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2.2.6 Vacu Installation Increment from O.D. (1/32, 1/16…)

Vacu Installation Increment from O.D. (1/32, 1/16…)

2.2.6   default

 

When fitting a bowler with VACU Grip inserts, Spectre Cloud needs to calculate the correct hole size relative to the insert's outer diameter (O.D.). The hole must be drilled slightly undersized so the insert creates a vacuum seal — too loose and the insert won't hold; too tight and it won't seat correctly. This setting controls how finely the O.D. offset selector steps through available sizes when building a VACU spec.

Note: This setting only appears and applies if your shop uses VACU Grip installation. If your shop drills exclusively STD (glued) inserts, this setting has no effect on your workflow.

📐 What Is the O.D. Increment?

The O.D. (outer diameter) increment is the step size used in the VACU hole size selector — the amount by which the displayed offset increases or decreases with each click or tap. Spectre Cloud offers three options:

  • ✅ 1/32" — the finest available increment. The selector steps one thirty-second of an inch at a time (e.g. 7/32", 8/32", 9/32"…). Gives maximum control over the vacuum fit, particularly useful for bowlers with sensitive grip requirements or when working with a brand of insert known for tight manufacturing tolerances.
  • ✅ 1/16" — a mid-range increment. Steps two thirty-seconds at a time (e.g. 3/16", 4/16", 5/16"…). A good all-round choice that balances speed of entry with sufficient precision for most VACU fittings.
  • ✅ 1/8" — the coarsest increment. Steps four thirty-seconds at a time (e.g. 1/8", 2/8", 3/8"…). The fastest to navigate and sufficient for shops where VACU hole sizing follows broad, established size bands.

⚙️ Changing the VACU O.D. Increment

  1. Open Spectre Cloud at cloud.spectrebowling.com and log in.
  2. Click your pro shop name in the top-right corner to open the Profile menu.
  3. Select Settings from the dropdown.
  4. Navigate to the Spec Sheet Defaults section.
  5. Locate the VACU O.D. Increment field and select 1/32", 1/16", or 1/8".
  6. Click Save to apply the change.

🎳 Which Increment Should You Choose?

Situation Recommended Increment Reason
Precision VACU fitting, competitive bowlers 1/32" Fine control matters when a bowler's vacuum fit needs to be dialled in exactly
General VACU fitting, mixed clientele 1/16" Covers most practical sizing needs without excessive scrolling
High-volume shop, standard insert sizes only 1/8" Fastest entry when insert sizes reliably fall on broad size boundaries
Unsure — new to VACU fittings 1/32" Start fine; it's easier to work at coarser sizes mentally than to miss a value you need

📌 Important: O.D. vs. Hole Size

It is worth clarifying the relationship between the insert O.D. and the drilled hole size for VACU installation:

  • The insert O.D. is the published outer diameter of the VACU insert itself — a fixed measurement from the manufacturer.
  • The drilled hole must be cut smaller than the insert O.D. by a controlled amount so the insert compresses slightly on insertion and forms a vacuum seal.
  • Spectre Cloud uses the O.D. increment setting to let you step through that offset value — the difference between insert O.D. and hole size — with the precision your shop requires.
  • ❌ Do not confuse the O.D. increment with the finger hole size itself — they are different measurements.

Tip: If you switch insert brands, check the new brand's recommended hole offset specification. Some brands require a tighter or looser offset than others — you may find that switching brands is a good time to revisit this increment setting.

  • 2.2.5 — Insert Installation: STD vs. VACU Grip as the Default
  • 2.2.3 — Display in Decimal vs. Fractional
  • 4.4 — Insert Fields on a Spec Sheet
  • 6.1 — Drilling Your First Ball: Step-by-Step Overview

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