{"id":11751,"date":"2026-06-12T17:57:25","date_gmt":"2026-06-12T09:57:25","guid":{"rendered":"https:\/\/www.cncmachiningshops.com\/?p=11751"},"modified":"2026-07-15T22:11:56","modified_gmt":"2026-07-15T14:11:56","slug":"what-is-machinability","status":"publish","type":"post","link":"https:\/\/www.cncmachiningshops.com\/pt\/what-is-machinability\/","title":{"rendered":"O que \u00e9 Usinabilidade e Por Que Ela Importa na Usinagem CNC?"},"content":{"rendered":"<div data-page-id=\"J82dd8T6zoBK1Nx3sUacQngGn1K\" data-lark-html-role=\"root\" data-docx-has-block-data=\"true\">\n<blockquote><p><strong>Quick Answer:<\/strong> Machinability is a measure of how easily and efficiently a material can be cut, drilled, milled, or turned during machining. In CNC machining, a material&#8217;s machinability rating reflects four interdependent performance factors: the cutting force required to remove material, the rate at which cutting tools wear, the surface finish quality achievable without secondary operations, and the consistency of chip formation and evacuation. Machinability directly determines cycle time, tooling cost, and dimensional stability in production. Aluminum 6061 machines approximately 3\u20135\u00d7 faster than stainless steel 304 for the same operation; titanium Ti-6Al-4V requires cutting speeds 50\u201380% lower than aluminum and reduces tool life significantly. For parts where multiple materials can meet the performance requirements, choosing the material with better machinability reduces total manufacturing cost \u2014 often by 2\u20134\u00d7 for the same geometry and tolerance.<\/p><\/blockquote>\n<hr \/>\n<h2>What Machinability Means in Practice<\/h2>\n<p>Machinability is not a single measurable property like hardness or tensile strength. It is an engineering descriptor that summarizes a material&#8217;s overall behavior during the cutting process \u2014 how it responds to cutting forces, generates and dissipates heat, forms and evacuates chips, and allows the cutting tool to maintain a stable engagement.<\/p>\n<p><strong>Cutting force and power consumption:<\/strong> Materials with high specific cutting force (the force required per unit chip cross-section) demand more machine power and generate more stress on the cutting tool and workpiece fixture. Titanium Ti-6Al-4V has a specific cutting force of approximately 1,700\u20132,200 N\/mm\u00b2 in turning; aluminum 6061 is approximately 700\u2013900 N\/mm\u00b2 \u2014 roughly 2.5\u00d7 lower. This difference directly translates to machine spindle load, tool deflection, and workpiece holding requirements.<\/p>\n<p><strong>Thermal conductivity and heat management at the tool edge:<\/strong> Heat generated at the cutting zone must be conducted away from the tool-workpiece interface. Aluminum&#8217;s thermal conductivity of approximately 167 W\/m\u00b7K allows heat to dissipate quickly into the chip and workpiece. Titanium&#8217;s thermal conductivity of approximately 7 W\/m\u00b7K means the cutting zone heats rapidly, concentrating temperature at the tool tip and accelerating tool edge wear and chemical diffusion between the tool and workpiece. Inconel 718 has thermal conductivity of approximately 12 W\/m\u00b7K, combined with high strength at cutting temperatures, making it one of the most thermally challenging production materials.<\/p>\n<p><strong>Chip formation and control:<\/strong> Materials that produce short, well-defined chips (brass, free-machining aluminum alloys, free-machining steels with sulfur additions) allow chips to clear the cutting zone efficiently, preventing re-cutting and enabling high feed rates. Materials that produce long, stringy chips (austenitic stainless steels, some aluminum alloys) or that deform plastically rather than shearing cleanly (some copper alloys, soft annealed steels) require more conservative cutting parameters, frequent tool engagement interruptions, and higher-pressure coolant to manage chip evacuation.<\/p>\n<p><strong>Work hardening during cutting:<\/strong> Some materials harden at the cut surface during machining due to plastic deformation. Austenitic stainless steels (grades 304 and 316 in particular) work-harden rapidly; if the cutting tool dwells, rubs, or takes a cut that is too shallow to get below the work-hardened layer from the previous pass, tool wear accelerates dramatically. Work hardening is the primary reason that 304 stainless steel requires continuous steady feeding \u2014 stopping a feed mid-cut or taking excessively light finishing passes produces a harder surface that degrades the cutting edge.