{"id":2619,"date":"2026-08-26T17:28:42","date_gmt":"2026-08-26T09:28:42","guid":{"rendered":"https:\/\/www.sinopmt.com\/?p=2619"},"modified":"2026-09-14T15:47:26","modified_gmt":"2026-09-14T07:47:26","slug":"stainless-steel-shaft-machining","status":"publish","type":"post","link":"https:\/\/www.sinopmt.com\/de\/stainless-steel-shaft-machining\/","title":{"rendered":"SS316 Shaft \u2014 Cost Reduction by Design Optimization"},"content":{"rendered":"
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CNC MACHINING CASE STUDY<\/p>\n\n

Stainless Steel Shaft Machining Optimized for Material Use and Production Cost<\/h2>\n\n

\n This case study shows how SPM improved stainless steel shaft machining<\/strong> for an SS316 component by reviewing the original part design, raw-material usage and machining route before repeat production. The customer’s original design required 22.56 kg of SS316 material per shaft and included a separate \u00d812.7 mm deep-hole drilling operation.\n <\/p>\n\n

\n Instead of treating the existing drawing as a fixed manufacturing route, the engineering review focused on a practical question: which features were essential to the shaft’s function, and which parts of the original process were creating avoidable cost? The revised design reduced raw-material weight to 7.8 kg per part and removed the separate deep-hole drilling operation while retaining CNC turning and milling. The resulting unit cost fell from US$159.30 to US$50.35, a reduction of 68.4%.\n <\/p>\n\n<\/section>\n\n\n

\n\n
\n Part Name<\/span>\n SS316 Shaft<\/strong>\n <\/div>\n\n
\n Material<\/span>\n SS316 Stainless Steel<\/strong>\n <\/div>\n\n
\n Volume<\/span>\n 50 pcs \/ month<\/strong>\n <\/div>\n\n
\n Main Process<\/span>\n Turning, milling & optimized drilling route<\/strong>\n <\/div>\n\n<\/div>\n\n\n\"Finished\n\n\n
\n\n

MANUFACTURING CHALLENGE<\/p>\n\n

Why the Original Shaft Design Was Expensive to Produce<\/h2>\n\n

\n In this stainless steel shaft machining<\/strong> project, the main cost issue was not a single expensive machining operation. It was the combined effect of high SS316 material consumption, a separate deep-hole drilling step and the amount of turning required to remove excess stock. In the original design, each shaft started with 22.56 kg of stainless steel. For a repeat-production component, that amount of material had a direct effect on cost before machining even began.\n <\/p>\n\n

\n The original process also required a dedicated \u00d812.7 mm deep-hole drilling operation at US$7.80 per part. Although that figure was smaller than the raw-material cost, it still added another manufacturing step, additional handling and a separate operation to the routing. For stainless steel shaft machining<\/strong>, these accumulated process costs matter because the commercial result is determined by the complete production route rather than machine time alone.\n <\/p>\n\n\n

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\n\n Original Design<\/span>\n\n

High Material Use and Separate Deep-Hole Drilling<\/h3>\n\n

\n Material use:<\/strong> 22.56 kg of SS316 per part.\n <\/p>\n\n

\n Raw material cost:<\/strong> US$101.50 per part.\n <\/p>\n\n

\n Deep-hole drilling:<\/strong> Separate \u00d812.7 mm operation costing US$7.80 per part.\n <\/p>\n\n

\n Turning cost:<\/strong> US$43.75 per part.\n <\/p>\n\n <\/div>\n\n\n

\n\n Optimized<\/span>\n\n Revised Design<\/span>\n\n

Lower Material Use with a Simpler Process Route<\/h3>\n\n

\n Material use:<\/strong> reduced to 7.8 kg per part.\n <\/p>\n\n

\n Raw material cost:<\/strong> reduced to US$36.90 per part.\n <\/p>\n\n

\n Deep-hole drilling:<\/strong> separate operation eliminated.\n <\/p>\n\n

\n Turning cost:<\/strong> reduced to US$7.20 per part.\n <\/p>\n\n <\/div>\n\n <\/div>\n\n\n

\n The redesign reduced SS316 raw-material consumption and removed one separate machining operation without changing the core functional requirements described for the shaft.\n <\/div>\n\n<\/section>\n\n\n
\n\n

DESIGN & PROCESS OPTIMIZATION<\/p>\n\n

How the Stainless Steel Shaft Machining Route Was Simplified<\/h2>\n\n

\n The optimization started with the part design rather than with a request to increase cutting speed or shorten cycle time. This distinction is important. If a design inherently requires too much stock, a large amount of machining time is already committed before the first toolpath is programmed. Reducing that unnecessary material can therefore create a larger saving than trying to make an inefficient route run slightly faster.\n <\/p>\n\n

\n In the revised stainless steel shaft machining<\/strong> plan, the material requirement fell from 22.56 kg to 7.8 kg. That is a 65.4% reduction in raw-material weight. The raw-material cost consequently dropped from US$101.50 to US$36.90 per part, a 63.6% reduction.\n <\/p>\n\n\n

\n\n
\n\n 01<\/b>\n\n
\n Review Material Usage<\/strong>\n \n Identify how much of the original SS316 stock becomes finished part and how much is removed during machining.\n <\/span>\n <\/div>\n\n <\/div>\n\n\n
\n\n 02<\/b>\n\n
\n Review Functional Geometry<\/strong>\n \n Separate features that are necessary for part function from geometry that only increases starting-stock size or machining effort.\n <\/span>\n <\/div>\n\n <\/div>\n\n\n
\n\n 03<\/b>\n\n
\n Rebuild the Process Route<\/strong>\n \n Retain turning and milling where they are needed while removing the separate deep-hole drilling operation from the revised route.\n <\/span>\n <\/div>\n\n <\/div>\n\n\n
\n\n 04<\/b>\n\n
\n Compare Total Production Cost<\/strong>\n \n Evaluate the combined effect of material, drilling, turning and milling rather than optimizing one operation in isolation.\n <\/span>\n <\/div>\n\n <\/div>\n\n <\/div>\n\n\n

