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Workpiece clamping technology for lathes

Here you will find everything you need for rotary workpiece clamping technology for lathes. With high-performance jaw chucks, clamping elements, centre points and more, you can fully exploit the performance of your machining.

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    Mandrel adaptation MANDO Adapt T212 | size XXS | adaption size 65 | variant SE | length 128 mm | suitable for TOPlus mini pull-back / combi pull-back / modular, TOROK, HYDROK, MANOK plus

    Logo Hainbuch GmbH Marbach Workholding Technology

    Change-over from O.D. clamping to perfect I.D. clamping, without changing the clamping device? No problem with MANDO Adapt. Place the mandrel in the mounted clamping device, tighten three screws and lock the mandrel in the clamping device. In this process the mandrel engages in the coupling of the clamping device via a sophisticated mechanism, where otherwise the clamping head engages. MANDO Adapt is attractive with extreme rigidity and precision. For rotating products, run-out of 0.005 mm between chuck taper and mandrel taper can be achieved. For stationary clamping devices repeatability of 0.003 mm is possible. And best of all, this can accomplished without adjusting.

    • Extremely fast conversion without detachment of the basic clamping device[1 – 2 min.]
    • Large clamping range and vibration dampening due to vulcanized clamping elements
    • Standard segmented clamping bushings and work-piece end-stops for machining to size available

    Mandrel-in-clamping-device,
    without draw bolt / pull-back

    • Workpiece stabilization through axial draw force applied againstthe workpiece end-stop
    • Clamping without draw bolt, consequently ideal for blind bores
  • Image

    Geared scroll chuck ZS, size 200, KK 5, 3 jaws, ISO 702-1 (DIN 55026), DIN 55021, ASA B 5.9, A1/A2 metr., mounting from front inner bolt circle, with inside and outside jaw, steel body

    Logo Roehm GmbH Sontheim driven by technology

    Geared scroll chuck ZS, size 200, KK 5, 3 jaws, ISO 702-1 (DIN 55026), DIN 55021, ASA B 5.9, A1/A2 metr., mounting from front inner bolt circle, with inside and outside jaw, steel body

    Geared scroll chucks in steel design.

    3-jaw and 4-jaw version.

    Features

    • With one-piece jaws or with base and top jaws
    • Steel body and spiral ring die-forged
    • Series-balanced and hardened
    • ZS = centric clamping, steel
    • ZSU = centric clamping, steel, reversible top jaws

    Advantages

    • Special flat design for minimum interfering contours
    • The jaws can be adjusted over the entire clamping range by turning the key. This allows workpieces with different clamping diameters to be quickly clamped
    • Jaws in chuck ground out for concentricity

    Field of application

    • Proven geared scroll chuck for use in areas requiring high clamping forces, high concentricity as well as reliable long-term repeatability.
    • For universal use on lathes, rotary tables, dividing units, etc.

    Notes

    • ISO 702-1 (DIN 55026), DIN 55021, ASA B 5.9, A1/A2 metr.; mounting from front

  • Image

    Mandrel adaptation MANDO Adapt T212 | size XS | adaption size 65 | variant SE | length 128 mm | suitable for TOPlus mini pull-back / combi pull-back / modular, TOROK, HYDROK, MANOK plus

    Logo Hainbuch GmbH Marbach Workholding Technology

    Change-over from O.D. clamping to perfect I.D. clamping, without changing the clamping device? No problem with MANDO Adapt. Place the mandrel in the mounted clamping device, tighten three screws and lock the mandrel in the clamping device. In this process the mandrel engages in the coupling of the clamping device via a sophisticated mechanism, where otherwise the clamping head engages. MANDO Adapt is attractive with extreme rigidity and precision. For rotating products, run-out of 0.005 mm between chuck taper and mandrel taper can be achieved. For stationary clamping devices repeatability of 0.003 mm is possible. And best of all, this can accomplished without adjusting.