<\/p>\n<hr \/>\n<h2>Why Machinability Matters: The Cost and Quality Consequences<\/h2>\n<p>The machinability of the material selected for a part determines more of the total manufacturing cost than the raw material price in many cases \u2014 particularly for precision machined components where machine time, tooling, and inspection are the primary cost drivers.<\/p>\n<p><strong>Cycle time:<\/strong> Cutting speed is constrained by tool life and surface integrity requirements. For a lathe operation on a 50 mm diameter shaft, the allowable cutting speed for aluminum 6061 is approximately 300\u2013600 m\/min with carbide tooling; for titanium Ti-6Al-4V, the recommended cutting speed is approximately 30\u201380 m\/min with TiAlN-coated carbide. The cycle time difference for equivalent material removal is a factor of approximately 5\u201310\u00d7.<\/p>\n<p><strong>Tool consumption:<\/strong> Tool cost per part is the product of tool cost and the number of tool changes required. In aluminum machining, a single carbide insert might last 60\u2013120 minutes of cutting time before requiring replacement. In Inconel 718 rough turning, the same class of insert may last 5\u201315 minutes. At equivalent machine rates and batch sizes, tooling cost per part in Inconel can be 10\u201320\u00d7 higher than in aluminum \u2014 a cost difference that persists regardless of improvements in machine capability.<\/p>\n<p><strong>Dimensional consistency and inspection cost:<\/strong> Materials with poor machinability produce more dimensional variation within a production batch \u2014 from tool wear progressing faster, from thermal expansion caused by heat retention at the cutting zone, and from surface work hardening that changes the effective cutting conditions partway through a production run. Tighter inspection intervals are required; parts may need in-process gauging to catch dimensional drift before tolerance limits are exceeded.<\/p>\n<p><strong>Secondary operations required:<\/strong> For materials where the achievable surface finish directly from machining is insufficient for function (sealing surfaces, sliding fits), surface quality is a direct cost driver. Good machinability materials (aluminum, brass, free-machining steels) produce Ra 0.8\u20131.6 \u00b5m from finish turning without secondary operations. Difficult materials may require additional grinding or polishing passes to achieve equivalent surface quality.<\/p>\n<hr \/>\n<h2>Machinability of Common Engineering Materials<\/h2>\n<p>The following table reflects typical production experience with standard CNC tooling (carbide inserts, standard coated end mills) under recommended cutting parameters.<\/p>\n<table>\n<thead>\n<tr>\n<th>Material<\/th>\n<th>Machinability<\/th>\n<th>Typical Turning Speed (m\/min)<\/th>\n<th>Tool Life Relative<\/th>\n<th>Primary Challenge<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Brass C360 (free-machining)<\/td>\n<td>Excellent<\/td>\n<td>200\u2013400<\/td>\n<td>High<\/td>\n<td>None significant<\/td>\n<\/tr>\n<tr>\n<td>Aluminum 2011 (free-machining)<\/td>\n<td>Excellent<\/td>\n<td>300\u2013600<\/td>\n<td>High<\/td>\n<td>None significant<\/td>\n<\/tr>\n<tr>\n<td>Aluminum 6061-T6<\/td>\n<td>Very good<\/td>\n<td>250\u2013500<\/td>\n<td>High<\/td>\n<td>Chip packing in deep pockets<\/td>\n<\/tr>\n<tr>\n<td>Aluminum 7075-T6<\/td>\n<td>Good<\/td>\n<td>200\u2013450<\/td>\n<td>High\u2013medium<\/td>\n<td>Slightly higher cutting force than 6061<\/td>\n<\/tr>\n<tr>\n<td>Mild steel (1018)<\/td>\n<td>Good<\/td>\n<td>100\u2013200<\/td>\n<td>Medium<\/td>\n<td>Moderate tool wear<\/td>\n<\/tr>\n<tr>\n<td>303 stainless steel (free-machining)<\/td>\n<td>Moderate\u2013good<\/td>\n<td>80\u2013150<\/td>\n<td>Medium<\/td>\n<td>Sulfur inclusions improve chip breaking<\/td>\n<\/tr>\n<tr>\n<td>4140 alloy steel<\/td>\n<td>Moderate<\/td>\n<td>80\u2013150<\/td>\n<td>Medium<\/td>\n<td>Higher cutting force than mild steel<\/td>\n<\/tr>\n<tr>\n<td>304 stainless