2.3.2 Initial pitch inside the total oval — EDGE vs. CENTER method
Initial pitch inside the total oval — EDGE vs. CENTER method
2.3.2 oval
When drilling an oval hole, the software needs a reference point from which to calculate the initial pitch of that hole. Because an oval opening has width — unlike a round hole, which has a single center point — there are two valid ways to define that reference. This setting lets you choose which method Spectre Cloud uses by default when building spec sheets that include oval holes.
📐 The Two Methods Explained
Edge Method
The Edge method measures initial pitch from the near edge of the oval opening — that is, the edge closest to the bowler's palm. This is the traditional approach used by most pro shop operators and mirrors the convention used when measuring round holes, where the drill bit enters at a defined edge reference.
- ✅ Consistent with how round hole pitch has historically been measured
- ✅ Familiar to operators trained on conventional pitch measurement techniques
- ✅ Preferred default for shops transitioning from round-only workflows
- ❌ Can introduce slight inconsistency as oval width increases, since the near edge shifts further from the hole's geometric center
Center Method
The Center method measures initial pitch from the geometric center of the oval opening. This is a mathematically consistent reference point regardless of how wide the oval is, making it more reliable when working with larger or custom oval sizes.
- ✅ Consistent reference regardless of oval width
- ✅ Preferred for shops that frequently work with larger ovals or advanced custom fitting
- ✅ Eliminates edge-shift error on wide ovals
- ❌ Less intuitive for operators accustomed to traditional edge-based measurement
- ❌ Requires understanding of oval geometry to use confidently
📊 Method Comparison at a Glance
| Factor | Edge Method | Center Method |
|---|---|---|
| Reference point | Near edge of oval opening | Geometric center of oval opening |
| Consistency across oval sizes | Varies with oval width | Consistent regardless of width |
| Familiarity | Traditional / widely taught | Modern / geometry-based |
| Best suited for | Standard ovals, mixed workflows | Large ovals, advanced custom fitting |
| Risk of error on wide ovals | Higher | Lower |
🛠️ How to Change This Setting
- Click your Profile name in the top-right corner of the screen.
- Navigate to Settings.
- Open the Spec Sheet Defaults section (Chapter 2.3).
- Locate the