Choosing a Solenoid for A2 Level Product Design

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SUMMARY

The discussion centers on selecting an appropriate solenoid for a bicycle workstand design involving a ratchet and pawl mechanism. The user, Dom, inquires about the strength of a specific solenoid model (RS Online D Frame Solenoid, part number 2500704) which provides a push force of 150 grams with a 5mm stroke. Key considerations include the weight of the bicycle (12.1kg) and the materials used (nylon ratchet wheel and aluminum pawl). Additionally, the user seeks clarification on the differences between various solenoid types and how to calculate the current required to effectively lock the ratchet.

PREREQUISITES
  • Understanding of solenoid specifications and ratings
  • Basic knowledge of mechanical design principles
  • Familiarity with materials used in mechanical components (e.g., nylon, aluminum)
  • Ability to perform force calculations for mechanical systems
NEXT STEPS
  • Research solenoid force ratings and their implications for mechanical locking mechanisms
  • Learn about the differences between linear, rotary, tubular, C frame, and D frame solenoids
  • Explore methods for calculating the required current for solenoid operation
  • Investigate alternative solenoid models that provide higher force ratings if necessary
USEFUL FOR

This discussion is beneficial for product designers, mechanical engineers, and students involved in A2 Level Product Design, particularly those working on projects that incorporate solenoids and mechanical locking systems.

ildottorebard
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I am doing A2 Level Product Design (as well as Physics obviously ) and I am making a workstand for a bicycle. It involves a ratchet and pawl mechanism which will be locked out by a solenoid acting on the pawl.

The bike weighs roughly 12.1kg and the ratchet wheel from nylon. The pawl is aluminium and will be pushed into the ratchet by the slug protruding from the solenoid.

I do not have any idea as to whether this solenoid will be strong enough, so please could someone let me know if it is?

http://uk.rs-online.com/web/p/d-frame-solenoid/2500704/

If not, is there any particular size I should be looking for? Also, can anyone explain the difference between the difference between linear, rotary, tubular, c frame and d frame solenoids? One last question, how do I determine the current needed to lock the ratchet in place.

If any of those questions could be answered I would greatly appreciate it.

Many thanks,

Dom.
 
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I don't really understand your application, but solenoids are rated to provide a certain push / pull force. Do a little calc and figure out what you need. The one you linked to, for example, provides 150 gram force with a 5mm stroke.