{"id":27014,"date":"2026-07-03T10:42:46","date_gmt":"2026-07-03T08:42:46","guid":{"rendered":"https:\/\/roder.it\/applications\/automation-and-industrial-process\/rpm-and-machine-rotational-speed-monitoring\/"},"modified":"2026-10-06T16:00:24","modified_gmt":"2026-10-06T14:00:24","slug":"rpm-and-machine-rotational-speed-monitoring","status":"publish","type":"page","link":"https:\/\/roder.it\/en\/applications\/automation-and-industrial-process\/rpm-and-machine-rotational-speed-monitoring\/","title":{"rendered":"RPM and machine rotational speed monitoring"},"content":{"rendered":"\n<div class=\"wp-block-group is-layout-constrained wp-container-core-group-is-layout-61d584a3 wp-block-group-is-layout-constrained\">\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-ba02fbf7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:40%\">\n<figure class=\"wp-block-image size-full has-custom-border\"><img loading=\"lazy\" decoding=\"async\" width=\"648\" height=\"648\" src=\"https:\/\/roder.it\/wp-content\/uploads\/2026\/07\/shimpo-stroboscopi_serie_st4000-immagine_prodotto_vista_frontale_stroboscopio-web_image-648x648-1.webp\" alt=\"Portable stroboscope for monitoring machine RPM\" class=\"wp-image-15177\" style=\"border-width:1px;border-top-left-radius:20px;border-top-right-radius:20px;border-bottom-left-radius:20px;border-bottom-right-radius:20px\" srcset=\"https:\/\/roder.it\/wp-content\/uploads\/2026\/07\/shimpo-stroboscopi_serie_st4000-immagine_prodotto_vista_frontale_stroboscopio-web_image-648x648-1.webp 648w, https:\/\/roder.it\/wp-content\/uploads\/2026\/07\/shimpo-stroboscopi_serie_st4000-immagine_prodotto_vista_frontale_stroboscopio-web_image-648x648-1-300x300.webp 300w, https:\/\/roder.it\/wp-content\/uploads\/2026\/07\/shimpo-stroboscopi_serie_st4000-immagine_prodotto_vista_frontale_stroboscopio-web_image-648x648-1-150x150.webp?crop=1 150w, https:\/\/roder.it\/wp-content\/uploads\/2026\/07\/shimpo-stroboscopi_serie_st4000-immagine_prodotto_vista_frontale_stroboscopio-web_image-648x648-1-600x600.webp?crop=1 600w, https:\/\/roder.it\/wp-content\/uploads\/2026\/07\/shimpo-stroboscopi_serie_st4000-immagine_prodotto_vista_frontale_stroboscopio-web_image-648x648-1-400x400.webp?crop=1 400w, https:\/\/roder.it\/wp-content\/uploads\/2026\/07\/shimpo-stroboscopi_serie_st4000-immagine_prodotto_vista_frontale_stroboscopio-web_image-648x648-1-200x200.webp?crop=1 200w, https:\/\/roder.it\/wp-content\/uploads\/2026\/07\/shimpo-stroboscopi_serie_st4000-immagine_prodotto_vista_frontale_stroboscopio-web_image-648x648-1-120x120.webp?crop=1 120w\" sizes=\"auto, (max-width: 648px) 100vw, 648px\" \/><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:60%\">\n<p class=\"has-text-color has-background wp-block-paragraph\" style=\"border-radius:0px 6px 6px 0px;border-left-color:var(--wp--preset--color--ti-accent);border-left-style:solid;border-left-width:5px;color:#1A5276;background-color:#ebf1f4;padding-top:14px;padding-right:16px;padding-bottom:14px;padding-left:16px;font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.769), 20px);font-style:italic\"><strong>Monitoring the RPM<\/strong> and rotational speed of machines with a stroboscope makes it possible to check the speed of rotating parts <strong>without contact<\/strong> and without stopping production, for process control and predictive maintenance.<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<ul class=\"wp-block-list is-style-checkbox has-ti-accent-color has-text-color has-link-color wp-elements-1\">\n<li><strong>Non-contact RPM measurement:<\/strong> no wear or slippage<\/li>\n\n\n\n<li><strong>No machine stoppage:<\/strong> checks during production<\/li>\n\n\n\n<li><strong>Wide frequency range:<\/strong> up to 120,000 FPM<\/li>\n\n\n\n<li><strong>Inspection at the same time:<\/strong> parts seen as &#8220;stationary&#8221;<\/li>\n\n\n\n<li><strong>Predictive maintenance:<\/strong> motors, shafts, fans<\/li>\n\n\n\n<li><strong>Sensor synchronisation:<\/strong> automatic reading<\/li>\n\n\n\n<li><strong>Portable or fixed:<\/strong> battery or mains<\/li>\n<\/ul>\n<\/div>\n<\/div>\n\n\n\n<div style=\"height:24px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">In <strong>automation and process control<\/strong>, knowing the actual rotational speed of motors, shafts, fans and impellers is essential for synchronising drives, checking deviations from nominal speed and scheduling maintenance. The <strong>stroboscope<\/strong> measures RPM optically and <strong>without contact<\/strong>, avoiding the wear and slippage of contact-wheel tachometers and without applying reflectors or interrupting machine operation. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Unlike a tachometer, the stroboscope also makes it possible to <strong>inspect<\/strong> the moving part, which appears stationary at the correct frequency: play, vibration, wear or defects can thus be identified while the machine is running. For the physical principle, see the in-depth article <a href=\"https:\/\/roder.it\/en\/technologies\/optics-and-laser\/optical-stroboscopy\/\">Optical stroboscopy<\/a>. <\/p>\n<\/div>\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<div class=\"wp-block-cover is-light popmake-11245\" style=\"border-width:1px;border-top-left-radius:10px;border-top-right-radius:10px;border-bottom-left-radius:10px;border-bottom-right-radius:10px;min-height:250px;aspect-ratio:unset;\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"213\" class=\"wp-block-cover__image-background wp-image-14896 size-large\" alt=\"banner aiuto nella scelta dello strumento oppure della tecnologia\" src=\"https:\/\/roder.it\/wp-content\/uploads\/2026\/06\/banner_technical_support_choose_products-1024x213.png\" data-object-fit=\"cover\" srcset=\"https:\/\/roder.it\/wp-content\/uploads\/2026\/06\/banner_technical_support_choose_products-1024x213.png 1024w, https:\/\/roder.it\/wp-content\/uploads\/2026\/06\/banner_technical_support_choose_products-300x63.png 300w, https:\/\/roder.it\/wp-content\/uploads\/2026\/06\/banner_technical_support_choose_products-768x160.png 768w, https:\/\/roder.it\/wp-content\/uploads\/2026\/06\/banner_technical_support_choose_products.png 1200w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><span aria-hidden=\"true\" class=\"wp-block-cover__background has-background-dim\" style=\"background-color:#d3d6dc\"><\/span><div class=\"wp-block-cover__inner-container is-layout-constrained wp-container-core-cover-is-layout-a304f9a9 wp-block-cover-is-layout-constrained\">\n<p class=\"has-text-align-right has-ti-fg-color has-text-color has-link-color wp-elements-2 wp-block-paragraph\" style=\"font-size:clamp(21.536px, 1.346rem + ((1vw - 3.2px) * 1.726), 35px);\"><strong>Would you like help choosing the right product ?<\/strong><\/p>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-right is-layout-flex wp-container-core-buttons-is-layout-b507c051 wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/roder.it\/en\/contacts\/\">Click here !<\/a><\/div>\n<\/div>\n<\/div><\/div>\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<h2 class=\"wp-block-heading has-ti-accent-color has-text-color\">Why monitor rotational speed<\/h2>\n\n<p class=\"wp-block-paragraph\">Rotational speed is a critical parameter in a great many processes: a drift from the nominal value may indicate overloads, transmission problems, loose belts or worn bearings. Periodic monitoring of <strong>RPM<\/strong> allows these anomalies to be identified early, reducing unplanned downtime and rejects. Stroboscopic measurement is particularly useful where it is not possible to access the shaft or apply a contact sensor.  <\/p>\n\n<h2 class=\"wp-block-heading has-ti-accent-color has-text-color\">Non-contact measurement with the stroboscope<\/h2>\n\n<p class=\"wp-block-paragraph\">The procedure is simple: the stroboscope is pointed at the rotating part and the flash frequency (in <strong>FPM<\/strong> or <strong>Hz<\/strong>) is adjusted until a single stationary image is obtained; the corresponding frequency is equal to the speed in revolutions per minute. The <strong>\u00d72 \/ \u00f72<\/strong> functions and fine tuning speed up the search and avoid the ambiguities of submultiples. With the <strong>external sensor input<\/strong>, some models automatically synchronise the flashes with the speed of the process, for continuous monitoring.  <\/p>\n\n<h2 class=\"wp-block-heading has-ti-accent-color has-text-color\">Advantages over other methods<\/h2>\n\n<ul class=\"wp-block-list is-style-checkbox has-ti-accent-color has-text-color has-link-color wp-elements-3\">\n<li><strong>No contact<\/strong>: no wear, no slippage, no marks on the surface<\/li>\n\n\n\n<li><strong>No stoppage<\/strong> of the machine: measurement under real operating conditions<\/li>\n\n\n\n<li><strong>Inspection at the same time<\/strong>: the part appears stationary and can be checked for defects and vibration<\/li>\n\n\n\n<li><strong>No reflector<\/strong> to apply, unlike reflective optical tachometers<\/li>\n\n\n\n<li><strong>Wide frequency range<\/strong>, suitable for both low and very high speeds<\/li>\n<\/ul>\n\n<h2 class=\"wp-block-heading has-ti-accent-color has-text-color\">How to choose the instrument<\/h2>\n\n<p class=\"wp-block-paragraph\">The choice depends on the speed range, the environment and the mode of use. <strong>LED<\/strong> models (<a href=\"https:\/\/roder.it\/strumenti\/stroboscopi-industriali\/stroboscopi-industriali-serie-st-4000-6\/\">ST-4000<\/a>, <a href=\"https:\/\/roder.it\/strumenti\/stroboscopi-industriali\/stroboscopi-industriali-serie-st-5000\/\">ST-5000\/ST-5100<\/a>, <a href=\"https:\/\/roder.it\/strumenti\/stroboscopi-industriali\/stroboscopi-industriali-serie-dt-366\/\">DT-366<\/a>) cover ranges up to 120,000 FPM with a long life; <strong>xenon<\/strong> models (<a href=\"https:\/\/roder.it\/strumenti\/stroboscopi-industriali\/stroboscopi-industriali-serie-dt-735\/\">DT-735<\/a>, <a href=\"https:\/\/roder.it\/strumenti\/stroboscopi-industriali\/stroboscopi-industriali-serie-dt-311d\/\">DT-311D<\/a>) offer a very short flash for detail. The <a href=\"https:\/\/roder.it\/strumenti\/stroboscopi-industriali\/stroboscopi-industriali-serie-st-5000\/\">ST-5000\/ST-5100<\/a> incorporates an automatic speed-detection laser that simplifies reading. The complete overview is on the page <a href=\"https:\/\/roder.it\/strumenti\/stroboscopi-industriali\/\">Stroboscopes for industrial applications<\/a>.   <\/p>\n\n<h2 class=\"wp-block-heading has-ti-accent-color has-text-color\">Predictive maintenance and reduced machine downtime<\/h2>\n\n<p class=\"wp-block-paragraph\">Periodic checking of rotational speed is a key component of <strong>predictive maintenance<\/strong>. By comparing the measured RPM with the nominal value, it is possible to identify deviations indicative of loose belts, worn bearings, overloads or transmission problems before they develop into failures. Intervening on a planned basis, rather than following a sudden stoppage, reduces maintenance costs, limits production rejects and extends the service life of components. Because stroboscopic measurement does not require the machine to be stopped, it can be repeated frequently during normal production cycles, building up a historical record of values that helps to highlight drift trends.   <\/p>\n\n<h2 class=\"wp-block-heading has-ti-accent-color has-text-color\">Typical sectors and use cases<\/h2>\n\n<p class=\"wp-block-paragraph\">RPM monitoring with a stroboscope is used in numerous sectors: in the <strong>printing and converting industry<\/strong> to check the speed of cylinders and rollers; in <strong>extrusion and moulding<\/strong> for checking screws and spindles; in <strong>textiles<\/strong> for spindles and bobbins; in <strong>automotive<\/strong> and <strong>general engineering<\/strong> for motors, fans and drive shafts. In all these cases the stroboscope allows both speed measurement and visual inspection of the moving part, identifying surface defects, play and vibration during operation. <\/p>\n\n<h2 class=\"wp-block-heading has-ti-accent-color has-text-color\">Stroboscope, tachometer or fixed sensor?