DF Series

DF “WET” SERIES
Drag finishing machine for mass finishing and polishing of knee and hip joints, burr shafts, watch cases, dies, pistons and decorative workpieces.

STANDARD EQUIPMENT

• Process drum coated with PU to reduce wear
• High-quality sealed cladding in steel
• Flow-optimized process container
• Vertical spindle with ball screw drive for 90% on-time
• Display and selection of vertical workpiece position
• Infinitely variable drag finishing speed via frequency inverter
• Storage capacity for up to 200 process configurations
• Generous clearance between container rim and holder makes it easier to fit workpieces to holders
• Bearings for workpiece holders of up to 15 kg
• Process data can be backed up onto external MMC card

DF-3/4 HD SERIES
Drag-finishing machine for workpieces

STANDARD EQUIPMENT

• Process container with a capacity of 88 l
• High-quality, sealed cladding in steel, exterior of panels and base painted
• Flow-optimized process container
• Vertical spindle with ball screw drive
• Vertical workpiece position display and pre-selection
• Storage capacity for 200 process configurations
• Greater clearance between container rim and holder makes it easier to fit workpieces to holders
• 3 or 4 clamping devices for the workpieces holders S
• Stronger bearings for holding weights of up to 15 kg
• Process data can be backed up onto external MMC card
• Additional drive unit for independent holder rotation and higher speeds
• Automatic door for fast changeover of workpieces

DF-5/6 HD SERIES
Drag finishing machine for workpieces.

STANDARD EQUIPMENT

• Process container with a capacity of 114 l
• High-quality, sealed cladding in steel, exterior of panels and base painted
• Flow-optimized process container
• Vertical spindle with ball screw drive
• Vertical workpiece position display and pre-selection
• Storage capacity for 200 process configurations
• Greater clearance between container rim and holder makes it easier to fit workpieces to holders
• 5 or 6 clamping devices for the workpieces holders
• Stronger bearings for holding weights of up to 15 kg
• Process data can be backed up onto external MMC card
• Additional drive unit for independent holder rotation and higher speeds
• Automatic door for fast changeover of workpieces

DF-5/330 WET SERIES
Drag finishing machine for large and heavy workpieces. With its space-saving receptive workpiece holders and greater power, the DF-5/330 wet is one of our largest and most powerful DF machines..

STANDARD EQUIPMENT

• Process container with a capacity of 250 l
• For holder diameters of up to 330 mm and holder weights of up to 20 kg
• Maximum workpiece length 280 mm
• Sturdy, welded steel chassis
• High-quality, sealed cladding in steel
• Flow-optimized process container
• Vertical workpiece position display and pre-selection
• Storage capacity for 200 process configurations
• Greater clearance between container rim and holder makes it easier to fit workpieces to holders
• 5 clamping devices for the workpieces holders
• Process data can be backed up onto external MMC card
• Additional drive unit for independent holder rotation and higher speeds

The two-stage DF-3 S2 drag finishing machine from OTEC is a genuine innovation. For the first time ever, this machine makes it possible to grind and polish workpieces such as implants and watch cases whilst they are gripped in a holder. The advanced technology used achieves a finish equivalent to that obtrained by hand polishing but in an absolutely reliable process.

OTEC has been developing drag finishing machines ever since the company was founded in 1996. In this mass finishing process, the workpieces are clamped in holders and dragged trhough a grinding or polishing medium. To make the process even more effective, the workpiece also rotates on its own axis and at the same time describes a planetary motion.

In order to obtain maximum efficients, it is often necessary to process the workpieces in two stages. For example, the workpieces are processed by wet grinding in the first stage and then polished in dry process in the second stage. This enables Ra values of up to 0.01 µm to be achieved. Until now, this process required the use of two machines, e.g. on machine for wet grinding and another one for dry polishing, and this in turn meant repeatedly clamping and unclamping the workpieces.

The new DF-3 S2 solves this problem. The machine has two process containers which can be combned as required for wet/dry or dry/dry operation. The various process parameters such as finishing time, speed, etc. can be set by means of a Siemens touch screen panel. The machine then runs through all the individual processing stages, removing the need for time-consuming unclamping and reclamping of the workpieces.

HOLDER

Independently driven tool holders
With this type of holder specially developed for finishing tools, each workpiece rotates indivually on its own axis in addition to the general rotation. This produces a uniform surface finsh in even shorter processing times. It also achieves excellent smoothing of the flutes of cutting tools.

Angled holder
especially suitable for finishing end faces and forging dies

Quick tool changer
This system enables tools such as drills and burs to be changed in seconds by means of a lever.

TROLLEY

Trolley for DF Tools
Trolley with castors for quick container change

MISCELLANEOUS

Immersion depth control
For controlling the depth to which the workpieces are immersed in the granualte. Two photoelectric barriers are used to identify the tip of the workpieces when they are immersed in the medium. From this, the control system then calculates the maximum possible immersion depth. The immersion depth of the workpieces in the process container is displayed for any defined level of medium. The immersion depth of the workpieces  can be preselected for best results.

Changing tray for attachments
Storage and changing tray for attachments (available in various sizes). Makes it easier to fit chucks and workpieces.

Hood
Hood for connecting an extraction unit

Water cooling
to reduce the temperature of the granulate