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Metallographic Grinding and Polishing Machine

2026.10.12 13:35:17

This four-minute clip is a walkthrough of the DR semi-automatic metallographic specimen grinding and polishing machine from Derui. It opens at the rear of the machine where the connections are made, moves to the front to show the grinding head being raised and lowered, and then works back and forth between the head and the touch screen: the fields the operator sets, the parameter call dialog, and the disc operation screen with its preset speeds. It closes with the head brought back down onto the work area.

4:03

Clip length

φ250 mm

Published disc diameter

50–1000 r/min

Published disc speed range

Samples per run (published)

What This Video Shows

The clip is an operation walkthrough rather than a product tour, and it carries no caption track, so there is no transcript to follow. What is described below comes from the frames of the clip together with the machine's published figures.

What the walkthrough covers

▸ The connections at the rear of the machine: multi-pin connectors on the head unit and on the base, a hose, and a water line fitted onto a brass quick-connect.
▸ The grinding head being raised and lowered by hand, with the plate under the head carrying four positions.
▸ The main screen: the fields the operator works with — disc speed, head speed, speed mode, time, light and pressure.
▸ The parameter call dialog, where a stored set of values is brought up before a run.
▸ The disc operation screen, with four preset speeds set out in the corners and the disc speed shown in the centre.
▸ The head brought back down onto the work area, which is where the clip ends.

The screen, screen by screen

The panel is a touch screen and the clip works through it more than once. The main screen is laid out as a grid: disc speed and head speed are both read out in r/min, with head, light, speed mode, time and pressure ranged alongside them. The speed mode row lists the quick speeds, and the strip along the bottom of the screen carries a pair of rotation arrows, which match the forward and reverse rotation the product page describes. The parameter call dialog brings up a stored group of values, listing disc speed, head speed, a preset number and a time. The disc operation screen puts its four preset speeds in the corners and the disc speed in the middle.

Reading note: this is a demonstration on one machine. Which speeds, which times and which consumables your own preparation uses are fixed by the procedure your laboratory works to, not by the clip. What the clip is good for is showing you where each of those settings lives on the panel.

Working Through the Machine: The Order the Clip Follows

Step 1 · Make the connections

The clip opens at the back of the machine. Multi-pin connectors are fitted to the head unit and to the base, a hose is led away, and a water line is pushed onto a brass quick-connect before the camera moves to the front.

Step 2 · Raise the head

At the front, the grinding head is lifted and lowered by hand. The plate hanging under the head carries four positions, and the work area beneath it is what the head is brought down onto.

Step 3 · Set the disc speed

On the disc operation screen four preset speeds sit in the corners, inside the published 50–1000 r/min range. The same quick speeds appear as a row on the main screen, next to the head speed and the time.

Step 4 · Bring the head down

The clip ends with the head lowered onto the work area and the operator back at the screen. The published description adds what follows: once the sample is in the clamping plate, one key starts the grinding head and the disc together.

Two published details sit behind those steps. The machine is described as grinding and polishing four samples at a time, and the disc and the grinding head can be run independently or together, with a one-key switch between the manual and automatic modes.

Operation-Relevant Published Specifications

Item	Published specification	Why it matters when you run the machine
Disc diameter	Standard φ250 mm; other sizes customizable.	The disc is the surface the specimens are worked against, so its size goes with the holder and with the size of the mounted specimen.
Disc speed	50–1000 r/min, stepless speed regulation; eight fixed speed settings.	The range has to reach both the coarser grinding steps and the final polishing step, and the eight fixed settings give repeatable points inside it.
Rotation direction	Forward and reverse rotation, selected on the screen.	Direction is one of the settings a preparation procedure fixes for a given step, so it has to be settable rather than assumed.
Grinding head speed	60 RPM.	The rate the head turns at while the specimens are held against the disc. The panel shows head speed as its own field, separate from the disc.
Head pressurization	Spring mechanical loading, with adjustable pressure; no gas source is required.	The load on the specimens is set mechanically, so the bench does not have to be provided with a compressed-air supply.
Samples per run	Four samples at a time; four clamps.	This is throughput. It sets how many mounted specimens one run of a given step will cover.
Countdown	Time can be set on the panel; the machine shuts down when the time is up.	The duration of a step is held by the machine rather than watched, which is what makes one run comparable with the next.
Cooling and the faucet	Built-in cooling device; 304 stainless steel faucet.	The published purpose of the cooling device is to keep the specimen from overheating while it is being worked; the clip shows the faucet and a water line serving the work area.
Footprint, weight and power	430 × 730 × 530 mm; 60 kg; 220 V / 50 Hz; 0.5 kW.	Bench space, whether it can be moved by hand, and the supply to have ready before it is positioned.

