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The reamer will be dull soon. It shurely happens after ~ 3 reverse turns due to friction of metal chips (back angle of reamer's blade does not cut).
It is very difficult to physically destroy an reamer by such way but there are 3 problems:
1. Dull reamer will "scrap" instead of "cut". Surface will be more rough and hole will be more inaccurate (bad roundness).
2. You HAVE to re-gring dull reamer to sharp its blades.
3. Re-grinded reamer will have smaller diameter - reamer will be inaccurate and inappropriate soon.
Example:
Typical diameter of new (metric) 10H8(+0,022) reamer is 10(+0,01;+0,015).
Diameter of re-grinded reamer will be 10(+0,005;+0,01). After next re-grinding reamer will be 10+0,005 , next time 9,995+0,005, next time 9,99+0,005, 9,985+0,005 and so on.
Reamer marked 10H8 with outer diameter 9,99+0,005 is inappropriate(9,995 is _smaller_ than 10. IT IS VERY BAD due to possible fit error).
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∙ 14y ago
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When did Robert Reamer die?
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