| RC Crawler How-To |
1 x 6 wood
One piece at 14-1/2" You could narrow that a little
Two pieces at 4-1/2"
One piece at 14-1/2" You could narrow that a little
Two pieces at 4-1/2"
Here the side pieces are slotted for the arm holes
I used a 3/8" slot for mine at 1-5/8" long
Depending on the width and thickness of the arm
material, the slot size may need adjusted
I used a 3/8" slot for mine at 1-5/8" long
Depending on the width and thickness of the arm
material, the slot size may need adjusted
Now to bevel the slot.
Set the depth so about an
1/8" is left un-beveled.
1/8" is left un-beveled.
For later on, I made my swivel joint to arm
adapters out of 1/2" x 1/2" x 1" aluminum.
For most of my aluminum, I get it at
http://www.onlinemetalsupply.com
or else http://www.yarde.com/cgi-bin/dropzone.pl
adapters out of 1/2" x 1/2" x 1" aluminum.
For most of my aluminum, I get it at
http://www.onlinemetalsupply.com
or else http://www.yarde.com/cgi-bin/dropzone.pl
On my early ones, I scribed the center. I later on made a jig piece to it much easier and faster. The ends are tapped for a 5/16" bolt thread and the side
for a 1/4" bolt thread (mainly due to using a 1/4" x 1/2" long bolt, couldn't find a shorter 5/16" bolt less than 3/4" and didn't want to cut them down.
for a 1/4" bolt thread (mainly due to using a 1/4" x 1/2" long bolt, couldn't find a shorter 5/16" bolt less than 3/4" and didn't want to cut them down.
I made special motor mounts out of 1-1/4" x 1/8"
square aluminum tubing for the 150 rpm 12 volt
motors found at http://www.surpluscenter.com
The motors had metric bolts, so I drilled them out
bigger to slip 8-32 x 1" machine screws thru
square aluminum tubing for the 150 rpm 12 volt
motors found at http://www.surpluscenter.com
The motors had metric bolts, so I drilled them out
bigger to slip 8-32 x 1" machine screws thru
Here, the 5/16" swivel joints
from http://www.mcmaster.com
item 6072K63 are welded to
the motor shafts.
from http://www.mcmaster.com
item 6072K63 are welded to
the motor shafts.
| Parts list: For either Mk II or Mk III version Transmitter - search on ebay for Vex transmitter, All Electronics is sold out Receiver - I used a GWS 75mhz receiver on channel 89 Motors - SurplusCenter.com items 5-1581-L and R 2 ESCs - Traxxas XL-1, these seemed the most quiet for the price Battery - 7.2 volt RC car type Battery Y splitter swivels - McMaster.com item 60645K131 aluminum metal - got mine from onlinemetalsupply.com as the yarde.com dropzone minimum has gotten too high. For the upper arms I used 5/16" x 1-3/8" last time I ordered. The motor mounts was 1/8"x1-1/4"x1-1/4" square tubing. The swivel to arm adapters were 1/2" square aluminum bar stock. You may need to adjust. 1 x 6 wood some 8-32 machine screw and nylok nuts Mk III version additional parts only forearm swivels - McMaster.com item 60645K431 5/16 - 24 x 2 feet threaded rod 90032A030 |
This was the last of the pics I
took when I was building some
the last time.
took when I was building some
the last time.
