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Description
CUTTING WIDTH3 mm
CUTTING DEPTH T MAX18.5 mm
MAX. BAR DIAMETERØ37 mm
INSERT · 2 EDGESMGMN 300
Left-hand parting tool 16X16 3 mm T18.5 Varel
Technical data for the holder for Korloy MGMN 300 inserts
| Technical data | |
|---|---|
| Designation | MGEHL 1616-3 |
| Type | holder for parting and external grooving |
| Shank height h | 16 mm |
| Shank width B | 16 mm |
| Overall length L | 100 mm |
| Dimension S (to the insert edge) | 16.35 mm |
| Cutting depth T max | 18.5 mm |
| Max. parting diameter D max | Ø37 mm |
| Insert pocket | MGMN 300 (width 3 mm) |
| Hand | L – left-hand |
MGEHL 1616-3 with screw clamping – operating principle
What this tool can do, screw clamping and a double-edged insert
Left-hand parting tool 3 mm MGEHL 1616-3 (Varel) parts off bars up to Ø37 mm and cuts external grooves. It uses MGMN 300 carbide inserts clamped from above by the flexible lip of the head. The clamping screw tightens the lip, and the insert can be replaced in a dozen or so seconds.
The insert edge projects 0.35 mm beyond the side of the shank (S = 16.35 mm with B = 16 mm). When cutting close to the chuck, the cutting edge engages while the shank stays clear of the workpiece face. The 16x16 mm shank with a length of 100 mm fits tool posts on small and medium-sized lathes.
The head forms a thin blade 18.5 mm long, which determines the cutting depth T max. Behind the blade, the head widens to the full shank width and can no longer enter the 3 mm groove. This sets the limit: the tool parts off bars up to Ø37 mm, or twice T max.
The MGMN 300 insert is double-edged: when one edge becomes dull, rotate it by 180° and cut with the other end.
Parting and grooving with the MGEHL 1616-3 tool – typical operations
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 Ø37 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 18.5 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
16 mm
WIDTH B
16 mm
LENGTH L
100 mm
DIMENSION S
16.35 mm
T max is measured from the insert tip to the head shoulder. A groove shallower than 18.5 mm can also be cut in a bar larger than Ø37 mm.
The left panel of the diagram shows the end of the cut: the insert tip is on the bar axis, and the head shoulder touches its surface. The right panel shows cutting edge height: set the edge on the centerline to within ±0.1 mm. Below the centerline, a pip remains; above the centerline, the cutting edge rubs against the material.
MGEHL 1616-3 designation decoder
The four parts of the MGT system designation, read from the left
Designation: MGEHL 1616-3
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.
L
Element 2
hand
hand
Left-hand
L
L
Mirror image of the right-hand MGEHR version with the same dimensions.
1616
Element 3
shank
shank
16x16 mm
1616
1616
The first two digits indicate height h, and the next two indicate width B. Fits a tool post for 16 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 18.5 mm (bars up to Ø37 mm).
MGT system catalog convention, not ISO 5608 · dimensions: h 16 · B 16 · L 100 · S 16.35 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 values apply to coated MGMN 300 inserts used with coolant. Use the higher speeds with rigid clamping and short overhang.
| 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 Ø37 mm carbon steel bar at Vc = 170 m/min: n = (1000 × 170) / (3.14 × 37) ≈ 1460 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 Ø37 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 Ø37 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 |
| ✓ | Right-hand version MGEHR 1616-3 with the same dimensions |
| ✓ | Other available sizes in the -3 series: MGEHL 2020-3 (T max 18 mm), MGEHL 2525-3 (T max 18 mm) |
Varel parting tools and boring bars for MGMN 300 inserts
MGEHR/L 2020-320x20 mm | L 125 mm | T max 18 mm | Ø36 mmR right-hand
←L left-hand
→
←L left-hand
→
MGEHR/L 2525-325x25 mm | L 150 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 (DGN, GTN, KGM) require different seats and do not fit this holder. The 3 mm MGEHL 1616-3 left-hand parting tool parts off workpieces from bar stock up to Ø37 mm and cuts external grooves with a width of 3 mm. When the groove width is a fit dimension, choose an MGGN insert with a tolerance of ±0.025 mm. Groove depth is limited to T max = 18.5 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.
Ø37 mm, or twice the cutting depth T max = 18.5 mm. Larger bars require a holder with a greater cutting depth T max. Grooves shallower than 18.5 mm can also be cut on larger diameters.
Yes. The holder cuts external grooves 3 mm wide and up to 18.5 mm deep. An insert with -M or -T geometry also allows turning with the side of the insert, but with a depth of cut up to 0.8 × 3 mm = 2.4 mm per pass.
A pip remains when the cutting edge is not on the lathe centerline. Set it within ±0.1 mm and check that the insert is fully seated in the pocket. Over the final 2 mm before the centerline, reduce the feed by as much as 75%.
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| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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