Robot Quick Build Session

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Robot Quick Build Session
Frame Assembly InstructionsProduced byEd
Latimer, Team 476Ken York, Team 476Ron Markum,
Team 1750Special Thanks to Oklahoma State
UniversityCollege of Engineering, Architecture,
and Technology
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Frame Assembly Instructions
Step 1 Watch the instructional video(s) for
assembling the C-base frame on www.andymark.biz S
tep 2 Proceed with putting the frame together.
You can use the video(s) in pause mode, or you
can use this presentation. You will make a 27
wide x 37 long kitbot frame.
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Final Product Picture You will be making a 27 x
37 robot 27 front and back, with 37 sides
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Have 2 of the 6 rails cut at the cutting
station to make them 27 long. There is a
reference hole marking this location on each
rail.
File the ends after they are cut.
Save the 8 cut pieces for this years robot ..
This is what you should have 4 original rails,
2 rails cut to 27
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Notice The orientation of the bracket is not
correct in these PowerPoint slides. See the
andymark.biz video.
Insert the frame connectors into the end holes of
the 4 long rails (not the 2 cut ones) until you
can get a 1.75 long frame bolt through the
ears on the connector. It is a tight fit so
you might have to tap them in.
Put the nylock nuts on but do not tighten them
yet.
Repeat for both ends of all 4 long rails. Leave
the nylock nuts loose.
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Long rail
27 cut rail
This frame connector goes in the 4th and 5th
holes from the end of the cut rail.
Install Nylock nuts but do not tighten.
Repeat to assemble the inner frame. When you
are done it should look like this.
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Use a non-mar hammer for the bearings if not
available, cushion the hammer taps with a block
of wood or similar material.
Make sure the bearings are bottomed-out in the
wheel hub recess. They should only stick out
about 1/8 inch.
Be sure and add the spacer! It will keep the
chain from rubbing the wheel.
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Use a low clutch setting on the drill to
avoid stripping the threads in the plastic.
Self-tapping 10-24 screws, 1 long (from
the sandwich bag) 3 per wheel is sufficient.
You only have to put sprockets on 2 wheels today,
but you can put all 4 on if you think you want to
try 4-wheel drive later.
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End rail
Long outer rail
Long inner rail
Short spacer
Long spacer
Gather these parts.
Make sure the sprocket faces the inside of the
frame (Note You cannot see the sprocket in this
view)
Assemble the other wheel, reversing the spacers
if you intend to try 4-wheel chain drive later.
If not, the spacer order does not matter as long
as you use one long and one short.
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Push the frame connectors into the end rails and
bolt them up.
Note If the frame connectors on the long rails
do not go in far enough to get the frame bolts
through, you may not have driven the wheel
bearings in all the way. Disassemble and correct.
Tighten all the frame bolts!
Notice the staggered sprocket pattern of the two
wheels to allow for optional 4-wheel chain drive
later.
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Attach the transmissions using the short ¼-20
screws and put the nylock nuts on loose. The
exact location of the transmission box on the
frame is not critical but it should be 1/3-1/2 of
the way down the frame for this lay-out. You can
change this at a later date if you want. Note
There should be left and right transmissions
made so that the motors are both towards the
center of the robot for better weight
distribution. But this is not critical.
Motor closer to the center of the robot.
Late Change Loosen these two bolts so the angle
bracket is loose during installation. See the
andymark.biz video.
Push to the end of the slot.
Measure where the chain needs to be cut drape
the chain over both sprockets, slide the
transmission to the end of its slots, and
identify the link to cut. If you have never
measured or cut chain before, ask a mentor to
help you.
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Use a 3/8 chain break to cut the link.
It should look like this after using the chain
break.
Drive the pin out the rest of the way with a
punch. This is best done over the open jaws of
a vise if you have one if not, one of the holes
in the frame will do.
Here is the chain cut in two.
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Install the chain over the two sprockets and
connect it using a master link. Have a mentor
help you if you have never done this before.
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Push the transmission box to tighten the chain
and then tighten all 4 bolts.
Repeat for the other side, remembering it is
preferred to have the motors face each other and
be towards the center of the robot. If your
transmissions are not left/right this is OK as it
is only for better weight distribution. If you
want, you could have the Transmission Team change
the motor orientation its not that hard.
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Finished robot frame below. You cannot continue
until the Electronics Team is ready with their
board.
Note Hold onto the (3) ¼-20 x 1.75 bolts and
Nylock nuts that were in your sandwich bag.
You will need them to help mount the electronics
board to the frame.