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Description
CUTTING WIDTH2 mm
CUTTING DEPTH T MAX15 mm
MAX. BAR DIAMETERØ30 mm
INSERT · 2 EDGESMGMN 200
Left-hand parting tool 20X20 2 mm T15 Varel
Technical data for the holder for Korloy MGMN 200 inserts
| Technical data | |
|---|---|
| Designation | MGEHL 2020-2 |
| Type | holder for parting and external grooving |
| Shank height h | 20 mm |
| Shank width B | 20 mm |
| Overall length L | 125 mm |
| Dimension S (to the insert edge) | 20.3 mm |
| Cutting depth T max | 15 mm |
| Max. parting diameter D max | Ø30 mm |
| Insert pocket | MGMN 200 (width 2 mm) |
| Hand | L – left-hand |
MGEHL 2020-2 – construction and clamping of the 2 mm insert
What this tool can do, screw clamping and a double-edged insert
For parting off workpieces from bar stock and cutting external grooves, use left-hand parting tool 2 mm MGEHL 2020-2 by Varel. The holder accepts a double-edged MGMN 200 carbide insert with a width of 2 mm. The insert is clamped from above by the flexible lip of the head, tightened by a screw. It can be replaced without removing the tool from the tool post.
The MGMN 200 insert has two cutting edges at opposite ends. When the first becomes dull, rotate the insert by 180° and use the second.
The insert is supported by the narrow blade of the head, 15 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 2 mm slot. This limits the tool to parting off bars up to Ø30 mm, or twice T max.
Dimension S = 20.3 mm means that the cutting edge projects 0.3 mm beyond the side of the 20 mm wide shank. This allows cutting close to the chuck jaws without the shank rubbing against the workpiece face. The 20x20 mm shank with a length of 125 mm is a common size for tool posts on conventional and CNC lathes.
Applications of the 2 mm parting tool – parting off workpieces 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 Ø30 mm, a 2 mm kerf, and material loss limited to the insert width.
Cutting external grooves
A 2 mm groove between shaft shoulders or a retaining ring groove at the end of a journal, up to 15 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 200 has a cutting edge at both ends. One edge dull? Rotate the insert by 180° and use the other.
Material loss: 2 mm
Each parting cut turns only 2 mm of bar into chips. For 100 parts, this consumes 10 cm less bar than a tool with a 3 mm insert.
Dimensions and cutting reach – dimensional drawing
Side view and top view
HEIGHT h
20 mm
WIDTH B
20 mm
LENGTH L
125 mm
DIMENSION S
20.3 mm
Measure T max from the insert tip to the point where the blade transitions into the wider head. Grooves up to 15 mm deep can also be cut in bars larger than Ø30 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.
MGEHL 2020-2 designation decoder
The four parts of the MGT system designation, read from the left
Designation: MGEHL 2020-2
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.
L
Element 2
hand
hand
Left-hand
L
L
Mirror image of the right-hand MGEHR version with the same dimensions.
2020
Element 3
shank
shank
20x20 mm
2020
2020
The first two digits indicate height h, and the next two indicate width B. Fits a tool post for 20 mm tools.
-2
Element 4
insert width
insert width
2 mm
-2
-2
The number after the hyphen is the insert width in millimeters. The pocket accepts MGMN 200 inserts, and T max is 15 mm (bars up to Ø30 mm).
MGT system catalog convention, not ISO 5608 · dimensions: h 20 · B 20 · L 125 · S 20.3 mm
Parting data – speeds and feeds for a 2 mm insert
Starting values with coolant; refer to the insert grade data sheet for definitive data
The table provides starting values for coated MGMN 200 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 | 150–200 | 0.05–0.12 |
| PAlloy steel | 130–180 | 0.05–0.12 |
| PHardened steel | 90–130 | 0.05–0.10 |
| MStainless steel | 130–160 | 0.05–0.12 |
| KCast iron | 150–210 | 0.05–0.12 |
Starting spindle speed: n = (1000 × Vc) / (π × D). For a Ø30 mm carbon steel bar at Vc = 180 m/min: n = (1000 × 180) / (3.14 × 30) ≈ 1910 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 Ø30 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 200 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 Ø30 mm
Cutting insert not included
COMPATIBLE WITH:
| ✓ | MGMN 200 parting inserts (Korloy MGT system) – width 2.0 mm, length 16 mm, height 3.5 mm |
| ✓ | Right-hand version MGEHR 2020-2 with the same dimensions |
| ✓ | Other available sizes in the -2 series: MGEHL 1616-2 (T max 15 mm), MGEHL 2525-2 (T max 15 mm) |
Varel parting tools and boring bars for MGMN 200 inserts
MGEHR/L 1616-216x16 mm | L 100 mm | T max 15 mm | Ø30 mmR right-hand
←L left-hand
→
←L left-hand
→
MGEHR/L 2525-225x25 mm | L 150 mm | T max 15 mm | Ø30 mmR right-hand
←L left-hand
→
←L left-hand
→
MGIVR/L 2520-2Ø20 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 2 mm MGEHL 2020-2 left-hand parting tool machines carbon steel at a cutting speed of 150–200 m/min and a feed of 0.05–0.12 mm/rev. When parting off bars up to Ø30 mm, direct coolant into the cut and reduce the feed before reaching the centerline. It is suitable for toolrooms and one-off machining on CNC and conventional lathes.
Frequently asked questions
An MGMN 200 parting insert (Korloy MGT system) with a width of 2.0 mm, length of 16 mm and height of 3.5 mm. It is double-ended, so each insert provides two cutting edges. DGN, GTN and KGM inserts do not fit this pocket.
Ø30 mm, or twice the cutting depth T max = 15 mm. Larger bars require a holder with a greater cutting depth T max. Grooves shallower than 15 mm can also be cut on larger diameters.
Start at approximately 1910 rpm for carbon steel, at Vc = 180 m/min with a 2 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 130–160 m/min.
No. The tool is sold without a cutting insert, and the MGMN 200 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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| 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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