# BALANCING

# Balancing

## ? **Balancing a Bowling Ball — Norms to Follow & Dodo Scale**

When a bowling ball is drilled, holes for the fingers and thumb remove material and shift its **center of gravity (CG)**.  
To ensure the ball remains **legal and properly balanced**, pro shops measure the ball’s static balance using a **dodo scale** and follow **USBC balance norms**.

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## ⚖️ **1. Norms to Follow — USBC Static Balance Rules**

The **United States Bowling Congress (USBC)** sets the official balance limits that all drilled bowling balls must meet.

### ? **USBC Legal Limits (Current as of 2025):**

<div class="_tableContainer_1rjym_1" id="bkmrk-type-of-weight-imbal"><div class="group _tableWrapper_1rjym_13 flex w-fit flex-col-reverse" tabindex="-1"><table class="w-fit min-w-(--thread-content-width)" data-end="1026" data-start="774"><thead data-end="831" data-start="774"><tr data-end="831" data-start="774"><th data-col-size="sm" data-end="801" data-start="774">Type of Weight Imbalance</th><th data-col-size="sm" data-end="831" data-start="801">Maximum Allowed Difference</th></tr></thead><tbody data-end="1026" data-start="892"><tr data-end="939" data-start="892"><td data-col-size="sm" data-end="919" data-start="892">**Top or Bottom Weight**</td><td data-col-size="sm" data-end="939" data-start="919">3 ounces maximum</td></tr><tr data-end="977" data-start="940"><td data-col-size="sm" data-end="958" data-start="940">**Side Weight**</td><td data-col-size="sm" data-end="977" data-start="958">3 ounce maximum</td></tr><tr data-end="1026" data-start="978"><td data-col-size="sm" data-end="1007" data-start="978">**Finger or Thumb Weight**</td><td data-col-size="sm" data-end="1026" data-start="1007">3 ounce maximum</td></tr></tbody></table>

</div></div>> ⚠️ **Weight holes (balance holes)** are no longer allowed — since August 1, 2020.  
> Only gripping holes (fingers and thumb) are permitted.

---

### ? **Static Weights Explained**

<div class="_tableContainer_1rjym_1" id="bkmrk-term-description-bal"><div class="group _tableWrapper_1rjym_13 flex w-fit flex-col-reverse" tabindex="-1"><table class="w-fit min-w-(--thread-content-width)" data-end="1676" data-start="1214"><thead data-end="1257" data-start="1214"><tr data-end="1257" data-start="1214"><th data-col-size="sm" data-end="1221" data-start="1214">Term</th><th data-col-size="sm" data-end="1235" data-start="1221">Description</th><th data-col-size="sm" data-end="1257" data-start="1235">Ball Motion Effect</th></tr></thead><tbody data-end="1676" data-start="1302"><tr data-end="1391" data-start="1302"><td data-col-size="sm" data-end="1319" data-start="1302">**Top Weight**</td><td data-col-size="sm" data-end="1357" data-start="1319">Weight above the ball’s center line</td><td data-col-size="sm" data-end="1391" data-start="1357">Helps delay hook (more length)</td></tr><tr data-end="1475" data-start="1392"><td data-col-size="sm" data-end="1412" data-start="1392">**Bottom Weight**</td><td data-col-size="sm" data-end="1450" data-start="1412">Weight below the ball’s center line</td><td data-col-size="sm" data-end="1475" data-start="1450">Promotes earlier roll</td></tr><tr data-end="1569" data-start="1476"><td data-col-size="sm" data-end="1494" data-start="1476">**Side Weight**</td><td data-col-size="sm" data-end="1533" data-start="1494">Difference between left/right halves</td><td data-col-size="sm" data-end="1569" data-start="1533">Affects flare and backend motion</td></tr><tr data-end="1676" data-start="1570"><td data-col-size="sm" data-end="1596" data-start="1570">**Finger/Thumb Weight**</td><td data-col-size="sm" data-end="1636" data-start="1596">Difference between upper/lower halves</td><td data-col-size="sm" data-end="1676" data-start="1636">Impacts roll and reaction smoothness</td></tr></tbody></table>

</div></div>**Norm:** Keep these weights **within limits** while achieving desired ball reaction.  
Excessive imbalance makes the ball illegal and unpredictable.

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## ⚙️ **2. Using a Dodo Scale to Measure Balance**

The **dodo scale** is a specialized tool used by pro shops to **measure static imbalances** (top, bottom, side, finger, and thumb weight) in ounces.

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### ? **Parts of a Dodo Scale**

- **Base Platform:** Holds the ball in place.
- **Balancing Arm / Beam:** Works like a scale arm with weights to measure imbalance.
- **Pivot Point / Knife Edge:** It allows the arm to move freely.
- **Indicator Dial / Counterweights:** Shows weight difference in ounces.

