Plate-Loaded Machines

Plate-loaded (a.k.a. leverage) machines guide the movement like a selectorized machine but are loaded with weight-plates on pegs instead of a pin-selected stack. Brands like Hammer Strength popularized them.

Pros

• Free-weight-like resistance — loaded with iron, they "feel" heavier and more natural than a cable stack; resistance can rise near the top via leverage/cam geometry (see variable-resistance).
• Often independent arms — each side moves separately, exposing left-right imbalances like a dumbbell while keeping a guided path.
• Heavy loading with the safety of a fixed path and easy entry/exit (e.g., leg press, chest press, rows).
• More durable and serviceable than cable mechanisms.

Cons

• Slower to change — you must load/strip plates each set.
• Footprint and cost — large, expensive; commercial-gym staple.
• Still a guided, largely single-plane path with limited stabilizer demand vs. true free weights (see free-weights-vs-machines).

These bridge the gap between machines and free weights — guided and safe, yet heavy and natural-feeling.

• Loaded with barbell plates on pegs; leverage/cam guides the path.
• Feel more like free weights than pin stacks; often have independent arms.
• Allow heavy, fixed-path loading; safe entry/exit.
• Slower to change than pin machines; large and costly.

• selectorized-machine — pin-stack counterpart.
• weight-plates — what loads them.
• leg-press — a common plate-loaded machine.
• free-weights-vs-machines / variable-resistance — comparison and cam mechanics.