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GEARS--Something all modellers should be aware of---

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  • GEARS--Something all modellers should be aware of---

    I have recently been on a quest for gears to use on my models. This is something that I didn't know about. Pretty well all battery powered powertools have a whole whack of gears in them, and they are all excellent sizes for use in model engines. ALL of the disassembled gears in the attached picture came out of ONE power drill. They combine into one nest of planetary gears, similar to the assembled stack that I have shown. I went over and did a little creative begging at the local tool repair shop, and he gave me a whole basket full of these things, just for asking---they were destined for the garbage pickup.---Brian

    Brian Rupnow

  • #2
    Yep, And the better ones will handle up to around 1hp! The robotics guys have been using these planetary sets for a while now.

    This is my 3 speed planetary speed reducer for the horizontal line boring mill I am building. It has very low friction and is very rugged. I built it with triple input bearings and dual output bearings. Bronze bearings for the clutch and the high speed ratio. All the gears are from a cordless Makita hammer drill that was being thrown out by my brother in law since the batteries were no longer holding a charge.

    Steve

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    • #3
      SJH--You sir, are a far braver man than I. Damn, I thought I was pushing the envelope just building a little gear reducer for my model steam engine---
      Brian Rupnow

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      • #4
        You would be suprised what a skate board and a 14v cordless drill will move across the ground.

        Another place to look are corded tools,drills of course.Side grinders have bevel gears and sometimes spiral bevel gears.Can openers and ice cream freezers are also targets.
        Last edited by wierdscience; 12-16-2008, 10:36 PM.
        I just need one more tool,just one!

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        • #5
          I ripped apart an old garage door opener. Got me a nice big motor (1/2 HP? Sounds like homebrew machine power) but all the gears were trashed. I also opened a bread machine. 1 nice AC motor for a toolpost grinder, a fan motor, but not gears.

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          • #6
            Another source of planetary gears would be the gear-reduction starters used on many late-model cars. Depending on the model, you'll find both metal and plastic ring gears.

            Roger
            Any products mentioned in my posts have been endorsed by their manufacturer.

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            • #7
              Funny, right at this moment I'm looking for a source of planetary gears- but what I need can't be more than 3/4 inch total outside diameter. I have a set from an old beta vcr that might work, I just have to find it. Plastic of course, but good enough for this project. Most vcrs are a source for several gears, including worm gears. Used to be that you could find lots in surplus type stores, in equipment of some kind. I can just imagine that a bomber sight would have lots of gears-

              Pricey probably, but there are sets of planetary gears made for model electric motors. I doubt anybody would have much luck scrounging those, but maybe. Even cheesy cordless screwdrivers have planetary gearsets. When it comes to bevel gears, they're a little harder to find, at least for me. But they are available as parts for r/c models, and not too badly priced in some cases. I found a set of differential gears that are sintered and look pretty strong at least, for not too much moolah. I need to make another trip to the model wholesaler- found several sizes of ball bearings there for reasonable cost, all replacement parts for r/c models.
              Last edited by darryl; 12-17-2008, 02:58 AM.
              I seldom do anything within the scope of logical reason and calculated cost/benefit, etc- I'm following my passion-

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              • #8
                Look for a ten turn potentiometer knob. They have a cute little planetary set built into the knob.
                Free software for calculating bolt circles and similar: Click Here

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                • #9
                  I ripped apart an old garage door opener. Got me a nice big motor (1/2 HP? Sounds like homebrew machine power)
                  That motor isn't much good for anything. Garage door opener motors have a duty cycle rating of about 1 percent. You can't run one for more than a minute or so before it overheats. They are designed for one specific job; Run for 15 seconds and then wait a minute and run for another 15 seconds and then do nothing for hours.
                  Free software for calculating bolt circles and similar: Click Here

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                  • #10
                    Originally posted by winchman
                    Another source of planetary gears would be the gear-reduction starters used on many late-model cars. Depending on the model, you'll find both metal and plastic ring gears.

                    Roger
                    I have had two of these starters apart lately and they didn't have planetary sets. In fact the gear ratios weren't much more than 1:1. Guess they just wanted the offset. One was for a Toyota about 2.0 L, and the other a 3.9 Cummings diesel. Could you give examples of starters with planetary gear sets?

                    More photos of those cool winches please.

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                    • #11
                      Damn, I thought I was pushing the envelope just building a little gear reducer for my model steam engine
                      Oh heck no. This little triple planetary set can deliver some serious power for it's size! With the stock motor it delivered 560 oz/in torque.
                      This is the tool it came from!- http://www.homedepot.com/webapp/wcs/...01+501461+1240

                      Steve

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                      • #12
                        Here's a DeWalt powered tow bar for small aircraft:

                        http://www.littlestarproducts.com/de..._id=&apage_id=

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                        • #13
                          GKman, my 1999 Olds Intrigue 305 V6 is planetary.

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                          • #14
                            I bought two HF batt drills for a insect walker robot..

                            HOW to get the chuck off them without destroying the shaft? I designed it around the motor head and battery.. not the chuck..

                            There is a hidden screw in the center.. but.. it must be pressed on while hot or?? I put enough on it with a home made puller to piss me off.. if I trash one??

                            Anyways they sell the drills for less than a battery.. Or did..
                            Excuse me, I farted.

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                            • #15
                              Old Mopar starters often were planetary, but I'm not sure if that was universal. I've run across a few Japanese planetary ones. The Jeep Cherokee has one, and a Nissan 200SX I recently dealt with also had one. Expensive little things they are, too.

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