Work Holding Devices for Shapers

Work Holding Devices for Shapers

Work Holding Devices for Shapers - Shaper work holding devices include

(i) Vices
(ii) Parallel strips
(iii) Clamps
(iv) Jack
(v) Angle plate
(vi) Vee blocks
(vii) Stop pins and toe dogs
(viii) Centres.

(i) Vices As compared to an ordinary machine vice, the shaper vice has a robust construction of the slides and moving jaw. The jaws of a shaper vice are long and deep and sufficient adjustment of the moving jaw must be provided for large work pieces to be accommodated. The jaws are usually hardened to prevent them from being distorted or marked by the work.

Shaper Vice

(ii) Parallel strips Parallel strips provide a solid support and clearance for parts with projections or steps and they raise the surface to be shaped to the proper height above the vice jaws. Parallel strips in a variety of sizes, shapes and lengths are standard equipment used on the shaper.

Parallel Strips	Shaper Work Holding Devices

(iii) Clamps For large size workpieces, which cannot be held in the shaper vice, clamps are used to hold them on the work table directly. A complete c1amping unit consists of bolt assembly, clamp and the packing or fulerum block. In a clamping arrangement, the lever principle should also be considered for proper fastening of the job.

(iv) Jack Machinist's jacks are used to support overhanging sections of castings or assemblies when they are strapped to the shaper table.

(v) Angle plate The angle plate is made up of cast iron, Angle plate is a fixture; one side of the plate is bolted to the table and the other side is bolted to the workpiece,

(vi) Vee block Vee blocks are made up of cast iron or steel. Round work that is too small in diameter to be machined while resting on the ways of the vise can be held in horizontal alignment (parallel with the vise table) by means of Vblocks. The shaper tool reciprocates between the two Vee blocks and thus cuts keyway or groove on the round workpiece.

Vee Blocks

Stop Pins and Toe Dogs

(vii) Stop pins and toe dogs Stop pins and, toe dogs are used to, hold thin work A stop pin can be inserted in the slots in the table on each side of the work, and the dogs forced against the work by tightening the stop pin screws.