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Viewing a bowler's complete spec sheet history 3.2.4   manage Every spec sheet ever saved for a bowler in Spectre Cloud is retained in their spec sheet history — a chronological record of every ball drilled, every measurement recorded, and every layout app...

Viewing a bowler's full arsenal (all balls on file) 3.2.5   manage   A bowler's arsenal is the complete collection of bowling balls associated with their profile in Spectre Cloud — every ball they own, have drilled, or have on record with your shop. The ars...

Understanding acronyms: F (Full Span), C (Cut to Cut), O (Oval)… 4.1.1   glossary   Spectre Cloud uses a set of standard acronyms throughout spec sheets, settings, and the oval calculator to refer to span types, measurement conventions, and drilling operati...

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...

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...

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 ...

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...

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...

Naming a spec sheet (ball name, date, notes) 4.2.2   step-by-step   When you create a new spec sheet, Spectre Cloud asks you to identify the ball and add any relevant context before drilling details are entered. The three fields — ball name, date, and notes...

How to identify the type of grip from measurement sheet 4.2.4   step-by-step   Before entering span and pitch measurements into a spec sheet, you need to identify which grip type the bowler uses. The grip type determines how the fingers sit in the ball and ...

Cloning a spec sheet to preserve old measurements 4.2.5   TIP   step-by-step   When a bowler returns to have a new ball drilled with the same layout and measurements as a previous ball, cloning a spec sheet saves time and prevents transcription errors. ...

Insert type and size: STD vs. VACU, selecting drill bit OD 4.3.7   measurement   Once span, pitch, and oval measurements are recorded, the spec sheet needs to know what is going into the finger holes — bare finger, a standard insert, or a VACU-style insert ...

Selecting "Round" thumb hole on the spec sheet 4.4.1   thumb   The thumb hole is the largest hole on the ball and the one most responsible for the bowler's ability to release cleanly and consistently. Before entering thumb measurements, the spec sheet requi...

Entering thumb hole size 4.4.2   thumb   Once the thumb hole shape is selected, the spec sheet requires the actual size of the thumb hole. Whether the bowler uses a bare thumb, a slug, or an insert, the size entry tells Spectre Cloud — and ultimately the dr...

Entering bowler's span (Full and Cut to Cut) 4.4.3   thumb This page walks through the process of entering a bowler's span measurements into the Spectre Cloud spec sheet form. For a full explanation of the difference between Full Span and Cut to Cut me...

Installing a pre-drilled thumb insert 4.4.5   thumb   A pre-drilled thumb insert arrives from the manufacturer already bored to a standard inner diameter. Rather than drilling the thumb hole to the bowler's exact size and shaping it in place, the operator s...

Selecting "Oval" thumb hole on the spec sheet 4.5.1   KEY   oval     Drilling an oval thumb hole requires more setup information than a round hole. In addition to the standard thumb measurements, Spectre Cloud needs four oval-specific inputs to generate th...

How the system calculates the oval cut from your inputs 4.5.3   oval   Once the four oval inputs — starting bit, oval width, oval degrees, and taper — have been entered into the spec sheet, Spectre Cloud calculates the drilling instructions needed to produc...

Entering thumb oval span and pitch information 4.5.4   oval   For most spec sheets, span is measured and entered the same way regardless of thumb hole shape. Oval thumb holes introduce one specific scenario where the entered span requires an adjustment — wh...

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...