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1answer
18 views

Drive axis with slipping gear

I'm looking for a name of the mechanic part (axis-gear combination) with the following description to use it in an automatic window control. I can't find this online to get parts due to the lack of ...
3
votes
2answers
72 views

Making a motor controlled joint passive

Anyone know of a good (and economical) way to make a motor controlled arm become a passive link on trigger? That is, the joint can be active (motor controlled) or passive (rotate freely). The tip of ...
0
votes
2answers
80 views

motor controlled lazy susan

I'm trying to figure out an easy lazy susan setup. This is for video production, I want to be able to put an object on the platter and get a smooth consistent turn in order to shoot the object ...
-1
votes
2answers
673 views

DC geared Motor 20 NM 25 RPM small dimensions. [closed]

My application requires a DC geared motor with torque of 10 NM - 20 NM and low speed (25 RPM at most) and a small dimensions (120 mm length at most). I failed to find my specs at eBay, and Alibaba ...
1
vote
0answers
64 views

Design of an equatorial mount [closed]

I am considering designing an equatorial mount for astrophotography. I have been researching on the best way to do that and I am thinking on using a stepper motor with a gearbox. The thing is that it ...
0
votes
2answers
431 views

Robot clutch to disengage wheels

I have a robot that moves around autonomously. Very often I want to push the robot several feet to start a test over again, or sometimes I want to wheel the robot outside to my car or to a nearby ...
1
vote
3answers
3k views

One motor, two wheels (motor direction rotates one wheel forward, reverse for other wheel)?

Rewriting this whole question as I've learned a lot more since I first tried to ask. I'm building a tiny bot and looking to use two motorized wheels for movement, but only one motor. I'll have a 3rd ...
4
votes
3answers
3k views

Harmonic drives in hobby projects

After a fair bit of research into industrial robot arms I've learned that a lot of them use components like harmonic drives and sometimes cycloidal gearboxes. Two main questions: How feasible are ...
3
votes
4answers
113 views

Motor Choice given size constraint and load requirement

Good day everyone :) I am an undergraduate student working on a project involving the use of high torque small-sized DC motors for use in designing a person following trolley bag. Where in the ...
3
votes
1answer
75 views

POM gears and metal fittings

I'm looking at this setup: where the POM bevel gears are fitted with some kind of metal (bronze?) tube inside which fits over the shaft. What benefits does this method provide? Is it to allow the ...
1
vote
2answers
128 views

Suitable gear construction for a robotic extender - plastic?

I have a rather simple setup for my robotic extender. The DC motor turns a shaft with a worm on it. The worm connects to a small worm gear (green) which itself has a small gear (red) on the same shaft ...
0
votes
1answer
171 views

Difference between planetary and precision gear motors

i'm working on a building a rover and would like some advice on selecting motors. In particular, i want to understand the difference between precision and planetary gear motors. My robot will way ...
0
votes
3answers
154 views

Questions on gears for a robot actuator [closed]

I have some questions regarding building a gearbox for a motor to create a robot actuator. Given my desired motor and loads, I've determined that a gear ratio in the 400-700 range is adequate for my ...
3
votes
3answers
2k views

How high of a gear ratio can a motor have?

I want to make a robot arm where a joint is powerful enough to lift 8 kg up at a distance of 1 meter. This requires torque $tau = r*F = r*m*g$ = about 80 nm. So now I am trying to find the ...