1977 - The Year it all Started
||851 Farm Tractor
|852 Sky Copter
||853 Auto Chassis
the Technic parts were new in 1977! The basic set of
shown to the right. This comprises all of the new
were included in the sets, but does not include the motor or
box which were available as an accessory pack.
Beams & Plates
The "standard" Technic parts, which have now become ubiquitous, are the plate and the beam. Beams are just like 1x bricks, but have perpendicular holes at points midway between the studs. Technic plates are just like regular 2x plates, but have parallel holes at points midway between the studs. These holes are sized to accept either pins or axles. Beams originally came only in even lengths: 2, 4, 8, and 16. Plates came only in 2x4 and 2x8. Many more sizes would later be available. Studded beams are still in use though they have mostly been replaced by links.
Most technical functions were and still are accomplished with gears. In 1977, there were three sizes of spur gears (gears which transmit torque on parallel axes): 8 tooth, 24 tooth, and 40 tooth. The two larger gears also have axle holes and stud holes off the center which allow them to be used for other purposes (such as a crankshaft). There was also a 24 tooth crown gear which could be used as either a spur gear or a bevel gear (gears which transmit torque on perpendicular axes), and a rack gear. The 8 tooth gear is still in use, but the others have been replaced with improved versions. The 40 tooth gear still exists but has been used in very few sets.
Axles are the basic unit of torque transmittal in Technic. LEGO chose to use a cruciform cross section. This has the advantage of never slipping, being easy to assemble, and centering well in a hole. Axles are the same size as a stud in diameter, and originally came in only even lengths: 2, 4, 6, 8, 10, and 12, and they were always black. These are all still in use although the 2 axle has been modified and odd lengths are now available, as are other colors.
Connectors and Special Parts
The bushing was used as either a spacer or a retainer and fit onto an axle. The pin was frictionless and was used to joint two beams or as a pivot. The connector fit onto the end of an axle and included a perpendicular hole which would accept a pin. It could also be used as a connecting rod for the piston. The universal joint connected two axles and allowed rotation around axes angled apart as much as 45 degrees. The pulley was used only as a crank in 1977, but would later also be used with belts. These parts could all be used in multiple applications, but only the piston had a single use. The 2x2 square piston was used for engines, and had to be used with a connector element. At this time, these parts were available only in light gray.
Wheels and Tires
LEGO® already had lots of wheels and tires, but they were not big enough for some of the new sets. A new 24x43 wheel was introduced with a dense foam tire. This tire was later available in other sizes, and would eventually be replaced by all rubber tires.