RS Pro adjustable parallel set, used for checking, marking or positioning work. Consist of two precision ground pieces which slide smoothly on each other.
Features and Benefits
Parallels consist of 2 piece dove tailed together Locked in place by set screws Can be set to a micro meter for size
Specification
Set of 6 Parallels 3/8"-2 1/4" (9.5 - 57.2 mm)
Supplied with
Vinyl pouch
Parallels, Surface Finish & Hardness
Surface Finish
Any machined component has a surface geometry which consists of three basic elements:
Form or Curvature - Whether the surface has irregular bumps or dimensional changes Waviness - Whether the surface has regular repetitive ripples or patterns (e.g. milling patterns) Roughness - The shapes or irregularities that are smaller than, and form part of the waviness pattern (e.g. material micro-structure)
Waviness and roughness are traditionally the most difficult elements to measure when comparing surface finish, however, they have a radical effect on the performance of the finished component. Variations will cause aesthetic appearance changes, component wear variations, oil retention variation etc. Many manufacturers therefore specify a range of roughness values which their components should be manufactured to, often expressed as: Ra, Rq (RMS), RzDIN, Ry, Sm,mm.