<\/h2>\n\n<p class=\"wp-block-paragraph\">The <strong>stroboscope<\/strong> is the instrument of choice when speed must be measured without contact and the part inspected at the same time, or when it is not possible to access the end of the shaft. The <strong>tachometer<\/strong> (contact or reflective optical) is suitable for a quick, spot numerical reading of speed, while <strong>fixed speed sensors<\/strong> are used for permanent monitoring built into the machine. In many plants the three solutions are complementary; for measuring the speed and length of materials in line, see instead the optical velocimeters in the dedicated section.  <\/p>\n\n<h2 class=\"wp-block-heading has-ti-accent-color has-text-color\">Good practice for reliable measurement<\/h2>\n\n<p class=\"wp-block-paragraph\">To obtain a correct RPM reading, it is good practice to start from the highest frequency and reduce it gradually, so as to identify the <strong>first true stationary image<\/strong> and avoid submultiples (at half or one third of the frequency the object may appear equally stationary). It is advisable to choose an asymmetric reference on the rotating part \u2014 a notch, a screw, a key \u2014 in order to recognise the position unambiguously. It is also important to ensure adequate distance and illumination: the Shimpo models indicate illuminance values (lux) at typical distances, and the adjustable flash duration makes it possible to increase image sharpness. Finally, for continuous monitoring, the external sensor input allows the flashes to be synchronised automatically with the actual speed of the process.   <\/p>\n\n<h2 class=\"wp-block-heading has-ti-accent-color has-text-color\">Frequently asked questions<\/h2>\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-0\"><strong class=\"schema-faq-question\">How is RPM measured with a stroboscope?<\/strong> <p class=\"schema-faq-answer\">The flash frequency is adjusted until the rotating part appears stationary as a single image: the frequency in FPM corresponds to the speed in revolutions per minute. The \u00d72\/\u00f72 functions help to avoid submultiples. <\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-1\"><strong class=\"schema-faq-question\">Why use a stroboscope instead of a contact tachometer?<\/strong> <p class=\"schema-faq-answer\">Because it measures without contact, with no wear or slippage, requires no reflectors and allows the moving part, which appears stationary, to be inspected, identifying defects and vibration during operation.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-2\"><strong class=\"schema-faq-question\">Does the machine need to be stopped for the measurement?<\/strong> <p class=\"schema-faq-answer\">No: the measurement is made under real operating conditions, without stopping production.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-3\"><strong class=\"schema-faq-question\">Which stroboscope should be chosen for RPM monitoring?<\/strong> <p class=\"schema-faq-answer\">For very wide ranges and long life, the LED models (ST-4000, ST-5000\/ST-5100, DT-366); for maximum detail, the xenon models (DT-735, DT-311D). The ST-5000\/ST-5100 adds automatic speed detection. <\/p> <\/div><\/div>\n\n<h2 id=\"prodotti-collegati\" class=\"wp-block-heading has-ti-accent-color has-text-color\">Related products<\/h2>\n\n<p class=\"wp-block-paragraph\">The RODER instruments for this application. Go to the relevant catalogue pages for models, technical data and documentation. <\/p>\n\n<div class=\"wp-block-group is-layout-grid wp-container-core-group-is-layout-b251d530 wp-block-group-is-layout-grid\">\n<div class=\"wp-block-group has-border-color has-white-background-color has-background is-layout-constrained wp-container-core-group-is-layout-10ff9433 wp-block-group-is-layout-constrained\" style=\"border-color:#e0e0e0;border-width:1px;border-radius:8px;padding:16px\">\n<figure class=\"wp-block-image size-large has-custom-border\"><a href=\"https:\/\/roder.it\/en\/products\/stroboscopes-for-industrial-applications\/\"><img decoding=\"async\" src=\"https:\/\/roder.it\/wp-content\/uploads\/2019\/06\/prodotti_stroboscopi.png\" alt=\"Industrial stroboscopes\" style=\"border-radius:6px;aspect-ratio:4\/3;object-fit:contain\"\/><\/a><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.385), 17px);\"><a href=\"https:\/\/roder.it\/en\/products\/stroboscopes-for-industrial-applications\/\">Industrial stroboscopes<\/a><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:14px\">Xenon and LED stroboscopes for motion analysis and RPM measurement.