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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...

Entering vertical and lateral pitch for thumb 4.4.4   thumb   Thumb pitch works on the same principle as finger pitch — the hole is drilled at an angle rather than straight down, tilted to match the natural resting position of the bowler's thumb. However, t...

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...

Oval terminology: Starting Bit, Oval Width, Oval Degrees, Taper 5.1.2   glossary TODO — write this page. ```html Before working with Spectre Cloud's oval calculator, it helps to have a clear understanding of the four key terms used throughout the oval thum...

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...

Printing a spec sheet       Once a spec sheet is complete, you can print it directly from Spectre Cloud to use at the drill press, hand to a colleague, or file for your records. Spectre Cloud generates a clean, formatted printout that includes all measurem...

Entering span measurements (Full Span and Cut to Cut)                                                                 Span measurements define the distance between the thumb hole and each finger hole on a bowling ball. Spectre Cloud supports two primary sp...

Forward and lateral pitch for fingers 4.3.3   measurement                                 Pitch describes the angle at which each finger hole is drilled into the ball — not straight down, but tilted in a specific direction to match the natural resting ...

  CLT (Corrected lateral tilt) angle and its effect on lateral pitch                                   When a bowler places their hand on a ball during a fitting, the natural resting angle of the fingers is rarely perfectly vertical. Corrected Lateral T...