---

### ? **How to Use the Dodo Scale (Step-by-Step)**

1. **Find the Center of Gravity (CG):**
    
    
    - Marked on the ball by the manufacturer.
    - It’s the point used as the reference for all balance measurements.
2. **Measure Side Weight:**
    
    
    - Place the ball on the dodo scale so the CG is aligned horizontally (left to right).
    - Rotate the ball 90°.
    - The scale shows the difference between the right and left halves (in ounces).
    - Must be **≤ 3 oz**.
3. **Measure Finger/Thumb Weight:**
    
    
    - Rotate the ball so the CG is aligned vertically (top to bottom through the gripping holes).
    - The reading shows weight difference between finger and thumb sides.
    - Must be **≤ 3 oz**.
4. **Measure Top/Bottom Weight:**
    
    
    - Place the ball with the CG on top and measure the vertical imbalance.
    - Reading must be **≤ 3 oz**.
5. **Adjust If Needed:**
    
    
    - If imbalance exceeds the limit, adjust drilling depth or plug/redrill holes to bring the ball within legal range.

---

### ? **Norms When Using a Dodo Scale**

<div class="_tableContainer_1rjym_1" id="bkmrk-step-norm-%2F-best-pra"><div class="group _tableWrapper_1rjym_13 flex w-fit flex-col-reverse" tabindex="-1"><table class="w-fit min-w-(--thread-content-width)" data-end="3807" data-start="3405"><thead data-end="3436" data-start="3405"><tr data-end="3436" data-start="3405"><th data-col-size="sm" data-end="3412" data-start="3405">Step</th><th data-col-size="md" data-end="3436" data-start="3412">Norm / Best Practice</th></tr></thead><tbody data-end="3807" data-start="3470"><tr data-end="3534" data-start="3470"><td data-col-size="sm" data-end="3488" data-start="3470">Before Drilling</td><td data-col-size="md" data-end="3534" data-start="3488">Record factory top weight and CG location.</td></tr><tr data-end="3607" data-start="3535"><td data-col-size="sm" data-end="3552" data-start="3535">After Drilling</td><td data-col-size="md" data-end="3607" data-start="3552">Check all three balances (top, side, finger/thumb).</td></tr><tr data-end="3688" data-start="3608"><td data-col-size="sm" data-end="3621" data-start="3608">Adjustment</td><td data-col-size="md" data-end="3688" data-start="3621">Stay comfortably *below* USBC max limits (not exactly at them).</td></tr><tr data-end="3745" data-start="3689"><td data-col-size="sm" data-end="3705" data-start="3689">Documentation</td><td data-col-size="md" data-end="3745" data-start="3705">Record final readings for reference.</td></tr><tr data-end="3807" data-start="3746"><td data-col-size="sm" data-end="3761" data-start="3746">Verification</td><td data-col-size="md" data-end="3807" data-start="3761">Test-roll to confirm expected ball motion.</td></tr></tbody></table>

</div></div>---

## ⚙️ **3. Why Balancing Matters**

Proper balance ensures that:

- The ball **rolls evenly and predictably**.
- The **core orientation** performs as designed.
- The ball is **USBC-legal** for competition.

Unbalanced or illegal balls can:

- React unpredictably on the lane.
- Violate competition standards.
- Affect the bowler’s release or control.

---

## ✅ **Summary — Norms to Follow**

<div class="_tableContainer_1rjym_1" id="bkmrk-category-norm-%2F-stan"><div class="group _tableWrapper_1rjym_13 flex w-fit flex-col-reverse" tabindex="-1"><table class="w-fit min-w-(--thread-content-width)" data-end="4704" data-start="4213"><thead data-end="4257" data-start="4213"><tr data-end="4257" data-start="4213"><th data-col-size="sm" data-end="4224" data-start="4213">Category</th><th data-col-size="sm" data-end="4242" data-start="4224">Norm / Standard</th><th data-col-size="sm" data-end="4257" data-start="4242">Measured By</th></tr></thead><tbody data-end="4704" data-start="4305"><tr data-end="4381" data-start="4305"><td data-col-size="sm" data-end="4326" data-start="4305">**Static Balance**</td><td data-col-size="sm" data-end="4367" data-start="4326">3 oz top, 3 oz side, 3 oz finger/thumb</td><td data-col-size="sm" data-end="4381" data-start="4367">Dodo Scale</td></tr><tr data-end="4470" data-start="4382"><td data-col-size="sm" data-end="4404" data-start="4382">**Dynamic Balance**</td><td data-col-size="sm" data-end="4444" data-start="4404">Proper core layout and reaction shape</td><td data-col-size="sm" data-end="4470" data-start="4444">Dual Angle / CAD tools</td></tr><tr data-end="4548" data-start="4471"><td data-col-size="sm" data-end="4490" data-start="4471">**Physical Fit**</td><td data-col-size="sm" data-end="4521" data-start="4490">Comfortable grip and pitches</td><td data-col-size="sm" data-end="4548" data-start="4521">Fit tools / Pro fitting</td></tr><tr data-end="4621" data-start="4549"><td data-col-size="sm" data-end="4572" data-start="4549">**No Balance Holes**</td><td data-col-size="sm" data-end="4608" data-start="4572">Only finger &amp; thumb holes allowed</td><td data-col-size="sm" data-end="4621" data-start="4608">USBC Rule</td></tr><tr data-end="4704" data-start="4622"><td data-col-size="sm" data-end="4649" data-start="4622">**Check After Drilling**</td><td data-col-size="sm" data-end="4678" data-start="4649">Verify legality before use</td><td data-col-size="sm" data-end="4704" data-start="4678">Dodo Scale Measurement</td></tr></tbody></table>

