{"id":2613,"date":"2026-08-26T17:28:20","date_gmt":"2026-08-26T09:28:20","guid":{"rendered":"https:\/\/www.sinopmt.com\/?p=2613"},"modified":"2026-09-14T15:28:18","modified_gmt":"2026-09-14T07:28:18","slug":"stainless-steel-cnc-machining-cost-reduction","status":"publish","type":"post","link":"https:\/\/www.sinopmt.com\/de\/stainless-steel-cnc-machining-cost-reduction\/","title":{"rendered":"Cylinder Cover Plate \u2014 Cost Reduction by Process Optimization"},"content":{"rendered":"
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CNC MACHINING CASE STUDY<\/p>

Stainless Steel CNC Machining Optimized for an SS304 Cover Plate<\/h2>

This case study shows how SPM improved stainless steel CNC machining<\/strong> for an SS304 cylinder cover plate by reviewing the complete production route instead of simply accepting an expensive finishing operation. The original process combined CNC turning and milling with double-side grinding to produce the required functional surface.<\/p>

The challenge was that the SS304 part was non-magnetic, and the double-side grinding process operated at only about three pieces per hour. Grinding alone cost US$4.68 per part, making it the largest single process cost. By replacing this operation with finish turning while retaining the core CNC turning and milling operations, total manufacturing cost fell from US$6.55 to US$2.80 per part \u2014 a reduction of 57.3%.<\/p><\/section>

Part Name
Cylinder Cover Plate<\/strong><\/div>
Material
SS304 Stainless Steel<\/strong><\/div>
Volume
500 pcs \/ month<\/strong><\/div>
Optimization Focus
Double-Side Surface Finishing<\/strong><\/div><\/div>

\"SS304<\/p>

MANUFACTURING CHALLENGE<\/p>

Why Double-Side Grinding Became the Main Cost Driver<\/h2>

At first glance, this component appears relatively straightforward. CNC turning and milling establish the primary geometry, followed by finishing of the two main surfaces. However, the economics of stainless steel CNC machining<\/strong> are not determined by geometric complexity alone. A seemingly simple finishing requirement can become the dominant cost when the selected process is slow or poorly matched to the material and production volume.<\/p>

In the original production route, the non-magnetic SS304 component required double-side grinding after the main CNC operations. The grinding process ran at approximately three pieces per hour and added US$4.68 to every component. By comparison, CNC turning cost US$1.09 per part and CNC milling cost US$0.78.<\/p>

This meant the finishing step cost considerably more than the two core machining processes combined. At a production volume of 500 pieces per month, repeating this low-efficiency operation in stainless steel CNC machining<\/strong> created a substantial recurring cost.<\/p>

Original Process<\/span><\/p>

Double-Side Grinding After CNC Machining<\/h3>

CNC turning:<\/strong> US$1.09 per part.<\/p>

CNC milling:<\/strong> US$0.78 per part.<\/p>

Double-side grinding:<\/strong> approximately 3 pcs\/hour and US$4.68 per part.<\/p>

Total:<\/strong> US$6.55 per part.<\/p><\/div>

Optimized<\/span><\/p>

Revised Process<\/span><\/p>

Finish Turning Replaced Grinding<\/h3>

CNC turning:<\/strong> retained at US$1.09 per part.<\/p>

CNC milling:<\/strong> retained at US$0.78 per part.<\/p>

Finish turning:<\/strong> added at US$0.93 per part.<\/p>

Total:<\/strong> reduced to US$2.80 per part.<\/p><\/div><\/div>

The objective was not simply to remove grinding. The revised process still had to produce the functional surface required by the component. The improvement came from identifying a more efficient way to create that surface within the existing machining route.<\/div><\/section>

PROCESS OPTIMIZATION<\/p>

How Stainless Steel CNC Machining Replaced the Grinding Operation<\/h2>

The process review started by looking at the function of the grinding operation rather than treating grinding itself as a mandatory requirement. The engineering question was straightforward: was double-side grinding essential to the component, or was it simply the original method selected to create the required surface?<\/p>

Once the finishing requirement was considered as part of the complete stainless steel CNC machining<\/strong> route, finish turning became a practical alternative. CNC turning and milling were already required to manufacture the part, so the revised route retained those operations and incorporated the final surface generation into machining instead of sending every component through a separate low-efficiency grinding process.<\/p>

01<\/b><\/p>

Review the Existing Process<\/strong>

Compare the cost and purpose of turning, milling and double-side grinding rather than evaluating each operation independently.<\/div><\/div>

02<\/b><\/p>

Identify the Cost Bottleneck<\/strong>

Double-side grinding operated at only about three pieces per hour and accounted for US$4.68 of the original US$6.55 unit cost.<\/div><\/div>

03<\/b><\/p>

Evaluate an Alternative Finishing Route<\/strong>

Finish turning was introduced to produce the required functional surface without the separate double-side grinding operation.<\/div><\/div>

