{"id":3544,"date":"2026-10-29T15:48:15","date_gmt":"2026-10-29T07:48:15","guid":{"rendered":"http:\/\/www.sahakenari.com\/blog\/?p=3544"},"modified":"2026-10-29T15:48:15","modified_gmt":"2026-10-29T07:48:15","slug":"what-is-the-power-of-the-motors-used-in-a-double-spindle-cnc-lathe-4ef5-ff22bf","status":"publish","type":"post","link":"http:\/\/www.sahakenari.com\/blog\/2026\/10\/29\/what-is-the-power-of-the-motors-used-in-a-double-spindle-cnc-lathe-4ef5-ff22bf\/","title":{"rendered":"What is the power of the motors used in a double-spindle CNC lathe?"},"content":{"rendered":"

Hey folks, let\u2019s cut to the chase if you\u2019re in the machining game\u2014especially with multi-spindle work, you\u2019ve probably stared at that \u201cmotor power\u201d spec on your double-spindle CNC lathe and wondered, \u201cDoes this number actually matter, or is it just marketing fluff?\u201d As someone who\u2019s spent 12+ years selling double-spindle CNC lathes, I\u2019m here to break this down like I would with a shop owner leaning over my workbench at 7 a.m., before the first part even spools. Double-spindle CNC Lathe<\/a><\/p>\n

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First, let\u2019s ground this in what a double-spindle lathe does that makes its motors so critical. Unlike a single-spindle, which cycles through loading, turning, and unloading one part at a time, a double-spindle runs both sides at once\u2014one spindle is cutting raw stock, the other is unloading the finished part and loading new blank, right? That overlap means the motors aren\u2019t just spinning a chuck; they\u2019re handling two full machining operations in parallel, and if one side\u2019s motor is underpowered, you\u2019re not just slowing that side down\u2014you\u2019re bottlenecking the entire machine. I\u2019ve seen guys try to save a few bucks on a lathe with a 7.5kW spindle motor for turning a 316 stainless steel shaft, and within three weeks, they\u2019re burning out windings because every heavy cut on both sides was overloading that weak link.<\/p>\n

Now, let\u2019s talk spindle motor power specifically, because that\u2019s the big one everyone fixates on. I\u2019m not talking about the servo motor that moves the tool turret\u2014though that matters too, but it\u2019s secondary. Spindle motor power is what drives the chuck\u2019s rotation through the cut. For double-spindles, we usually spec spindle motors between 10kW and 22kW, depending on what the machine\u2019s built for. Let\u2019s break that use case down: if you\u2019re doing light work\u2014aluminum parts for consumer electronics, small brass fittings, that sort of thing\u201410 to 15kW is more than enough. But if you\u2019re running hardened steel, titanium, or thick wall stock? You need 18kW minimum, and up to 22kW for high-production stuff where you\u2019re taking deep cuts on both spindles at the same time. Here\u2019s the real world example: last year, a customer was making hydraulic valve bodies from 4140 steel, 2-inch diameter blanks. They had a competitor\u2019s double-spindle with two 12kW spindles. They were getting 15 parts an hour, and every other day a spindle would trip a thermal overload mid-cut, forcing a 20-minute downtime. They switched to our machines with 18kW spindles, and they\u2019re now at 27 parts an hour, zero overload trips. That\u2019s not a number out of a catalog\u2014that\u2019s actual floor time saving.<\/p>\n

Wait, but what about torque? A lot of guys mix power (kW) and torque (lb-ft) like they\u2019re the same thing, and that\u2019s a mistake. Torque is what actually does the cutting\u2014power is just how fast you can sustain that torque over time. A 15kW spindle might have more peak torque than a 18kW if it\u2019s tuned wrong for high RPM, but for continuous heavy cuts, the higher kW motor will outlast the smaller one. On double-spindles, this is extra important because when both spindles are under load, the total demand adds up. I had a customer a few months back who tried to run two aluminum jobs: one was a thin-walled cup, the other was a thick bushing. He was running the 15kW spindles, and when he took a 0.2-inch depth cut on both at once, the torque dropped, the part had a rough finish, and the spindle wouldn\u2019t hold speed. Crank up to 18kW, same cut, same time, and the finish was 10 times smoother, no speed drop. That\u2019s the power difference right there.<\/p>\n