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link has-custom-font-size wp-element-button\" href=\"https:\/\/roder.it\/en\/products\/stroboscopes-for-industrial-applications\/\" style=\"font-size:14px\">Browse the catalogue<\/a><\/div>\n<\/div>\n<\/div>\n<\/div>\n\n<div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\">\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h4 class=\"wp-block-heading has-ti-accent-color has-text-color has-link-color wp-elements-4\">Contacts &amp; Information<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Contact for general information : <a href=\"mailto:info@roder.it\">info@roder.it<\/a><br\/><br\/>Machine Vision Division of RODER : <a href=\"http:\/\/www.rodervision.com\">www.rodervision.com<\/a><br\/>RODER Instruments Division : <a href=\"http:\/\/www.rodervision.com\">www.innovacheck.com<\/a><br\/>More about RODER : <a href=\"https:\/\/roder.it\/en\/contacts\/\">about us<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The information contained in this website is provided for information purposes only. Although it has been prepared with the greatest care, it does not constitute a contractual offer or a binding commitment to supply. It may contain transcription, translation or typographical errors. For precise and up-to-date information, please contact our company directly.   <\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Note:<\/strong> Some images on this website have been intentionally generated using artificial intelligence (AI). This is because, for many applications and projects, photographs of the actual installation or system cannot be disclosed owing to confidentiality agreements, contractual clauses and non-disclosure agreements (NDAs). <\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Monitoring the RPM and rotational speed of machines with a stroboscope makes it possible to check the speed of rotating parts without contact and without stopping production, for process control and predictive maintenance. In automation and process control, knowing the actual rotational speed of motors, shafts, fans and impellers is essential for synchronising drives, checking [&hellip;]<\/p>\n","protected":false},"author":157040980,"featured_media":26467,"parent":19917,"menu_order":1,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_yoast_wpseo_focuskw":"","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"","_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","_wpcom_ai_launchpad_about_page":false,"_wpcom_ai_launchpad_gallery_page":false,"_wpcom_ai_launchpad_contact_page":false,"_wpcom_ai_launchpad_events_page":false,"_wpcom_ai_launchpad_video_page":false,"_wpcom_ai_launchpad_portfolio_piece":false,"footnotes":""},"class_list":["post-27014","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>RPM and machine rotational speed monitoring - RODER SRL<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/roder.it\/en\/applications\/automation-and-industrial-process\/rpm-and-machine-rotational-speed-monitoring\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"RPM and machine rotational speed monitoring - RODER SRL\" \/>\n<meta property=\"og:description\" content=\"Monitoring the RPM and rotational speed of machines with a stroboscope makes it possible to check the speed of rotating parts without contact and without stopping production, for process control and predictive maintenance. 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