Help with telescopic assembly 1

[Petricor]

So I would use some help settling for a design here.

http://files.engineering.com/getfil...00-a811-a10edd03a1f6&file=20160628_190519.jpg

I was able to acquire telescoping tubing, but now i have to install the stops for each section, i've researched a bunch of designs basically looking for the one that will give me most stability, when extending and retracting but also with the least backlash.

I am working with about 1/16 gap on each side.

http://files.engineering.com/getfil...8b-9372-98077b7dc51e&file=20160628_190543.jpg

Thanks in advance!

 

[Sparweb]

You can make the stops out of the tubing itself. Cut off 1/4" from the end of one piece, weld it inside the next size larger tube; do the reverse with a piece of the larger tube welded to the outside of the inner tube. Rinse and repeat...

...but...

... you didn't tell me if you can weld that material...
... you didn't tell me what you are using this for...
... what load / stiffness do you need?

... so more information about what you are trying to make would be helpful.

STF

 

[Petricor]

Right, ok so this is what i am building. It was my first post here, so I wasn't sure if I was allowed to disclose the entire project.

https://drive.google.com/open?id=1qZ3gs6F6-TgUk6qGPV01-eG0bNnjI_0OJw

The telescope is part of a small scale prototype, serves as an extension of a vehicle which would be meant for 3D printing.

On the end of the telescope I will have a robotic arm which will serve as an extruder but also as a way to perform more tasks to the print.

The end of the telescope will weigh less than half a kg. However, the reluctance in my approach is somewhat extreme since I need the motion to be fairly stable, stable enough to lay a decent line.

I can probably manage to weld or braze the aluminium, i like your idea. I might end up doing that and just welding inner stops for retraction. Then im thinking about a way to install shims to close the 1/16 gap, i saw some friction-less tape during my last sight-seeing at a hardware store, might be a good way to do it too.