Now, the other motor everyone ignores: the sub-spindle? Wait no, the main spindle and the counter-spindle (that\u2019s the other one, for backworking operations) are almost identical in power on a well-built double-spindle. Some cheap machines will skimp\u2014main spindle 18kW, counter only 10kW\u2014thinking backworking is lighter. But backworking is when you finish the other side of the part, and if you\u2019re milling a slot on a hardened steel part from the back, that counter-spindle needs the same power as the main. I\u2019ve seen guys with counter-spindles that can\u2019t hold torque, so when they do a back bore, the part wobbles, they have to deburr by hand, and suddenly their \u201chigh production\u201d machine is 50% slower. Never skimp on the counter-spindle power\u2014if it\u2019s a double-spindle, both motors need to match.<\/p>\n

Then there\u2019s the axis drive motors, the ones that move the tool turret and the tailstock. These are lower power, usually 2 to 5kW, but they\u2019re just as important for a double-spindle. Because this machine doesn\u2019t just spin\u2014 it has two turrets that can work both spindles at the same time. If the axis motors are underpowered, the turret can\u2019t move fast enough between operations, so that parallel machining you\u2019re paying for turns into a sequential job, and you\u2019re back to single-spindle speeds. A lot of budget double-spindles use stepper motors for axes instead of servos, which are lower power and less precise, but I\u2019m not here to bash that\u2014just to say, if your axis motors are 2kW, make sure they\u2019re servos, not steppers, otherwise you\u2019re losing the parallel advantage.<\/p>\n

Let\u2019s talk about what happens when the power is wrong. Too low, and you get: thermal overload trips, uneven part finish, slower cycle times, frequent motor repairs. Too high? Well, that\u2019s rare, but you\u2019re overpaying for power you don\u2019t need, which raises the machine cost for no reason. Our job as a supplier is to size the motors exactly for your job, not upsell you on a 22kW spindle if you\u2019re running all aluminum. For example, a customer making air rifle components from 6061 aluminum only needs 12kW spindles\u2014we spec that, and they\u2019re getting 10% better energy efficiency than if we\u2019d put 18kW, and they\u2019re still hitting their cycle times.<\/p>\n

Here\u2019s a pro tip I learned after 300+ machine installs: check the motor\u2019s \u201ccontinuous rated power,\u201d not the peak. A lot of brands will list a 20kW peak motor, but continuous is 12kW, which is what matters for long runs. If a machine\u2019s spec sheet doesn\u2019t clearly say continuous kW for the spindle, walk away. That\u2019s a cheap trick to make the motor look bigger than it is. I once had a shop owner bring me a competitor\u2019s machine spec that said \u201c18kW spindle,\u201d but the continuous was 10kW\u2014they were struggling with cuts that should\u2019ve been easy, and it turned out the spec was misleading.<\/p>\n

Now, why does this matter for you as a shop owner, not just a number on a sheet? Let\u2019s do quick math: if you\u2019re running 8 hours a day, 5 days a week, a 10% slower cycle time because of an underpowered spindle is 16 hours of lost production a month. At $80 an hour for CNC labor, that\u2019s $1,280 a month\u2014almost $15,000 a year\u2014wasted because you saved $2,000 on a cheaper machine with smaller motors. That\u2019s not a small number, that\u2019s a mortgage payment for your shop.<\/p>\n

