Placeholder Image

字幕表 動画を再生する

  • The first stationary bike was developed by a London physician in the late 18th century to

  • exercise the joints of patients suffering from gout, rheumatic disorders or other

  • afflictions. The modern stationary bike is all about helping people stay fit to prevent

  • illnesses. On this stationary bike, magnets linked to the flywheel create tension that

  • causes the cyclist to push harder, making the workout truly an uphill battle.

  • Production starts with steel tubing for the base.

  • A probe locates the center of the tubing.

  • This reference point allows a computerized laser cutter to find the exact spots to cut

  • assembly holes with the assembly holes cut.

  • The laser slices the tubing to the correct length.

  • An automated system retrieves the part and transfers it to a holding area.

  • A worker inserts screws in the base part, which will attach it to the main frame.

  • He pipes sealant around the screws.

  • Another worker now arranges the three tubular base parts in a welding fixture and

  • clamps them in place.

  • The fixture revolves and meets up with a robotic welder.

  • The robot welds the three parts together.

  • This completes the base of the stationary bike.

  • The bike's mainframe has been configured on the other side of the welding fixture.

  • The robot welds these parts together.

  • The fixture rotates to serve up another base assembly to the robot, and the worker

  • collects the welded mainframe from the reverse side.

  • He grinds the welded seams smooth and gets rid of burrs on the steel.

  • Workers sandblast the metal, wash it, and apply primer.

  • After grounding the mainframe, another worker sprays electrostatically charged resin

  • and pigment onto it.

  • Once it's baked on, this powder coat will provide a protective finish.

  • At another station, a 55 ton press punches holes into posts for the bike's handlebar and

  • seat. The holes are for adjusting the height of these parts.

  • Next up is the casting for mounting the handlebar to the post.

  • Using another press, the worker entrenches the top of the post in the casting.

  • He taps the casting with a rubber mallet to tweak the installation and sets the assembly

  • aside. At another station, a worker arranges numerous seat posts in tight alignment.

  • He drapes a stencil of sequential lettering on top of the posts.

  • He dips an etching wand in a chemical solution and then moves it over the letters

  • five times.

  • This burns the letters into the steel, providing markers for height adjustment.

  • An assembler drives a wedge into one of the bike's two crank arms to create a hole that

  • the axle will fit into.

  • He checks the depth of the hole with a gauge.

  • He inserts the end of the axle in the hole and, using a press, pushes it into place.

  • He measures the hole from the other side of the crank arm, and confirms that the axle has

  • been set to the correct depth.

  • He then bolts the assembly to a precise torque.

  • He locks the crank arm assembly in a lathe.

  • He slips a foam sleeve over the axle to protect it from shards of flying metal.

  • As a tool machines the part of the crank arm that will ultimately hold the bike's pulley.

  • Another member of the team now assembles bearings to a wheel hub.

  • He slides two bearings with a spacer in a press.

  • He heats the hub in an oven, causing the metal to expand.

  • The machine presses the hub sandwich together.

  • As the hub cools, it shrinks for a tight fit to the bearings.

  • He installs a retaining clip in the hub to also keep it together.

  • Next up are the holders for the magnets that create resistance on the flywheel.

  • A worker places each one in a fixture to inspect the dimensions.

  • He then checks the strength of the magnets in a tester and satisfied.

  • He inserts two in each holder.

  • This metal cage pulled into position by the magnets completes the magnetic field.

  • Stay tuned for more on the making of this stationary bike.

  • The assembler installs the magnetic resistance unit so that it swings from a

  • bracket on the main frame.

  • This bracket also holds the computer board.

  • He mounts the aluminum flywheel to the axle, sliding it between the magnets and the

  • tension device.

  • He caps the flywheel hub and secures the cap with screws.

  • The torsion spring equipped cover completes the stationary bikes tension system.

  • He assembles the crank, arm and axle to the bike and installs a bearing.

  • Then the bike moves on to the next station.

  • Another worker places an alignment tool on the back axle.

  • He loops an elastic belt with grooves around the small pulley on the flywheel, and around

  • the larger crank arm pulley linking the two.

  • He inserts another tool into the crank arm and turns it to better wrap the belt around

  • the large crank pulley.

  • He then removes both installation tools.

  • He installs four flat bushings in the handlebar post.

  • These bushings make it possible for the handlebar to be raised and lowered.

  • He applies a decal with the height indicators made of a rugged synthetic

  • material. The decal encases three sides of the metal post and this protects it from

  • abrasion. He bolts the second crank arm to the axle and torques it to the

  • specified tension.

  • Next up is the seat assembly.

  • He slides the seat stem into the post and tightens the adjustment knob to lock it in

  • place. He inserts the handlebar post into the bike frame and fishes the gear, cable and

  • communication wires through it.

  • He secures the handlebar post with the adjustment knob.

  • He connects the communication line to the resistance system's computer board.

  • He links the gear cable to the resistance system and tests its functionality.

  • Satisfied, he tightens a nut at the side to secure the cable.

  • Another worker installs a plastic cover on the drive train.

  • This will protect the cyclist's legs from the pulley system and shield the metal

  • components from human sweat.

  • For added moisture protection, she applies sealer around a welded reinforcement on the

  • bike frame. She then encases the fork of the bike with more molded plastic.

  • Bolts. Secure the casings to the bike.

  • She now places a magnetized microphone on the axle and spins the flywheel at a high

  • rpm. This is a test.

  • The bike must operate noiselessly and the decibel meter confirms the noise level is

  • negligible. She also feels the frame for unwanted vibrations.

  • She now sets the location of the magnetic resistance mechanism using a special tool.

  • This calibrates the resistance so that the handlebar computer can find it and display

  • the resistance setting during cycling.

  • Another member of the team then applies thread locking adhesive to the screw holes in

  • the crank arms.

  • He screws the pedals tightly to the crank arms and torques them to a specific setting.

  • The worker aligns the four bolt holes on the frame to the bolts on the base, and secures

  • them with cap nuts.

The first stationary bike was developed by a London physician in the late 18th century to

字幕と単語

ワンタップで英和辞典検索 単語をクリックすると、意味が表示されます

B2 中上級

Learn the Intricate Crafting of Stationary Bikes | How It's Made | Science Channel

  • 109 1
    Joy Hsu に公開 2023 年 10 月 21 日
動画の中の単語