POSITION OF COLLARS
When shaping with collars, the collar must have suffi- cient bearing surface, as shown in Figure 35. Also the work must be fairly heavy relative to the cut being made. Under no circumstances should a short, light workpiece be shaped against the collars, as shown in Figure 36.
The collars may be used in any of the following posi- tions: above, below, or between the cutters.
1.When the collar is used below the cutter, as shown in Figure 37, the progress of the cut can be seen throughout the operation. However, any accidental lift- ing of the work will gouge the wood and ruin the workpiece.
2.When the collar is used above the cutter, as shown in Figure 38, the cut can not be seen, but this method offers an advantage in that the cut is not affected by slight variations in the thickness of the stock. Also, accidental lifting of the workpiece will not gouge the workpiece; simply repeat the operation to correct the mistake.
3.Using the collar between two cutters has the advantages and disadvantages of the first two proce- dures, and is frequently used where both edges of the work are to be molded. See Figure 39.
NOTE: It is advisable to place the cutter as low as possible on the spindle to reduce spindle deflection and ensure the best possible finish. Also make sure that the contacting surfaces of the cutter are smooth, sharp, clean and without dents.
FIGURE 38
FIGURE 35
FIGURE 36
FIGURE 37
FIGURE 39
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