Leafl et
H-1000-4054-02-B
Trigger force gauge guide
Specifi cation
Overall length
95
mm
Needle length
41
mm
Depth
27
mm
Width
43
mm
Range
4 g to 35 g range with 1 g graduations
Renishaw part no.
P-GA01-0001
All Renishaw’s touch-trigger probes have an optimum trigger force
setting for general purpose applications as detailed in table below:
Trigger force
CMM
probes
Stylus length
(typical)
Optimum trigger force
(preset by Renishaw)
Trigger force
range
TP1 (S)
31 mm
(PS1-1R)
0.15 N (15 gf)
0.1 N to 0.5 N
(10 gf to 50 gf)
TP2-5 way
10 mm
(PS1-2R)
0.07 N to 0.08 N
(7 gf to 8 gf)
0.07 N to 0.15 N
(7 gf to 15 gf)
TP6 / TP6A
21 mm
(PS1-12R)
0.11 N to 0.13 N
(11 gf to
1
3 gf)
0.11 N to 0.3 N
(11 gf to 30 gf)
Trigger force
Trigger force is the amount of pressure applied by the helical
compression spring onto the pivotal plate and bearing points to hold
the stylus mount in place.
The trigger force is preset by Renishaw but can be altered for any of
the following reasons:
•
To permit the use of a longer styli on the probe.
•
To permit the use of heavier styli on the probe.
•
If the preset trigger force has decreased due to probe use.
•
If the acceleration of the CMM is causing illegal triggers.
NOTE:
Changing the probe’s trigger force will affect it’s measurement
performance. It is important to requalify the probe confi guration and
check the measurement performance of the probe system after any
adjustment has been made to the trigger force.
Checking trigger force with a Renishaw gram
gauge
1. Ensure that the probe is held fi rmly in position (preferably on a
CMM) and connected to an interface to detect a probe trigger.
2. Establish the direction of trigger which gives the maximum
resistance. The most practical way of doing this is to gently
defl ect the stylus with a fi nger, trying different directions (see
sketch below). There are three lobes which produce three
maximum and three minimum force directions. These can be
easily found with a minimum of practice.
