Re: AFV of the Month for February 2004

[Frank Pittelli <frank-at-rctankcombat.com>]

adt22-at-drexel.edu wrote:

> Fellow EV Users, I have two EV's on the way and so far the only spec
> I know for the shaft is 8mm diameter.  Is a 5/16" bore with a set
> screw the right match for this shaft? From the pictures the shaft
> looks like it was made for something with slots.   Is there anywhere
> to get  a slotted pulley/sprocket? The shaft wouldn't happen to also
> be keyed, would it? Thanks, Amir
> 
Amir,

The EVs have an 8mm hardened steel shaft, with a hole drilled through it 
that is slightly smaller than 1/8" with a spring pin through it.  The 
pair of EVs that I bought came with a roller assembly that had a steel 
bushing that was 8mm ID and 1/2" OD, with a slot on either end to mate 
up with the spring pin on the motor.

By cutting that bushing in half, I was able to use each half to mount a 
pulley/sprocket with a 1/2" bore to each EV motor.  I knocked out the 
metric spring pin and drilled out the whole to be exactly 1/8", so I 
could use a longer pin.

If you didn't get a similar bushing, you can make one by drilling an 8mm 
hole in a 1/2" diameter rod (bronze, brass, steel, or plastic) and 
cutting a slot on one end to mate with the spring pin.  Then, you can 
either pin the pulley/sprocket to the shaft (the most reliable 
attachment) or can use a set screw (through the bushing) to hold the 
pulley/sprocket in place.

Hope that helps.

        Frank P.