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Technical Information Leaflet TIL: 003 LM2700 Backlapping...
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A pot of back-lapping paste. Back-lapping paste is a water soluble abrasive grinding paste. It is available in different grades but the grade that we would recommend for back-lapping Baroness blades is 80 grit, or Course.
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Firstly adjust the contact between the cutting cylinder and the bottom blade to achieve the best cut possible keeping the contact even across the entire width of the blades. Then increase the contact so that it is slightly heavier than you would use for cutting, but still make sure that the cylinder rotates with just a light pressure.
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With the aid of an assistant and with the parking brake on, start the engine and leave it running at idle. The assistant should remain on the seat and able to stop the machine in an emergency. With the engine running select cutting cylinder reverse (switch back).
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Dip the long handled brush into the back-lapping paste until the brush has a good covering of the abrasive paste. Apply the back-lapping paste to the top of the rotating cutting cylinder using the long handled brush as shown. Do not allow the brush to enter too far into the cutting cylinder as this could pull the brush into it.
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Next, move on to the third unit and repeat the process. With the third cylinder still rotating, go back to the second one and turn it off. Work your way around all 5 cutting units as described above so that you only ever have two units rotating at once, as having the cylinders running dry for a prolonged period of time can cause damage to the blades.
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