Another important point is to see that the lubrication of the compressor is carefully watched; the sight feed lubricator on top holds sufficient lubricant for 10 working days and is capable of adjustment by means of a needle valve. It can, therefore, be easily set. The main bearings are ring oiling and only need occasional attention. The fan bearings are ball bearings and only need attention once in six months.
The Eureka Spraying Machine.
Fig. 58.—The Crane "Eureka."
Fig. 59.—The Crane "Record."
An inspection of Figs. 58 and 59 will show that this machine is of entirely different construction to those already described. The advantages claimed are the simplicity in construction, the absence of complicated parts which might get out of order, and the fact that the machines cannot clog in use. The operation is as follows: The feed pipe from air tank should be connected up with a high-pressure hose to the sprayer and a fluid nozzle is then adjusted so that the tip of the nozzle is in alignment with the centre of the air nozzle. This adjustment varies according to the thickness of material. When using thin liquids the fluid nozzle should be slightly below the centre of the air nozzle. When ready for spraying the valve is pressed, and this releases the air, which blows through the air nozzle, across the top of fluid nozzle and draws up the material from the inside, spraying the fluid on to the work. The shape of the spray is that of a fan. The air pressure required varies from 20 to 50 lbs. according to the viscosity of the material being dealt with. As a rule the best results are obtained when the machine is held from 4 to 6 in. away from the work. The Fredk. Crane Chemical Co., Armoury Close, Bordesley Green, Birmingham, are the agents for these machines, and it is also manufactured in the United States. The remarks given under the head of "Exhaust," "Air Compressor," etc., will apply to this machine also. It may be observed that the cup holding the metal can be very quickly changed, so that a variety of colours may be sprayed one after the other with very little trouble. The price of the machine (which may be provided with an agitator if required) is low.
"The Invincible."
These sprayers are designed on an excellent "universal movement" principle and are particularly well constructed throughout. They further claim distinction on the score that every section is an independent unit of standardized pattern, and as spare parts are always available, replacements and renewals can be made instantly with the minimum of trouble and cost.
They are made in several types to suit varying classes of work, ranging from the fine lining and shading of small objects required by artists, etc., to commercial painting on the scale practised by motor car manufacturers and other large users; and important points in their favour are the special facilities provided for quick cleaning after use, their completely enclosed mechanism, which prevents the penetration of any dirt, colour or liquid to working parts, and the adjustment of the needle so that no pressure or damage can occur at any time to the colour tip, even if trigger is allowed to snap forward.