Servos 180°

[Dieseldoctor]

My ongoing problem with servo travel.... I need a servo with 180°, but can't afford a tx with 150% overdrive. Solution _ disconnect the pot from the servo, and connect a remote pot linked to the part that is moving. It works on the bench, just needs fitting to my tipper truck.

 

[Tony]

Interesting. Post up some pictures of the setup when you get it going! And what are you needing a 180º servo on?

 

[Dieseldoctor]

I am making a tipper mechanism for a truck. There is not room for a standard servo, so I have to use a miniature servo, but to get the power needed to lift a full tipper body I need the servo to throw 180°.
Also, I want to use a 3 ch tx, but my tx 3rd ch is only full + / full -. The tipper body rotates through 90°, so with a 2/1 linkage, the power is right for the job. The remote position pot is connected to the tipper body, so the modified (to 360°) servo thinks it is a 180° SIMPLES!

 

[Tony]

Nice! Be sure to post up some pictures of the project when you get a chance. This sounds pretty interesting.

 

[Dieseldoctor]

Pics of the actual tipper truck will be following, but atttached are the drawings for the truck

 

[murankar]

I was wondering if you would be able to use two sservos with some mixing or a y harness to achieve your 180 degrees. Abused on your drawings it appears you might be able to.

 

[Dieseldoctor]

I've found the solution to the 180° servo problem - I've used a 360° continuous rotation servo to make a screw jack with the innards of an insulin syringe. This powers the tipper body. Another servo had the motor and gears removed, and this controls the limits of travel. I am well pleased with myself!!! Movie clip to follow when I work out how to shorten it

 

[D.O.G.]

The pictures are awesome and thanks foe sharing Doc. Can't wait for the video .

 

[Tony]

That is an awesome idea. I would have never thought to modify a servo into a screw actuator. Like Ivan said, I can't wait for the video of it working!

 

[Dieseldoctor]

Can't seem to get the video uploaded, it's either too big or incorrect format, but I'll keep trying.

 

[Tony]

You have to upload to youtube and then post the link here. We don't have the server space to host videos ourselves.

 

[Dieseldoctor]

You have to upload to youtube and then post the link here. We don't have the server space to host videos ourselves.

Thanks for advice - I will try that.

 

[Dieseldoctor]

I hope that this shows my actuator working.

 

[Admiral]

Great stuff, well worked out, congratulations.

 

[D.O.G.]

Too cool...Awesome. Thanks for sharing .

 

[Tony]

That is fantastic! Keep the updates coming!

 

[Dieseldoctor]

That is an awesome idea. I would have never thought to modify a servo into a screw actuator. Like Ivan said, I can't wait for the video of it working!

The idea of making a screw actuator from a 360° servo is not mine - I got the idea off utube. I developed the idea of the remote position sensor myself, and instead of using commercially available brass lead screw and nut, which needs metalworking facilities, I just used what I had available, namely the coarse threaded plastic rod and nut from an insulin syringe.