steel<\/td>\n<td>Moderate<\/td>\n<td>60\u2013120<\/td>\n<td>Medium\u2013low<\/td>\n<td>Work hardening; stringy chips<\/td>\n<\/tr>\n<tr>\n<td>316 stainless steel<\/td>\n<td>Moderate<\/td>\n<td>50\u2013100<\/td>\n<td>Medium\u2013low<\/td>\n<td>More work hardening than 304<\/td>\n<\/tr>\n<tr>\n<td>Titanium Ti-6Al-4V<\/td>\n<td>Poor<\/td>\n<td>30\u201380<\/td>\n<td>Low<\/td>\n<td>Low thermal conductivity; rapid tool wear<\/td>\n<\/tr>\n<tr>\n<td>Inconel 718<\/td>\n<td>Very poor<\/td>\n<td>20\u201350<\/td>\n<td>Very low<\/td>\n<td>Work hardening; heat retention; chemical tool wear<\/td>\n<\/tr>\n<tr>\n<td>Tungsten carbide<\/td>\n<td>Extremely poor<\/td>\n<td>EDM or grinding only<\/td>\n<td>N\/A<\/td>\n<td>Cannot be conventionally machined when sintered<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>Free-machining variants:<\/strong> Material suppliers offer free-machining grades of many standard alloys with improved machinability through controlled additions. 303 stainless steel contains sulfur additions (approximately 0.15\u20130.35% S) that form manganese sulfide inclusions \u2014 these act as chip breakers, improving chip form and surface finish significantly compared to 304 while maintaining similar corrosion resistance (though with reduced pitting resistance). Free-machining steels (12L14, 1215) contain lead or bismuth additions for the same purpose. Aluminum 2011 contains copper and bismuth for improved chip breaking versus 6061.<\/p>\n<p><strong>The hardness misconception:<\/strong> Hardness does not reliably predict machinability. Titanium Ti-6Al-4V has a Brinell hardness of approximately 320\u2013380 HB \u2014 comparable to or softer than many through-hardened alloy steels. Yet titanium is dramatically harder to machine than those steels, because its machinability limitation is thermal (low conductivity trapping heat at the tool) and chemical (titanium&#8217;s reactivity with cobalt binder in carbide tools at elevated temperature), not mechanical hardness. Similarly, 304 stainless steel at approximately 150 HB is not particularly hard, but its work-hardening behavior and stringy chip formation make it substantially harder to machine than 1018 mild steel at approximately 130 HB.<\/p>\n<hr \/>\n<h2>Machinability Rating Systems<\/h2>\n<p>Machinability ratings quantify a material&#8217;s machining behavior relative to a reference baseline.<\/p>\n<p><strong>AISI\/SAE 100% reference standard:<\/strong> The most widely used reference in the United States is AISI\/SAE B1112 free-machining steel, which is assigned a machinability rating of 100%. Other materials are rated relative to this standard under defined cutting conditions (specific tool material, cutting speed, tool geometry, and measurement of tool life or surface finish). A material rated at 300% can be machined at 3\u00d7 the rate of B1112 steel with equivalent tool life; a material rated at 20% requires cutting speeds approximately 1\/5 those of B1112.<\/p>\n<p><strong>Representative machinability ratings:<\/strong><\/p>\n<table>\n<thead>\n<tr>\n<th>Material<\/th>\n<th>Machinability Rating (AISI B1112 = 100%)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Brass C360<\/td>\n<td>300\u2013400%<\/td>\n<\/tr>\n<tr>\n<td>Aluminum 2011<\/td>\n<td>200\u2013300%<\/td>\n<\/tr>\n<tr>\n<td>Aluminum 6061<\/td>\n<td>150\u2013200%<\/td>\n<\/tr>\n<tr>\n<td>1018 mild steel<\/td>\n<td>70\u201380%<\/td>\n<\/tr>\n<tr>\n<td>303 stainless steel<\/td>\n<td>50\u201370%<\/td>\n<\/tr>\n<tr>\n<td>304 stainless steel<\/td>\n<td>40\u201355%<\/td>\n<\/tr>\n<tr>\n<td>4140 alloy steel (annealed)<\/td>\n<td>60\u201370%<\/td>\n<\/tr>\n<tr>\n<td>Titanium Ti-6Al-4V<\/td>\n<td>15\u201325%<\/td>\n<\/tr>\n<tr>\n<td>Inconel 718<\/td>\n<td>8\u201315%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>These ratings are practical approximations \u2014 actual machinability varies with cutting tool grade, coating, geometry, machine rigidity, coolant application, and specific alloy heat, so they should be treated as a relative ranking guide rather than absolute multipliers for cycle time estimation.<\/p>\n<hr \/>\n<h2>Balancing Machinability Against Material Performance<\/h2>\n<p>The engineering decision between machinability and material performance is a trade-off that must be made explicitly for each application. Neither maximum machinability nor maximum performance is automatically the correct choice.