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Gerber to Drill

I want to convert a gerber-layer to a drill layer. When using Gerber Layer to Drill everything works fine – however, the size of the drill tool is not correct. The gerber data is a flash – 0.6mm in diameter – the drill tool generated is 0.5482 mm in diameter. What did happen? 

I checked this with a 1.000mm flash as well – it seems to me, that in the drill table generated by the conversion algorithm only handles whole numbers (like 23 mil, or 39 mils). The digits after the comma will probably not be used! 

Is there a solution or workaround for this?
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When two drill holes are different sizes but within tolerance, FAB 3000 with uses the same hole size. Why? Must PCB shops only have a certain number of available drill bit sizes. For example, they probably will not have unique drill bit sizes at: 0.6mm, 0.58mm, 0.56mm, 0.61mm
Thus rounding of drill hole sizes within tolerance may take place when your PCB is manufactured. It's a good idea to check-in with your PCB shop and find out what available drill bit sizes they have available.

To correct this rounding, please perform the following:
1. Go to menu: Tools | Drill | Gerber to Drill...
2. Adjust the tolerance to a smaller more acceptable value (less than 0.002).
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