</div></div>---

### ? **In Short**

> “Balancing a bowling ball” means making sure it meets **USBC static balance limits** and rolls as intended.  
> The **dodo scale** is the key tool used to **measure and confirm** those weight differences after drilling.
> 
> [![POWERPNT_HRjSTq6uuq.png](https://wiki.spectrebowling.com/uploads/images/gallery/2025-10/scaled-1680-/powerpnt-hrjstq6uuq.png)](https://wiki.spectrebowling.com/uploads/images/gallery/2025-10/powerpnt-hrjstq6uuq.png)

# Weighing the ball

To weigh a bowling ball using a **Dodo scale**, follow these steps:

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### 1. **Set Up the Scale**

Place the Dodo scale on a flat, stable surface. Ensure it's turned on and calibrated to zero.

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### 2. **Position the Ball**

Place the bowling ball on the scale's cradle, ensuring it's centered and stable.

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### 3. **Read the Display**

The scale will display the weight of the ball. Note the reading in ounces or grams.

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### 4. **Calculate the Weight**

If the reading is in ounces, divide by 16 to convert to pounds. If in grams, divide by 1000 to convert to kilograms.

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### 5. **Verify Accuracy**

For precision, repeat the measurement and check for consistency.

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The Dodo scale is a specialized tool used in bowling to measure static imbalances in a ball, such as side, finger, and thumb weights. These measurements are crucial for customizing the ball's layout to match a bowler's style and preferences. However, for general weight measurements, a standard scale may suffice.

**Here are the 6 steps for weighing your bowling balls with the dodo scale .....**

**STEP 1 :**

[![POWERPNT_WuWRuMm6RL.png](https://wiki.spectrebowling.com/uploads/images/gallery/2025-10/scaled-1680-/powerpnt-wuwrumm6rl.png)](https://wiki.spectrebowling.com/uploads/images/gallery/2025-10/powerpnt-wuwrumm6rl.png)

**STEP 2 :**

[![POWERPNT_Z3Z806qVgT.png](https://wiki.spectrebowling.com/uploads/images/gallery/2025-10/scaled-1680-/powerpnt-z3z806qvgt.png)](https://wiki.spectrebowling.com/uploads/images/gallery/2025-10/powerpnt-z3z806qvgt.png)

**STEP 3 :**

[![POWERPNT_W6M8fNhxHd.png](https://wiki.spectrebowling.com/uploads/images/gallery/2025-10/scaled-1680-/powerpnt-w6m8fnhxhd.png)](https://wiki.spectrebowling.com/uploads/images/gallery/2025-10/powerpnt-w6m8fnhxhd.png)

**STEP 4 :**

[![POWERPNT_7p1HISMFmG.png](https://wiki.spectrebowling.com/uploads/images/gallery/2025-10/scaled-1680-/powerpnt-7p1hismfmg.png)](https://wiki.spectrebowling.com/uploads/images/gallery/2025-10/powerpnt-7p1hismfmg.png)

**STEP 5 :**

[![POWERPNT_jYN5LygstJ.png](https://wiki.spectrebowling.com/uploads/images/gallery/2025-10/scaled-1680-/powerpnt-jyn5lygstj.png)](https://wiki.spectrebowling.com/uploads/images/gallery/2025-10/powerpnt-jyn5lygstj.png)

**STEP 6 :**

[![POWERPNT_KTLP5gkgKi.png](https://wiki.spectrebowling.com/uploads/images/gallery/2025-10/scaled-1680-/powerpnt-ktlp5gkgki.png)](https://wiki.spectrebowling.com/uploads/images/gallery/2025-10/powerpnt-ktlp5gkgki.png)

### ✅ **Final Tips**

- **Verify Weight After Drilling**: Drilling the ball for finger holes can slightly alter its weight. Always weigh the ball after drilling to ensure it meets your specifications.
- **Consult Professionals**: For personalized recommendations, consult with a certified bowling coach or professional shop.