Description
The Dedra DED7767 is the machine the whole finishing-pad range in this collection hangs off — a 710 W plaster float that takes a working disc on hook-and-loop and changes job with the disc fitted to it.
What the DED7767 Floats, Strips and Levels
The Dedra DED7767 render smoothing machine turns a 390 mm disc at 110 rpm on a 710 W motor, floating lime-cement and gypsum plaster and taking old layers and unevenness off walls, ceilings and floors on UK sites. It is the anchor of the Renders World power float and finishing sponge range, and the manual is explicit that what the tool does at any moment is decided by the disc on the head.
That is the whole design idea, and it is worth reading literally when planning a purchase. The manufacturer scope is plasterwork and surface removal, so the machine belongs to the preparation and base stages rather than to decorative topcoats.
- Floating and smoothing lime-gypsum plaster, and with sponge discs of differing hardness, floating and levelling lime-cement and gypsum plaster both internally and externally.
- Removing unevenness from existing plaster, stripping wallpaper, clearing mortar squeeze-out from between bricks, and taking dried plaster off concrete floors.
- Renovation, repair-shop and DIY work, which the manual permits provided the stated working conditions are kept to.
Decorative thin-coat topcoats are not on that list. Where the finish is a silicone render, the texture is set by hand with a plastic trowel, and the machine's contribution is the flat, sound surface underneath it.
Why Plasterers Keep a Power Float Like This on the Van
- One head, several jobs: the backing disc takes sponge, plastic and scraping discs on hook-and-loop, so the machine changes role in the time it takes to press a new disc on.
- 110 rpm is float speed, not sander speed: slow enough to stay controllable against a wall, which is what makes the tool usable one-handed with the auxiliary grip.
- Class II insulation and a 10 A type C circuit: ordinary site power, with a 1 mm² minimum conductor, so no special supply is needed.
- Low declared vibration: an ah below 2.5 m/s² under EN 60745-2-3:2011 keeps hand-arm exposure planning simple on long preparation days.
- Serviceable by the operator: the carbon brushes come out through side caps with a small screwdriver, and a spare set is in the box.
DED7767 Technical Data From the Dedra Manual
| Property | Value |
|---|---|
| Model | DED7767 |
| Rated voltage and frequency | 230 V, 50 Hz |
| Rated power | 710 W |
| Protection class | II |
| Ingress protection | IP20 |
| Rotational speed | 110 min⁻¹ |
| Disc diameter | 390 mm |
| Permissible working conditions | S2, 15 minutes |
| Sound pressure level LPA | 83.4 dB(A), uncertainty 3 dB(A) |
| Sound power level LWA | 94.4 dB(A), uncertainty 3 dB(A) |
| Vibration ah | <2.5 m/s², uncertainty 1.5 m/s² |
| Test standards | Noise EN 60745-1:2009; vibration EN 60745-2-3:2011 |
| Minimum supply conductor | 1 mm² for tools of 700–1400 W |
| Minimum fuse | 10 A, type C |
| Supplied in the box | Machine, backing disc, plastic disc with mesh, sponge plate, set of screws, screwdriver, set of carbon brushes |
| Manual revision | 7767.100725.V6, valid for devices made after 01.01.2023 |
Two figures in that table do more work than the headline wattage. A sound power level of 94.4 dB(A) puts hearing protection in the mandatory category the manual pictograms already show, and the machine's own mass is not declared in the manual at all — the listing carries a 5 kg despatch weight, which includes packaging and is not a specification for the tool.
Renders World lists the machine at £180.00 each and shows it as available, read from the product endpoint in August 2026. No VAT treatment is displayed alongside that figure, so none is stated here.
How the S2 15-Minute Rating Shapes a Working Day
Plan the work in spells and this machine is comfortable all day: the manual gives its permissible working conditions as S2, 15 minutes, which is short-time duty — a working spell followed by a cool-down before the next one. Building that rhythm into the programme is what keeps the motor healthy across a long refurbishment.
The rating pairs with three other conditions from the same page, and all four are easy to design around once they are known rather than discovered.
- Avoid damp, which the manual states directly and which the IP20 rating supports — this is a dry-conditions tool, so external work waits for a dry spell.
- Never leave it running unattended, and unplug it at the end of the work.
- Do not run it at idle between passes, and do not overload it.
How to Set Up and Use the Machine on the Wall
Assembly is a two-minute job with the tools supplied, and doing it in the manual's order is what keeps the head running true. Every preparation step is carried out with the machine disconnected from the supply.
- Fit the backing disc to the spindle pin, matching the hole to the shape of the pin, then tighten it with the screw provided.
- Press the working disc — sponge, plastic or scraping — onto the backing disc, which holds it on hook-and-loop.
- Check the supply against the rating plate, and where an extension lead is used, keep the conductor at or above the 1 mm² minimum.
