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The rasp bar cylinder, with open bar concave, receives crop material from the feeder house for threshing, and separates up to 90 percent of the grain from the straw.
When the concave and rasp bars are worn, productivity can be affected in several ways:
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Incomplete threshing
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Grain damage resulting from excessive cylinder speed
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Reduced combine capacity
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Poor feeding
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Excessive power requirements
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Poor grain tank sample
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Cylinder and concave plugging
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Separator grain loss
Smooth Rasp Bars
The surface of the smooth rasp bar has no serrations. The smooth surface helps to deliver a "softer", less aggressive threshing impact than a regular rasp bar. This bar is recommended for use only in food corn.
Hardened and Non-Chromed Rasp Bars
This serrated rasp bar has a gently contoured surface design that wears to an even, smooth profile after only 50 to 100 hours of use.
This rasp bar is recommended for use in harvesting corn, popcorn, soybeans, malting barley, edible beans, or any seed crop where high quality grain is demanded.
Hardened and Chromed Rasp Bars
The chrome, overlay of this rasp bar provides twice the wear life of the non-chromed rasp bar. The chromed rasp bar also features a smooth, contoured profile design, but new, sharp surface edges won’t "wear off" as rapidly as on the non-chromed rasp bar.
As a result, this rasp bar is not recommended for use in high-moisture corn or soybeans, or any crop where the highest quality grain is the main consideration. However, this rasp bar is ideally suited for general use in all crops where long-lasting, efficient threshing performance is the primary concern.
STS Threshing Element
In place of the rasp elements used in cylinder/straw walker combines, the STS combines feature a unique, smooth, threshing element. This patented, uniquely shaped element is manufactured of an extremely tough, very hard material called austempered carbidic iron. The smooth threshing surface of the element helps to maintain optimum grain quality in all crops, while the trailing, blade-like edge moves the crop material rearward through the STS module.
To maintain overall combine performance, the STS threshing elements should be replaced when the height of the rear blade edge is worn to approximately 1/2-inch. Replacement elements are sold in weight-matched sets of three so that proper threshing module balance is maintained.
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