HOW TO: Gear Design(Internal TRUE INVOLUTE) with AutoCad
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- Опубликовано: 11 сен 2024
- I design my TRUE INVOLUTE INTERNAL gears with Autocad. The formulas and sketch descriptions are used in the "AutoCad Gear Procedure for Internal and External" video I have uploaded. That video was taken as I scrolled thru a Word Document.
Here, the occasional "audio swap" music and video synchronocity are purely coincidental!
Simply the best technique I've ever see (Including the production of the music), Congrats & Tks a lot for sharing!
@BenTommyE , Glad to help you. Thanks for the kind comment. Hopefully, the classical music helps get thru this without pulling hair out. Later.
You are welcome and thanks for your interest. Later, Rick.
Thanks for the kind comment. Later, Rick.
The Gear model is done for many years. i can't find it.
But, You can see the film "PlotSphereUsingLisp" :
instead, I applied MFC to simulate gears' snapping since thirteen years ago. You can see the film "contactLineOfGear" :
thank you, i was searched for this tut.
@FERNANDO11827 , thank you for your kind comment friend.
Interesting how gear teeth mesh along the pitch and line of contact as you have shown. Good job and thanks for the upload. My videos show how to make a gear drawing based on real world parameters with backlash so that you can use that sketch to actually make that gear!! You know, real world stuff. git 'er done. Later, Rick.
Wow! That is quick! Please upload a video to show the world what you claim can be done. Later, Rick.
Thank you . Sir
You are right, good job.
truely beautiful!, art and science.
I use another cad (3D brrrr) myself, but this is useful.
as I understand it, this is not exact but a useful approx.
I mean the unrolling of the evolvent.
but it's probably something I did not get.
I think I know how to do this in NX now.
mille gratzi
Sir, thank you for the positive comment. Later, RT.
For the gear I wish to make, the base circle on the internal gear is inside the addendum and dedendum. I was wondering how the internal tooth gear can be drawn for this? It results in the tooth profile stopping halfway through the addendum and dedendum. Gear is Num of Teeth=23 and Pitch = 0.5.
Also great videos! Great method for creating gears.
Increase the pressure angle enough to make the base circle a smaller diameter than the addendum. Thanks for the positive comment and your interest. Later, RT.
That fixed it. Haha. I think I will have to do some re-design anyway... getting a higher pressure angle cutter (more than 20 degree) seems much more difficult. Thanks for the quick reply!
Thanks for making this video. May I ask why is 0.004 radius? calculated by the number of teeth?
A radius creates an intersection on the pitch circle where a radial line can be drawn from center of pitch circle to that intersection and a radial line drawn from the center to where the involute curve crosses the pitch circle. When you measure the angle of those two radial lines that is how much you rotate the involute to provide some backlash between gear teeth. Here I made the ring gear tooth SPACE slightly bigger and the corresponding teeth of the spur(external tooth)shown in my other videos slightly smaller so the teeth will mesh. That is what backlash is. Thanks for your interest.
Would anything about the process change if you were drawing in metric units instead of english units?
I wouldn't think so. Although the metric angle system could be problematic(he-he-he, just kidding). Thanks for your interest. Later, RT.
You can draw an involute in one second using autolisp.
In the video you mention in the description, it says to make the tangent line from the right of the backlash circle, but in this video, you should tangent to the left of the circle. Which is correct?
+nickb2370 @8:20 the description clearly states to "draw line from left of .004 radius circle to center of gear....." Is this what you were talking about?
+Rick Taylor, yes it says that in this video, but in the video referenced in the description with the "text book style" how to video it says to draw it from the right. Just wondering why the videos don't agree with eachother. thanks!
+nickb2370 because in the "text book style" vid it describes how to draw an EXTERNAL gear tooth profile. The descript for the INTERNAL is afterwards and suggest drawing the line from the "other side" (left) when doing the INTERNAL. Understand?
+Rick Taylor Got it, thanks for the videos and replies!
Excelent.- than´ks dear friend.- ferfer.- GALICIA.- SPAIN....FOREVER.....-
bscklash radius 0.004 or it should be 0.04?
+Султан Арзиев hello, correct, .004 inch(4 thousandths). Rotate the involute such that the internal tooth profile is a bit bigger and the external is a bit smaller so they will have clearance when engaged. I draw gears so that they will actually work together whether they are made on the CNC or made from plastic on a laser or 3-D prototype machine. Later, RT.
This is not an involute. It's OK if you are driving a go-kart but will result in periodic error if used on a telescope drive
+BingoSunNoon this is an involute curve because I used a SPLINE to connect the ends of each line. A SPLINE is a constantly changing curve with no center point. I use a chain drive on my go-cart. You are welcome to check-out my chain sprocket procedure videos if you wish to know how to create a chain drive system. Later, RT.
Definitivamente no es evoluta. El radio del circulo que utiliza para trazar la un punto cualquiera de la evoluta es de menor dimensión que el arco de circunferencia subtendido.
@@elultimodelafila5223 pay attention to the video...I used a SPLINE command in Autocad to connect the points of intersection of the circles and lines. You should understand what a SPLINE is in reference to the AutoCad software.
jesus
Could have been good but for the stupid music!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1
HaHa......Lesson...don't make stupid comments and associate it with the name of your business. Consider taking a business course. HaHa!!