Tap And Drill Chart Calculator
v4.2.3 · 1.8 MB · code 6
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File information
UpdatedDec 15, 2025
PublishedJun 9, 2023
Packagecom.principiaprogramatica.tapanddrillcalculator
Versionv4.2.3 (6)
Size1.8 MB
MD55f65a19a98ffdb82189bb223918c0cdd
Min SDK19
Malware scanTRUSTED
Signature SHA1DF:33:3E:FA:86:58:6E:D9:F6:BB:1C:07:8E:0E:5D:99:AB:7B:0D:25
SignerCN=Greg Miller, OU=Greg Miller, O=Greg Miller, L=Greg Miller, ST=Greg Miller, C=US
Total downloads100,000
This version100,000
DeveloperGreg A Miller
Age ratingEveryone
Security scan
TRUSTED
- Developer signature verified 2025-12-15
- Signature SHA1 DF:33:3E:FA:86:58:6E:D9:F6:BB:1C:07:8E:0E:5D:99:AB:7B:0D:25
- File MD5 5f65a19a98ffdb82189bb223918c0cdd
How to install Tap And Drill Chart Calculator v4.2.3 on Android 4.4 KitKat+
Takes about 2 minutes. You'll need roughly 1.8 MB of free storage.
- Grab com.principiaprogramatica.tapanddrillcalculator_6.apk — hit the Download button above (1.8 MB). If your browser warns about APK files, choose Keep or Download anyway — that warning fires on every APK, not just this one.
- Trust your browser to install — on Android 8+ go to Settings → Apps → Special access → Install unknown apps, pick the app you downloaded with (Chrome, Firefox, Files, etc.), and flip Allow from this source. On older Android, toggle Unknown sources under Security.
- (Optional) Verify the file — compute the MD5 of the downloaded APK and make sure it matches 5f65a19a98ffdb82…. Any difference means the file is corrupted or tampered — delete and re-download.
- Open the APK — tap the download notification, or find com.principiaprogramatica.tapanddrillcalculator_6.apk in your Files app under Downloads, then tap it. Android's package installer will appear.
- Check the signer — the install screen will name the publisher. For this build it should read CN=Greg Miller, OU=Greg Miller, O=Greg Miller, L=Greg Miller, ST=Greg Miller, C=US. If it doesn't match, cancel — you have the wrong file.
- Review permissions & tap Install — scroll the permission list, then confirm. If Play Protect flags it, tap Install anyway (this APK was scanned as TRUSTED).
- Done — open Tap And Drill Chart Calculator — tap Open on the install screen, or find the Tap And Drill Chart Calculator icon in your app drawer.
Common install errors for Tap And Drill Chart Calculator
- "App not installed" — usually means an older or differently-signed version is already on your device. Uninstall it first, then retry. Your data may be lost unless you back it up.
- "Parse error" — the APK is for a newer Android than yours. This version needs Android 4.4 KitKat or later. Pick an older build from the versions list below.
- "There was a problem parsing the package" — the download was interrupted. Delete the file and re-download over Wi-Fi.