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GARANT GMT35 vibratory finishing machine for perfect surfaces

Vibratory finishing has huge potential

Vibratory finishing, also known as barrel finishing, is used to finish the surface of metal and plastic workpieces.

The workpieces are placed in a trough together with grinding or polishing media (grinding bodies) and an additional agent (compound) in an aqueous solution. The oscillating movement (vibratory finishing) of the container creates a relative movement between the workpiece and the media. The abrasive media, so-called grinding bodies or chips, remove the material as required. Depending on the specific requirements, the removal rate can be set higher or lower by different process parameters.

To the GARANT GMT35

Your requirements

  • High level of flexibility for the finishing process
  • Small to medium batch sizes (1 – 500 pieces)
  • Work in up to three shifts and process several workpieces simultaneously
  • A mobile and flexible solution, without high investment costs
  • No need for major maintenance and inspections
  • In-house processing to retain expertise and transparency in all production steps

Your benefits

  • Numerous applications: Polishing, deburring, finishing 3D printed parts and much more
  • Top-quality results: Visible and measurable results
  • Proximity: Located directly next to the machine, allowing you to keep an eye on things at all times
  • No need to send products to external service providers: production and finishing at the same location
  • Time savings: Process and production times shortened
  • No need for manual processing: Shorter processing times

4 simple steps for you. A giant leap for your productivity

Our technical advisors make your entry into the world of vibratory finishing as easy as possible by providing detailed advice.
Through a test machining of your components at our premises, you can clearly assess the advantages of your planned investment and receive a guideline with which you can directly start machining your workpieces after purchasing the GARANT vibratory finishing machine GMT35.

1. Advice on site

Our specialist advisers would be happy to advise you on site, with no obligation. Here, all data is recorded and the feasibility of using our vibratory finishing solutions for your machining process with is checked. Points such as workpiece geometry, surface requirements or quantity to be produced annually are precisely analysed and recorded.

2. Feasibility check

With our customer sample part processing, we offer all customers interested in a GMT35 a service for test processing of individual components in advance. This gives you a clear picture of what you can expect from our products in the future before you buy.

3. Offer

You will receive a detailed offer containing all the products required for your future vibratory finishing process.

4. Commissioning

When the GMT35 vibratory finishing machine is delivered, our specialist consultants start up the machine together with you and give you detailed instructions on the machine.

The mobile vibratory finishing machine GARANT GMT35

1. Transport trolley

  • Quick and easy transport
  • Three storage boxes for abrasive media and workpieces

2. Separation station

  • Automatic separation of workpiece and abrasive media
  • Three sieves with different hole patterns
  • Easy change of abrasive media

3. Soundproofing

  • Machine cladding for soundproofing with noise-absorption hood
  • Inside of trough and funnel outlet lined with polyurethane
  • Noise level < 80 dB

4. Controls

  • Proteced against splashed water and vibrations
  • Intuitive operation via touch screen
  • Numerous setting options: processing time, speed, pump control, etc.
  • Individual processing steps can be programmed

5. Trough vibrator

  • Powerful motor
  • 35 litre steel trough, inside lined (15 mm polyurethane layer)
  • Trough can be divided using divider
  • Constant water supply of 45 l/min via two outlets

6. Mobility

  • Rollers on the underside for easy transport
  • Ony 230 V connection – no compressed air or permanent water line required
  • Saves space – machine with trolley measures (WxDxH) 2030 x 710 x 1380 mm

7. Integrated wastewater treatment

  • Large water tank (45 litres) for wet processing
  • Wastewater treatment with settling tank

Discover more details in the eShop

Everything from a single source

The right interaction between vibratory finishing machine, grinding bodies, compounds, personal protective equipment and cleaning equipment is a guarantee for optimum grinding results.

1. The GARANT Vibratory finishing machine GMT35 is the quick entry into automated post-processing.

GARANT
Vibratory finishing machine (35 litres) with trolley GMT35
£16,206.30
plus VAT at the current rate

2. Optimally matched grinding bodies and compounds guarantee a smooth process.

3. The right PPE and cleaning devices guarantee maximum protection. Ultrasonic cleaning afterwards.

The GARANT vibratory finishing machine GMT35 not only impresses with its high performance and mobility, but also with its sophisticated functionalities and appealing design. The jury of the German Design Award saw it the same way, as they awarded the machine as "Winner" in the category "Industry".

Vibratory finishing has huge potential

Vibratory finishing, also known as barrel finishing, is used to finish the surface of metal and plastic workpieces.

The workpieces are placed in a trough together with grinding or polishing media (grinding bodies) and an additional agent (compound) in an aqueous solution. The oscillating movement (vibratory finishing) of the container creates a relative movement between the workpiece and the media. The abrasive media, so-called grinding bodies or chips, remove the material as required. Depending on the specific requirements, the removal rate can be set higher or lower by different process parameters.

