My team is coming up on its third year as a FIRST robotics team, and i found myself thinking about how we could not use the simple drill motors to power our massive machine next year. looking at alot of robots this year at competition, i noticed that they are using their own gearboxes. All im asking for is a good reference on how to make your own gearbox. since my team doesnt have any engineering teams to back it up i was hoping to find out how we could do it on our own. thnx for your help.
ChaosmonkeyâŚ
âYou can take the monkey out of the chaos, but you cant take the chaos out of the monkey.â - me
So bad this thread is in the motors forum, because very few people read it.
Iâm also very interested in gear transmissions.
I looked for some in the nationals, and I liked the ones in teams 60 and 68.
This is the frist year team 60 built gearboxes for this competition. We took some chances not knowing how we our design would work. They worked perfectly. In order to make boxes like these you will need the help of a machine shop. I have the drawings on CAD if anyone wants the files E-mail me at glenn@laron.com. I will send the info to you along sources for the materials.
Glenn
*Originally posted by ChaosMonkey *
** My team is coming up on its third year as a FIRST robotics team, and i found myself thinking about how we could not use the simple drill motors to power our massive machine next year. **
Hold on a minute⌠Do you mean to tell us that you use the drill motors with a 1-1 gear ratio with the drive wheels??? Please tell me you are not doing this?? That is CRAZY man!!!
The CCT is a continuously variable transmission that is not that difficult to implement. Like Glenn says, you will need someone with a machine shop to make the housing. I will be posting all the drawings, the parts list and the theory behind the CCT in the white papers section of this forum. The drawings will be in both AutoCad and SolidWorks format. Since all the components were designed in 3D using SolidWorks, I will also post the solid models and assemblies in SolidWorks 2001 format. I am hoping other teams can make the CCT work for them as it worked for us.
Glenn,
Maybe you could post your AutoCad drawings on the White papers section, also.
*Originally posted by Paul Copioli *
**Thanks for the compliment Matt.
The CCT is a continuously variable transmission that is not that difficult to implement. Like Glenn says, you will need someone with a machine shop to make the housing. I will be posting all the drawings, the parts list and the theory behind the CCT in the white papers section of this forum. The drawings will be in both AutoCad and SolidWorks format. Since all the components were designed in 3D using SolidWorks, I will also post the solid models and assemblies in SolidWorks 2001 format. I am hoping other teams can make the CCT work for them as it worked for us.
Glenn,
Maybe you could post your AutoCad drawings on the White papers section, also.
To answer ChaosMonkeyâs original question. There are several resorces out there. Machineryâs Handbook is one. For questions on basic design of gear boxes it is very useful. Also about how to do tons of other things too. It ainât cheap so see if you can find a used one. They never go out of date, even though they publish a new edition every year. I used to borrow a friendâs but he went to another company so I guess Iâll have to go find one myself
I am looking forward to seeing Glennâs and Paulâs designs. From the descriptions I have seen here, Paulâs is very like something we were going to do this year until we went to three wheel drive. It would have been on my list of âmust seeâ items if I had been in Florida. I also liked 190âs CVT. I designed a version of that last summer that I dropped because it was too complicated. 190 showed me a simpler way. I had 5 âidler wheelsâ instead of 190âs 2 because I underestimated the friction factor.
Also stay tuned for a âwhite paperâ similar to our âdual motor mounts from last yearâ, but for the shift on the fly transmissionsâŚ
Hopefully Andy Baker decides to do this similar to last year (heâs a busy man), but if he does look for it under the resources section at www.technokats.org or the white papers here.
As for our transmission design and whether it will be published, there are a few issues:
The design is not as âcleanâ as the dual motor mount that is already published. Keep in mind that this gearbox was designed in about 4-5 days, after we all found out about the Chiapua motor addition to the kit. I would definitely have to put in some time to clean up some of the little errors and such to make it presentable.
Since this design was done in haste, 3 of the 7 gears involved in each of the 2 gearboxes were custom sized and had to be wire-EDMed. I donât feel really good about publishing a design that many teams wonât be able to re-create. When I take the time to go in an clean up the designs, I will try to find some standard gears to replace the custom ones⌠this may change the ratios a bit, but not too much.
