Privacy Policy

1. Overview & Privacy Principles

At Drill Calculator (drillcalculator.com), we respect the privacy of every machinist, CNC programmer, engineer, student, and manufacturing professional who visits our platform. This Privacy Policy outlines what information is collected, how it is used, and how your privacy rights are safeguarded.

2. Proprietary Machining Data We Do NOT Collect

We do not require user account registration, passwords, or credit card information to use any of our 10 calculators, 9 technical guides, or 5 engineering charts. When using our tools:

• We do not record the tooling diameters, SFM inputs, or feed rates you test.
• We do not inspect or store generated G-code blocks (G81, G82, G83, G73).
• We do not correlate shop-floor calculations with company identities or proprietary part drawings.

3. Information We Automatically Collect

When you access drillcalculator.com, our hosting network automatically logs standard server connection metadata necessary for security, rate-limiting, and network optimization:

• Technical Identifiers: IP address, browser user-agent, operating system type, screen resolution, and language preference.
• Request Data: Requested page URL, timestamp of request, HTTP response status code, referring URL, and transfer byte volume.

These logs are aggregated for infrastructure monitoring, DDoS defense, and server health analysis, and are retained for standard operational periods before automatic deletion.

4. Browser Local Storage & Cookies

We employ browser localStorage exclusively to enhance shop-floor usability across sessions:

This data remains solely inside your browser's private local storage partition and is never transmitted over the network to external third parties.

5. Third-Party Services & CDNs

To maintain sub-second global load speeds for machinists everywhere, we utilize trusted global infrastructure providers:

• Content Delivery Networks (CDNs): Cached edge servers serve HTML, CSS, JavaScript, and SVG assets closest to your geographic location.
• Google Fonts: Web typography (Geist and Geist Mono) is loaded from Google's privacy-compliant font delivery CDN.

6. Voluntary Contact Form Inquiries

If you voluntarily submit our contact form or send an email to our engineering desk, we collect your name, email address, inquiry topic, and message content. This information is utilized strictly to investigate technical questions, correct formula bugs, and respond to your correspondence. We never share or sell contact inquiry lists to marketing brokers.

7. Your Privacy Rights (GDPR & CCPA/CPRA)

Depending on your location, including the European Union / European Economic Area and the State of California, you hold specific statutory rights regarding your personal information:

• Right of Access & Portability: You may request confirmation of any personal data we hold about you.
• Right to Erasure: You may request the deletion of correspondence or communications you have submitted.
• Right to Object & Restrict: You may object to the processing of your communication data.
• California "Do Not Sell or Share My Information": We do not sell, rent, or trade your personal information for monetary or other consideration.

To exercise any of these rights, please email our privacy desk at info@drillcalculator.com.

8. Children's Online Privacy Protection

Drill Calculator is an engineering calculation platform intended for machinists, manufacturing engineers, and vocational students. We do not knowingly collect personal information from children under the age of 13.

9. Revisions to this Privacy Policy

We may update this Privacy Policy periodically to reflect new calculation features, legal requirements, or infrastructure updates. Any modifications will be posted directly to this page with an updated "Last Updated" timestamp.