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4.5.1 Selecting the thumb hole shape (Round or Oval)
4.5.1 thumb The thumb is the largest hole on the ball and the primary control point for the release. Before entering thumb measurements, the spec sheet asks you to set the thumb hole shape — Round or Oval. This choice affects only how you define the hole si...
4.5.2 Entering thumb hole size
4.5.2 thumb For a round thumb, the hole size is a single value entered on the spec sheet. The thumb section records both the O.D. (the drill/hole size) and, when a thumb insert or slug is used, the hole size the bowler's thumb actually sits in — the two are...
4.5.3 Entering vertical and lateral pitch for thumb
4.5.3 measurement Thumb pitch works exactly like finger pitch — you enter it into the pitch tiles around the thumb hole, and the tile is the direction. There's no direction to select from a dropdown. For the full mechanics of the pitch tiles, see 4.4.3; f...
4.5.4 Thumb insert type and size
4.5.4 thumb Many bowlers use a thumb slug or thumb insert rather than a bare thumb hole. This page covers recording the thumb insert on the spec sheet. The physical installation (drilling the pilot hole, seating, adhesive, finishing) follows your shop's sta...
4.6.1 Selecting an oval thumb: starting bit, oval width, oval degree, and taper
4.6.1 oval An oval thumb hole needs four inputs beyond the standard thumb measurements. Together they define the shape, orientation, and profile of the finished oval so Spectre Cloud can generate the drilling sequence. The calculation mechanics live in the ...
4.6.2 Entering the oval inputs (step-by-step)
4.6.2 oval This page is the step-by-step companion to 4.6.1. The four oval inputs — starting bit, oval width, oval degree, and taper — are defined in 4.6.1, and the calculation that turns them into drilling movements is covered in 4.6.3 and the Oval Calcula...
4.6.3 How the system calculates the oval cut from your inputs
4.6.3 oval Once the four oval inputs are entered, Spectre Cloud calculates the drilling instructions — a set of x-axis and y-axis offset movements that tell you how to reposition the ball relative to the bit to open the round pilot hole into the correct ova...
4.3.2 The four span types: F, C, O, H
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...