    • Extremely fast conversion without detachment of the basic clamping device[1 – 2 min.]
    • Large clamping range and vibration dampening due to vulcanized clamping elements
    • Standard segmented clamping bushings and work-piece end-stops for machining to size available

    Mandrel-in-clamping-device,
    without draw bolt / pull-back

    • Workpiece stabilization through axial draw force applied againstthe workpiece end-stop
    • Clamping without draw bolt, consequently ideal for blind bores
  • Image

    DURO-A, 3-jaw, serration 90°, external pass 380 |max. chuck diameter Ø400

    Logo Roehm GmbH Sontheim driven by technology
    • Spindle aperture:   133.000  mm
    • Clamping principle:   Backen 
    • Interface coding, machine sided:   AP380 
  • Image

    Mandrel adaptation MANDO Adapt T212 | size S | adaption size 65 | variant SE | length 130 mm | suitable for TOPlus mini pull-back / combi pull-back / modular, TOROK, HYDROK, MANOK plus

    Logo Hainbuch GmbH Marbach Workholding Technology

    Change-over from O.D. clamping to perfect I.D. clamping, without changing the clamping device? No problem with MANDO Adapt. Place the mandrel in the mounted clamping device, tighten three screws and lock the mandrel in the clamping device. In this process the mandrel engages in the coupling of the clamping device via a sophisticated mechanism, where otherwise the clamping head engages. MANDO Adapt is attractive with extreme rigidity and precision. For rotating products, run-out of 0.005 mm between chuck taper and mandrel taper can be achieved. For stationary clamping devices repeatability of 0.003 mm is possible. And best of all, this can accomplished without adjusting.

    • Extremely fast conversion without detachment of the basic clamping device[1 – 2 min.]
    • Large clamping range and vibration dampening due to vulcanized clamping elements
    • Standard segmented clamping bushings and work-piece end-stops for machining to size available

    Mandrel-in-clamping-device,
    without draw bolt / pull-back

    • Workpiece stabilization through axial draw force applied againstthe workpiece end-stop
    • Clamping without draw bolt, consequently ideal for blind bores
  • Image

    DURO-A, 3-jaw, serration 90°, external pass 300 |max. chuck diameter Ø315

    Logo Roehm GmbH Sontheim driven by technology
    • Spindle aperture:   98.500  mm
    • Clamping principle:   Backen 
    • Interface coding, machine sided:   AP300 
  • Image

    Mandrel adaptation MANDO Adapt T212 | size 0 | adaption size 65 | variant SE | length 141 mm | suitable for TOPlus mini pull-back / combi pull-back / modular, TOROK, HYDROK, MANOK plus

    Logo Hainbuch GmbH Marbach Workholding Technology

    Change-over from O.D. clamping to perfect I.D. clamping, without changing the clamping device? No problem with MANDO Adapt. Place the mandrel in the mounted clamping device, tighten three screws and lock the mandrel in the clamping device. In this process the mandrel engages in the coupling of the clamping device via a sophisticated mechanism, where otherwise the clamping head engages. MANDO Adapt is attractive with extreme rigidity and precision. For rotating products, run-out of 0.005 mm between chuck taper and mandrel taper can be achieved. For stationary clamping devices repeatability of 0.003 mm is possible. And best of all, this can accomplished without adjusting.

    • Extremely fast conversion without detachment of the basic clamping device[1 – 2 min.]
    • Large clamping range and vibration dampening due to vulcanized clamping elements
    • Standard segmented clamping bushings and work-piece end-stops for machining to size available

    Mandrel-in-clamping-device,
    without draw bolt / pull-back

    • Workpiece stabilization through axial draw force applied againstthe workpiece end-stop
    • Clamping without draw bolt, consequently ideal for blind bores
  • Image

    DURO-A, 3-jaw, serration 90°, external pass 220 |max. chuck diameter Ø254

    Logo Roehm GmbH Sontheim driven by technology
    • Spindle aperture:   79.000  mm
    • Clamping principle:   Backen 
    • Interface coding, machine sided:   AP220 
  • Image

    Mandrel adaptation MANDO Adapt T212 | size 1 | adaption size 65 | variant SE | length 147,5 mm | suitable for TOPlus mini pull-back / combi pull-back / modular, TOROK, HYDROK, MANOK plus

    Logo Hainbuch GmbH Marbach Workholding Technology

    Change-over from O.D. clamping to perfect I.D. clamping, without changing the clamping device? No problem with MANDO Adapt. Place the mandrel in the mounted clamping device, tighten three screws and lock the mandrel in the clamping device. In this process the mandrel engages in the coupling of the clamping device via a sophisticated mechanism, where otherwise the clamping head engages. MANDO Adapt is attractive with extreme rigidity and precision. For rotating products, run-out of 0.005 mm between chuck taper and mandrel taper can be achieved. For stationary clamping devices repeatability of 0.003 mm is possible. And best of all, this can accomplished without adjusting.

