Laboratory Rocker - type of mechanical movement & related information

AI Thread Summary
The discussion focuses on the mechanical design of a laboratory rocker, specifically seeking information on the relationship between motor circle radius, pin location, and table bearings for a smaller version. Participants suggest considering specific output requirements such as frequency, maximum angle, and weight of the sample to optimize design. Resources like Wikipedia's linkage page and "Machinery's Handbook" are recommended for understanding mechanical linkages and cam design. There is a call for sharing dimensions and rocking angle limits to facilitate calculations for pin positions. Overall, the conversation emphasizes the need for technical resources and collaborative input to achieve a successful design.
JohnSa
Messages
1
Reaction score
0
Hi all

I have a question about this device in https://www.thingiverse.com/thing:2948680/files. Where can I find more information/reading material about this type of mechanical movement (for example, what is the ratio between the motor circle radius, pin location and the table bearings).

I wish to print a smaller one but I do not know where to start.

Thanks
 
Last edited:
Engineering news on Phys.org
Welcome, @JohnSa !

Do you need an specific output for the sample to be rocked?
Example: frequency, maximum angle, weight of sample, way to fix sample to platform, etc.
The one shown in your link has an electronic panel controlling the motor.
It seems that because of that, the frequency and duration of the oscillation can be programed.
 
Welcome to PF.

Start reading here; https://en.wikipedia.org/wiki/Linkage_(mechanical)

If you can post your required dimensions and the rocking angle limits, we can compute the length between the pins, and so the pin positions on the components.
 
I have a question about this laboratory rocker, mainly about the part in the image attached red ellipse. Is there a technical scheme and mathematical equations set that allows me to simulate it using Matlab/Python? By this set it will allow me to calculate a rocker in different sizes.

machLinkage.png


BTW: I am a programmer and keen 3D hobbyist and not an engineer so any help will be appreciated.
 
Last edited:
hsi100 said:
I have a question about this laboratory rocker, mainly about the part in the image attached red ellipse. Is there a technical scheme and mathematical equations set that allows me to simulate it using Matlab/Python? By this set it will allow me to calculate a rocker in different sizes.

View attachment 333991

BTW: I am a programmer and keen 3D hobbyist and not an engineer so any help will be appreciated.

If you have no experience I'd first check the link posted by @Baluncore at #3.
Baluncore said:
Welcome to PF.

Start reading here; https://en.wikipedia.org/wiki/Linkage_(mechanical)

If you can post your required dimensions and the rocking angle limits, we can compute the length between the pins, and so the pin positions on the components.

The section "Planar one degree-of-freedom linkages" should be especially relevant.
 
Posted June 2024 - 15 years after starting this class. I have learned a whole lot. To get to the short course on making your stock car, late model, hobby stock E-mod handle, look at the index below. Read all posts on Roll Center, Jacking effect and Why does car drive straight to the wall when I gas it? Also read You really have two race cars. This will cover 90% of problems you have. Simply put, the car pushes going in and is loose coming out. You do not have enuff downforce on the right...
Carburetor CFM A Holley Carb rated at 500 cfm 2 barrel carb has venturi diameter of 1.3/8". There are 2 barrel carbs with 600 cfm and have 1.45 diameter venturi. Looking at the area the 1.378 bore has 5.9 sq. Inch area. The 1.45 dia. has 6.6 sq. inch. 5.9 - 6.6 = 0.70 sq. inch difference. Keeping the 500 cfm carb in place, if I can introduce 0.7 sq inch more area in the intake manifold, will I have the same potential horsepower as a 600 cfm carb provide? Assume I can change jetting to...
I'm trying to decide what size and type of galvanized steel I need for 2 cantilever extensions. The cantilever is 5 ft. The space between the two cantilever arms is a 17 ft Gap the center 7 ft of the 17 ft Gap we'll need to Bear approximately 17,000 lb spread evenly from the front of the cantilever to the back of the cantilever over 5 ft. I will put support beams across these cantilever arms to support the load evenly
Back
Top