Selection note: the product page describes the move from grinding to polishing as a change of consumable — metallographic sandpaper, then polishing cloth — with the disc speed adjusted for each. It lists no test standard for this model, so the number of steps, the grits and the times are set by the preparation procedure your laboratory works to rather than by the machine. If your procedure fixes those values, send them with the enquiry and they can be checked against the published 50–1000 r/min range and the eight fixed speed settings.

What the Video Shows and What It Does Not

What it shows is the machine as the operator meets it: the connections at the rear, the grinding head being raised and lowered by hand, the touch screen being worked through, the fields on the main screen, the parameter call dialog, and the disc operation screen with its preset speeds. If you are specifying this class of machine, that is the part a specification table cannot give you — where each setting sits and how the panel is laid out.

What it does not show matters just as much. No specimen is loaded into the holder in the clip and the work area shown is empty, so it is not a record of a preparation run: no water is seen running, the disc is not seen turning, no timing of a full grinding and polishing sequence is shown, and there is no before and after microstructure or polished surface. The clip also names no test standard and no criterion for accepting a prepared specimen, and it contains no calibration or verification record. Those come from the procedure your laboratory works to and from the documents that ship with the machine.

What to Confirm Before Ordering

▸ The specimen: the diameter and the height of your mounted specimens, measured against the standard φ250 mm disc, since other disc sizes are quoted on request.
▸ The count per run: whether four samples at a time matches the work you have to get through, because that is the published capacity of one run.
▸ The procedure: how many grinding and polishing steps you work to, the sandpaper and the cloth each step uses, and the disc speed you want for each — checked against 50–1000 r/min and the eight fixed settings.
▸ The load: what pressure your procedure expects on the specimens, given spring mechanical loading with adjustable pressure.
▸ The water: where the supply and the drain will go, and how the built-in cooling device and the supplied faucet fit the bench you have.
▸ The site: a 220 V / 50 Hz supply drawing 0.5 kW, and bench or floor space for a machine measuring 430 × 730 × 530 mm and weighing 60 kg.

What to Send With an Enquiry

▸ What you are preparing: the material and the diameter of the mounted specimen.
▸ Your preparation sequence, step by step, and the consumable each step uses.
▸ The disc speed and the time you want held for each step.
▸ How many specimens you need per run, and how many runs a day.
▸ Your site supply and the bench space available for the machine.

Frequently Asked Questions

What does this video show?

A walkthrough of a DR-HMPB-1 semi-automatic metallographic specimen grinding and polishing machine: the connections made at the rear, the grinding head raised and lowered by hand, and the touch screen worked through — the main screen fields, the parameter call dialog and the disc operation screen with its preset speeds.

How many specimens does it prepare at a time?

Four. The published figures are four samples at a time and four clamps, and the plate visible under the grinding head in the clip carries four positions to match.

What disc speeds are available?

The published range is 50–1000 r/min with stepless regulation, plus eight fixed speed settings. The disc operation screen in the clip carries four preset speeds in its corners, and the main screen repeats them as a row next to the head speed and the time.

Does it need a compressed-air supply?

No. The published pressurization method is spring mechanical loading with adjustable pressure, and the page states that no gas source is required for sample pressurization. What the clip shows at the rear are the electrical connectors, a hose and a line led towards the work area, alongside the water fitting.

What changes between grinding and polishing?

The consumable, and the settings that go with it. The published description has metallographic sandpaper and polishing cloth being swapped to take the samples through both processes, with the disc speed adjusted between them. The clip itself is the panel walkthrough; the sequence of grits and times is the part you set.

Which standard does the machine work to?

The product page for this model lists no test standard, and the clip names none either. For metallographic preparation that is normal, because the sequence, the consumables and the acceptance criterion come from the laboratory's own procedure. Tell us the procedure on the enquiry and it can be checked against the published disc speed range, the head speed and the four-sample capacity.

Video Summary

In a little over four minutes this clip walks through a Derui semi-automatic metallographic specimen grinding and polishing machine in the order an operator meets it: the connections at the rear, the grinding head raised and lowered at the front, and then the touch screen — the main screen fields, the parameter call dialog, the disc operation screen with its preset speeds, and the head brought back down onto the work area at the end.

The figures behind what you see are published on the product page: a standard φ250 mm disc with other sizes customizable, a disc speed of 50–1000 r/min with stepless regulation and eight fixed speed settings, a grinding head speed of 60 RPM, spring mechanical loading with no gas source required, four samples at a time, a built-in cooling device with a 304 stainless steel faucet, and a 60 kg machine measuring 430 × 730 × 530 mm on a 220 V / 50 Hz supply. What the clip cannot tell you is how your own specimens will come out — that is settled by the preparation procedure you run and by the dressed surface the procedure is checked against.

Need a metallographic grinding and polishing machine?

Send us the material you are preparing, your step sequence and the disc speeds through our contact page, and we will confirm the disc size, the holder and the settings your preparation needs.