Where can I find gears?

[vivek16]

Well, 20 pressure angle, 32 pitch gears to be exact. keyway or hex broach would be nice for the drive shaft.

thanks, Vivek

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]

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]

Adam, I need 20 pressure angle not dp. Sorry about that( I had a typo in the starter post).

thanks, Vivek

[JVN]

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]

Originally Posted by JVN

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]

What about aluminum gears?

[Tristan Lall]

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. 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]

Originally Posted by tennispro9911

What about aluminum gears?

For all practical purposes (anything but low load areas) you won't find off the shelf aluminum gears.

[chessking132]

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]

Originally Posted by tennispro9911

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]

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]

I'm looking into designing a semicustom transmission using some AndyMark Spare parts and some purchased gears that are hopefully aluminum. Any ideas?

[vivek16]

Originally Posted by tennispro9911

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.

[Doug G]

Originally Posted by AdamHeard

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.