<\/p>\n<p><strong>When machinability should drive material selection:<\/strong> For prototyping and low-volume development, where fast iteration is more valuable than optimized material performance; for parts where multiple materials meet the mechanical requirements and cost is the primary differentiator; for high-volume production where even modest improvements in cycle time or tool life produce significant total cost reductions across the production run.<\/p>\n<p><strong>When performance must override machinability:<\/strong> For aerospace and defense structural applications where the weight-to-strength ratio of titanium or the high-temperature capability of Inconel is non-negotiable; for corrosion-critical applications where 316 stainless or duplex stainless is specified by the operating environment, not as a preference; and for medical implant applications where biocompatibility requirements (titanium ASTM F136, PEEK) constrain material options regardless of machinability.<\/p>\n<p><strong>The 7075 vs 6061 case as a practical example:<\/strong> Aluminum 7075-T6 has tensile strength of approximately 500\u2013570 MPa versus 310 MPa for 6061-T6 \u2014 an approximately 80% higher strength. Machinability of 7075 is slightly lower than 6061 due to higher zinc content increasing cutting force modestly, but both are highly machinable compared to steels or titanium. For a robotic structural bracket where 6061 has insufficient strength but the operating environment does not justify titanium, 7075 provides the performance improvement with minimal machinability penalty \u2014 a well-engineered trade-off. Substituting titanium Ti-6Al-4V in the same application would provide further strength and weight advantages, but at 5\u201310\u00d7 higher machining cost, which may not be justified by the application&#8217;s performance margin.<\/p>\n<hr \/>\n<h2>How to Apply Machinability in Material Selection<\/h2>\n<p><strong>Step 1 \u2014 Define performance floor, not maximum:<\/strong> Identify the minimum mechanical, thermal, and chemical resistance properties required for the part&#8217;s function. Do not over-specify. A robotic arm joint that requires 350 MPa tensile strength should be evaluated against materials that exceed 350 MPa \u2014 not exclusively against the highest-strength material available.<\/p>\n<p><strong>Step 2 \u2014 Screen materials against machinability:<\/strong> From the candidate materials meeting the performance floor, identify which are significantly easier to machine. The machinability rating table and material-specific cutting data from Sandvik, Kennametal, or IMC provide relative comparison.<\/p>\n<p><strong>Step 3 \u2014 Estimate total manufacturing cost, not material cost:<\/strong> Obtain cutting time estimates based on material machinability and the part&#8217;s machining operations. Add tooling cost at the appropriate tool life for each material. For large production volumes, the cost difference between a 150% and a 50% machinability material may exceed the raw material cost difference by a substantial margin.<\/p>\n<p><strong>Step 4 \u2014 Select on total lifecycle cost, not unit material price:<\/strong> Raw material cost for steel is lower than aluminum per kilogram, but aluminum typically costs less per machined part for equivalent geometry due to faster cycle times, lower tool wear, and simpler chip management.<\/p>\n<hr \/>\n<h2>Key Takeaways<\/h2>\n<ul>\n<li><strong>Machinability is a multi-factor performance indicator, not a single property<\/strong>: it reflects cutting force, thermal management, chip control, tool wear rate, and surface finish achievability \u2014 all in combination. Hardness alone does not predict machinability.<\/li>\n<li><strong>Titanium&#8217;s machinability challenge is thermal and chemical, not hardness<\/strong>: at 30\u201380 m\/min cutting speed versus 250\u2013500 m\/min for aluminum, titanium machining requires 5\u201310\u00d7 more machine time for equivalent material removal \u2014 primarily due to low thermal conductivity (7 W\/m\u00b7K vs aluminum 167 W\/m\u00b7K) trapping heat at the tool tip.