pic: dual speed gearbox
 

Andy,
Very nice!

I was at River Rage, and I wish I knew you were using this so I could take a look!

How does the square dog work out? 229 is currently developing our next generation gearbox, and we're looking at using a Techno-Style dog shifter. How do you think this compares?

Thanks,
John

I Love! the square Dog, Very simple,small, and cheap, i may have to steal it

Thanks John,

The square dog works very well. I had limited air pressure during the event due to flexing in the plywood base. The drivers said they needed to come almost to a stop to shift but they loved the dual speed option.

I was going to introduce myself to you but had lost my voice by the end of the day. You and your team did a fantastic job reffing.

Thanks again,

Andy Brockway

BTW we will be at Bash@the Beach Sept 20, I will also have our original gearbox for everyone to see.

Happen to know off hand how much it weighs?

-Andy A.

Wow, congratulations on a really great job to team 716. That gearbox looks really compact and could be very easily lightened 226 style. It also looks great!

Cory

That's the first thing that I thought, when I saw this picture. The gearbox itself looks incredibly compact. Maybe it's the orientation playing tricks with my eyes, but wow.

It looks really awesome! Congratulations!

For a little reference, are the outer plates 1/4"?

What are the ratios on that? and what size is everything?

I am planning a white paper detailing the shifter mechanism within the next two months. I will include gear ratios and main plates in the write up.

In the meantime, The approximate weight without motors is 5 lbs. This is only an estimate as I forgot to do a weight check.

The output speed at the shaft is 162/684 rpm for low/high. We reused the gear on the CIM and the sprockets from the output so this dictated some of the ratio decisions.

This box is 2-5/16" wide by 2-3/4" tall. I am guessing it to be about 7" long, I left the file at home. The plates are 1/4", the ouput bearings are not flanged so the button heads keep them in.

I have been running flat out the last few weeks at work so I am a little behind on everything. I will answer questions as fast as I can.

White Paper Posted
 

I uploaded the white paper for this gearbox today. Detail drawings for the shift mechanism are included. The parts can all be made on a maual lathe and mill although having digital readouts is recommended.

I appreciate any feedback.

Andy