To the GARANT GMT35

A simple solution for any requirement

Requirement: Deburring

Example: Holders made of S355 steel, laser-cut edges and machined holes, deburred on all sides. No high demands on the final surface condition. Quantity: 80 pieces

1st process step: Deburring

The ceramic grinding bodies in a triangular shape with straight edges were selected for this step. This shape is characterised by its robustness and long tool life. It is often used to process simple, flat workpieces with pronounced edges.

  • Abrasive media: 501510 1010T
  • Ceramic grinding bodies: coarse
  • Shape: triangle, dimensions: 10 × 10 mm
  • Compound: 501650 UNI, universal for steel and stainless steel, for grinding and polishing with corrosion protection
  • Processing time: 30 min
  • Water: on
  • Speed: 3000 rpm

Requirement: Deburring and polishing

Example: Turned parts made from steel 42CrMo4, with bores in the shell, deburring on all sides. Surface glossy in final condition. Quantity: 10 pieces

1st process step: Deburring

The ceramic grinding bodies in the oblique cylinder shape were selected for this step. The round shape is ideal for processing bores and round workpieces. The oblique ends also enable the stepped edges on the upper side of the workpiece to be easily reached.

  • Abrasive media: 501530 1020CA
  • Ceramic grinding bodies: coarse
  • Shape: cylinder oblique, dimensions: 10 × 20 mm
  • Compound: 501650 UNI , universal for steel and stainless steel, for grinding and polishing with corrosion protection
  • Processing time: 40 min
  • Water: on
  • Speed: 3000 rpm

2nd process step: Polishing

For the polishing process, the best choice are the porcelain grinding bodies. These smooth the surfaces and achieve an excellent surface finish.

  • Abrasive media: 501590 0406CA
  • Porcelain grinding bodies: polishing
  • Shape: cylinder oblique
  • Dimensions: 4 × 6 mm
  • Compound: 501650 UNI , universal for steel and stainless steel, for grinding and polishing with corrosion protection
  • Processing time: 40 min
  • Water: on
  • Speed: 3000 rpm

Requirement: Post-processing of additively manufactured workpieces

Example 1: Hollow sphere with lattice structure made from tool steel 1.2709, made using 3D printing additive manufacturing (SLM). Requirement: Completely grind the rough surface (build-up of layers) and polish to a glossy final condition. The underside, which was connected to the support structure, was roughly pre-ground. Quantity: 50 pieces

1st process step: Grinding

  • Abrasive medium: 501530 1530CA
  • Ceramic grinding bodies: coarse
  • Shape: cylinder (oblique)
  • Dimensions: 15 × 30 mm
  • Compound: 501650 UNI
  • Processing time: 4 hours
  • Water: on
  • Speed: 3000 rpm

2nd process step: Polishing

  • Abrasive medium: 501590 0406CA
  • Porcelain grinding bodies: polishing
  • Shape: cylinder (oblique)
  • Dimensions: 4 × 6 mm
  • Compound: 501650 UNI
  • Processing time: 2 hours
  • Water: on speed: 3000 rpm

Example 2: Flat plates made from polymer resin, made using 3D printing additive manufacturing (MJP). Requirement: Smooth out the 3D-printed structure and achieve a slightly glossy finish as the final condition. Quantity: 100 pieces

1st process step: Grinding

  • Abrasive medium: 501561 1010K
  • Plastic grinding bodies: coarse
  • Shape: taper
  • Dimensions: 10 × 10 mm
  • Compound: 501650 UNI
  • Processing time: 2 hours
  • Water: on Speed: 3000 rpm

2nd process step: Polishing

  • Abrasive medium: 501590 0406CA
  • Porcelain grinding bodies: polishing
  • Shape: cylinder (oblique)
  • Dimensions: 4 × 6 mm
  • Compound: 501650 UNI
  • Processing time: 1 hour
  • Water: on Speed: 3000 rpm

Practical knowledge of vibratory finishing: tips and suggested solutions

  • Selecting the process media

    1st work step: Deburring and grinding2nd work step: Polishing
    MaterialGrinding bodiesCompoundGrinding bodiesCompound
    SoftAluminium

    Plastic grinding bodies*
    (501561 – 501575)
    501660 ALUMINIUM






    Porcelain grinding bodies
    501660 ALUMINIUM
    Zinc
    Copper
    501665 COPPER
    501665 COPPER
    Brass
    Plastic501650 UNI or
    501670 PLASTIC
    501657 CLEAN    		501650 UNI or
    501670 PLASTIC
    (for high-gloss surfaces)
    HardSteel

    Ceramic grinding bodies
    (501510 – 501535)



    501650 UNI
    501657 CLEAN



    501650 UNI     or
    501655 SHINY
    (for high-gloss surfaces)
    Cast iron
    Stainless steel
    Titanium
    *Small ceramic grinding bodies are also suitable. Large ceramic grinding bodies can damage the surface when processing “soft” materials.

