Planer Work Holding Devices
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Planer Work Holding Devices
Planer Work Holding Devices - Since heavy cuts (as much as 25 mm) are taken at 18 to 30 m/min on a planer, the workpiece must be solidly fastened to the table. Since the workpiece is unusually heavy and must be reciprocated, it must be fastened \ to not only resist the cutting forces but also the high inertia forces that result from the rapid acceleration changes at the ends of the strokes.
Various devices used for holding workpieces on the planer table are:
(i) Planer vise
(ii) Step block
(iii) Planer screw jack
(iv) V -block
(v) End stops
(vi)Angle plate
(vii) Clamps
(viii) Parallel strips
(ix) Holding down dogs
(x) T -bolts, nuts, washers, packing, wedges etc.
Planer Vise
| A - Pin clamp | D - Step block | G - Stops |
| B - Block | E - Offset Clamp | |
| C - Work | F - Screw Jack |
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| Screw Heel Clamp | Plain Clamp |
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| Finger Clamp | Gooseneck Clamp |
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| U Clamp | Double Finger Clamp |
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Universal Adjustable Clamp |
Holding Down Dogs
Clamping of Several Workpieces
| A - Slot plate | B - Packing | C - End Stop |
Work Holding Devices for Planer
Planer vise may be employed for holding small jobs, but it is not much used, since if a job is small enough to be held in this way, it is of a convenient size for the shaping machine and should not be wastefully taking up capacity greater than is necessary.
Sometimes, for planning the edge of a long strip, two vises may be used in line for holding the work. The most common way of holding work is to clamp it directly to the table of the planer. The table has T-slots cut on its surface to accommodate T-bolts. Many styles of damps are available to suit particular situations.
The clamp transmits the clamping force to the workpiece. It must be situated parallel to the clamping surface, thus the bearing surface is made large el1ough. The T-bolts should be located close to the workpiece so that a large clamping force is effected by the lever.
Clamp shown at 'D' is offset or cranked clamp. This is advantageous at the end of a workpiece.
Planer screw jack is used to support the overhanging position of the workpiece so that it does not bend or distort.
Step blocks help in supporting workpieces of different heights.
Angle plates can support L-shaped workpieces.
Stops stop the workpiece from changing its position under the thrust of cut.
Vee blocks can be used for holding circular jobs.
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