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Ford Standard Ford Cups
|Ford Standard Cups|
|Ford Standard Cup Number||Conversion Chart|
Centistoke Viscosity Range
|0||57 to 120||2 to 14||G-6|
|1||60 to 120||12 to 40||G-10|
|2||37 to 120||25 to 120||G-35|
|3||23 to 120||29 to 273||G-60|
|4||16 to 120||34 to 441||G-60|
|5||10 to 120||77 to 1413||G-200|
Ford Standard Cup
The internal dimensions conform to those specified in the ASTM Method D1200 except for the diameter of the orifice. Even here there is close agreement, but the diameter of the orifice is adjusted to bring the cup into conformity with the flow formula. Most of the Ford cups produced by others to date have an external cup diameter that extends below the level of the orifice. This results in a large amount of metal adjacent to the orifice which can adversely affect the accuracy of the reading if the cup and material being measured are not at the same temperature at the time the measurement is started. Most of this mass of metal has been removed in the new design. The bottom of the cup is designed to extend below the orifice. This design not only provides adequate stability for the cup when resting upright on a surface, but it also protects the orifice from damage. This protection is also closer to the orifice than in other designs.
The drip ring surrounding the top of the cup has been increased in volume to accommodate a greater amount of material. This change minimizes the frequency of cleaning or reduce spillage in long series of tests. Pictured on the right is a cross section of the orifice used in both the Gardco Standard and the Gardco Ford Dip Cups. Note that the upper interior portion, following the conversion from the slope of the cup interior is spherical in shape rather than conical. It has been found that this shape provides a cleaner break of the stream as the cup empties. In addition, the length of the orifice is better defined in accordance with theory. The "0" orifice does not have this feature as it is longer and has less need of this shape. In the new design the exterior of the brass orifice is a truncated cone, sized to match a conical section in the body of the cup. This design insures close fit with no gaps between the body and the orifice either at the top or bottom. This design also eliminates the hard to clean areas that exist in most other designs.
Orifice Removal: To remove the orifice, simply place the cup upside down on a solid surface, place a wood dowel rod (VI-WD) against the orifice and tap the dowel rod with an object such as a paperweight. To insert the orifice, place the cup on a solid surface right side up, drop the orifice in place, place the dowel rod into the spherical section of the orifice and tap the dowel rod with a heavy object.
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It is helpful, and results will be more consistent, if all viscosity determinations are made in a room that is free from drafts or quick temperature change, and is within ±3°C (±5°F) of the viscosity measuring temperature of 25°C.
Ford Standard Cup