  • Selecting the shape and size of the grinding bodies

    Grinding bodiesCeramic, porcelain grinding bodiesPlastic grinding bodies
    MaterialLargeSmallTriangular (straight)Triangular (oblique)Cylinder (oblique)TaperPyramid
    Delicate workpiece
    Large / coarse workpiece
    Corners ≤ 90°
    Focus on edge processing
    Focus on surface processing (level, free-form surface)
    Holes, recesses, pockets

    General notes:

    • Large grinding bodies have a more aggressive abrasive effect than small grinding bodies and will provide the highest possible removal rate in the shortest space of time.
    • Try out the workpiece with the grinding bodies beforehand and check the critical points (holes, pockets, slots) to ensure they can be reached and nothing gets stuck.
    • Recommendation: Test run with one workpiece before starting a large batch.
    • The longer the grinding bodies are used for, the smaller they become and the edges are rounded off. This can reduce the abrasive effect.
    • Dry grinding is recommended if small components get stuck on the trough wall.

  • Tips for controlling the speed

    • Start at maximum speed (3,000 rpm). Check whether the workpieces and grinding bodies are moving in a circular motion in the trough. If not, reduce the speed.
    • When polishing, a lower speed tends to produce better surface quality results (but does mean the processing willtake longer).
    • When deburring, the tendency is to set a higher speed – greater abrasive effect.
    • If workpieces are damaged due to collisions, reduce the speed.

  • Tips to ensure the correct volume ratio

    • Strict requirements for the surface >> reduce the proportion of workpieces.
    • Low requirements on the surface >> increase the proportion of workpieces.
    • Prevent collisions when working with large workpieces >> use the divider.

  • Insufficient abrasive / deburring effect

    Solution

    • Has the correct abrasive medium been selected? Ceramic, plastic, porcelain grinding bodies.
    • Are the abrasive media heavily worn down or rounded?
    • Has a suitable compound (treatment agent) been used?
    • Has the recommended mixing ratio (concentration) of water and compound been complied with?
    • Use larger grinding bodies (critical locations on the workpiece must still be reachable).
    • Increase the speed.
    • Increase the processing time.
    • Check whether the water is contaminated.
    • The grinding bodies will move less in deep pockets and blind bores, meaning the abrasive effect will belower. As a possible remedy, use smaller grinding bodies.

  • Excessive abrasive effect

    • Reduce the processing time.
    • Reduce the speed.
    • Has the correct abrasive medium been selected? Ceramic, plastic, porcelain grinding bodies.
    • Choose medium instead of coarse grinding bodies.
    • Use smaller grinding bodies. Note the risk of jamming in holes.

  • Workpieces are dirty after processing

    • Change the water mixture.
    • Is the concentration of the compound in the water mixture too low?
    • Are the parts too heavily contaminated to begin with?

  • Workpieces damaged due to collisions

    • Reduce the number of workpieces processed at a time.
    • Use the divider to separate the workpieces.
    • Reduce the speed.

  • Grinding bodies get stuck in holes, break-throughs, slots

    • Choose grinding bodies of a different size.
    • Choose grinding bodies of a different shape.
    • Grinding bodies are worn down (too small); replace with new grinding bodies.
    • Cover or fill the problem zones/recesses.

  • Burr is not removed

    Burrs greater than 0.3 mm (base width) can no longer be removed cost-effectively. Check/optimise theprocess parameters/tool wear in the previous production step.

  • Machine is too loud

    Correctly close all covers, especially the trough cover. If the vibrations on the trough cover haveincreased significantly, replace the rubber pad on the clamping lever.

  • Cleaning the water tank is too time-consuming

    Alternatively, the entire water tank can be vacuumed using a wet and dry vacuum cleaner e.g. No. 078541 751-11.

Gentle cleaning without residues through ultrasound

After vibratory finishing, do you have very high requirements when it comes to cleaning and drying the components?

In this case, cleaning with ultrasonic cleaning equipment and suitable cleaning agents is recommended. The injection of ultrasound into the liquids creates a pulsating flow with a multitude of tiny bubbles of gas, which “implode” on striking a solid body. The energy thereby released “blasts” the dirt off the parts to be cleaned. Since the cleaning fluid also penetrates into holes and undercuts, ultrasound reliably cleans even complex geometries. In contrast to mechanical cleaning or cleaning with high-pressure jets, ultrasound is gentle to the surface of the components.

Discover our range of ultrasonic cleaning equipment and accessories here

Brochure GMT35

For more information about the vibratory finishing machine check our concise online brocure.

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