What does a trunnion do?

A trunnion (from Old French “trognon”, trunk) is a cylindrical protrusion used as a mounting or pivoting point. First associated with cannons, they are an important military development. Alternatively, a trunnion is a shaft that positions and supports a tilting plate.

How does a trunnion bearing work?

Trunnion bearings are very specialized bearing mechanisms. Sometimes, a shaft not only has to rotate, but the assembly connected to the shaft has to rotate as well. … Your shoulder joint is a trunnion bearing. Its a a ball-and-socket assembly, allowing your arm to rotate freely but still be firmly attached.

What is a trunnion on a valve?

A trunnion mounted valve means that the ball is con- strained by bearings and is only allowed to rotate, the majority of the hydraulic load is supported by the Sy- stem constraints, resulting in low bearing pressure and no shaft fatigue.

What is a suspension trunnion?

TRUNNION – FREE MOVEMENT SUSPENSION

The trunnion allows the spindle to rotate when the vehicle is steering, and allows for up-down movement of the control arms at the same time. Trunnion assemblies have been phased out in favor of upper/lower ball joints.

What is mill trunnion?

The Mill Trunnion Liner fits inside the bearing to protect it from wear caused by the ore being washed over the liner and through the bearing as it is fed to or discharged from the mill. … The seal is bolted over the end of the trunnion liner. This is to allow the feed chute to come down through this hole into the mill.

What is a bridge trunnion?

A trunnion is the axle at the top of each tower of the Interstate Bridge that supports the weight of the bridge and counterweights to help raise and lower the lift span. … One of the reasons is that a lower river = more “headroom” for ships to fit under the bridge while we replace the bridge lift system.

What is a bandsaw trunnion?

Trunnions allow the table’s axis of tilt to be aligned with the surface of the table so that the top of the table doesn’t move side-to-side with respect to the blade as it’s tilted. But if you are building this bandsaw, a temporary table is necessary so you can use the bandsaw to cut the trunnions for the actual table.

How do you pronounce trunnion?

What do you call a bridge that opens for boats?

A bascule bridge (also referred to as a drawbridge or a lifting bridge) is a moveable bridge with a counterweight that continuously balances a span, or leaf, throughout its upward swing to provide clearance for boat traffic.

Is a drawbridge a cantilever bridge?

A cantilever bridge is a bridge built using cantilevers, structures that project horizontally into space, supported on only one end.
…
Cantilever bridge.
The Pierre Pflimlin Bridge is a balanced cantilever made of concrete, shown here under construction.
Ancestor Beam bridge, truss bridge
Descendant Swing bridge

How do trunnion bascule bridges work?

Trunnion bascule bridges have two leaves that swing vertically on large pivots. The large counter weight is hidden in the bank of the river under the bridge. This type of bridge is quick opening and does not obstruct the river with a center pier.

How are drawbridges powered?

A moveable bridge, or movable bridge, is a bridge that moves to allow passage for boats or barges. … Generally, the bridges are powered by electric motors, whether operating winches, gearing, or hydraulic pistons.

What does the word bascule mean?

Definition of bascule

: an apparatus or structure (such as a drawbridge) in which one end is counterbalanced by the other on the principle of the seesaw or by weights.

What city has the most moveable bridges?

Chicago
Chicago has many drawbridges; the most of any city in North America. And in classic Second City form, is surpassed only by Amsterdam as the city with the most drawbridges in the world. Chicago has the greatest variety of drawbridge designs of any city on earth.

How do you place a 7 day drawbridge?

What is the bridge over a moat called?

A drawbridge or draw-bridge is a type of moveable bridge typically at the entrance to a castle or tower surrounded by a moat.

How do you use powered drawbridge 7 days?

How do you place a reinforced drawbridge?

What is a Bailey in a castle?

A bailey or ward in a fortification is a courtyard enclosed by a curtain wall. In particular, an early type of European castle was known as a motte-and-bailey.

What are arrow slits in castles called?

An arrowslit (often also referred to as an arrow loop, loophole or loop hole, and sometimes a balistraria) is a narrow vertical aperture in a fortification through which an archer can launch arrows or a crossbowman can launch bolts.

Why is it called drawbridge?

The name is French, meaning ‘balance scale’. The bridge deck is made of one or more large leaves, or flat panels that lift from a horizontal to vertical position. A bascule drawbridge may have single or double lifting leaves.

What is a palisade in a castle?

palisade Add to list Share. A palisade is a heavy-duty fence that’s strong enough to keep out intruders, like one you might see around a military camp. Traditionally, palisades were built with wooden stakes around small forts or castles as a way to keep out enemies.

What did Norman castles look like?

Towers. Crenellated towers are a distinguishing feature of Norman castles. A crenellation was a parapet wall built on the top of a castle tower or curtain wall with regular gaps (known as crenels) for firing arrows and other missiles. … Crenels were smaller than merlons, giving defenders room to take cover.