Rub Collars
Rub collars are used when shaping curved or irregular workpieces, such as arched doors or round table tops. Rub collars also limit the depth of your cut.
There are two types of rub
Rub collars may be used in any of the following positions:
1.Rub collar below the cutter: When the rub collar is used below the cutter as shown in Figure 38, the progress of the cut can be observed. However, any unintentional move- ment may lift the workpiece into the cutter, damaging your work and creating a danger- ous situation that may result in kickback. We do not recommend using the rub collar below the cutter.
Figure 38. Rub collar installed below cutter.
Whenever the cutterhead is above the workpiece, or you can see it spinning dur- ing use, you must take extreme caution to keep your hands away from the cutterhead. Failure to do so may cause serious per- sonal injury.
G8621
2.Above the cutter: When the rub collar is used above the cutter as seen in Figure 39, the cut cannot be seen. This offers some advantage: the stock is not affected by slight variations in thickness and accidental lifting will not damage the workpiece. If lifting occurs, simply correct the mistake by repeat- ing the operation.
Figure 39. Rub collar installed above cutter.
3.Between two cutters: Using a rub collar between two cutters, as in Figure 40, has the distinct advantage of performing two cuts at once or eliminating the need to change cutters for two different operations. Notice that part of the edge is left uncut. The uncut portion rides on the rub collar.