<\/li>\n<li><strong>304 stainless steel&#8217;s machinability challenge is work hardening, not hardness<\/strong>: at approximately 150 HB, 304 is not hard, but its rapid work hardening at the cut surface requires continuous, consistent cutting to avoid the machinist&#8217;s trap of rubbing over a hardened layer \u2014 which accelerates tool wear and produces dimensional variation.<\/li>\n<li><strong>Free-machining grades improve machinability through controlled inclusions<\/strong>: 303 stainless vs 304, 12L14 vs 1018, and aluminum 2011 vs 6061 all demonstrate that material composition adjustments for chip-breaking improve machinability with minimal impact on functional mechanical properties.<\/li>\n<li><strong>Machinability rating (AISI B1112 = 100%) provides a practical relative scale<\/strong>: aluminum 6061 at 150\u2013200%, 303 stainless at 50\u201370%, titanium Ti-6Al-4V at 15\u201325%, and Inconel 718 at 8\u201315% quantify the production rate differences engineers should expect when selecting between these materials.<\/li>\n<li><strong>Total part cost, not raw material price, is the correct economic basis for material selection<\/strong>: a part machined from 304 stainless may have lower raw material cost than the same part in aluminum, but the machining cost difference typically more than offsets the material saving at any significant production volume.<\/li>\n<li><strong>For OEM procurement and design teams<\/strong>: when reviewing material specifications on engineering drawings, identify whether the specified material is the result of genuine performance requirements or conservative over-specification. A drawing that specifies titanium for a bracket with 350 MPa tensile strength requirement (where 7075 aluminum would suffice) represents a significant avoidable cost. Conversely, a drawing that specifies aluminum for a component in a 300\u00b0C environment represents a genuine performance non-conformance. Machinability evaluation is most valuable when it reveals that multiple materials can meet the functional requirement and guides the selection toward the most manufacturable option.<\/li>\n<\/ul>\n<hr \/>\n<h2>Frequently Asked Questions<\/h2>\n<h3>What is machinability and how is it measured?<\/h3>\n<p>Machinability is a practical measure of how easily, efficiently, and accurately a material can be machined \u2014 encompassing cutting force, tool wear rate, chip formation quality, surface finish achievability, and thermal behavior during cutting. It is typically quantified relative to a reference standard: in the AISI system, B1112 free-machining steel is assigned 100%, and other materials are rated proportionally based on achievable cutting speed at equivalent tool life under standardized conditions. Aluminum 6061 rates approximately 150\u2013200% (1.5\u20132\u00d7 the cutting rate of the reference); titanium Ti-6Al-4V rates approximately 15\u201325% (1\/4 to 1\/6 the cutting rate). The rating is a practical relative guide rather than a precise multiplier, because actual machinability varies with tooling, machine rigidity, coolant, and specific alloy composition.<\/p>\n<h3>Why is aluminum more machinable than stainless steel?<\/h3>\n<p>Aluminum&#8217;s machinability advantage over stainless steel has three primary causes. First, aluminum&#8217;s thermal conductivity (~167 W\/m\u00b7K) is approximately 10\u00d7 higher than austenitic stainless steel (~16 W\/m\u00b7K), allowing cutting heat to dissipate efficiently into the chip and workpiece rather than concentrating at the tool edge. Second, aluminum&#8217;s lower yield strength (~270\u2013500 MPa depending on grade) requires substantially less cutting force than stainless steel (~210\u2013500 MPa, but with much higher work-hardening coefficient). Third, aluminum produces well-defined chips that evacuate cleanly, while austenitic stainless steel produces long stringy chips that wrap around the tool and require higher-pressure coolant or chip breaker inserts to manage.<\/p>\n<h3>Why is titanium so difficult to machine despite not being extremely hard?