04<\/b><\/p>

Retain Necessary Core Operations<\/strong>

CNC turning and milling remained part of the production route and their original costs remained unchanged.<\/div><\/div><\/div>

The result illustrates an important principle in stainless steel CNC machining<\/strong>: process optimization does not always require changing every operation. Sometimes the most effective improvement is to identify one disproportionately expensive step and determine whether its function can be achieved within another process that is already part of the manufacturing route.<\/p>

\"Batch<\/p><\/section>

SS304 PROCESS CONSIDERATIONS<\/p>

Why the Complete Machining Route Matters for SS304 Parts<\/h2>

SS304 is an austenitic stainless steel widely used in manufactured components. When planning stainless steel CNC machining<\/strong>, the material specification is only one part of the production decision. The sequence used to generate the geometry and functional surfaces can have an equally important effect on cost, particularly when a separate secondary finishing operation is required.<\/p>

Austenitic stainless steels also require appropriate machining practices. Technical guidance from the

Nickel Institute on machining austenitic chromium-nickel stainless steels
<\/a>
provides useful background on machining characteristics and practical considerations for this stainless-steel family.<\/p>

In this project, the SS304 specification itself was not changed. The optimization instead focused on how the required part was manufactured. This distinction matters because cost reduction should not automatically mean substituting the specified material or compromising a functional requirement. A better stainless steel CNC machining<\/strong> strategy can sometimes be achieved by changing the process sequence while keeping the required material and core component function intact.<\/p>

Process principle:<\/strong>
Review what each manufacturing operation must achieve before deciding how that operation should be performed. The required surface is the engineering objective; the original production method is not always the only route to achieve it.<\/div><\/section>

COST BREAKDOWN<\/p>

57.3% Cost Reduction Through Process Optimization<\/h2>

The financial effect of the revised stainless steel CNC machining<\/strong> route becomes significant at repeat-production volume. Eliminating US$4.68 of grinding cost and adding US$0.93 of finish turning produced a net saving of US$3.75 per component.<\/p>

US$22,500<\/strong><\/p>


saved per year at 6,000 pcs \/ year
57.3% unit cost reduction<\/p><\/div>

Per Part
US$6.55 \u2192 US$2.80<\/strong><\/div>
500 pcs \/ Month
US$3,275 \u2192 US$1,400<\/strong><\/div>
6,000 pcs \/ Year
US$39,300 \u2192 US$16,800<\/strong><\/div><\/div>
Process<\/th>Before (per pc)<\/th>After (per pc)<\/th>Change<\/th><\/tr><\/thead>
CNC Turning<\/td>US$1.09<\/td>US$1.09<\/td>Unchanged<\/td><\/tr>
CNC Milling<\/td>US$0.78<\/td>US$0.78<\/td>Unchanged<\/td><\/tr>
Double-Side Grinding<\/td>US$4.68<\/td>\u2014<\/td>Eliminated<\/td><\/tr>
Finish Turning<\/td>\u2014<\/td>US$0.93<\/td>Added<\/td><\/tr>
Total per part<\/td>US$6.55<\/td>US$2.80<\/td>\u221257.3%<\/td><\/tr>
Total 500 pcs \/ month<\/td>US$3,275<\/td>US$1,400<\/td>\u221257.3%<\/td><\/tr>
Total 6,000 pcs \/ year<\/td>US$39,300<\/td>US$16,800<\/td>\u221257.3%<\/td><\/tr><\/tbody><\/table><\/div>

CNC turning and milling did not become cheaper in the revised stainless steel CNC machining<\/strong> calculation; both remained exactly the same. The saving came from removing the US$4.68 double-side grinding operation and replacing it with US$0.93 of finish turning. This makes the source of the 57.3% reduction clear and avoids attributing the improvement to unrelated machining changes.<\/p><\/section>

WHY THIS APPROACH WORKED<\/p>

Optimize the Expensive Step, Not Every Step<\/h2>

Manufacturing cost reduction is sometimes approached by asking every supplier to reduce machining prices by a few percentage points. For this component, that strategy would have missed the main opportunity. Turning and milling together represented only US$1.87 of the original US$6.55 unit cost, while double-side grinding alone represented US$4.68.<\/p>

The larger opportunity was therefore not to negotiate a small reduction in CNC turning or milling. It was to reconsider why the expensive grinding operation existed and whether the same functional objective could be reached differently. Once finish turning was introduced, the grinding operation could be removed from the stainless steel CNC machining<\/strong> process sequence.<\/p>

Production quantity makes this type of review particularly relevant. A saving of US$3.75 may appear modest when looking at one component. At 500 parts per month, however, it becomes US$1,875 per month. Across 6,000 parts per year, the same process decision produces US$22,500 in annual savings.<\/p>

Good Review Candidates<\/span><\/p>

Look Closely at Secondary Operations<\/h3>