|
Wedge angle ?
|
Edge angle ?
|
Relief angle ?
|
Offset ?
|
Vertical to cutting direction 
|
Cutting direction
|
Cutting direction
|
Cutting direction
Offset
|
| The tip's angle
vertical to cutting direction. |
The
tip's
angle between front- and back edge of the blade. |
The angle
between material surface and cutting edge. |
Distance
between the axis of the blade and the position of the tip (dragged
blades only). |
| Range
(ca.): 12° ... 40° |
Range
(ca.): 30° ... 150° |
Range
(ca.): 15° ... 70° |
Range
(ca.): 0.15 ... 1.00 mm |
| |
In
most cases: a + b = 90°.
In case blades are sharpened on both edges (tangential plotters only) the edge
angle counts from edge to edge. |
|
How
to select your blades ? Here are some useful hints:
1. The more a blade is
"slim" (small wedge- and edge angles) the smaller the objects to be
cut can be in general. But be aware that slim blades have shorter lifetime
than "stocky" ones.
2. Blades with double edge (sharpened on both sides) have a little longer
lifetime than those with single edge.
3. Small characters that have been cut with double
edge blade are easier to weed than those cut with a single edge blade as at the
corners the cuts overlap in a "cross" shape (tangential plotters
only). This however may be not desirable if the objects are very fine or if you
are working with reproduction films (e.g. ulano).
4. The behaviour of drag blade plotters is
dependant on a large number of parameters such as offset, the angles at the
tip, kind of vinyl etc. Also the blade holder - as it is without any
controlled motion - has a big influence. The result may be that the
performance and accuracy of a blade may vary from plotter to plotter and
cannot be reproduced exactly. A blade that works perfect in case A may fail in
case B. The only solution is often to try several tools to find out the best.
Often results are significant better after the change of the blade holder.
Make a trial with our high precision blade holder. |