- Start the machine horizontally and off the surface, holding the lock-off button on the left of the main handle and then pressing the switch.
- Let it reach full speed before touching the work, then float in semi-circular movements, matching pressure to the task and checking the surface as you go.
Two details from the manual repay attention on vertical work. Stand with feet slightly apart and the torso leaning in slightly, which is how the machine's torque is absorbed by stance rather than wrist; and where the plaster has gone off a little too far, the manual allows the surface to be dampened as you work.
Choosing Discs and Consumables for the DED7767
The manual lists three accessory discs available to buy — codes DED77671, DED77674 and DED77675 — and states that the last two are not part of the standard kit. The collection stocks a wider pad family than that list covers, which makes disc selection a conversation worth having before ordering.
| Disc | Status in the manual | How to order it |
|---|---|---|
| Backing disc | Supplied in the box; carries every working disc | Replacement not listed as an accessory |
| Plastic disc with mesh | Supplied in the box; for larger irregularities, or plaster that has dried too hard | Replacement not listed as an accessory |
| Sponge disc, DED77671 | Purchasable accessory; final smoothing passes on wall surfaces | Order by code |
| DED77674 | Purchasable accessory, not in the box | Function disputed — confirm before ordering |
| DED77675 | Purchasable accessory, not in the box | Function disputed — confirm before ordering |
| Abrasive grid pads | Absent from the manual's accessory list | Stocked here; check fitment on order |
The dispute on those two codes is real and is stated here rather than resolved, because the manual and the titles they are sold under assign them opposite functions. Order the disc by describing the job it has to do and the Renders World team will confirm the code against current stock, which is a safer route than matching a part number from either source.
One further mismatch is worth a check at the point of order: the manual gives the machine's disc as 390 mm, while the pad listings in this collection state a 400 mm working face. Confirming the fitment before a pad order goes out avoids a disc that overhangs the backing plate.
Keeping the DED7767 Running: Brushes, Vents and Discs
Three checks cover almost everything this machine asks for, and all three are quick enough to do at a break. Every one of them happens with the tool unplugged.
- Blow the air inlets clear, ideally with compressed air, and clean plaster residue off the body after every job — the manual singles the vents out as very important, and clogged vents are its listed cause of overheating.
- Inspect the carbon brushes at least every 20 to 30 hours of use, and renew them once they are shorter than 5 mm; there is no wear limiter fitted, which is why the interval is a habit rather than a warning light.
- Check the working disc before each start and work only with serviceable discs — a worn abrasive disc is the manual's stated cause of poor sanding performance.
A motor that starts with difficulty points at worn brushes, and a spare set ships in the box, so the commonest service item on the tool is already on the shelf.
Choosing the DED7767 for Your Type of Work
- Internal lime-cement and gypsum plaster finishing: squarely within the manual's stated purpose, using the sponge discs for the closing passes.
- External plaster floating in dry weather: covered by the same purpose statement, with the IP20 rating setting the weather window.
- Refurbishment stripping and levelling: a strong fit for wallpaper, old plaster layers, mortar squeeze-out and dried plaster on floors.
- Flattening a cured basecoat before a topcoat: practical with light passes so the reinforcing mesh in the EPS adhesives basecoats layer stays covered, though this use sits outside the manual's own wording.
- Sites with no mains supply: this is a 230 V corded tool, so a battery platform suits those better.
Where the work is plaster and preparation, the machine is the right size of investment, and the discs can be added as the jobs call for them. The technique for each stage — pad choice, pressure and pass pattern — is set out in the Renders World guide to power float techniques and tool selection, and the collection page is where the current disc range and prices sit.
FAQ — Using, Powering and Servicing the DED7767
What comes in the box?
Seven items: the machine, the backing disc, a plastic disc with mesh, a sponge plate, a set of screws, a screwdriver and a set of carbon brushes. That covers assembly and first-day floating, with the two accessory discs the manual codes separately bought as needed.
How long can it run before it needs a rest?
The manual rates it S2 15 minutes, which is a short-time duty classification: a fifteen-minute working spell, then a cool-down before the next. Working in spells suits the job anyway, since most surfaces need inspecting between passes.
Which discs fit, and how do I order the right one?
Everything mounts on the backing disc by hook-and-loop, and the manual names three accessory discs by code. Because two of those codes are described differently by the manual and by the titles they are sold under, order by describing the job and have the code confirmed rather than relying on either label.
How often should the brushes be checked?
No less often than every 20 to 30 hours of use, more frequently on heavy use, and they are replaced once shorter than 5 mm. They sit under caps on the sides of the motor and come out with the screwdriver supplied.
Can it be used outdoors?
Yes, for external lime-cement and gypsum plaster, which the manual covers explicitly. Keep it out of damp conditions, as the manual instructs and as the IP20 rating implies, so a dry working window is the condition to plan around.
Technical Documentation — Dedra DED7767