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Difficulty: MediumGripping and Holding Tools

A craftsperson needs to clamp two hardwood workpieces with non-parallel, angled mating surfaces while glue cures, requiring broad clamping pressure without indenting the wood. Which holding tool features two rectangular wooden jaws controlled by dual independent threaded spindles to accommodate tapered angles?

  1. A
    C-clamp
  2. Hand-screw clampAnswer
  3. C
    Pipe clamp
  4. D
    Bench vise

Answer

Hand-screw clamp
The hand-screw clamp is specifically constructed with two broad hardwood jaws linked by two independently adjusted steel screws. Turning the middle and end spindles to different lengths allows the wooden jaws to angle relative to each other, maintaining full-surface contact on tapered workpieces while protecting delicate wood grain from pressure dents.

Step-by-Step Solution

1
Analyze the workpiece geometry and material constraints specified in the scenario.
The workpieces are made of hardwood, have non-parallel (angled/tapered) surfaces, and require wide, non-marring pressure distribution.
Selecting the correct holding tool requires matching its jaw design and mechanical action to the specific angle and surface sensitivity of the workpiece.
2
Evaluate the mechanical operation of dual-spindle holding tools versus single-axis clamps.
The hand-screw clamp uses two independent counter-threaded spindles that allow the wooden jaws to pivot and lock at offset angles while distributing clamping force across broad wooden faces.
Standard clamps like C-clamps and pipe clamps maintain fixed, parallel jaw faces and cannot conform to tapered stock without slipping or damaging the material.

Key Concept

Hand-screw clamps provide adjustable, non-marring clamping across non-parallel and tapered workpieces through two independently adjustable threaded spindles.
Estimated Time:1m 0s
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Topics

Gripping and Holding Tools

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