back rake

基本解释

The cleaning rake moves forth and back in line direction. It is specially suitable for coarse suspensions.
除渣耙做直线往复运动，对于粗大悬浮物去除尤为适用。
PDC cutter size, back rake and density are very important design parameters affecting the performance of PDC bit.
PDC切削齿尺寸、后倾角和布齿密度是影响PDC钻头性能的重要设计参数。
A study is made on the working angle in scraping process, practical Calculations are taken up to the angle of working edge, rake angle and back angle. Some patterns of such change are found out.
本文对刮削过程中工作角度问题进行了探讨，并对工作刃倾角、工作前角和工作后角进行了具体计算，得到了一些变化规律。

However, they do give a generous share of their rake back to high volume players and to others indirectly via freerolls and other promotions.
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That would really tip the playing field against high-benefit cards that rake off as much as 3% of sales revenue and hand much of it back to consumers in rebates, air miles or other lagniappe.
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