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4.1.2 Span types explained: Full Span vs. Cut to Cut vs. Oval Span
Span types explained: Full Span vs. Cut to Cut vs. Oval Span 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...
4.1.3 Grip type definitions: Finger Tip vs. Conventional
Grip type definitions: Finger Tip vs. Conventional 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 standar...
4.1.4 Pitch terminology: Forward, Reverse, Lateral, Zero pitch explained
Pitch terminology: Forward, Reverse, Lateral, Zero pitch explained 4.1.4 concept Pitch is the angle at which a finger or thumb hole is drilled relative to the centre of the ball. Adjusting pitch changes how the bowler's finger or thumb sits in the hole ...
4.1.5 Bridge: standard bridge sizes and their purpose
Bridge: standard bridge sizes and their purpose 4.1.5 concept The bridge is the distance between the near edges of the middle and ring finger holes on a drilled bowling ball. It is one of the smallest measurements on a spec sheet — typically between 3/1...
4.1.6 Insert OD: drill bit sizing for STD and VACU grips
Insert OD: drill bit sizing for STD and VACU grips 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 of the insert that determines the hole size requir...
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 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...
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 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 ...
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, 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...
7.1.1 What is the Arsenal section and how it connects to spec sheets
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 ...