From: "Dwight K. Elvey" 
To: atm{at}shore.net
Reply-To: "Dwight K. Elvey" 


Hi
 I still find optically measuring of ROC to be better.
One can look to see if the curve is uniform out to the edge and measure
with greater accuracy, using just a water spray bottle, tape measure and a
small light source. ( you also need one eye ball on a moveable head )
Dwight


>From: MLThiebaux 
>
>>Off list, a salty machinist pointed out that the tolerances of drill bits
>>can be quite lose.  Aspiring to be salty myself, I too measured a few bits.
>>Finding errors of:
>>
>> +.0013
>> +.0009
>> -.0010
>> -.0011
>>
>
>And how straight are the straight edges?
>
>Martial Thiebaux
>Rawdon Hills, Nova Scotia
>
>
>

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