We still need to make a âteam decisionâ on if, when and how to publish this. Iâd really like to make a âdesign handbookâ which not only has this design in it, but also the dual motor mount, and possibly some other things.
Iâd bet that this will be published⌠Iâm just not sure when itâs gonna happen. It may be a month or two before it happens.
What I REALLY like seeing is that other teams are finally stepping up to the plate and beginning to publish designs for other teams to use. We went out on a limb two years ago and published detailed mechanical designs for other teams to use and now other teams are joining in. Kudos to Paul (217) and Glenn (60) for providing engineering support to the FIRST community.
Our team has become proficent at building custom gearboxes and wheels, but we have yet to establish a variable speed tranny. I have seen many good examples out there, but I am looking for a very reliable system that really never needs to be fixed. Our drill gearboxes frim last year still havenât had any work done on them and we drive um hard.
We used similar ones this year along with similar chipua ones, ANd never had a single problem, besides being a little slow. I respected many of the variable tranies i saw, one of my favorites being 322. Does anyone have a good, simple, no pneumatic, design for a shift in the fly 2 or preferably 3 speed transmission.
P.S. Techno Cats, I really wanna see detailed drawings of your transmission, it looks amazing, and i love your track drive this year.
Team 716, the WhoâsCTEKs would like to share our 2002 dual motor gearbox design. I have submitted it to the White Papers today.
We made it through our rookie year due to the generosity of Team 157, the Aztechâs, and Mike Faticanti who shared with us their motor mounts and gave excellent advice on the drill motors.
This past year we discovered this forum and so thanks also go to Joe Johnson and to Team 45, the Technokats for their white papers on motor mounts and drill motor advice. Thanks also to ChiefDelphi for sponsoring this forum.
This design started as a combination of Team 157âs and Team 45âs designs and was changed to a dual motor setup when we saw the Atwoodâs. The drawings are in AutoCAD R14.
We are posting this for other teams to use and modify for their robots.
*Originally posted by Andy Brockway *
**This design started as a combination of Team 157âs and Team 45âs designs and was changed to a dual motor setup when we saw the Atwoodâs. The drawings are in AutoCAD R14.
We are posting this for other teams to use and modify for their robots. **
!!!
This is excellent! This was our whole point with publishing our designs. Now, the flood gates are beginning to open and we are starting to see more designs published.
Way to go, Andy Brockway and the rest of team 716!!
These guys sure âget itâ. They come in here to the FIRST competition, make some neat designs, compete, and then are gracious enough to publish them for all of us to see.
I have sent our swerve gearboxes DWG out to quite a few people already so I just sent it up to the White Papers also. The layout of the print isnât as good as it should be but here is what the gearboxes consist of. We used the Bosch and the FP motors only and placed them in a compact unit with wheel (started out as a modification of last years Wildstang Omni Wheels ended up 2 were switched out for more traction, rollers were made of knurled aluminum instead of Delring with o-rings since those were instantly destroyed) all four are identical (Both BOSCHâs run the same direction) except for the center motor mount plate (and the first gear that connects to the motor, stage 2 of reduction is the same on both sets) The aluminum wheels were bolted to a yoke that was welded to the main shaft, all other gears are welded. We added in aftermarked âextruded aluminumâ heatsinks to all motors and never had a failure in 2 reigonals and nationals running this setup. As a bonus I put up the PBasic code on the codex to show how we controlled the swerve drive with 1 joystick. To mount these drive units we welded a 2" dia. tube to the top of each drive unit, and put a recieving tube on the chassis that rotated and stayed aligned. A single bolt was all that was required to remove the drive unit and replace it if anything went wrong. I have pictures if anyone wants them
My team is coming up on its third year as a FIRST robotics team, and i found myself thinking about how we could not use the simple drill motors to power our massive machine next year. looking at alot of robots this year at competition, i noticed that they are using their own gearboxes. All im asking for is a good reference on how to make your own gearbox. since my team doesnt have any engineering teams to back it up i was hoping to find out how we could do it on our own. thnx for your help.