Help with custom transmision and gear CAD.

[roboticWanderor]

Originally Posted by Greg Needel

One of the first things I do when designing a transmission is similar to you I take a look at the ratios I want to achieve and then make a spread sheet of the available gears and their pitch diameters. Using this info I can play with gear sizes to obtain the desired ratios.

When going to CAD the transmission I recommend not doing the teeth features to start and just making cylinders that have an outside dimension of the pitch diameter.

Originally Posted by JVN

I typically design using cylinders at PD (as Greg described). I end up changing my gearing approximately 100,000 times during each design process so these approximations make my life way easier.

That's how I worked out the spacing and gearing of my dual CIM gearbox that I designed. Getting the drawings off of the suppliers website might be your best bet in terms of inventor, however [Solidworks fanboy] SolidWorks Toolbox feature has a great gear, sprocket, etc creator that works very well, so if you are looking to make your own drawings that is your best option [/fanboy]

be sure to check your math and measurements and use the tools available to you, such as the JVN calc. Happy CADing!

[kramarczyk]

We built this exact set-up for overdrive with AM parts as Nikhil suggested.

AM SS with 4:1 span and 48:17 output into a 24:22 chain reduction (AM sprockets of course).

It works fine on the long breaks, but be advised, it can be expensive from a power consumption standpoint (especially with a skid steer). If you map your floor speed to power and efficiency you'll get the picture. Since I already have the plots I've included them.

[Andy Baker]

Originally Posted by kramarczyk

We built this exact set-up for overdrive with AM parts as Nikhil suggested.

Not only did Mark's team use this setup, he was the friend who suggested this ratio as an option. Last fall, at the ARC event in Warren, Michigan, Mark and I were talking about the need for a wider reduction between low and high.

A good number of teams used this option on their Shifters last year.

Thanks to Mark for making this suggestion.

Sincerely,
Andy