\n This stainless steel shaft machining<\/strong> approach also reduced turning cost from US$43.75 to US$7.20 per shaft, while CNC milling remained unchanged at US$6.25. The result was not achieved by removing all machining. Instead, the revised route used machining more selectively and reduced the amount of work required to reach the finished geometry.\n <\/p>\n\n\n \"Production\n\n<\/section>\n\n\n

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MATERIAL CONSIDERATIONS<\/p>\n\n

Why Material Efficiency Matters When Machining SS316<\/h2>\n\n

\n SS316 belongs to the austenitic stainless-steel family and is selected in many engineered components because stainless steels can provide useful combinations of corrosion resistance, mechanical performance and manufacturability. From a machining perspective, however, material selection is only one part of the cost equation. The quantity of material purchased and the amount that must later be removed can have an equally important effect on the economics of production.\n <\/p>\n\n

\n For engineers working on stainless steel shaft machining<\/strong>, technical guidance from the\n \n Nickel Institute on machining austenitic chromium-nickel stainless steels\n <\/a>\n discusses machining characteristics and practical considerations for this material family. For buyers and engineers, this type of technical reference is useful when evaluating why rigid setups, suitable tooling and a well-planned machining strategy matter for stainless components.\n <\/p>\n\n

\n In this project, SPM did not change the specified SS316 material. The larger saving came from reducing how much of that material was required for each shaft and then simplifying the downstream route. That distinction is central to this stainless steel shaft machining<\/strong> case: the material requirement stayed aligned with the project, while the way the material was converted into the finished part changed significantly.\n <\/p>\n\n\n

\n Engineering principle:<\/strong>\n For repeat-production stainless components, material utilization and process routing should be reviewed together. A lower-cost machining strategy is often created before production reaches the machine.\n <\/div>\n\n<\/section>\n\n\n
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COST BREAKDOWN<\/p>\n\n

68.4% Unit Cost Reduction After Design Optimization<\/h2>\n\n

\n The commercial impact of the revised stainless steel shaft machining<\/strong> route becomes clear when the individual cost elements are compared. Before optimization, the total manufacturing cost was US$159.30 per part. After redesign and process review, the total fell to US$50.35. At 600 pieces per year, the annual production cost decreased from US$95,580 to US$30,210.\n <\/p>\n\n\n

\n\n US$65,370<\/strong>\n\n \n estimated annual saving at 600 pcs \/ year
\n 68.4% unit cost reduction\n <\/span>\n\n <\/div>\n\n\n
\n\n \n\n \n\n \n \n\n \n \n \n \n \n \n \n
Item<\/th>\n Before<\/th>\n After<\/th>\n Change<\/th>\n <\/tr>\n\n <\/thead>\n\n\n
Raw material weight<\/td>\n 22.56 kg<\/td>\n 7.8 kg<\/td>\n \u221265.4%<\/td>\n <\/tr>\n\n
Raw material cost<\/td>\n US$101.50<\/td>\n US$36.90<\/td>\n \u221263.6%<\/td>\n <\/tr>\n\n
Deep-hole drilling<\/td>\n US$7.80<\/td>\n \u2014<\/td>\n Eliminated<\/td>\n <\/tr>\n\n
CNC turning<\/td>\n US$43.75<\/td>\n US$7.20<\/td>\n \u221283.5%<\/td>\n <\/tr>\n\n
CNC milling<\/td>\n US$6.25<\/td>\n US$6.25<\/td>\n Unchanged<\/td>\n <\/tr>\n\n
Total per part<\/td>\n US$159.30<\/td>\n US$50.35<\/td>\n \u221268.4%<\/td>\n <\/tr>\n\n
Total 600 pcs \/ year<\/td>\n US$95,580<\/td>\n US$30,210<\/td>\n \u221268.4%<\/td>\n <\/tr>\n\n <\/tbody>\n\n <\/table>\n\n <\/div>\n\n\n

\n The largest absolute saving came from raw material, but the process changes reinforced that benefit. Deep-hole drilling was eliminated, turning cost was sharply reduced, and milling cost remained unchanged. This is why the final result should be viewed as a complete stainless steel shaft machining<\/strong> optimization rather than a single-operation cost reduction.\n <\/p>\n\n<\/section>\n\n\n

\n\n

WHEN THIS APPROACH MAKES SENSE<\/p>\n\n

Where Similar Cost-Reduction Opportunities Can Be Found<\/h2>\n\n

\n Not every shaft should be redesigned, and not every machining step should be removed. The value of DFM depends on the geometry, production quantity, required material and functional requirements of the individual component. For low-volume prototypes, a straightforward machining route may still be the most practical option because engineering and process-development effort must also be justified.\n <\/p>\n\n

\n Repeat-production stainless steel shaft machining<\/strong> projects are different. When the same component is manufactured month after month, excess stock, unnecessary turning or an avoidable secondary operation is repeated on every unit. Even a modest per-part saving can therefore become significant over a full production year. In this case, the volume of 50 pieces per month made the redesign commercially meaningful.\n <\/p>\n\n\n

\n\n
\n\n Review Opportunity<\/span>\n\n

Signs a Shaft May Be Over-Processed<\/h3>\n\n