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Dual-Servo Multi-Spindle Drilling & Tapping Machine →Review the published specifications and configuration options against your part drawing before requesting a quote.
Map common hardware and dedicated details separately
Begin with the agreed fixture scope. Identify a common base, each variant's nest or locating details, any duplicate assemblies and commissioning costs included in the comparison. A component that looks shared may require modification between parts; confirm the actual coverage before placing its cost into a common pool. Record tooling and machine costs separately unless the chosen comparison deliberately includes them.
The fixture-deliverables guide covers what hardware and records are supplied. This article instead provides an original planning model for distributing an agreed cost. It is not a tax depreciation schedule or a supplier durability claim. Select the planning period and expected accepted production for each confirmed variant, then keep unsupported future parts outside the base calculation.
Choose a basis that reflects the comparison you need
Equal units are a simple allocation basis when one common fixture serves comparable work. Fixture occupation time can be more informative when variants occupy it for very different periods. Engineering effort may be relevant for a separately identified development cost pool. Do not switch the basis between alternatives merely because one creates a preferred answer; state the purpose and keep the method consistent.
Worked example with a shared base and three nests
The following figures are hypothetical monetary units, not a quote. Suppose the shared fixture base and included common work cost 6,000. Dedicated nests cost 1,000 for A, 1,500 for B and 500 for C. Planned accepted quantities are 20,000 A, 10,000 B and 5,000 C over the same horizon, totaling 35,000. Assume the purchased fixtures cover all those units with no replacement within this illustrative horizon; this assumption needs supplier and production review in a real project.
Using accepted units as weights assigns shared costs of 3,428.57 to A, 1,714.29 to B and 857.14 to C. Including their dedicated nests, each variant's fixture allocation per accepted unit is respectively 0.2214, 0.3214 and 0.2714. The common-base component is the same 6,000 / 35,000 = 0.1714 per unit; dedicated-nest costs create the difference. Calculate at full precision and round only displayed results so the allocation reconciles to the 9,000 total.
If occupation time is chosen instead, suppose the planned fixture times are 20,000, 20,000 and 10,000 minutes. The common pool then allocates 2,400, 2,400 and 1,200, and the variant unit figures become 0.1700, 0.3900 and 0.3400. The total remains 9,000. This changes the distribution, not the purchased fixture cost or the machine's capability. The invented times demonstrate a different allocation basis; they are not cycle-time estimates.
Test lost volume and replacement separately
Return to the unit-based model and reduce C's planned accepted quantity from 5,000 to 2,500, leaving A, B and the already-purchased hardware unchanged. Total volume becomes 32,500. The shared component rises to 6,000 / 32,500 = 0.1846 per accepted unit. A, B and C then carry approximately 0.2346, 0.3346 and 0.3846 per unit. C's dedicated nest is spread over fewer units while the common pool also changes for the other variants.
Keep this demand sensitivity separate from physical life. A nest replacement during the period adds an actual cost item with a stated timing and coverage assumption. A forecast reduction does not itself wear out a fixture, and lower volume does not guarantee its service life. Review locating elements, repair scope and replacement expectations with the supplier before building them into a long-range estimate.
For a family inquiry, send the drawings, expected mix and the intended shared-fixture concept. Ask which hardware is common, which details are dedicated and which variants remain unconfirmed. That evidence allows a cost allocation that can be revised when orders change, without presenting a forecast as a guaranteed hardware lifetime.
