FIGURE 3. Ti axle
using a die to thread.
FIGURE 5. Drilling
out the pulley.
FIGURE 4. Ti axle threaded with nut.
FIGURE 6. Machining
off the hub.
that 3 mm pitch HTD x 6 mm wide
belts work well in Beetle class bots.
A good source for pulleys and belts
is www.sdp-si.com. You can also
get custom pulleys from
www.fingertechrobotics.com.
On the original version of Weta,
I used a 40 tooth pulley. I have since
moved to the 30 tooth shown in the
downloadable drawings from the
article link.
FIGURE 7. Pulley and
flange on bearing.
FIGURE 8. Pulley
on beater bar.
SERVO 08.2011 29
