Technology 02

Cutting conditions search
Machining Navi

Our Machining Navi is an optional function that uses the OSP-P control and sensors to monitor chatter. When chatter is detected, the function then either recommends spindle speed changes (Machining Navi L-g and Machining Navi M-g) or automatically makes the spindle speed adjustments (Machining Navi M-i). By choosing the optimal speed(s) that allow your machine to avoid chatter, you can save operator time and maximize productivity.

Maximizing machine tool performance

Cost reduction—shorter cycle times and higher productivity—is required to compete in today’s global market. Machining Navi, with clear visuals of complex cutting conditions, is a breakthrough tool that enables the machine operator to navigate the machine and tool capabilities to their best performance levels.

Condiții optime așchiere - comparație fără și cu Machining Navi

Tailored approaches for different types of machine tool

Optimizing spindle speed

Especially suitable for high-speed milling applications, to effectively suppress chatter by shifting rpm’s to an optimum, and even faster chatter-free zone.

(Machining Navi, M-i, M-g, M-g +)

Raising the low-speed threshold— [milling and turning applications]

Increasing milling or turning spindle speeds in the slow zone requires a different approach to suppress chatter. Okuma’s solution provides a wider stable region for faster cutting in the low-speed zone.

(Machining Navi, M-i, M-g+, L-g)

Find the best cutting condition for your application

Four types of Machining Navi easily guide customers

  • Simple, auto-mode—leave it to the machine Finding optimum cutting conditions quickly

Machining Navi M-i (intelligently optimized spindle speed control)

Chatter vibration is measured by built-in sensors, and spindle speed is automatically changed to the optimum speed. In addition, advanced graphics of the optimal cutting conditions represent effective alternatives to suppress various chatter characteristics throughout the low to high speed zones.

  • Adjust cutting conditions while monitoring the data

Machining Navi M-gII (guided optimization of spindle speed)

Machining Navi M-gII+ (guided optimization of spindle speed/harmonic control)

Machining Navi M-g displays suggestions for the best spindle speed from chatter noise picked up by the microphone. The effect can be quickly checked by selecting one of the suggested spindle speeds with a single touch.
M-g +, which is available for machines with built-in spindles, controls chatter by changing the spindle speed during machining at low speeds.

  • Chatter-free applications for lathes

Machining Navi L-g (guided, harmonic spindle speed control)

Chatter in a lathe can be suppressed by changing spindle speeds to the ideal amplitude and wave cycle.

  • Threading chatter can be easily controlled by anyone

Machining Navi T-g (threading)

In the threading cycle, chatter during threading is controlled through appropriate change of the spindle speed in each pass.

Machining Navi M-i

Cutting condition search function for milling (intelligently optimized spindle speed control)

Simple, auto-mode—leave it to the machine

Chatter vibration is measured by built-in sensors, and Machining Navi automatically changes spindle speed to the optimum speed. In other words, vibration measurement, optimum spindle speed calculations and spindle speed adjustments are then made automatically.

Condiții optime așchiere - suprafață prelucrare fără și cu Machining Navi

Three easy steps

Machining Navi-i functions very simply. Just three steps are required to get the best cutting conditions.

Machining Navi - mod automat
Condiții optime așchiere - vizualizare parametrii vibrații

Changes made during “learning mode” are stored automatically

Machining Navi-i will automatically use the selected optimum spindle speed. Under similar conditions, the same original S command will be replaced by the “learned” spindle speed.

Condiții optime așchiere - Machining Navi mod de învățare

Finding the best cutting conditions quickly

Condiții optime așchiere - Machining Navi

Advanced graphics of the optimal cutting conditions represent effective alternatives to suppress various chatter characteristics throughout the low to high speed zones. In addition to Auto Control, this can be used as a tool to raise cutting conditions even further.

Machining Navi - simboluri ale stării de prelucrare

Effective measures are displayed

Sensors built in to the machine detect and analyze machining chatter. Machining Navi then navigates to the effective measures in a wide range of spindle speeds, from low to high.

Machining Navi M-gII

Cutting condition search function for milling

Adjust cutting conditions while monitoring the data

Based on the chatter noise captured by the microphone, Machining Navi displays a number of optimal spindle speed possibilities on the screen. The operator can change to the indicated spindle speed with a single touch and immediately confirm the result.

Microfon atașat magnetic pe panoul de comandă OSP
Preluare vibrații via microfon ți determinarea vitezei optime de prelucrare

Machining Navi M-gII+

Cutting condition search function for milling (guided optimization of spindle speed/harmonic control)

Această metodă este eficientă la vibrații joase, și este implementată în frezare pe centrele de prelucrare tip dublă coloană, respectiv în alezare la mașinile cu arbore principal integrat.

Machining Navi L-g

Cutting condition search function for turning (guided, harmonic spindle speed control)

Chatter in a lathe can be suppressed by changing spindle speeds to the ideal amplitude and wave cycle—without decreasing spindle speed.

Condiții optime așchiere - strunjire cu Machining Navi
Setare simplă strunguri cu funcție Machining Navi

Chatter control effect is seen as harmonic amplitude increases and harmonic period becomes shorter. When chatter remains with the recommended values, or when further improvement in machined surface quality is desired, harmonic amplitude and harmonic period can be adjusted by simply pressing the arrow key while watching the machining noise and size of spindle load displayed in a graph.

Monitorizare date Condiții optime așchiere

Machining Navi T-g

Cutting condition search in threading

Threading productivity is improved while costs are kept down

When chatter occurs in threading, general methods to resolve the problem have been to either lower cutting conditions at the expense of productivity, or to use special chatter-resistant tools at some cost. Machining Navi T-g (threading) provides optimum control, increasing or decreasing spindle speed on each pass to inhibit the periodic vibrations that are a cause of chatter.

Filetare fără și cu Machining Navi T-g dedicată
Example of Machining Navi T-g (threading)

Threading chatter can be quickly and easily controlled by anyone

With Machining Navi T-g (threading), a change to the best cutting conditions is made in 3 simple steps. Current and recommended threading conditions are shown on a visual graphics screen for navigation to chatterless threading.

Setare Machining Navi T-g strunguri
Monitorizare filetare și recomandări viteze arbore principal

Threading conditions visualized and optimized

Current and optimum cutting conditions, the spindle speed change (%) per threading pass, the current/total pass count, and other required information are all tabulated.

Optimum cutting conditions from touch screen operation

The only operation required is to press the RECOMND VALUE button. The recommended spindle speed (SS %) is automatically calculated from the base speed.
By pressing the ADJUST ON/OFF button, automatic spindle speed change starts. Simply touch input the new (chatterless) cutting conditions to revise the part program.

No threading phase error

Threading phase error occurs if the spindle speed is changed during threading, but there is no error with Machining Navi T-g; another benefit of synchronized spindle speed technology from Okuma — Your Single Source for Machine & Control.

OKUMA Intelligent Technology

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