Shop Math Worksheet - Tap Drill, Counterbore, Hardness & Material Prompts

How It Works

1. Fill In Tap Drill Section

   Select thread type, size, and engagement percent, then verify thread class, material, tap style, and gaging requirements before production use.

2. Fill In Counterbore Section

   Select screw type, size, and fit class, then verify the current ASME/ISO table, actual fastener, tolerance stack, and drawing callout.

3. Use Hardness Conversion

   Enter a local hardness value for screening only. Acceptance work should use the specified test scale or current authorized conversion table.

4. Review Material Row

   Browse common grade prompts, then verify mill certs, heat treatment, weldability, and tooling manufacturer data.

5. Print Combined Worksheet

   Export the summary with source warnings visible for job-packet review.

Built For

• Machinists preparing source-aware setup prompts for each new job
• Shop foremen documenting which standards and drawings still need review
• Apprentices learning machine shop reference boundaries
• Quality inspectors flagging hardness and material conversion assumptions for review
• Tool crib operators collecting prompt rows before checking current tooling data
• Maintenance mechanics creating repair reference sheets without replacing inspection review

Features & Capabilities

Four Source-Aware Sections

Tap Drill, Counterbore/Clearance, Hardness Conversion, and Material ID prompts with warnings and source pointers.

Normalized Shared State

URL and autosave data are bounded before render so malformed links cannot hydrate unsupported rows.

Hardness Source Warnings

Local hardness rows are labeled as source-gap fixtures, not ASTM or ISO table reproduction.

20 Material Prompts

1018, 1045, 4140, 4340, 303, 304, 316, 17-4PH, A2, D2, and more with local machinability prompts.

Combined Summary

Summary section collects current worksheet prompts for review and printing.

PDF Export

Export the worksheet with standards-review warnings and source pointers.

Assumptions

• Tap-drill prompts use the local percent-thread shortcut shared with the audited drill/tap calculator and need current thread-table review.
• Counterbore and clearance rows are local prompts tied to ASME/ISO source pointers, not licensed table reproduction.
• Hardness conversion rows are local source-gap fixtures and must be checked against current authorized ASTM/ISO data before acceptance use.
• Material rows are local grade prompts and do not replace mill certificates, purchase specifications, heat-treatment records, or tooling data.
• Each worksheet section operates independently; the summary preserves the selected source warnings for review.
• URL and autosave state are bounded before render so malformed shared links cannot select unsupported rows.

Limitations

• Does not validate thread class, tap style, drilled-hole growth, coating, pull-out strength, or go/no-go gaging.
• Does not validate current ASME/ISO fastener rows, drawing tolerance, washer use, edge distance, material thickness, or inspection acceptance.
• Does not provide material certification, weld procedure approval, heat-treatment acceptance, or cutting-data recommendations.
• Does not extrapolate unsupported hardness conversions for acceptance use.
• Combined summary is designed for shop-floor review prompts, not formal quality documentation.
• Does not include surface finish, tolerance-stack, GD&T, fixture, or dimensional-measurement calculations.

References

• Machinery's Handbook 32 source pointer - machining formulas and tables require licensed/current access
• ASME B1.1 and ASME B1.13M source pointers - thread data and tolerances require current standards review
• ISO 2306 and ASME B94.11M source pointers - tap-drill and twist-drill context
• ASME B18.3, ASME B18.2.1, ASME B18.2.8, ISO 273, and ISO 4762 source pointers - fastener and clearance-hole context
• ASTM E140 and ISO 18265 source pointers - hardness conversion context
• ASM Handbook Volume 16, ISO 3685, Aluminum Design Manual, and NIST SP 811 source pointers

Frequently Asked Questions