I really liked the drill charts and I did some more work on them for scaling on larger screens like the Kindle and other tablets. I haven't updated RC Calculators on Google Play yet.

But I have created a new standalone FREE app called Drill Bit Charts with the new scaling and you can get it now from Google Play directly from your Android device by searching for drill bit charts. The Google Play page is at [link=https://play.google.com/store/apps/details?id=com.donstegall.drill*****art]Drill Bit Charts[/link].

I will be submitting it to the Amazon Appstore but that will take 4-5 days for approval. So Kindle users will have to wait just a little while. It does work well on the Kindle though.