A ceramic melting dish with handle is supplied with the unit. This crucible is an expendable item and must be replaced from time to time. To improve its useable life and pourability, it is suggested that the crucible be glazed by making up a thin poste of borax and then melting it with a torch. This will form a hard glazed lining inside the crucible. It is further recommended that separate crucibles be used for silver, yellow gold, white gold or other metals being cast.
|Altitude (feet)||Pressure of Mercury||PSI|
The vacuum gauge indicates vacuum in inches of mercury being pulled by the pump. This type of gauge depends on atmospheric pressure of 29.9 inches of mercury or 14.7 pounds per square inch, which is sea level pressure. If the surrounding altitude is increased, the ultimate vacuum reading will be proportion only that much lower. The following chart provides the common equivalents to various altitudes:
To read the correct vacuum in inches of mercury on your gauge, subtract the normal pressure for your altitude from 30.0, then add the figure to your gauge reading. The result will be the corrected gauge vacuum. An easy, quick check of your vacuum system can be made by placing a glass half filled with water (temperature between 70°F and 80°F) under the bell jar and applying vacuum. The water should “boil" (bubble violently) within 40 to 60 seconds.
For pump to operate properly, oil should be even with the OIL LEVEL line when the pump is running.
With reasonable care, your vacuum pump will provide years of good service. Usually, Failure to perform satisfactorily can be corrected easily by a few simple checks:
If you have checked these points and your pump still does not operate properly, follow the following instructions:
If it is necessary to return an inoperative unit:
On your return order, simply stating the unit is "defective" is not enough; you must be as specific as possible:
The vacuum pump is warranted against defects in materials and workmanship for 1 year. These products are guaranteed when used in accordance with these directions and recommendations. The vacuum pump is warranted for the repair, replacement, or credit at invoice (our option) of products which in our opinion ore defective due to defects in workmanship and/or materials. It is not warranted for labor, expense or consequential damage. Repairs performed on items out of warranty will be invoiced on a nominal basis.
Following manufacturer’s recommendations, measure the correct amount of water and pour into mixing bowl:
(Skip this step if using the Vacuum Assist Casting Procedure)
Casting in a vacuum chamber requires the use of specially designed perforated flasks. Select the appropriate flask adopter to match the perforated flask. (There is on adapter ring for 33/s" diameter flask and on adopter ring for 4" diameter flasks. The 5" diameter flask does not require on adopter ring).
Prepare the chamber for the flask as follows:
(Skip this step if using the Vacuum Chamber Casting Procedure)
Casting by vacuum-assist is accomplished with the use of standard solid-wall flasks and the vacuum-assist flask adapter. It is done on a level surface above the casting chamber.