It's necessary to consider different elements to design circular saw blades: type and thickness of the material to be cut, sawing machine's features, working system, speed and so on.
The basic guide to select the most suitable tool is given by the relationship between: feed speed (U), number of machine's revolutions (n), number of teeth (Z) and each tooth's feed (Sz) or the chip thickness.
Formulas and tables shown below can orient you to choose the right tool.
Feed
U = Z number of teeth · n number of revolutions · Sz each tooth's feed
Number of teeth
U feed
Z = --------------------------------------------
n n° of revolutions · Sz each tooth's feed
Each tooth's feed
U feed
Sz = ------------------------------------------
n n° of revolutions · Z number of teeth
Number of revolutions
U feed
n = ---------------------------------------------
Sz each tooth's feed · Z number of teeth
Table to calculate each tooth's feed (Sz)
| |
Peripheral speed (Vp) |
(Sz) |
| Wood |
30 ÷ 60 |
0,3 - 0,5 |
| Plywood |
30 ÷ 60 |
0,2 - 0,4 |
| Compressed |
25 ÷ 50 |
0,1 - 0,2 |
| Thermoplastc |
25 ÷ 50 |
0,15 - 0,2 |
| Hard-plastic |
20 ÷ 60 |
0,08 - 0,15 |
| Masonite |
10 ÷ 40 |
0,15 - 0,25 |
| Aluminium |
30 ÷ 90 |
0,04 - 0,20 |
Maximum number of revolutions allowed for circular saw blades
Maximum cutting speed:
100 m/sec
Econimical cutting speed:
80 m/sec -
60 m/sec
Minimum cutting speed:
40 m/sec
Maximum number of revolutions
| Diam. |
Max speed |
Eco speed |
Min speed |
| 100 |
19000 |
15000 - 11000 |
7600 |
| 150 |
13000 |
10500 - 7500 |
5500 |
| 200 |
9500 |
7500 - 5500 |
3800 |
| 250 |
8000 |
6500 - 4500 |
3100 |
| 300 |
6500 |
5000 - 3800 |
2500 |
| 350 |
5500 |
4500 - 3300 |
2200 |
| 400 |
4500 |
3800 - 2500 |
1900 |
| 450 |
4200 |
3400 - 2300 |
1700 |
| 500 |
3800 |
3000 - 2100 |
1500 |
| 600 |
3200 |
2200 - 1900 |
1300 |
| 700 |
2500 |
2000 - 1300 |
1200 |
| 800 |
2200 |
1800 - 1300 |
900 |
| 900 |
2000 |
1600 - 1200 |
800 |
| 1000 |
1900 |
1500 - 1100 |
700 |
| 1250 |
1500 |
1200 - 900 |
600 |
(The values above indicated may change according to the composition of the material to be processed)
