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Description
CUTTING WIDTH1.5 mm
CUTTING DEPTH T MAX15 mm
MAX. BAR DIAMETERØ30 mm
INSERT · 2 EDGESMGMN 150
Parting tool 16X16 1.5 mm T15 Varel
Technical data for the holder for Korloy MGMN 150 inserts
| Technical data | |
|---|---|
| Designation | MGEHR 1616-1.5 |
| 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) | 16.25 mm |
| Cutting depth T max | 15 mm |
| Max. parting diameter D max | Ø30 mm |
| Insert pocket | MGMN 150 (width 1.5 mm) |
| Hand | R – right-hand |
MGEHR 1616-1.5 – how it works with MGMN inserts
What this tool can do, screw clamping and a double-edged insert
Parting tool 1.5 mm MGEHR 1616-1.5 is a Varel holder for parting off workpieces from bar stock and cutting external grooves. The MGMN 150 carbide insert is held by a screw clamp from above: the screw pulls the flexible lip of the head against the insert. Replacement takes a dozen or so seconds, without removing the tool from the tool post.
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 1.5 mm slot. This limits the tool to parting off bars up to Ø30 mm, or twice T max.
The dimension S = 16.25 mm means that the cutting edge projects 0.25 mm beyond the side of the 16 mm wide shank. This allows cutting close to the chuck jaws without the shank rubbing against the workpiece face. The 16x16 mm shank with a length of 100 mm fits tool posts on small and medium-sized lathes.
The MGMN 150 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 Ø30 mm, a 1.5 mm kerf, and material loss limited to the insert width.
Cutting external grooves
A 1.5 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 150 has a cutting edge at both ends. One edge dull? Rotate the insert by 180° and use the other.
Material loss: 1.5 mm
Each parting cut turns only 1.5 mm of bar into chips. For 100 parts, this consumes 5 cm less bar than a tool with a 2 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
16.25 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.
Decoding the MGEHR 1616-1.5 designation
The four parts of the MGT system designation, read from the left
Designation: MGEHR 1616-1.5
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.
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.
-1.5
Element 4
insert width
insert width
1.5 mm
-1.5
-1.5
The number after the hyphen is the insert width in millimeters. The pocket accepts MGMN 150 inserts, and T max is 15 mm (bars up to Ø30 mm).
MGT system catalog convention, not ISO 5608 · dimensions: h 16 · B 16 · L 100 · S 16.25 mm
Parting data – speeds and feeds for a 1.5 mm insert
Starting values with coolant; refer to the insert grade data sheet for definitive data
The table provides starting values for coated MGMN 150 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 150 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 150 parting inserts (Korloy MGT system) – width 1.5 mm, length 16 mm, height 3.5 mm |
| ✓ | Other sizes in the -1.5 series available: MGEHR 2020-1.5 (T max 15 mm) |
Varel parting tools for MGMN 150 inserts
MGEHR 2020-1.520x20 mm | L 125 mm | T max 15 mm | Ø30 mmR right-hand
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←
Inserts from other grooving systems, such as DGN, GTN or KGM, do not fit the seat. The 1.5 mm MGEHR 1616-1.5 parting tool combines a 16x16 mm shank with quick insert replacement in a screw-clamped lip. The cutting depth of 15 mm and compatibility with MGMN 150 inserts make it a basic tool for parting and grooving bars up to Ø30 mm. In series production on automatic and CNC lathes, it parts off workpieces from bar stock in every cycle.
Frequently asked questions
An MGMN 150 parting insert (Korloy MGT system) with a width of 1.5 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.
The right-hand R version is standard: the workpiece is held in the chuck to the left of the tool. Choose the left-hand L version when the workpiece is clamped on the opposite side of the tool or when the tool post arrangement on your lathe requires it. Both versions have identical dimensions.
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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