Bearing in the grinding process, the surface of their work is carried out by high-speed rotation of the grinding wheel, grinding so if you do not operate according to operating instructions and adjust the equipment, it will appear in the bearing surface flaws, which affect bearing the overall quality of bearings in precision grinding, due to rough demanding, the work surface of the grinding marks to the naked eye can often surface grinding marks are the following.
Performance of cross spiral traces
When this was mainly due to traces of grinding wheel of the bus straight poor, there is bump phenomenon in grinding, the grinding wheel and work piece is only part of the contact, when the work piece or the grinding wheel several times from the movement, the performance will be reproduced in the work piece cross-helix and the naked eye can be observed and these spiral pitch and the work piece table speed 、 the size of the work piece speed, but also with wheel axis is not parallel to the rail line and the table.
(A) the main reason for the formation of spiral
1 Dressing bad, not chamfered corners, are not used for repair coolant;
2 table guide rails too much oil, resulting in floating table;
3 machine precision is not good;
4 grinding pressure and too big.
（B) the reasons for the formation of a helix
1.V-rail rigidity is not good, when the grinding wheel produces the offset, but the edge of grinding wheel surface contact with the work;
2 dressing table for the noisy wheel speed instability, accuracy is not high, so that one edge of the trim wheel slightly less;
3 piece itself poor rigidity;
4 broken on the wheel falling off too much sand and iron filings under the work piece grinding wheel attached to the surface of the plot, this should be a good dressing wheel wash or scrub with a clean, cool water;
5 Dressing well, there are local raised and so on.
 



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