Examples of angles
Example : appropriate angles to cut resinous wood on a D.160 machine
∝ = 35° + β(43°) + ℘(12°) = 90°
① The tooth shape should facilitate the removal of chips. It is therefore important for the tooth gullet to be well curved.
② The chip width should be between 0.5mm and 1.5mm. A too small chip reduces the cutting life of the blade. A too big chip rips the wood too harshly.
Thickness is determined by the following ratio :
Thickness in mm = | feeding speed in m/min x pitch in mm 60 x cutting speed in m/s |
N.B. : Cutting speed (S) is the linear speed of the blade expressed in meter per second.
S = | π x diametre of wheels (in m) x N (number of wheel rounds per minute) 60 |
N = | of the engine in rounds per minute x diametre of engine wheel Diameter of the wheel |
Example :
D.140 machine :
- Engine speed : 1450 rounds/min
- Engine wheel : 220mm
- Machine wheel : 650
N = | 1450 x 220 650 |
= 490 Rd/min | V = | 3.14 x 1.40 x 490 60 |
= 35.9 m/s |