Free Old Motors

[JeremyLansing]

Team 171 recently started cleaning out our shop, and we found drawers full of old FRC motors. Rather than immediately recycle them immediately, we thought we would offer them up to other teams that might be looking for them to complete old robots and what not. Below is a list of motors we have, if you are interested, pm me with your mailing info and we will do our best to send them to you.

- Globe motors
- Seat motors
- Spline shaft CIMs
- Bosch drill motors
- Mini-bike motors (the jumbo CIMs)

I have photos of some of the motors, and to my knowledge they are all in good working order. The bosch drill motors are still in the boxes and do not appear to have ever been used.

Edit: I forgot to mention, we would prefer that you pay shipping if at all possible. I know this is a bit late to mention, but shipping costs for things like these can get rather high, especially if you want a large number of motors. Thanks

[cxcad]

Are spline shaft CIMs the same as the regular CIMs? If they are do you have 4 or 5 of them? My team is working on a t-shirt bot

[Dr.Gusta]

What are the ratings on the mini bike motors? Those look like they can be a lot of fun for a non-frc bot (offseason bot)

[EricH]

Originally Posted by Dr.Gusta

What are the ratings on the mini bike motors? Those look like they can be a lot of fun for a non-frc bot (offseason bot)

Slightly weaker than CIMs, as I recall, with a touch more speed. They can work in the same gearbox as I recall.

The thing to watch out for on those is if they come with the belt assembly on 'em or not.


BTW, just so everybody's aware: Not many of those motors were FRC-legal in 2014 (Exception: seat motors if they were ARA or FIRST Choice); probably even fewer in future seasons. But for non-FRC applications, or for training, they're all pretty decent motors, as I recall.

[AdamHeard]

Originally Posted by EricH

Slightly weaker than CIMs, as I recall, with a touch more speed. They can work in the same gearbox as I recall.

The thing to watch out for on those is if they come with the belt assembly on 'em or not.


BTW, just so everybody's aware: Not many of those motors were FRC-legal in 2014 (Exception: seat motors if they were ARA or FIRST Choice); probably even fewer in future seasons. But for non-FRC applications, or for training, they're all pretty decent motors, as I recall.

The mini bike motors were ~2700 rpm, more torque than a CIM but less overall power because of their lower speed.

[JeremyLansing]

Originally Posted by cxcad

Are spline shaft CIMs the same as the regular CIMs? If they are do you have 4 or 5 of them? My team is working on a t-shirt bot

Not really, rather than an 8mm round output shaft, the shaft has splines on it. Unfortunately, all the spline shaft motors are spoken for, as well as all the globe motors. We are still working out where the mini bike motors will go, but enough people have spoken up about them that they will all be taken. We still have 4 bosch drill motors, 6 bosch drill gearboxes, and 4 seat motors.

[Tristan Lall]

Originally Posted by JeremyLansing

Not really, rather than an 8mm round output shaft, the shaft has splines on it. Unfortunately, all the spline shaft motors are spoken for, as well as all the globe motors. We are still working out where the mini bike motors will go, but enough people have spoken up about them that they will all be gone soon. We still have 4 bosch drill motors, 6 bosch drill gearboxes, and 4 seat motors.

The CIMs with the unusual shaft aren't actually a spline; they're a 25° pressure angle involute gear. Search for Atwood motors on ChiefDelphi for more information.

http://www.chiefdelphi.com/forums/showthread.php?t=1457
http://www.chiefdelphi.com/forums/showthread.php?t=2262
http://www.chiefdelphi.com/forums/showthread.php?t=2208

[JeremyLansing]

Originally Posted by Tristan Lall

The CIMs with the unusual shaft aren't actually a spline; they're a 25° pressure angle involute gear. Search for Atwood motors on ChiefDelphi for more information.

http://www.chiefdelphi.com/forums/showthread.php?t=1457
http://www.chiefdelphi.com/forums/showthread.php?t=2262
http://www.chiefdelphi.com/forums/showthread.php?t=2208

Well, I guess you learn something new every day. How long were these around in the kit of parts? Those threads are from 2002, were they used any other year? Did people use the "built in" output shafts much, or did they typically stick something else on top of it? 36 diametral pitch seems like it would be difficult to source parts for, especially before the proliferation of FRC specific suppliers.

[Tristan Lall]

Originally Posted by JeremyLansing

Well, I guess you learn something new every day. How long were these around in the kit of parts? Those threads are from 2002, were they used any other year? Did people use the "built in" output shafts much, or did they typically stick something else on top of it? 36 diametral pitch seems like it would be difficult to source parts for, especially before the proliferation of FRC specific suppliers.

The Atwood version of the CIM was only in the 2002 kit; teams received a matching cluster gear, which they often modified to suit their gearbox arrangement. Some also bought trailer jack kits to get further matching reductions. The motor gear is ridiculously difficult to match with off-the-shelf gears, not so much because of the pitch (because 36 diametral pitch is fairly close to 0.7 module,¹ which is available—though not always reliably or cheaply—from a couple suppliers), but because of the 25° pressure angle (20° is common for metric gears; 14.5° and 20° are common for Imperial gears). Note also that 2002 rules were very restrictive about which suppliers could be used. No matching gears were available from Small Parts (now Amazon Supply), and no other finished gear vendors were permitted. Gears could be cut from stock that was on the permitted additional hardware list. I believe custom gears cut by wire EDM were used by several teams.

From 2003 onward, versions with an Ø8 mm shaft were provided. (There are actually several almost-identical versions, depending on the year. Some differ in part number, because CIM makes them either for FIRST or for vendors who cater to several markets; some versions are physically different, mainly in the keyway profile.)

¹ The pitches (36 vs. 36.2857) are close enough to probably work with a centre distance adjustment, but not exactly ideal.

[nathannfm]

You can post the ones you have left in this Facebook group, I am sure they will be gone in no time.

https://www.facebook.com/groups/frcgaragesale/

[JeremyLansing]

Originally Posted by nathannfm

You can post the ones you have left in this Facebook group, I am sure they will be gone in no time.

https://www.facebook.com/groups/frcgaragesale/

Thanks, but actually they are all gone. I will be contacting everyone who sent me a pm to let them know what we can send them. I am still pretty amazed at how fast people acted. Thank you all!