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What is an oval thumb hole and why is it used? 5.1.1   KEY   concept   Most bowling balls are drilled with round holes — circular in cross-section, sized to fit the bowler's thumb or fingers at the point of insertion. For many bowlers, a well-fitted round h...

Vertical cut (V) vs. Horizontal cut (H) — what they mean physically 5.1.3   concept   When making oval cuts at the drill press, the operator physically moves the ball relative to the drill bit along one of two axes to remove material and elongate the pilot ...

How oval degree affects pitch inside the oval 5.1.4   concept   When a thumb hole is round, vertical pitch and lateral pitch act independently — each one influences the thumb along its own axis without affecting the other. When the hole is oval, this indepe...

What is the Arsenal section and how it connects to spec sheets 7.1.1   concept   The Arsenal is Spectre Cloud's ball inventory system — a per-bowler record of every piece of equipment they have had drilled at your shop. Where spec sheets capture the how of ...

4.1.2   concept The span type setting on a Spectre Cloud spec sheet defines the measurement convention used to record the distance between the finger holes and the thumb hole. Choosing the right span type — and understanding what each one measures — ensures s...

4.1.3   concept A bowler's grip type defines how deeply their fingers are inserted into the ball — and it is one of the most consequential decisions in a pro shop fitting. Grip type determines the standard span, pitch, bridge, and insert values that apply to ...

4.1.4   concept Pitch is the angle at which a finger or thumb hole is drilled relative to the ball's center. It affects grip comfort, how securely the ball is held through the swing, and how cleanly it releases. In Spectre Cloud, you set pitch for each hole u...

4.1.5   concept The bridge is the distance between the near edges of the middle and ring finger holes on a drilled ball — the strip of material, or land area, that holds the two finger holes apart. It's one of the smallest measurements on a spec sheet, but it...

4.1.6   concept When drilling finger holes for bowlers who use inserts, the drill bit must match the insert's Outside Diameter (OD) — the outer dimension that sets the hole size. Spectre Cloud sizes these holes for you through Autofill Insert OD (2.6.6). This...

4.4.3   concept Finger inserts seat in one of two ways — STD (Standard) or VACU (Vacuum). The insert type you record on the sheet (see 4.4.2) tells Spectre Cloud how the hole is drilled. This page explains the difference. For the OD-sizing concept, see 4.1.6....

4.3.2   concept Spectre Cloud supports four span types — Full Span (F), Cut to Cut (C), Outer to Cut (O), and Hole to Hole (H). All four measure the distance between the finger holes and the thumb hole, but they differ in where the measurement begins and ends...