Hyd-Mech H14A, Manual

Page: 28 / 116

2.12
2.13
Optimum
Pitch
10/14
1.0
8/12 .83
6/10 0.67 .80
5/8 0.54 .65 .81
4/6 0.42 .50 .63 .77
3/4 0.29 .35 .44 .54 .70
2/3 0.21 .25 .31 .38 .50 .71
1.4/2.5 0.17 .20 .25 .31 .40 .57 .80
.85/1.5 0.1 .12 .15 .18 .24 .34 .48 .60 1.0
10/14 8/12 6/10 5/8 4/6 3/4 2/3
1.4/
2.5
.85/
1.5
Optimum versus Actual Blade Pitch
Shading indicates opti-
mum and actual pitch and
required multiplier at point
of intersection, for the given
example.
If your blade is finer than optimum blade pitch multitiply
feed rate, fr, by above factors
For Example #1
, it is known from Step 3 that optimum
blade pitch is 2/3, and from Step 4 that blade speed, is
200 ft/min (60mm/min). From the Graph on the left, the
FEED RATE is determined in the following way:
- On the horizontal axis (blade speed axis), find 200
ft/min(60mm/min).
- Find the point where a vertical line from 200 ft/min
(60mm/min) would intersect the 2/3 blade pitch curve.
- From this intersection point run horizontally left to the
vertical (FEED RATE) axis, to arrive at 1.8 in/min (45mm/
min) FEED RATE. Thus 1.8 in/min (45mm/min) is the
FEED RATE for cutting 8” (200mm) diameter 1045 Car-
bon Steel when the optimum 2/3 pitch blade is used.
Feed Rate Calculation