Fireboy- Xintex TT-100 User Manual
TT-100
TachTape
INSTRUCTIONS
SPECIFICATIONS
Temperature range:
Gear pitch equivalent: approximately 7 dlametral pitch.
Maximumcontinuous len2th:
Caution: Do not expose tape to strong AC or DCmagnetic fields and use only with Dynalco
magnetic pickups.
FUNCTION:
Provides a convenient, simple and low-cost means to activate Dynalco magnetic pickups in
speed and frequency measurements.
USE:
An inexpensive substitute for large split gears, slots in shafts, drilled holes in flywheels,
etc., for magnetic pickup speed sensing.
DESCRIPTION & CHARACTERISTICS~
Dynalco Tach Tape is a strip of flexible magnetic polymer. bn one side it has a pressure-
sensitive adh€sive protected by a peel-away backing. This adhesive will adhere to a wide
variety of surfaces, including most plastics and metals.
-30 F to +160 F. (-35 C to +70 C)
100 feet
(30 meters)
'-.-/
"-.-/
Because of its unique magnetization and arrangement of slots, a series of alternate magnetic
poles are generated along the length of the tQpe. A Dynalco magnetic pickup becomes
activated when placed perpendicular to the tape surface.
Figure 1 demonstrates that the tape performance is better than an a-pitch gear when the
air gap is larger than .050 inch (1.2MM). This is especially welcome in cases where a
small air gap is difficult to maintain or space is too restricted. to install split gears
because the Tach Tape-Dynalco pickup combination is so well suited to large air gaps.
Because of centrifugal forces acting upon the tape when rotating, a safe maximum speed shoulq
be observed (shown in Table 1). If greater speeds are required, a fiberglass reinforced
plastic tape (such as one inch wide strapping tape #ST-40, Superior Insulating Tape Company)
may be wrapped over the magnetic tape (two layers as shown in Figs. 2&3), which quadruples
the maximum safe speed. (Pickup senses through reinforcing tape)
The tape should not be @xposed to strong AC or DC magnetic fields and should only be used
with Dynalco magnetic pickups to prevent possible de-magneti~ation.
TABLE 1, MAXIMUM SAFE SPEED
SHAFT DIAHETER
3 IN
6 IN
9 IN
12 IN
24 IN
36 IN
(7.5 cm)
(15 cm)
(23 cm)
(30 cm)
(60 cm)
(90 cm)
WITHOUT REINFORCED TAPE
2500 RPM
1800 RPM
1500 RPM
1200 RPM
900 RPM
700 RPM
WITH REINFORCED TAPE
10,000 RPM
7,200 RPM
6,000 RPM
4,800 RPM
3,600 RPM
2,800 RPM
~
This table assumes the Tach Tape has been applied according to the instructions which
folJow.
'-""
200V
PfAK
ro
PfOK
500 INCHE~!5ECOND
~ ~
(1270 CM/SECOND)
100K LOAD
I50V
100V
GEAR PITCH IS THE NUMBEROF TEETH PER
INCH OF DIAMETER, AND IS A MEASURE OF
"
"
'"
..
2
"
"
5OV
~
,
'"
~
0
~
TOOTH SIZE.
m
..,
0.120 INCHES
"-"
10
0
0.020 IN 0040 IN
0.060 IN
0060 IN
AIR GAP
~.5
'"r
0 100 IN
Fi gl.}re 1
amv TO APPLY AND USE TACH TAPE
The following procedure should be used:
1. Clean the surface area of the shaft, approximately 2 inches wide, to remove dust,
dirt, oil, rust, etc. Use a cleaner such as MEK, TRICHLOR, paint thinner, etc.
2.
Before removing peel-away backing from the tape, wrap the tape around the shaft to
determine the length required.
The tape must be cut
Frequency = RPM X No. of slots
'-"
3.
Cut both ends of the tape squarely as shown in Figure 2.
through the slots.
4.
Peel away the backing and wrap the adhesive side aro~nd the shaft as straight as
possible.
5.
After wrapping, press the tape to the shaft to ensure good adhesive.
6."
If faster speeds are required, a reinfbrcing fiberglass tape may be wrapped around the
Tach Tape (see Table 1).
Starting at approximately the opposite end of the Tach Tape "joint", apply two full
turns of reinforcing tape as shown in Figure 3.
7.
Use only Dynalco magnetic pickups. Other pickups may have reversed magnetic flux
direction that can demagnetize the tape.
8.
Calculate frequency (Hz) or pulses per second as follows:
60
Note:
The number of slots should include the one created at the joint.
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