    • Extremely fast conversion without detachment of the basic clamping device[1 – 2 min.]
    • Large clamping range and vibration dampening due to vulcanized clamping elements
    • Standard segmented clamping bushings and work-piece end-stops for machining to size available

    Mandrel-in-clamping-device,
    without draw bolt / pull-back

    • Workpiece stabilization through axial draw force applied againstthe workpiece end-stop
    • Clamping without draw bolt, consequently ideal for blind bores
  • Image

    DURO-A, 3-jaw, serration 90°, external pass 220 |max. chuck diameter Ø315

    Logo Roehm GmbH Sontheim driven by technology
    • Spindle aperture:   98.500  mm
    • Clamping principle:   Backen 
    • Interface coding, machine sided:   AP220 
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Basic knowledge about workpiece clamping technology for lathes

Since the workpiece itself rotates on lathes, the clamping element used must also rotate. So-called chuck parts are held in lathe chucks that enable the workpiece to be clamped centrally on the inside and outside diameter. In most cases, the chucks are equipped with three clamping jaws - depending on the geometry and wall thickness of the part, also with four, six or more clamping jaws.

The workpiece holders are divided into manually operated manual chucks and power chucks, for example hydraulically operated. Power chucks provide excellent clamping force even at higher speeds: By converting the pulling force of the cylinder into a movement of the wedge bars, the centrifugal force is compensated. In comparison, chucks work in the lower clamping range, but create more powerful clamping - even with thin-walled workpieces. Here, several clamping jaws clamp the workpiece axially. Additional clamping in the radial direction provides more stability.

Segment mandrels also adopt this principle. Compared to lathe chucks, segment mandrels, which clamp with expanded segment bushings, convince with more precise and uniform clamping force results. As with collets, a small clamping range is also evident here.

Both lathe and collet chucks centre and clamp on the circumference. Because of this, it is not possible to machine the workpieces over the entire length in a single clamping. If work is to be done without reclamping, face drivers can be used. In this case, the force is transmitted to the face. For long turning diameters, steady rests, also known as steady rests, provide more stability for the workpiece and reduce vibrations.

Quality factors of clamping devices for lathes

High-quality clamping devices play a decisive role in CNC machining. The higher the turning force during turning, the higher the productivity and better the surfaces. Even at high speeds, which result in stronger centrifugal forces, clamping devices must have a constant holding force.

In overview, the quality of clamping devices is shown by the following factors:

  • Kraft und Stabilität
  • Flexible, vielseitige und einfach Handhabung
  • Präzision im Hinblick auf die Wuchtgüte des Spannfutters, die Wiederholgenauigkeit des Spannkopfs, die Rundlaufgenauigkeit von Spannfutter und Spanndorn und eine möglichst minimale Deformation empfindlicher oder dünnwandiger Werkstücke durch große Kontaktflächen von Spannkopf und Spannbüchse
  • Unempfindlich im Hinblick auf Fliehkräfte

For the optimal use of clamping devices such as jaw chucks, chucks or clamping mandrels, there are a few things to consider. Use the following questions to determine which chuck or other clamping element is suitable for the lathe and the workpiece in question.

  • Is the workpiece clamped in such a way that complete machining can take place without reclamping?
  • Is the changeover time as short as possible?
  • Can a result be reproduced without loss of quality?
  • Can the clamping force be flexibly adapted to the material?

Clamping system maintenance

To ensure the longest possible quality of your clamping device, regular maintenance is indispensable. If you keep to the lubrication intervals when maintaining your clamping system, you are on the safe side. Make sure that all surfaces are lubricated evenly. This will prevent the occurrence of an imbalance. Even after a base jaw change, the gearing should be cleaned and regreased.

Furthermore, a general regular maintenance is advisable. This minimises long-term wear and keeps the accuracy and clamping force of the clamping element high. In addition, damage to the chuck can be detected at an early stage before major problems arise and the lathe breaks down.