Rack and Pinion Design 1 - spur gear design in solidworks
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- เผยแพร่เมื่อ 15 มิ.ย. 2024
- How to design a working steering rack, rack and gear or rack and pinion mechanism, understand how the pitch circle drives other factors. Identify which characteristics control the gear design and why the module, number of gear teeth and pressure angle are important. The relationship between addendum, base diameter, pitch diameter, clearance diameter and root diameter is also discussed.
This video gives a practical demonstration on how to detail the spur gear, involute curve, gear tooth profile, pitch circle, circular pitch, dedendum, addendum, whole depth, addendum circle, clearance circle, root circle, base circle, pressure angle and how it relates to rack design.
took me a week to find a right video whose actually use the equation and drawing techniques right. thank you
Thank you for this helpful video. I followed along with your process in Fusion 360 and found that each step could be followed more or less exactly with Fusion's very similar tools.
I did run into a problem, however, when I tried to change the variables after creating the gear. Some small changes that should have worked destroyed the tooth geometry. I discovered that the fit point spline has handles for each point we linked to create the involute curve, and if those handles are unconstrained, wacky things will happen when parameters get redefined. So I'm now going through the process of figuring out just how to constrain each handle. I believe the handles should be perpendicular to the tangent lines that intersect them, so adding tangent constraints is my first move. I also think the length of each handle should be proportional to the length of the tangent line (i.e., it will be some multiple I haven't discovered as yet). I'll come back and leave another comment if I figure it out.
After quite a lot of experimenting with different formulas to try to find handle lengths that worked for a wide range of module values, I ended up homing in on a constant value that works extremely well (in Fusion anyway; YMMV). Setting all the handles to a length of PI (3.14 mm) finally did it!
love you
Hello! Great video though I have a question concerning the formular you used for the CIRCULAR PITCH. In your other video th-cam.com/video/IBcGLpQnfYk/w-d-xo.html at 4:17 used defined the CIRCULAR PITCH formular as Module*Pi. But in this video at 18:14 you define the CIRCULAR PITCH as 360 / Number of Teeth, kindly explain. I am a bit confused, thank you.
In the first equation the result is expressed in mm. The equation in this video is expressed in degrees, it is defined as the angular pitch = 360°/ number of teeth, then divide it back by 2, to get half the pitch. Why half the pitch? Answer: because that is what you are drawing, half the pitch, which would be the cut to define the gear tooth.