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DPRG: Re: gearing

Subject: DPRG: Re: gearing
From: Kevin Ross kevinro at nwlink.com
Date: Thu Jul 24 09:22:45 CDT 1997

There are many alternatives to putting together your own gearing. 

The drawbacks to 'rolling your own' when it comes to gears is that they are
horridly expensive. You will probably find that a new set of gears that
give you a reasonable gear down will cost about $30 per motor new! If you
can find them surplus, they will still run you a bunch. 

The best alternatives include surplus gearhead motors and new ones. The
surplus market, such as Marlin P Jones, AllTronics, All Electronics, and
Electronic Goldmine all have a selection of motors of various sizes. You
can find all of these companies on the net. 

New motors can be had for a decent price! Grainger Industrial Supply sells
a great 12v DC gearmotors for $22.00 (Stock # 2L010). They have a variety
of different gear ratios (this 2L2010 is 25 RPM, which is really fast on a
6" wheel!). The motor draws 1.3 amps at full load. It also outputs 20
In-Lbs (Thats POUNDS, not OUNCES!). A Dallas phone number for Grainger is
214-631-4597. I think they want you to be a business before they will sell
to you, as they really aren't a retail outfit. 

If this motor is too big, you might consider hacking a servo motor. Check
out http://www.seattlerobotics.org/guide/index.html, which has a section on
using hacked R/C servo motors for control. 


- ----------
> From: Jim Brown <jbrown at why.net>
> To: Tim Johnson <figurehead at why.net>
> Cc: dprglist at dprg.org
> Subject: DPRG: Re: gearing
> Date: Thursday, July 24, 1997 5:05 AM
> At 11:02 AM 4/21/97 -0500, you wrote:
> >Was curious, and about to dive into designing and putting together the
> >'guts' of my robot and I am trying to figure out how I am going to get
> >the gearing together.  What does a beginner do for this?  Does a person
> >normally dig for a suitable already assembled gear box?  Is the a
> >company that simply manufactures and sells gear boxes?  I will two(one
> >for each motor and wheel)  Or does a person normally just design and
> >assemble the gear assembly themselves, and if so, where is a good place
> >to begin(I haven't a clue how I would make a good reliable, smooth gear
> >assembly that wouldn't jump out of whack or rip through teeth at every
> >incline)
> >
> >I've got the electronic part figured out and I think I can manage
> >mounting the goodies into my case, but the gearing I have a feeling
> >could be a killer.
> >
> >Thanks,
> >
> >Tim Johnson
> >
> >figurehead at why.net
> >
> >http://www.why.net/users/figurehead
> The robot store has a nice gear box, but it's a little pricey  ?$20?
> http://www.robotstore.com .  You can configure it to just about
> any ratio.
> Also MECI had some nice gear boxes for about $1.99 that were
> taken from those sidewalk kids cars.  Also, you can get the
> original 12v motor with them for about ?$5.99?.
> ? http://www.meci.com ?
> I don't think I would be brave enough to build a gearbox from
> scratch, although I've contemplated it myself several times.
> It's probably loads easier to find a gearhead motor through
> a surplus store than to build one.
> >PS are you still with Why Net?
> Yep, I tried to quit but they won't let me out of my contract
> so I'm stuck.  So, I'm enjoying reporting to !every! problem
> to support at why.net.
> -------------------------------------------------------------------------
> Jim Brown       jim_brown at bigfoot.com or
>                 jbrown at spdmail.spd.dsccc.com or jbrown at dprg.org
>                 http://users.why.net/jbrown
> Rom 3:23,24     http://www.dprg.org (next meeting is Aug 9th) Bring
> 		Robotics Contest at the Aug 9th meeting!


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