fischertechnik community forum

I'm trying to fix a basic block 15 (32879) to an axle such that as the axle rotates, then the block rotates as well. It does not have to be a basic block but something similar that I can attach other blocks and connectors.

It looks like the turntable (Drehkranz-Oberteil) might be the answer although I am worried that the turntable is too large for my requirement. How does the turntable connect to an axle? A collet hub and nut?

Do I need both the turntable and the turntable case (Drehkranz-Unterteil) or can I get by with only the turntable?

Thanks and sorry for the English only.

Hallo,

take :
31915 Zangenmutter rot
37858 Klemmbare Schnecke
37925 Schneckenmutter

fix the Schneckenmutter hard to the Zangenmutter (with inserted Schnecke)

Gruß Ulrich Müller

Hi konjurer,

There are several solutions for your problem, including the following:

1) Fix a http://www.ft-datenbank.de/search.php?keyword=31019 "Drehscheibe" as usual to the axis and use it to build upon.

2) Use the goold old http://www.ft-datenbank.de/search.php?keyword=31016 "Seiltrommel", and perhaps attach a http://www.ft-datenbank.de/search.php?keyword=31020 on the axis end to tighten it.

3) Use the http://www.ft-datenbank.de/search.php?keyword=38844 "Achsverschraubung".

There may be more solutions.

Best Regards,
Stefan

This is a standard problem ... I'lll add:

Rastadapter 20 schwarz is my favorite for medium torque and plastic axles.

Klemmkupplung 20 rot might work if you don't need form-fitting, in combination with either Aufnahmeachse 20 rot or Rastaufnahmeachse 22,5 schwarz.

Heiko

Hallo Konjurer,

Another thing you could use is the http://www.ft-datenbank.de/details.php? ... a79846c304 achse mit vierkant.
The square block fits in the http://www.ft-datenbank.de/details.php? ... f8ad745222

Hope this helps.

Arjen

You guys are awesome! Lots of great options in those parts. I'm liking the Rastachse mit Platte if it can handle the torque when clipped to an axle.

One more question. The structure I need to rotate may require a lot of torque. I need to rotate the structure about 90 degrees. The structure is a amusement park "ride" simulation and will hold a row of 4-6 bucket seats (Schalensitz) and supporting structure, possibly more seats if possible (think of the Disney Soarin ride). I have an XM, XS and M- motors and lots of gears. Will I be able to rotate with the XM motor? Two motors - one on each side? Any suggestions?

Thanks again!

Hello konjurer,

I guess you will be able to turn things with those motors. You might not be able to turn it at any speed, however, but possibly have to fine-tune the gears so that you get the optimium. Now that's the fun part of fischertechnik: Getting that thing to work!

Success,
Stefan

You'll need Drehscheibe 60 if you have lots of torque. However, it might be a good idea to begin construction at the top (e.g. at the seats), then try to shave off as much weight as you can. Replacing this with this, removing parts ... but still try to keep it stiff. Then put the center of rotation close to the center of mass. Now you know the minimum power and stiffness you need for that joint. Build the next part to match the stiffness of the top, then do the third part and so on ... all the way down. This makes your model a lot lighter and more stable.

I did the same mistake with the robot arm I made. The bottom was nice, the upper and lower arm part were actually beautiful, but the wrist was way too bulky and heavy. Had I begun at the wrist, that might have worked.

Heiko