Auto Block Tap Holes for Easy Counting in AutoCAD

Free AutoCAD AutoLISP – Automatically Convert Tap Holes to Blocks for Easy Counting

When working with mechanical drawings in AutoCAD, one common problem is:

• Tap holes are drawn using circles, arcs, and lines

• Different designers use different drawing styles

• When you need to count tap quantities (M3, M4, M5, etc.), it becomes:

  • Time-consuming

  • Error-prone

  • Hard to standardize

👉 The most effective solution is to convert all tap holes into standard blocks.

This FREE AutoLISP tool helps you do exactly that — automatically.

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🎯 Main Purpose

The main purpose of this AutoLISP is to convert tap holes into blocks, so that tap quantities can be counted easily and accurately in AutoCAD.

After conversion, you can quickly count taps using:

• COUNT

• BCOUNT

• Data Extraction

• BOM workflows

Perfect for manufacturing preparation, drawing checking, and standardization.

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🔧 What This AutoLISP Can Do

✔️ Select multiple sample tap blocks (M2, M2.5, M3, M4, M5, etc.)
✔️ Automatically detect tap holes by radius
✔️ Distinguish between similar sizes using smart tolerance
✔️ Match each tap hole with the best-fit block
✔️ Remove old tap geometry (circle / arc / line)
✔️ Keep the exact center position
✔️ Convert taps into countable, standardized blocks

➡️ After running the tool, every tap hole in the drawing becomes easy to count.

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⚙️ How to Use

1️⃣ Load the AutoLISP file into AutoCAD
2️⃣ Run command: BC
3️⃣ Select sample tap blocks (select one by one, press Enter to finish)
4️⃣ Select the drawing area containing tap holes
5️⃣ Done 🎉 — tap holes are now blocks

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📊 Benefits After Conversion

• Fast and accurate tap counting

• No missing or duplicated taps

• Clean and standardized drawings

• Ideal for old drawings or drawings from multiple designers

• Reliable quantity calculation for production

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🧠 How It Works (Technical Overview)

• Reads circle / arc radius of tap holes

• Compares with sample block radii

• Uses adaptive tolerance to avoid wrong size matching

• Verifies surrounding geometry to prevent false detection

• Replaces detected tap geometry with the correct block

This is not a simple blind replacement script, but a logic-based AutoLISP designed for mechanical drawings.

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📥 Download 

• File: Auto block tap hole (AutoLISP)

• Free for personal and professional use

• No lock, no license, no limitation

If you frequently work with tap holes in AutoCAD, this tool can save you a lot of time.

https://drive.google.com/drive/u/1/folders/12MoWPXT-ti9UXi_ngcd4FcdZbDko2WF0 

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✍️ Notes

• Best suited for 2D tap holes

• Prepare standard tap blocks before running

• Tolerance values can be adjusted for different drawings

• After conversion, tap quantities can be extracted easily

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