The pneumatic lift version of the Model 24 is based on the open face machine, but has the pressure weights attached to the rods of three pneumatic cylinders. Selfaligning bearings accommodate any slight vertical misalignment and ensure an even pressure is applied to components inside the conditioning ring. The cylinders are mounted vertically on sliding rails within a fabricated hollow, known as a â€œspider bar". This is cantilevered over the lap plate and is mounted onto an upright column bolted to the machine frame. The primary function of the pneumatic arrangement is to permit loading and unloading to be carried out without the need to lift pressure weights manually. However, they can be used to supply additional loading to the components within the conditioning ring should this be required.
Operator safety is a primary concern in the design. Movement of each pressure weight up or down is controlled by a two hand anti-tie down control box. This arrangement requires the use of both hands on two separate buttons to operate, and ensures that the operator cannot injure his hands or arms when lowering the weights.
A further safety feature is that thepressure weights are mechanically latched when in the fully raised position so that, should the compressed air supply or electrical power fail, they will not fall.
The machine is intended for use with free abrasive slurries -abrasive grit suspended in an oil-based or water based vehicle.
Flatness of the lap plate, and consequently of the work, is controlled by adjusting the position of the three conditioning rings relative to the lap plate track.
The pneumatic cylinders and pressure weights are also capable of the corresponding adjustment.
This machine is also available in Open Face version.
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