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Flat-Faced Cam Design

08/08/2017 4:47 AM

hello everyone

i am a biomedical engineer but i am required to design a flat faced cam which is going to use in a biomedical machine for the purpose to translate partial rotational motion to partial linear motion so can any one suggest ne the design steps for that or any other options for this purpose.

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#1

Re: flat faced cam design

08/08/2017 4:50 AM

An Archimedean spiral is likely to be involved somewhere in this (if you want uniform linear motion from uniform rotational motion).

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#2

Re: Flat Faced Cam Design

08/08/2017 9:44 AM

What do you mean by "flat faced?"

I can see that "partial rotational motion" might mean not going all the way around, but what is "partial linear motion?"

Something like this, perhaps with one of the "sides" made flat:

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#3

Re: Flat Faced Cam Design

08/08/2017 12:38 PM

Something like this?

https://makingthat.wordpress.com/02-mechanical-components/

It's much cheaper to find off the shelf parts that will work for a project like this, instead of custom making everything, at least keeping the custom parts to a minimum....First you need to make a basic drawing with all the necessary measurements of motion and space constraints if any..., then the search for parts can begin...Do you have, or know how to use, design software?

https://www.youtube.com/results?search_query=simple+cam+designs

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#4

Re: Flat Faced Cam Design

08/08/2017 12:43 PM

Enlist the services of a mechanical designer.

7 Steps in Creating a Functional Prototype - National Instruments

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#5

Re: Flat Faced Cam Design

08/08/2017 1:07 PM

Would you have a uniform velocity-displacement curve for us to go off of?

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#6

Re: Flat Faced Cam Design

08/08/2017 2:37 PM
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#7

Re: Flat Faced Cam Design

08/08/2017 5:22 PM

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#8

Re: Flat Faced Cam Design

08/08/2017 10:40 PM

Maybe a simple swash-plate mechanism meets your needs.

Here's a design guide for that:

http://article.sciencepublishinggroup.com/pdf/10.11648.j.ijmea.s.2015030102.13.pdf

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#9

Re: Flat Faced Cam Design

08/09/2017 2:42 AM

i am really thankful to all of you for your suggestions and support,

i have drawn a basic scheme. in this cam follower mechanism i have mentioned the initial conditions of dimensions,and the rotation of cam is limited by only 30 degree and according to this rotation the follower shifts 3 mm , now the questions are

1.how to determine the major radius of cam?

2. how can i determine shape of cam and what should be the profile according to that?

3.and if i make my follower inclined with reference to horizontal axis at theta degree (as shown in fig B) then how to determine the cam profile and what should be the theta for maximum efficiency ?

4.what is the relation between the torque applied to cam and force generated to follower ?

i need the steps to draw these profile of the cam and angle theta ?

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#10
In reply to #9

Re: Flat Faced Cam Design

08/09/2017 6:21 AM

Does the CAM have to be "CAM" shaped?

Does the centre of rotation of the CAM have to be 4mm offset from the centre of the follower?

In this design I've added a small wheel to the end of the CAM to reduce friction.

The CAM is exactly 6mm long (centre to centre), and the centre of rotation is 5.6mm from the centre line of the follower.

(6xsin(30°) = 3)

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#11
In reply to #10

Re: Flat Faced Cam Design

08/09/2017 6:32 AM

no it's not necessary that it must have as cam shaped, but i am concerned about the efficiency of the force transfer.and we can give slight permission to change the offset.

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#12

Re: Flat Faced Cam Design

08/09/2017 9:21 AM

I found this on Google. Provides designs and equations.

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#13
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Re: Flat Faced Cam Design

08/09/2017 9:49 AM

thanks tonyhemet

can share me this as link ??

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#14
In reply to #13

Re: Flat Faced Cam Design

08/09/2017 11:16 AM

Seriously? Can you not do it yourself?

It is very easy to type "Introduction to Mechanisms" in Google, which gets you this:

Choosing the second item in the list takes you there:

Took me about 10 seconds to do the search!

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#15
In reply to #13

Re: Flat Faced Cam Design

08/09/2017 8:36 PM

As a link, why ? ( Using the word, " why " , is it necessary to then use a question mark, ? . )

Do you have access to the Google search engine ? If you indicate the internet provider that you use and it's limitations, there are many folks here that would love an opportunity to help advise you.

I simply opened google and typed in the search box ( Lyndoor industries showed me how to do it ),

flat faced cam

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#16

Re: Flat Faced Cam Design

08/10/2017 12:20 AM

Yes I found it thanks tonyhemet

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#17
In reply to #16

Re: Flat Faced Cam Design

08/10/2017 1:34 AM

There is a <Reply> button on each and every post. That way, you can reply directly to that post.

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#18

Re: Flat Faced Cam Design

08/10/2017 1:39 AM

If you are a biomedical engineer, I believe you would already know the steps to take to design this. I also believe that this is a class assignment. Either that, or you went to a really crappy college.

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