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Description
CUTTING WIDTH3 mm
CUTTING DEPTH T MAX18 mm
MAX. BAR DIAMETERØ36 mm
INSERT · 2 EDGESMGMN 300
Parting tool 25X25 3 mm T18 Varel
Technical data for the holder for Korloy MGMN 300 inserts
| Technical data | |
|---|---|
| Designation | MGEHR 2525-3 |
| Type | holder for parting and external grooving |
| Shank height h | 25 mm |
| Shank width B | 25 mm |
| Overall length L | 150 mm |
| Dimension S (to the insert edge) | 25.4 mm |
| Cutting depth T max | 18 mm |
| Max. parting diameter D max | Ø36 mm |
| Insert pocket | MGMN 300 (width 3 mm) |
| Hand | R – right-hand |
MGEHR 2525-3 – parting and grooving with an MGMN 300 insert
What this tool can do, screw clamping and a double-edged insert
The Varel MGEH holder series also includes 3 mm parting tool MGEHR 2525-3 for parting off workpieces and cutting grooves. The cutting depth of 18 mm allows bars up to Ø36 mm to be parted off. The MGMN 300 insert is held by a screw clamp from above, allowing replacement without removing the tool from the tool post.
The dimension S = 25.4 mm means that the cutting edge projects 0.4 mm beyond the side of the 25 mm wide shank. This allows cutting close to the chuck jaws without the shank rubbing against the workpiece face. The 25x25 mm shank with a length of 150 mm provides the rigidity required by a narrow cutting edge in a confined groove.
The insert is supported by the narrow blade of the head, 18 mm long — this is the cutting depth T max. Beyond this point, the body widens to the shank width, so only the blade fits into the 3 mm slot. This limits the tool to parting off bars up to Ø36 mm, or twice T max.
The MGMN 300 insert has two cutting edges at opposite ends. When the first becomes dull, rotate the insert by 180° and use the second.
What this tool can do – parting and grooving
Parting – cutting a part off a bar
The blade enters the bar all the way to the axis and the part separates. Bars up to Ø36 mm, a 3 mm kerf, and material loss limited to the insert width.
Cutting external grooves
A 3 mm groove between shaft shoulders or a retaining ring groove at the end of a journal, up to 18 mm deep. Cut wider grooves with several adjacent passes.
Screw clamping from above
The screw pulls the head's flexible lip down against the insert. The insert can be replaced without removing the tool from the tool post.
Double-edged insert
MGMN 300 has a cutting edge at both ends. One edge dull? Rotate the insert by 180° and use the other.
Material loss: 3 mm
Each parting cut turns only 3 mm of bar into chips. For 100 parts, this consumes 10 cm less bar than a tool with a 4 mm insert.
Dimensions and cutting reach – dimensional drawing
Side view and top view
HEIGHT h
25 mm
WIDTH B
25 mm
LENGTH L
150 mm
DIMENSION S
25.4 mm
Measure T max from the insert tip to the point where the blade transitions into the wider head. Grooves up to 18 mm deep can also be cut in bars larger than Ø36 mm.
At the end of the cut, the insert tip is at the bar centerline and the shoulder of the head touches the bar surface. The second panel shows the cutting edge height: the edge must be on the centerline within ±0.1 mm. An edge below center leaves a pip; above center, it rubs against the material.
Decoding the MGEHR 2525-3 designation
The four parts of the MGT system designation, read from the left
Designation: MGEHR 2525-3
MGEH
Element 1
holder type
holder type
For parting
MGEH
MGEH
External grooving and parting holder for the MGT insert system, with screw-operated top clamping.
R
Element 2
hand
hand
Right-hand
R
R
Standard configuration with the workpiece clamped in the chuck to the left of the tool. The mirror-image version is designated MGEHL.
2525
Element 3
shank
shank
25x25 mm
2525
2525
The first two digits indicate height h, and the next two indicate width B. Fits a tool post for 25 mm tools.
-3
Element 4
insert width
insert width
3 mm
-3
-3
The number after the hyphen is the insert width in millimeters. The pocket accepts MGMN 300 inserts, and T max is 18 mm (bars up to Ø36 mm).
