Motoring Along

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Motoring Along

• ITEA/CATTS Foundation of Technology Course
  Activity

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• Drilling/Boring Tools
• Drill Press
• Hand Drill
• Drill Bits

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Drill Bits
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Hand Drill
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Measuring/Marking Tools
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Clamp/Vise
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Cutting/Shaping Tools
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Driving Tools
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Shaping/Forming Tools
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• Challenge Design and construct a direct current
  electric motor, with a maximum of eighty feet of
  magnet wire, which will run on the least amount
  of electricity after starting.
• Design and Construction Specifications
• Only materials provided in my class may be
  used for initial design
• The maximum voltage to be used is 12 VDC
• The maximum amperage to be used is 1.5 amps

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1-1/2
Using the measurements provided, layout the
location of the holes to be drilled in the block.
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Using an awl, mark the holes to be drilled.
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Make sure a ½ drill bit has been inserted into
the drill press.
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Using a ½ spade bit, drill the pilot holes for
½ dowel amature posts to a depth of ½.
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Using the ½ dowel provided, cut the dowel to
make two 2 pieces.
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Using a 5/16 twist drill, drill a hole ¼ from
one end of each of the 2 x ½ dowel pieces.
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Mark and cut a 2 piece from the metal provided.
This is for the armature.
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Mark and drill the center of the armature.
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Measure and cut a 6 rod from the metal provided.
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Slide the armature 2 down from the end of the 6
metal rod. Tap to secure the armature.
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Wrap the armature with masking tape to form the
metal core.
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Measure a 6-1/2 metal strip.
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Cut the marked metal strip with a coping saw.
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Mark ½ and 1-1/2 from the edge of the metal
strip. Center punch the location of the screw
holes.
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Drill through the metal strip using a 1/8 twist
drill
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Mark 2 from each end of the metal strip.
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Using a vise and a hammer, carefully bend the
strip at the lines marked to form a U shape.
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Using black electrical tape cover the middle
section of the U to act as an insulator when
winding the coil.
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Measure out 40 of magnet wire by wrapping the
board 39 times.
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Leaving 2 of magnet wire extending at the center
of the armature to connect to the commutator,
wrap the 40 of magnet wire tightly and uniformly
along the length of the armature. Leave an
additional 2 extending to connect to the second
pole contact of the commutator.
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Leaving 8 of wire free from each end, neatly and
tightly wind the remaining 40 of magnet wire to
the field coil.
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Attach the field coil to the motor base block.
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Cut a 1 section of ½ dowel. Drill a 1/8 hole
through the center.
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Use the copper tape provided to cover the two
halves of the commutator. Make sure to leave gaps
between the two halves.
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Using a glue gun attach the copper to the
commutator.
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Strip the ends of the magnet wire.
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Push the assembled armature coil and motor shaft
through the center of the commutator so that it
seats against the face of the coil with the
magnet wire extending over the copper pieces.
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Using flux, solder each of the extended wires to
the coil pieces of copper.
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Cut the milk straw provided and position the
piece over the armature shaft and through the
holes in the dowel supports to act as bushings,
allowing the armature to rotate freely.
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Position the armature assembly through the dowel
support posts position 2 washers on the outside
of the dowels the washers will be used to hold
the armature assembly in place, centered in the
field coil.
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Re-form paper clips provided to form the
commutator brushes. Attach to motor base block.
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Scrape the insulation coating from the ends of
the field coil lead wires. Loosen the commutator
brush screw and securely wrap one of the field
coil leads around the screw.
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Using another of the screws provided, securely
wrap the second of the field coil leads around
the screw and screw it in the hole drilled in the
wooden base block.
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Attached pulley system to the end to the
commutator end of the armature shaft.
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Connect the power supply to the motor as
illustrated. Carefully rotate the armature to
ensure it moves freely and the brushes lightly
touch the commutator continuously.
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Special thanks to Mr. Ryan for assisting me with
the photographs. Credit for the development of
this activity Mr. Robert Gray, Lead CTE
Consultant, MCCTES, Baltimore, MD Mr. Christopher
Gray, Technology Education Educator, Howard
County Public Schools, Columbia, MD Mr. Gary
Boats, Consultant, MCCTES, Baltimore, MD