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View Full Version : Where can I find gears?

vivek16
11-05-2008, 17:45
Well, 20 pressure angle, 32 pitch gears to be exact. keyway or hex broach would be nice for the drive shaft.

thanks, Vivek
CraigHickman
11-05-2008, 17:47
Martin Sprocket, Mcmaster, or Sdp-si.

EDIT: Also Boston gear. I personally use Martin, and have never had an issue with a correctly ordered and chosen part.
AdamHeard
11-05-2008, 18:00
AFAIK, AndyMark is the only reasonably priced supplier of 20DP hex broached gears I have found.

If you can, I would design your gearbox entirely around AM gears (If you look at the gear page, there are a lot you can use for some great prices).
vivek16
11-05-2008, 18:16
Adam, I need 20 pressure angle not dp. Sorry about that( I had a typo in the starter post).

thanks, Vivek
JVN
11-05-2008, 19:40
I've had great luck with Boston Gear components in the past.
You will need to find a distributor close to you. This is slightly more inconvenient than McMaster's "buy it and it appears the next day" system, but working with a sales rep from a local distributor can have its perks (maybe a discount on your parts).

Good Luck,
John
Brandon Holley
12-05-2008, 09:57
I've had great luck with Boston Gear components in the past.
You will need to find a distributor close to you. This is slightly more inconvenient than McMaster's "buy it and it appears the next day" system, but working with a sales rep from a local distributor can have its perks (maybe a discount on your parts).

Good Luck,
John

We managed to have a local supplier donate boston gears to us this year.
tennispro9911
12-05-2008, 13:24
What about aluminum gears?
Tristan Lall
12-05-2008, 14:10
Back in the days when the Bosch/Scintilla drill motors used (metric) 0.7 module gears, we used to order the mating gears from PIC Design (http://www.pic-design.com/). They had some issues with promptly shipping orders (probably because the gears we wanted were non-stock), but the parts were always of good quality.

They sell 303 stainless steel and 2024-T3 aluminum gears in smaller Imperial pitches and metric modules (24 DP, 32 DP, 0.8 module, 0.7 module, 0.5 module, etc.).

They also have a good (but expensive) selection of high-precision bearings (FIRST robots aren't likely to benefit from anything beyond ABEC-3, and ABEC-1 is more than sufficient for many jobs).
Cory
12-05-2008, 16:12
What about aluminum gears?

For all practical purposes (anything but low load areas) you won't find off the shelf aluminum gears.
chessking132
12-05-2008, 16:24
I know my team buys allot of our stuff from here http://www.mcmaster.com/. I am not sure if they have what you looking for but it is worth a shot.

Matthew Simpson
Team 75 Driver
ZsHeRm
12-05-2008, 16:44
What about aluminum gears?

remember if you use aluminum gears you cant use your gear tooth counters on it. their not magnetic... we had one of our sponsors make our 44 gear count sprokets which dropped our gear ratio to 6.35:1 but we couldn't use the gears for our autonomous.
vivek16
12-05-2008, 18:17
I tried mcmaster and they had a very limited supply of 32 pitch and 20 pressure angle. sdp-si had a huge selection and their online catalog was helpful so I stuck with them (CraigHickman's idea).

thanks for all the responses, Vivek :)

EDIT: ok, so the gears I was looking at were only 1/8 of an inch thick... I am back to looking again :)
tennispro9911
12-05-2008, 18:38
I'm looking into designing a semicustom transmission using some AndyMark Spare parts and some purchased gears that are hopefully aluminum. Any ideas?
vivek16
12-05-2008, 19:54
I'm looking into designing a semicustom transmission using some AndyMark Spare parts and some purchased gears that are hopefully aluminum. Any ideas?

aluminum gears with the kinds of torque you see in *normal* gearboxes (think toughboxes) will not hold up.
Cory
12-05-2008, 20:03
aluminum gears with the kinds of torque you see in *normal* gearboxes (think toughboxes) will not hold up.

Nothing off the shelf that is.
Doug G
13-05-2008, 00:32
AFAIK, AndyMark is the only reasonably priced supplier of 20DP hex broached gears I have found.


If you really get into gearboxes and drive trains, consider investing in nice DuMont 3/8" and 1/2" hex broaches. No more keyway craziness. I called up a DuMont rep several years ago and we worked out a deal, I bought the 3/8" broach, he donated the 1/2" and we had to place their stickers on our 2005 bot.
Andy Baker
13-05-2008, 08:38
aluminum gears with the kinds of torque you see in *normal* gearboxes (think toughboxes) will not hold up.

Nothing off the shelf that is.

We are working on some 50 tooth 6061 aluminum gears, but it is too early to see how they are performing. Yes, ideally, it would be nice if these were 7075, but they are not. We will have some results by mid-July.

Andy