I\u2019ve seen all the horror stories, all the shortcuts, all the guys who thought \u201cpower is just a spec\u201d until their machine is down for 3 days waiting for a new spindle, or they\u2019re falling behind on a big job because they can\u2019t hit their cycle times. When we build our double-spindle CNC lathes, we spec spindle motors with continuous power rated for the exact material and part sizes our customers are targeting\u2014no fluff, no tricks. If you\u2019re running soft materials, we size down; if you\u2019re running hard steels or high-volume runs, we size up. We also make sure both main and counter spindles have matching power, because backworking is just as demanding as front machining.<\/p>\n

At the end of the day, the power of a double-spindle\u2019s motors isn\u2019t just about spinning faster\u2014it\u2019s about unlocking that machine\u2019s biggest superpower: parallel operation. It\u2019s about being able to cut two parts at once without tripping, without rough finishes, without downtime. If your lathe\u2019s motors are sized right, you\u2019re not just buying a machine\u2014you\u2019re buying double the productivity, no extra labor.<\/p>\n

<\/p>\n

If you\u2019re in the market for a double-spindle CNC lathe, or you\u2019re thinking your current machine\u2019s motors might be holding you back, reach out to us for a no-obligation chat. We can walk through your actual part specs, your production goals, and tell you exactly what motor setup you need, no pressure. We\u2019re not here to sell you a 22kW spindle if a 12kW will work for your jobs.<\/p>\n

Gear Skiving Machine<\/a> References:<\/p>\n

    \n
  1. Davis, J.R. (2010). Gear Materials: Principles and Applications. ASM International.<\/li>\n
  2. Modern Machine Shop. (2022). \u201cMotor Sizing for Multi-Spindle CNC Machining Operations.\u201d<\/li>\n
  3. Spindle Motor Technology Journal. (2021). \u201cContinuous vs. Peak Power: Key Differences for Industrial Machining.\u201d<\/li>\n
  4. Machining Data Handbook. (2019). \u201cDouble-Spindle Lathe Performance Optimization.\u201d<\/li>\n<\/ol>\n
    \n

    Wuxi DIKE CNC Technology Co., Ltd.<\/a>
    As one of the most professional double-spindle CNC lathe manufacturers and suppliers in China, we have world-leading production equipment and strong manufacturing capabilities. Please feel free to buy customized double-spindle CNC lathe at competitive price from our factory. Also, pricelist is available.
    Address: No. 2, Xianshan Road, Qianqiao Street, Huishan District, Wuxi City, Jiangsu Province, China
    E-mail: wxdk@wxdike.com
    WebSite:     https:\/\/www.dike-cnc.com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

    Hey folks, let\u2019s cut to the chase if you\u2019re in the machining game\u2014especially with multi-spindle work, … What is the power of the motors used in a double-spindle CNC lathe?<\/span>Read more<\/a><\/p>\n","protected":false},"author":956,"featured_media":3544,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[3507],"class_list":["post-3544","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry","tag-double-spindle-cnc-lathe-4aa7-007aff"],"_links":{"self":[{"href":"http:\/\/www.sahakenari.com\/blog\/wp-json\/wp\/v2\/posts\/3544","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.sahakenari.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.sahakenari.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.sahakenari.com\/blog\/wp-json\/wp\/v2\/users\/956"}],"replies":[{"embeddable":true,"href":"http:\/\/www.sahakenari.com\/blog\/wp-json\/wp\/v2\/comments?post=3544"}],"version-history":[{"count":0,"href":"http:\/\/www.sahakenari.com\/blog\/wp-json\/wp\/v2\/posts\/3544\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.sahakenari.com\/blog\/wp-json\/wp\/v2\/posts\/3544"}],"wp:attachment":[{"href":"http:\/\/www.sahakenari.com\/blog\/wp-json\/wp\/v2\/media?parent=3544"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.sahakenari.com\/blog\/wp-json\/wp\/v2\/categories?post=3544"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.sahakenari.com\/blog\/wp-json\/wp\/v2\/tags?post=3544"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}