PaperModelers.com

Go Back   PaperModelers.com > Designers Corner > Tips and Techniques

Reply
 
Thread Tools Display Modes
  #1  
Old 09-19-2021, 10:09 AM
paperPino's Avatar
paperPino paperPino is offline
Member
 
Join Date: Feb 2010
Location: Visintini, Italy
Posts: 136
Total Downloaded: 32.15 MB
small electric motor with clutch...

Hi there!
Sometimes, especially at exhibitions and various displays, it would be very appropriate to operate the automata with electric motors. This would prevent the public from touching the models and causing any trouble, especially if the models are paper automata.
But there is a problem: especially with paper automata, things don't always go smoothly... and there can be a risk of a crash of some moving parts. Of course, the electric motor doesn't care about the crash and continues its work inexorably.
Is there an electric motor (small, of course) with a clutch that, when properly adjusted, will unlock the transmission axis in case ot any trouble, thus avoiding irreparable damage to the automaton?

Thanks!
Ciao,
PINO
__________________
http://www.paperpino.net
Reply With Quote
Google Adsense
  #2  
Old 09-19-2021, 11:46 AM
murphyaa's Avatar
murphyaa murphyaa is offline
Member
 
Join Date: Jul 2007
Location: Somewhere out there
Posts: 6,604
Total Downloaded: 313.47 MB
Send a message via Yahoo to murphyaa Send a message via Skype™ to murphyaa
I don't know of any motors with clutches, but I wonder if you could connect a motor to the model with a pulley and belt system. You could adjust the tension so that it would move the model, but start slipping when unexpected stoppages occur.
__________________
My New Website: https://murphs-models.com/
Visit my Youtube Channel
Reply With Quote
  #3  
Old 09-19-2021, 12:05 PM
paperPino's Avatar
paperPino paperPino is offline
Member
 
Join Date: Feb 2010
Location: Visintini, Italy
Posts: 136
Total Downloaded: 32.15 MB
we're talking about paper automata... it's a long shot....
__________________
http://www.paperpino.net
Reply With Quote
  #4  
Old 09-19-2021, 12:18 PM
Dane's Avatar
Dane Dane is offline
Member
 
Join Date: Dec 2013
Location: Saint-Petersburg, Russia
Posts: 346
Total Downloaded: 48.92 MB
Send a message via Skype™ to Dane
If I understood a task rightly for this purpose, limit switches can be used.
__________________
My personal site.
Reply With Quote
  #5  
Old 09-19-2021, 01:30 PM
paperPino's Avatar
paperPino paperPino is offline
Member
 
Join Date: Feb 2010
Location: Visintini, Italy
Posts: 136
Total Downloaded: 32.15 MB
Please, can you explain me better?...
__________________
http://www.paperpino.net
Reply With Quote
Google Adsense
  #6  
Old 09-19-2021, 05:35 PM
Dane's Avatar
Dane Dane is offline
Member
 
Join Date: Dec 2013
Location: Saint-Petersburg, Russia
Posts: 346
Total Downloaded: 48.92 MB
Send a message via Skype™ to Dane
Limit switch is a simple device which can switch on or switch off an electric circuit when you need it. For example, to terminate unwanted moving of some detail of your mechanism you install a limit switch. When detail moves to the limitation, the limit switch switches off the electric motor and detail will stop. This method is used to open the doors. When the door is open the limit switch rests on the stopper and switches off the electric motor which moves the door.

To better explanation I propose you to see this link: Limit Switch || Working and Connection of Limit Switch - YouTube
__________________
My personal site.
Reply With Quote
  #7  
Old 09-19-2021, 06:22 PM
Darwin's Avatar
Darwin Darwin is offline
Member
 
Join Date: Jun 2007
Location: Eastern Idaho
Posts: 2,158
Total Downloaded: 314.05 MB
I doubt a limit switch would do any good...by the time that which you don't want to move does move, the damage has already been done.
__________________
It's not good to have too much order. Without some chaos, there is no room for new things to grow.
Reply With Quote
  #8  
Old 09-19-2021, 10:47 PM
Jim Nunn's Avatar
Jim Nunn Jim Nunn is offline
Member
 
Join Date: Jun 2007
Location: Glendora, California USA
Posts: 1,157
Total Downloaded: 210.47 MB
To my knowledge there is no low cost torque limiting clutch that is available for such a small amount of torque. What I would suggest is to make a turntable for the model. on the underside of the turntable mount 4 small magnets. below the turntable mount the motor with a disk with 4 additional magnets on the same centers as the turntable. by carefully adjusting the distance between the disks you will be able to control the applied torque and when the turntable starts to slip.

a modified version would be to make the rotating disk that the model sits on out of Aluminum, no magnets are needed. This is called a eddy current clutch and is similar to how a AC induction motor works. note there is an inherit slip in this clutch such that the turntable disk will run at a lower RPM then the motor.


Jim Nunn
__________________
There is a very fine line between paper modeling and mental illness.
Reply With Quote
  #9  
Old 09-20-2021, 04:28 AM
Dane's Avatar
Dane Dane is offline
Member
 
Join Date: Dec 2013
Location: Saint-Petersburg, Russia
Posts: 346
Total Downloaded: 48.92 MB
Send a message via Skype™ to Dane
Quote:
Originally Posted by Darwin View Post
I doubt a limit switch would do any good...by the time that which you don't want to move does move, the damage has already been done.
It depends on how precisely you place a limit switch.

And further.... There is an Arduino with a huge number of sensors that you can select and install: magnetic, ultrasonic, infrared and so on. There is remote control by wi-fi module. This is an endless field for creations.
__________________
My personal site.

Last edited by Dane; 09-20-2021 at 04:44 AM.
Reply With Quote
  #10  
Old 09-20-2021, 01:39 PM
Kendo Kendo is offline
Member
 
Join Date: Sep 2021
Location: New York, USA
Posts: 15
Total Downloaded: 144.44 MB
Can you show an example of the application?

As a kid I used to make paper props and attach them directly to motor shafts...friction fitting adjusted correctly acts as a type of "clutch". It isn't for all applications, but on simple ones it may work very nicely.
Reply With Quote
Google Adsense
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -6. The time now is 05:35 PM.


Powered by vBulletin®
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.

Parts of this site powered by vBulletin Mods & Addons from DragonByte Technologies Ltd. (Details)
Copyright © 2007-2023, PaperModelers.com