Newsgroups: comp.robotics
Path: brunix!uunet!news.claremont.edu!jarthur.claremont.edu!bgribble
From: bgribble@jarthur.claremont.edu (Bill Gribble)
Subject: Re: Micro Motor Hints
Message-ID: <CA853q.JDB@news.claremont.edu>
Keywords: Motors etc for small bots
Sender: news@news.claremont.edu (The News System)
Organization: Harvey Mudd College, Claremont, CA 91711
References: <C9sr4x.F98@math.uwaterloo.ca> <2211viINN8si@uwm.edu> <1993Jul15.153306.7471@webo.dg.com>
Date: Thu, 15 Jul 1993 21:02:14 GMT
Lines: 24

In article <1993Jul15.153306.7471@webo.dg.com> pmalenfa@kitkat.webo.dg.com (Paul Malenfant) writes:
>Has anyone ever tried using a die/tap to put threads onto a shaft?
>I've never used one of these tools.  Do you need more clearance than
>the motor permits?  Is the shaft too hard to be cut?  Will the wheel
>be too crooked when it is screwed on?

My experience, in general, is: don't use dies, ever.  Getting a good thread
on anything with a die is difficult, and many times the threaded part will
not mate with a tapped part of the same specs.  

ESPECIALLY on something as small as a motor shaft (anywhere from 1/4'' down
to 3/32'' or so for small motors) I would not recommend a die.  A better
solution is to notch the drive shaft and put a set screw through the gear's
collar.  The set screw will hold quite well and the amount of machining you
have to do on your purchased part (i.e. the risk that you will screw up
a motor you had to pay for) is small.  

Bill Gribble


>Paul Malenfant
>pmalenfa @ kitkat.webo.dg.com (508-870-6460)


