7
SELECTING THE PROPER FLUID SET
The Lemmer series 700 spray gun comes with the 1.4 mm nozzle set which is desired for most industrial finish applica-
tions. However, other combinations may be required for very fine finish work, or when spraying heavier materials.
Fluid set selection
Nozzle sets range in size to provide different fluid flow rates. For low flow rates or light viscosity fluid, select the smaller
nozzle sizes. For high flow rates or high viscosity fluid, select the larger nozzle sizes. For the best atomization, use the
fluid nozzle that will give the required flow with the needle fully triggered.
Measuring paint viscosity
1.
Thin paint according to paint can instructions. Be certain to use a thinner which is compatible with paint used. If
no thinning instructions are given, a general rule of thumb is 5 to 15% thinners. (fine finish up to 35%)
2.
Stir paint completely and strain.
3.
Use the viscosity cup to measure paint as follows:
a) Submerge the Lemmer Viscosity cup in the paint.
b) Lift the cup out of the paint and begin timing.
c) Stop timing when the steady paint stream is first broken.
d) The time recorded is the paint’s viscosity.
4.
Now read the nozzle chart and choose the nozzle which lists the viscosity range (under "type of material") your
material falls into.
Note: This nozzle chart has been made as accurately as possible. Not all paints will exactly comply due to paint
ingredient variations. However, it is an excellent starting point for learning the basics spray painting.
NOZZLE SIZING - HVLP 700 (VENTURI & TURBINE)
There are 4 basic sizes of fluid nozzles available:
Material being sprayed .......................................................... nozzle size ......................... air cap .... viscosity
Fine finish work with stains, lacquers, urethanes, enamels, .... 1.0 mm diameter (.051") .... "S 1" ....... 16 - 22 sec. (thin)
automotive base/clear coats.
Normal output with lacquer & enamels, urethanes, varnish, .... 1.4 mm diameter (.059") .... "S 1" ....... 19 - 32 sec. (medium)
zinc chromate, automotive primers.(also thinned latex & oil base).
Heavy output with lacquer & enamels, butyrate & nitrate dope 2.0 mm diameter (.079") .... "S 20" ..... 26 - 38 sec. (medium)
and epoxies. Latex and oil wall paints.
Wax base stripper, sound deadeners, multi-colors, ................. 2.8 mm diameter (.110") .... "20" ......... 38 + sec. (heavy)
latex paint.
NOZZLE SIZING - A-728 HVLP NON-BLEEDER
There are 5 sizes of fluid nozzles available:
Material being sprayed .......................................................... nozzle size ......................... air cap .... viscosity
Fine finish work with stains, lacquers, ...................................... 1.0 mm diameter (.039") .... "1.0" ........ 16 - 22 sec. (thin)
enamels, automotive base/clear coats.
Medium speed with with lacquer & enamels, ........................... 1.3 mm diameter (.051") .... "1.3" ........ 18 - 30 sec. (medium)
urethanes, clear coats
Normal output with lacquer & enamels .................................... 1.5 mm diameter (.059") .... "1.5" ........ 20 - 35 sec. (medium)
urethane, varnish, automotive primers. .................................... (standard with A728)
Higher output with primers and industrial finishes ................... 1.8 mm diameter (.071") .... “1.8" ........ 25 -38 sec. (heavy)
Thin to medium body waterbase products
Latex and oil paint, multi-colors ............................................... 2.0 mm diameter (.079") .... "2.0" ........ 38 + sec. (heavy)
For ordering details see parts list in back of manual. Note: nozzle and needle must be same size, eg: a 1.4 mm
needle will not work with a 2.0 nozzle. Aircaps and nozzle/needle sets must also be matched for correct operation.
VARIABLE SPEED CONTROL ON T-75Q AND T-90Q
VARIABLE SPEED CONTROL
The T-75Q and T-90Q are equipped with a variable
speed motor control which gives the user a wide range of
adjustment over atomization, heat and noise. An
additional, patent pending feature of the T-90Q will
automatically slow the motor when spraying stops to
reduce heat and increase motor life.
INITIAL SPEED SETTING
An excellent starting point is speed 2 on the T-75Q, or
speed 3 on the T-90Q. These speeds are typically used
with medium viscosity materials which are sprayed with
nozzles of 1.3 to 1.8 mm.
NOTE: When first selecting a motor speed, always
ensure the airflow control valve on the hose is fully open
to prevent interference between these two controls.
ADJUSTING THE SPEED
Thicker paints and/or nozzles larger than standard size
(1.4 & 1.5mm) often need more power for correct
atomization. For these situations, use a higher speed
setting.
For thinner paints, smaller nozzles and/or finer work,
excess air pressure may cause unwanted overspray. For
these situations use a lower speed. A lower speed setting
will also reduce air temperature from the turbine, which is
important if the material tends to dry very quickly.
Содержание HVLP T Series
Страница 23: ...23 NOTES...
