SV-1, explained
Compare estimated cost per part for a sample 4140 turning job. Select a cutting plan and batch size to see how the assumptions affect cost.
01 The job
Rough-turning 4140 alloy steel, a high-volume production part
Material
4140 · 28–32 HRC
Stock / part
3.66 in³
Machine
27 HP · flood
Shop rate
$90 / hr
02 Select a cutting plan
Each step changes one thing: the cut, then the inserts, then the machine. The first costs a subscription, the second consumables, the third capital. Tap to choose.
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Cost / part
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Machine time
Inserts
Tool changes
Machine capital
Kinzel
Cost per part, all four ways (tap a bar)
1.0 frontier · $0.13 / part · modeled reference
03 Estimated savings
Savings scale with the run. Choose a job size and the charts update.
Parts in this run
You save on this job
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Savings by move, this run
Estimated savings by batch size
The resource gap
The machine step is the only one that needs capital. Its cost per part above carries that capital at — for every hour the new machine runs. No single job pays for a machine; the book view shows what this one contributes.
A machine is justified across every job it runs, not one part. At this run, the machine step on this job contributes, before its share of the capital:
In the product, the contribution comes from your real job mix.
04 SV-1 and its reference cost
SV-1 divides a modeled reference cost by the modeled cost of each plan, using a standard rate of $90 per hour and the stated insert prices. Capital and subscription costs appear separately in the cost comparison. A score of 1.0 matches the model’s reference. It is not an experimentally established physical limit.
Your plan
vs. the frontier
vs. the frontier
—
A
B₁
B₂
C
1.0
How the numbers are built. Speed, feed and depth set the metal-removal rate and cutting power; tool life comes from the insert grade (Taylor); cost per part comes from shop rate, edge cost and tool-change time, and the new machine’s cost per part carries its capital: $130,000 recovered at 12% over 7 years, spread over 2,000 hours a year. Every plan that uses Kinzel carries its subscription the same way, $100 a machine a month spread over 2,000 hours a year. Savings are net of that subscription, the inserts you buy and that capital, and use this shop’s $90 rate. SV-1 prices the same time and edges at the standard rate instead, so it travels between shops. The 1.0 reference uses the machine and tooling assumptions defined in this example.
A sample 4140 turning job. Costs, tool life, and savings are illustrative estimates. · Kinzel · SV-1 · working draft.
A sample 4140 turning job. Costs, tool life, and savings are illustrative estimates. · Kinzel · SV-1 · working draft.