Horizontal Boring & Doweling In Woodworking (continued)
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version of Tip - Pg. 1-3,Pg 4-6,Pg. 7-9
Bits and Speeds
Because boring is so similar to drilling, you can use the same bits and the same speeds. To adjust the Mark V to the correct speed, refer to Table 11-1.
Table 11-1: Horizontal Boring Speed Chart
Size of Hole
Hardwood
Softwood
1/4" and less
H (1600 RPM)
I (1750 RPM)
1/4" to 1/2"
F (1300 RPM)
G (1450 RPM)
1/2" to 3/4"
D (1050 RPM)
E (1150 RPM)
3/4" to 1"
B (850 RPM)
C (950 RPM)
Over 1"
SLOW (700 RPM)
A (750 RPM)
Boring metals (twist bits only)-Slow (700 RPM)
Note: These speeds are for 60 hz. operations. For 50 hz. operations, refer to Table 1-1.