absorbers (beads) so we run tubes inside the threaded rod.

Picture - the rotating nut that goes over the threaded rod.

File: Stopper_Flat_Area.png (38KB, 277x333px) Image search: [Google]

38KB, 277x333px

The "tongue" in this disc is in direct contact with the flat area of the rod.

File: Assembly.png (29KB, 423x327px) Image search: [Google]

29KB, 423x327px

This is the assembly of the threaded rod, the rotating nut, and a couple of discs including the one with the "tongue".

The rotating nut (>>1141216 )has a disk in its lower part which is sandwiched between two other discs (>>1141217 and another one), so when you rotate it, it stops and forces the threaded rod down or up.

>>1141199
> 3)Why not use a guide rod or two like cnc linear drives?
something like this. Just attach a solid rod from the carrage to the piston

Here's most of the stuff for $33
>http://www.ebay.com/itm/15x-BQLZR-8mm-Lead-Screw-40cm-Linear-Rail-Bearing-Block-Slide-Bushing-Horizontal-/152194430282?hash=item236f7eb54a:g:U3kAAOSwARZXpFws

Theres also these anti-backlash nuts that keep tension on the screw
>http://www.ebay.com/itm/8mm-T8x2-Lead-Screw-Trapezoidal-ACME-Brass-Anti-Backlash-Nut-Adjustable-Preload-/322001322283?hash=item4af8c6412b:g:1LsAAOSwKfVXIYyb

File: linear drive.png (188KB, 464x327px) Image search: [Google]

188KB, 464x327px

>>1141221
>like this
Forgot pic

File: schematic.jpg (46KB, 1600x1200px) Image search: [Google]

46KB, 1600x1200px

>>1141223
The piston is inside the tube and the piston ends in the tube.

There can be no rods or anything in front of the piston.

Piston - black
White - inside of the tube, only water and beads
Gray - threaded rod or leadscrew