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Description
CUTTING WIDTH2 mm
CUTTING DEPTH T MAX18 mm
MAX. BAR DIAMETERØ36 mm
INSERT · 2 EDGESMGMN 200
Left-hand parting tool 20X20 2 mm T18 Smoxh
Technical data for the holder for Korloy MGMN 200 inserts
| Technical data | |
|---|---|
| Designation | BDKT L 2020 K2C T18 |
| 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 | 18 mm |
| Max. parting diameter D max | Ø36 mm |
| Insert pocket | MGM. 2C (MGMN 200, width 2 mm) |
| Hand | L – left-hand (right-hand version: SM09455) |
BDKT-L 2020 K2C T18 – 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 BDKT-L 2020 K2C T18 by Smoxh. 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 jaw of the head, tightened with a BKTV M6x25 screw. You can replace it 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, 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 2 mm slot. This limits the tool to parting off bars up to Ø36 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 Ø36 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 18 mm deep. Cut wider grooves with several adjacent passes.
Screw clamping from above
The BKTV M6x25 screw draws the flexible lip of the head against the insert. Change the insert with an AA5 key 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 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.
Designation decoder for BDKT L 2020 K2C T18
Five elements of the Smoxh code, read from the left
Designation: BDKT L 2020 K2C T18
BDKT
Element 1
holder type
holder type
For parting
BDKT
BDKT
Smoxh series for external grooving and parting with screw clamping. The counterpart for internal grooving is designated BIKT.
L
Element 2
hand
hand
Left-hand
L
L
A mirror image of the right-hand version with the same dimensions. The R version has code SM09455.
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.
K2C
Element 4
insert pocket
insert pocket
MGM. 2C
K2C
K2C
K – Korloy MGMN insert system, 2 – cutting width of 2 mm. Versions K2C…K8C accept inserts from 2 to 8 mm.
T18
Element 5
depth
depth
T max 18 mm
T18
T18
Blade length from the insert tip to the head shoulder. Maximum parting diameter is 2 × T max = Ø36 mm.
Smoxh 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 Ø36 mm carbon steel bar at Vc = 180 m/min: n = (1000 × 180) / (3.14 × 36) ≈ 1590 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 200 insert in 3 steps
1Loosen
the BKTV M6x25 screw with the wrench AA5, 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 200 parting inserts (Smoxh: MGM. 2C) – width 2.0 mm, length 16 mm, height 3.5 mm |
| ✓ | BKTV M6x25 clamping screw (spare part) and AA5 wrench |
| ✓ | Right-hand version BDKT-R 2020 K2C T18 (SM09455) with the same dimensions |
Smoxh parting tools and boring bars for MGMN 200 inserts
BDKT R/L 1212 K2C T1512x12 mm | L 100 mm | T max 15 mm | Ø30 mmR right-hand
←L left-hand
→
←L left-hand
→
BDKT R/L 1616 K2C T1816x16 mm | L 125 mm | T max 18 mm | Ø36 mmR right-hand
←L left-hand
→
←L left-hand
→
BDKT R/L 1616 K2C T1216x16 mm | L 125 mm | T max 12 mm | Ø24 mmR right-hand
←L left-hand
→
←L left-hand
→
BDKT R/L 1616 K2C T2116x16 mm | L 125 mm | T max 21 mm | Ø42 mmR right-hand
←L left-hand
→
←L left-hand
→
BDKT R/L 2020 K2C T1220x20 mm | L 125 mm | T max 12 mm | Ø24 mmR right-hand
←L left-hand
→
←L left-hand
→
BDKT R/L 2525 K2C T1825x25 mm | L 150 mm | T max 18 mm | Ø36 mmR right-hand
←L left-hand
→
←L left-hand
→
BDKT R/L 3232 K2C T1832x32 mm | L 170 mm | T max 18 mm | Ø36 mmR right-hand
←L left-hand
→
←L left-hand
→
BIKT R/L 16 K2C T4Ø16 mm | Ømin 20 mm | L 150 mm | T max 4 mmR right-hand
←L left-hand
→
←L left-hand
→
BIKT R/L 20 K2C T6Ø20 mm | Ømin 26 mm | L 170 mm | T max 6 mmR right-hand
←L left-hand
→
←L left-hand
→
BIKT R/L 25 K2C T7Ø25 mm | Ømin 32 mm | L 200 mm | T max 7 mmR right-hand
←L left-hand
→
←L left-hand
→
Inserts from other grooving systems, such as DGN, GTN or KGM, do not fit the pocket. The left-hand 2 mm BDKT-L 2020 K2C T18 parting tool cuts carbon steel at a speed of 150–200 m/min and a feed of 0.05–0.12 mm/rev. With parting off bars up to Ø36 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 (in the Smoxh catalog: MGM. 2C) with a width of 2.0 mm, length of 16 mm, and height of 3.5 mm. It is double-ended, so one 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. For larger bars, choose the 1616 K2C T21 version (up to Ø42 mm). Grooves shallower than 18 mm can also be cut on larger diameters.
Start at approximately 1590 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.
Product accessories
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