White Paper Discuss: 2 speed, Shift-on-the-fly TechnoKat Gearbox

[CD47-Bot]

Thread created automatically to discuss a document in the White Papers.

2 speed, Shift-on-the-fly TechnoKat Gearbox by Andy Baker

[Andy Baker]

Just to let everyone know, I just posted the 2003 TechnoKat gearbox in the white papers section on this site and under the "Resources" section on the TechnoKats site. This is the "2 speed, shift-on-the-fly gearbox" that worked well for us this year.

It is a significant improvement over our 2002 model. Most significant are the changes made to make it easier to fabricate (no EDM needed, etc.). The document includes an extensive writeup, assembly prints, BOM, and detail prints.

Download and enjoy. I will have hard copies of this at IRI (enough for 1 for each team).

If you use or improve upon this design, please let me know.

Andy B.

[Ricky Q.]

Thanks Andy, been waiting for this one

[Andy Brockway]

Thanks Andy!

There does not appear to be any write-up with it. I am interested to know if you have any disassembly/assembly fixtures for removing/installing the press-fit gears on the drill and CIM motors.

I hope to have my simple dual motor white paper posted by the end of the month.

[sanddrag]

Thank you so much.

[Andy Baker]

Initially, I uploaded the wrong version of this paper. My buddy Ricky Q. notified me right away, and then I got the better version uploaded. Thanks Ricky and Brandon for being "on the ball".

Andy B. - the absent minded engineer

[FotoPlasma]

Originally posted by Andy Baker
Andy B. - the absent minded engineer

I would definitely not say that, especially considering the quality of this work.

Great job.
Keep up the great work.

[Cory]

Awesome job, Andy. Its always great to see teams releasing stuff like this to share their success. One little discrepancy that I noticed while browsing it is that the stall torque is higher in high gear than low gear. I think the numbers were just reversed. Dont mind my nitpicking Great job!

Cory

[Tytus Gerrish]

what kind of mill do you have?

[dez250]

great release Andy, i cant wait to get enough time to look over everything and see if i can duplicate this in my spare time...
~Mike

[JVN]

Originally posted by dez250
great release Andy, i cant wait to get enough time to look over everything and see if i can duplicate this in my spare time...
~Mike

Mike,
There are 2 comparable shift on the fly systems sitting in Colonie HS. Check out the Shen 1997, 2000, 2001 and 2002 robots. It's not overly difficult to add a 2-motor combiner to one of these. Believe it or not, 250 has much of this technology in the closet.... literally.



Andy,
Great paper, the reliablility of your "dog shifter" design is certainly making me re-think my "pin shifter" design. We (229 drivetrain guys) are definitely going to have to sit down in the fall and decide what direction we're heading in next. It's amazing for me to think that because of your posts, whitepapers and work, you've had a similar (catalyst) effect on teams across the country. You always help raise the bar!

So what's next for 2004?

Thanks Again,
Your team's openess is an inspiration to us all,

John

[dez250]

john i know we have things like this literally in the closet, i just wanted too have fun at my house/in the shop in my free time and just use some things i have and see if i can do it myself, or with help from some others to make it for a practice bot I'm looking to build... Yeah that prob wont happen though since i don't have much free time...
~Mike

"Learn from the experience of others..."

[sanddrag]

Originally posted by dez250
john i know we have things like this literally in the closet, i just wanted too have fun at my house/in the shop in my free time and just use some things i have and see if i can do it myself, or with help from some others to make it for a practice bot I'm looking to build... Yeah that prob wont happen though since i don't have much free time...
~Mike

It's not just the time. It's the money. Otherwise my team would be building one right now. We figured it would be about $250 for just gears for one gearbox. Of course that was with some slightly different ratios that we came up with.

[dez250]

yeah the money matters, but the time is first, and having access to what i need now, which for a change i have in my storage...
~Mike

[Joe Clohessy]

Wow ... I came up with valid ratios in about 2 days with spacing considered Casue for your 2 speed you cant have 12 driving a 24
and for your other speed say on that same shaft a 32 driving a 30
All in 2 days work.... Whats taking so long??? he he