MGT system catalog convention, not ISO 5608 · dimensions: h 25 · B 25 · L 150 · S 25.4 mm
Parting data – speeds and feeds for a 3 mm insert
Starting values with coolant; refer to the insert grade data sheet for definitive data
The table provides starting values for coated MGMN 300 inserts with coolant. Select the upper speed range when clamping is rigid and tool overhang is short.
| Workpiece material | Vc [m/min] | fn [mm/rev] |
|---|---|---|
| PCarbon steel | 140–190 | 0.07–0.15 |
| PAlloy steel | 120–160 | 0.07–0.15 |
| PHardened steel | 60–120 | 0.07–0.12 |
| MStainless steel | 120–160 | 0.07–0.15 |
| KCast iron | 150–200 | 0.07–0.15 |
Starting spindle speed: n = (1000 × Vc) / (π × D). For a Ø36 mm carbon steel bar at Vc = 170 m/min: n = (1000 × 170) / (3.14 × 36) ≈ 1500 rpm. At constant spindle speed, the cutting speed decreases to zero at the centerline, so enable constant surface speed (G96) with a spindle speed limit on a CNC lathe.
▲
Operating limitations
Do not part off bars larger than Ø36 mm: the shoulder of the head will contact the material before the cutting edge reaches the centerline. Keep overhang from the tool post as short as possible. Over the final 2 mm before the centerline, reduce the feed by as much as 75% and direct coolant straight into the cut.
Installing the MGMN 300 insert in 3 steps
1Loosen
the clamping screw by 2–3 turns
2Seat
clean the pocket, slide the insert in until fully seated
3Tighten
and check that the cutting edge is on the lathe centerline ±0.1 mm
✓Ready
parting off bars up to Ø36 mm
Cutting insert not included
COMPATIBLE WITH:
| ✓ | MGMN 300 parting inserts (Korloy MGT system) – width 3.0 mm, length 21 mm, height 4.8 mm |
| ✓ | Left-hand MGEHL 2525-3 version with the same dimensions |
| ✓ | Other sizes in the -3 series available: MGEHR 1616-3 (T max 18.5 mm), MGEHR 2020-3 (T max 18 mm) |
Varel parting tools and boring bars for MGMN 300 inserts
MGEHR/L 1616-316x16 mm | L 100 mm | T max 18.5 mm | Ø37 mmR right-hand
←L left-hand
→
←L left-hand
→
MGEHR/L 2020-320x20 mm | L 125 mm | T max 18 mm | Ø36 mmR right-hand
←L left-hand
→
←L left-hand
→
MGIVR/L 2520-3Ø20 mm | Ømin 25 mm | L 150 mm | T max 6 mmR right-hand
←L left-hand
→
←L left-hand
→
Inserts from other grooving systems, such as DGN, GTN or KGM, do not fit the seat. The 3 mm MGEHR 2525-3 parting tool combines a 25x25 mm shank with quick insert replacement in a screw-clamped lip. The cutting depth of 18 mm and compatibility with MGMN 300 inserts make it a basic tool for parting and grooving bars up to Ø36 mm. In maintenance work, it is useful for making replacement bushings, pins and spacer rings.
Frequently asked questions
An MGMN 300 parting insert (Korloy MGT system) with a width of 3.0 mm, length of 21 mm and height of 4.8 mm. It is double-ended, so each insert provides two cutting edges. DGN, GTN and KGM inserts do not fit this pocket.
Ø36 mm, or twice the cutting depth T max = 18 mm. Larger bars require a holder with a greater cutting depth T max. Grooves shallower than 18 mm can also be cut on larger diameters.
Start at approximately 1500 rpm for carbon steel, at Vc = 170 m/min with a 3 mm insert. Cutting speed decreases closer to the centerline, so use G96 constant surface speed with a spindle speed limit on a CNC lathe. For stainless steel, use Vc 120–160 m/min.
No. The tool is sold without a cutting insert, and the MGMN 300 insert must be purchased separately. Inserts in different carbide grades fit the same holder, allowing one tool to machine steel, stainless steel and cast iron.
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All orders are delivered by courier company GLS. For orders exceeding 369 PLN gross shipping is FREE
| Courier GLS | Przelew24 / Prepayment | 14,76 zł gross | Delivery time 1 working day |
| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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