<\/h3>\n<p>Titanium Ti-6Al-4V&#8217;s machinability challenge is primarily thermal and chemical rather than hardness-based. Its Brinell hardness of 320\u2013380 HB is similar to or lower than many hardened alloy steels that machine acceptably. The problem is thermal conductivity: at approximately 7 W\/m\u00b7K, titanium&#8217;s conductivity is approximately 4% of aluminum&#8217;s, meaning cutting heat cannot escape through the chip or workpiece and concentrates at the tool tip. This temperature elevation causes diffusion of cobalt binder from carbide tools into the titanium at elevated temperature (chemical tool wear), accelerates flank wear, and reduces cutting edge integrity. The practical consequence is that titanium requires cutting speeds of 30\u201380 m\/min \u2014 5\u201310\u00d7 lower than aluminum \u2014 and produces tool wear rates 5\u201310\u00d7 higher for equivalent material removal.<\/p>\n<h3>Does heat treatment affect machinability?<\/h3>\n<p>Yes, significantly. Heat treatment changes a material&#8217;s hardness, microstructure, and internal stress state, all of which affect machinability. Steel machined in the annealed condition (typically HRC 15\u201325) requires substantially less cutting force and produces better surface finish than the same steel after through-hardening (HRC 55\u201365). The standard practice for precision mold and die components is to machine in the annealed state, heat treat to final hardness, and then finish-machine only critical surfaces \u2014 or use EDM for features that cannot be re-machined in the hardened state. For aerospace titanium components, the heat treatment condition (annealed vs solution-treated and aged) has moderate effect on machinability; Ti-6Al-4V in the annealed condition machines slightly easier than in the fully aged condition.<\/p>\n<h3>How should material machinability affect the decision between two candidate materials?<\/h3>\n<p>The process should follow this sequence: first, confirm both materials meet the minimum performance requirements (tensile strength, temperature resistance, corrosion requirements, fatigue life). Second, compare their machinability ratings \u2014 if one material rates 50% and the other rates 150%, the lower-machinability material will require approximately 3\u00d7 more cutting time and generate substantially higher tool wear costs at equivalent production volume. Third, estimate the total manufactured part cost for each material, including raw material, machining time, tooling, and inspection \u2014 not just raw material price. If the total cost difference exceeds any performance benefit of the lower-machinability material, the higher-machinability option should be selected. This analysis is most impactful at production volumes where the cycle time and tooling cost differences accumulate across many parts.<\/p>\n<hr \/>\n<p><em>Written by the CMS engineering team with 15+ years of CNC machining experience processing aluminum alloys, stainless steels, titanium, Inconel, tool steels, and engineering plastics for medical device, aerospace, automotive, industrial automation, and precision instrument OEM manufacturing programs. Technical references: Machining Data Handbook (Metcut Research Associates), Sandvik Coromant Materials and Machinability Application Guide, Kennametal Engineering Guide to Cutting Tool Technology, Kalpakjian S. and Schmid S.R. \u2014 Manufacturing Engineering and Technology (Machinability chapter), ASM Handbook Vol. 16 (Machinability of Engineering Materials).<\/em><\/p>\n<hr \/>\n<p><strong>Selecting Materials for CNC Machined Components?<\/strong><\/p>\n<p>At CMS, we provide material selection guidance at the quoting stage \u2014 comparing machinability, cost, and performance trade-offs across candidate materials for your specific geometry and production volume.<\/p>\n<p>[Request a material selection review and CNC machining quote \u2192]<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>What is machinability: cutting force, tool wear, chip control &#038; thermal behavior \u2014 machinability ratings for aluminum, stainless, titanium &#038; Inconel with cost guide.<\/p>","protected":false},"author":1,"featured_media":11867,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[104],"tags":[],"class_list":["post-11751","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-general-basics"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.5 (Yoast SEO v28.7) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>What Is Machinability? 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