Here are a few others i have found useful.
Job Shop Machinist Lite by Matthew Moore
**LINK**
Fraction Converter Calculator by Intemodino Group s.r.o.
**LINK**
Fraction Calculator + Decimals by Visual Math Interactive Sdn. Bhd.
**LINK**
iEngineer by Perfectly Simple Apps LLC
**LINK**
FSWizard by Eldar Gerfanov
**LINK**
Convert Any Unit by Cider Software LLC
**LINK**
Kyocera Cutting Tools by The Pinnacles Interactive Pte Ltd
**LINK**
Sandvik Coromant Publications by Sandvik Coromant
**LINK**
I have no personal links to any of these apps i started using them when my shop calc calculator died and i didnt want to fork out $100au + for a new one especially when i had an old ipad that still work fine and i can choose what apps i put on it . Some of these apps have a pro version where you pay a small one off fee to purchase it , they sometimes unlock a few more features and get rid of the ads.
Ian