topic Re: How to make a custom gear in Inventor Forum

How to make a custom gear

AleSakh — Sat, 01 Apr 2023 02:04:36 GMT

There is a small gear, but in order to make it work, you will need a larger gear with 60 teeth. I am not sure how to proceed, could you please advise me on the easiest way to do this?

Re: How to make a custom gear

EdvinTailwind — Sat, 01 Apr 2023 09:15:51 GMT

The "easiest" way is most likely the Spur Gear Component Generator, available in an assembly. It's complex and there are a lot of settings.

One thing that you might want to reconsider is if you really want to set the number of teeth in advance, as this makes it impossible to change the center distances and the gear ratio.

Here's a very quick How-To video:

https://www.youtube.com/watch?v=aQihInaFduI

Also useful:

https://help.autodesk.com/view/INVNTOR/2023/ENU/?guid=GUID-CAB3855A-B6B6-44AA-978F-D086217CF2B3

https://www.youtube.com/watch?v=ZgbBKwDKTpk

Re: How to make a custom gear

JDMather — Sat, 01 Apr 2023 12:09:50 GMT

@AleSakh

What version of Inventor are you using?

Re: How to make a custom gear

JDMather — Sat, 01 Apr 2023 14:06:09 GMT

@AleSakh

The small gear does not appear to be true gear toothform.

Where are you getting your information for the gears?

Do you have pictures?

Re: How to make a custom gear

AleSakh — Wed, 05 Apr 2023 03:20:42 GMT

You're right! This gear is special. This competition task has a small gear and you need to make a big one for it to work.

Re: How to make a custom gear

AleSakh — Wed, 05 Apr 2023 03:22:59 GMT

Thank you, but if done with the help of a generator, then the small gear turns out to be a slightly different shape than the sample.

Re: How to make a custom gear

EdvinTailwind — Wed, 05 Apr 2023 09:09:14 GMT

I see. That didn't occur to me.

If you just want the teeth on the large on to be identical to the ones on the small then you could copy the tooth shape from the small one to a new part where a circular shape has the desired outer diameter as in your large part, minus double height of tooth (87,511 - 2 x 2,728 = 82,0554). Then extrude the tooth sketch and make a circular pattern with 60 items.

As the larger one obviously has a flatter diameter the final outer diameter will be slightly smaller. I got a -0,015 mm difference. You could compensate for this when dimensioning the circular shape.

Re: How to make a custom gear

JDMather — Wed, 05 Apr 2023 12:58:55 GMT

If this is a competition then shouldn’t you solve on your own?

What do I win if I solve?

Why did you not answer my question about what version of Inventor you are using? Can you read 2024 files?

What is the link to the rules for the competition?

Are you familiar with calculating Tooth Diametral Pitch and Pitch Diameters?

Can you Attach the *.ipt file of your attempt here?

What is the center-to-center distance between the gears?

Re: How to make a custom gear

JDMather — Fri, 07 Apr 2023 20:54:57 GMT

@AleSakh

Did you solve this problem?

Re: How to make a custom gear

tomasz.sztejka — Tue, 11 Apr 2023 07:49:47 GMT

Ha! Competition. First it looks like a "watch" type gear. Or just a "tricky gear" to make Your work harder. The gear generator will NOT work in this case.

Now what is exactly the goal of Your competition? What will decide who did the job best?

Having given the shape of a one gear the best way to create a true working counter-part gear it is to "roll" the small gear around the big gear "dummy" and use the small gear as a cutting tool. Exactly as if the "slotting machine" (I'm not sure if it is a correct name) would do it during machining the gear. This way You will get the best matching shape and a smooth operation. Any other process, I suppose, will either create problems with gears locking on each other, a backlash or jerky, non-smooth motion.