05 Oval Calculator
All methods · Settings variations · Calculations
5.1 — Understanding the Oval
5.1.1 What is an oval thumb hole and why is it used?
What is an oval thumb hole and why is it used? 5.1.1 KEY concept Most bowling balls are ...
5.1.2 Oval terminology: Starting Bit, Oval Width, Oval Degrees, Taper
Oval terminology: Starting Bit, Oval Width, Oval Degrees, Taper 5.1.2 glossary TODO — write t...
5.1.3 Vertical cut (V) vs. Horizontal cut (H) — what they mean physically
Vertical cut (V) vs. Horizontal cut (H) — what they mean physically 5.1.3 concept When mak...
5.1.4 How oval degree affects pitch inside the oval
How oval degree affects pitch inside the oval 5.1.4 concept When a thumb hole is round, ve...
5.2 — Method A: V/H Mode (Most Common)
5.2.1 Setting up: Oval Cut Direction = V/H in Settings
Setting up: Oval Cut Direction = V/H in Settings 5.2.1 CALC oval method Before using the...
5.2.2 Entering Starting Bit and Oval Width — Bit Size mode
Entering Starting Bit and Oval Width — Bit Size mode 5.2.2 oval method When using the Oval...
5.2.3 Entering Starting Bit and Oval Width — Decimal mode
Entering Starting Bit and Oval Width — Decimal mode 5.2.3 oval method When using the Oval ...
5.2.4 Reading the DIFF (decimal difference) auto-calculation
Reading the DIFF (decimal difference) auto-calculation 5.2.4 oval method Whenever you ente...
5.2.5 Adding oval cut rows using the + button
Adding oval cut rows using the + button 5.2.5 oval method The Oval Calculator in Spectre C...
5.2.6 Entering V and H cut values (positive and negative)
Entering V and H cut values (positive and negative) 5.2.6 oval method When recording oval ...
5.2.7 Confirming cuts using the arrow-down key
Confirming cuts using the arrow-down key 5.2.7 oval method After entering V and H cut valu...
5.2.8 Worked example: full V/H oval from start to finish
Worked example: full V/H oval from start to finish 5.2.8 TIP example This page walks thr...
5.3 — Method B: Horizontal Only (H Mode)
5.3.1 Setting up: Oval Cut Direction = H in Settings
Setting up: Oval Cut Direction = H in Settings 5.3.1 CALC oval method Before using the O...
5.3.2 When to use H-only mode and which drill presses it suits
When to use H-only mode and which drill presses it suits 5.3.2 oval method H-only mode in ...
5.3.3 Entering H-only cut values and reading output
Entering H-only cut values and reading output 5.3.3 oval method Once your Oval Cut Directi...
5.3.4 Worked example: H-only oval
Worked example: H-only oval 5.3.4 TIP example This page walks through a complete H-only ...
5.4 — Method C: Vertical Only (V Mode)
5.4.1 Setting up: Oval Cut Direction = V in Settings
Setting up: Oval Cut Direction = V in Settings 5.4.1 CALC oval method The third Oval Cut...
5.4.2 When to use V-only mode
When to use V-only mode 5.4.2 oval method V-only mode is the right configuration when your...
5.4.3 Entering V-only cut values and reading output
Entering V-only cut values and reading output 5.4.3 oval method With Oval Cut Direction se...
5.5 — Method D: Manual / NONE Mode
5.5.1 Setting up: Oval Cut Direction = NONE in Settings
Setting up: Oval Cut Direction = NONE in Settings 5.5.1 oval method Before using the Oval ...
5.5.2 Using the oval cut chart to determine cuts manually
Using the oval cut chart to determine cuts manually 5.5.2 oval method When your Oval Cut D...
5.5.3 When NONE mode is preferable (experienced fitters, custom setups)
When NONE mode is preferable (experienced fitters, custom setups) 5.5.3 oval method Spectr...
5.6 — Pitch Inside the Oval: EDGE vs. CENTER
5.6.1 EDGE method explained — how pitch is placed at edge of oval
EDGE method explained — how pitch is placed at edge of oval 5.6.1 pitch The EDGE method is...
5.6.2 CENTER method explained — how pitch is placed at center of oval
CENTER method explained — how pitch is placed at center of oval 5.6.2 pitch The CENTER met...
5.6.3 EDGE with and without Add Pitch Thumb — comparison
EDGE with and without Add Pitch Thumb — comparison 5.6.3 pitch When using the EDGE method ...
5.6.4 CENTER with and without Add Pitch Thumb — comparison
CENTER with and without Add Pitch Thumb — comparison 5.6.4 pitch Just as the EDGE method c...
5.6.5 Choosing EDGE vs. CENTER: which method fits which bowler?
Choosing EDGE vs. CENTER: which method fits which bowler? 5.6.5 TIP guide With four calc...
5.6.6 1° vs. 5° Oval Degree increments and their precision impact
1° vs. 5° Oval Degree increments and their precision impact 5.6.6 pitch When Spectre Cloud...
5.7 — Flip V/H and Drill Press Orientation
5.7.1 Using "Flip V/H on oval cuts" to match your machine's axis
Using "Flip V/H on oval cuts" to match your machine's axis 5.7.1 calibration When Spectre ...
5.7.2 Worked example: how flipping V/H changes the output numbers
Worked example: how flipping V/H changes the output numbers 5.7.2 example The previous pag...