IMET GBS 218, Instructions For Use Manual, Page: 11 / 35

TRADUCTION OF THE ORIGINAL INSTRUCTIONS FOR USE
GBS 218 / AutoCut ED.2010eng rev.00
11/35
10 - BAND CHOICE
In this paragraph we recommend the type of cutting band in accordance with the material to use . To get the best
performance from this machine it is necessary to undestand the right use of the used tools and what you have not to do
with them.
The band you have to use must have the following sizes ( in mm. ) :
maximum lenght = 2460 minimum lenght = 2440 total height = 27 thickness =0,9
It is also important the material of the band , it is usually used the bi-metal band type in the different HARDNESS quality,
named M42 or SVGLB The endurance of the teeth increases , and also the fragility, when pass from the material M2 to
M51.
To making a right cut it is also necessary to choose the pitch ( t ) or the number of the teeth per inch (z). Usually
the band must have the toothing as follows :
- close toothing - to cut thin materials, tubular and profiles.
- thin toothing- to cut solid materials or pieces that need a long band ( for example . the central part of a profile " U " ), or
softer materials as aluminium, copper, soft bronze.
By choosing the right one you can avoid a lot of working errors and you can get a good band penetration and the
necessary space for the chips.
If you cut some pieces at the same time, you must consider them as only one piece by considering the global
size.
The included table supply you the informations for a right choice, the same one can also be updated or changed
by the user according to his personal experiences.
Even if there are toothings with constant pitch , the most of the band sawing machines allow the use of band with
variable pitch toothing - groups of teeth with different pitch between them- that reduce vibrations and noice, by getting
better the finishing and the capacity of removal.
SUGGESTED TOOTH PITCH SOLIDS
Outer
Diameter
(mm)
BIG
PROFILES
Wall
Thickness (mm)
PROFILES
Wall Thickness
(mm)
BUNDLE
Lenght
to Cut
(mm)
REF.
VARIABLE CONSTANT
14 M42 - - 1,5 max -
10/14 M42 10 M42 - - 1 to 2 -
8/12 M42 8 M42 20 max - 2 to 4 -
6/10 M42 6 M42 40 max - 4 to 8 -
5/8 or 5/7 M42 5 M42 30 to 80 6 to 12 - 50 to 100
4/6 M42 4 M42 50 to 100 10 to 20 - 70 to 120
3 /4 M42 or M51 3 M42 or M51 80 to MAX. 15 to MAX. - 100 to 200
MATERIAL
GROUP
i.e. DIN
denomination
DIN N° Maximum
BLADE SPEED
m/min
Minimum
BLADESPEED
m/min
MOTOR
SPEED
(1or2)
FEED
FORCE
COOL
ratio
1)STRUCTURAL
STEEL
St37 St42 10037-10042 60 40 1. LOW 10%.
St50 St60 10050-10060 50 35 1 LOW 10%
HARDENING STEEL C10 C15 10301 10401 45 35 1 LOW 15%
16MnCr5 20CrMo5 17131
17264
40 30 1 Low/Med 10%
AUTOMATIC STEEL 9S20 10SPb28 10711 70 50 1 2 LOW 15%
BEARING STEEL 100Cr6 13505 50 25 1 Med/Hig 5%
SPRING
STEEL
65Si7 15028 40 30 1 Med/Hig 5%
4)CAST IRON GG15 GG30 -- 50 30 1 Med/Low dry
5)NOT-FERROUS
ALUMINIUM
AL99.5 GalSi15Mg -- 300 50 2 Med/Low 2%
BRONZE
COPPER
CuSn6 CuSn6Zn
G-Cu Ke Cu
-- 120
200
40
50
2 1
2
Med/Hig
LOW
2%