Replaceable Tip Drills SMD Type
MTL Type Suitable for high-efficiency drilling of general steel
X-Type Thinning
DEX Coat
Web thinning with excellent centring
Ɣ Excellent cutting edge strength Large edge treatment is used to reduce breakage of the cutting edge. Ɣ Stable machined hole accuracy X Type thinning achieves excellent centring on entry and stable drilling.
Large cutting edge treatment
Strong peripheral edge
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Ŷ Application Examples: MTL Type
High drilling accuracy even with large diameters Ŷ Drilling Precision
Bore Diameter (inch)
Efficiency (%)
200 Tool Life (pcs)
Improved tool life and efficiency
Tool life Efficiency
Performance Comparison
ø1.305
180
Measured Point (1)
(1)
ø1.303
Part Material : Housing Mild Steel Drill Size : For ø15x5D Cutting Conditions : v c =351 SFM
Part Material : Structural Steel Plate
190
160
Measured Point (2)
(2)
185 holes
(base substrate for construction machinery)
ø1.301
Drill Size : For ø33x5D Cutting Conditions : v c =393 SFM f =0.0098 IPR Cutting Environment : Emulsion Type
180
140
f =0.0118 IPR
Exit
ø1.299
170 holes
140 %
170
120
Hole Depth : 1.26” × 12 holes
ø1.297
160
100
Entrance
100 %
ø1.295
≈
≈
ø1.293
SEC-MultiDrill MTL Type
Competitor's Indexable Drill
Entrance point
Intermediate point
Exit point
MTL-C Type Chamfered edges to eliminate break out in cast iron MEL Type Suitable for exotic alloys such as stainless steel, mild steel, gray cast iron and low rigidity equipment
Overlap Thinning
DEX Coat
Large web thinning angle
Ɣ Excellent cutting edge design for SUS and mild steel (SS, etc.) Large thinning angle solves the convex corner breakage issues specific to mild steel and reduces adhesion breakages with SUS. Ɣ Improved edge chipping resistance in cast iron Edge sharpness improvements in peripheral areas prevent edge chipping around hole openings in cast iron.
Small edge treatment
Sharp peripheral edge
Ŷ 25% reduction in cutting force (thrust) Ɣ The MEL type features 25% lower thrust than the MTL type! 3,000
Ŷ Application Examples (MEL Type)
MEL Type (Cutting Length 49ft)
Competitor's Product (Cutting Length 36ft)
Breakage in Centre
2,500
MEL Type MTL Type
2,000
1,500
1,000
Part Material: Carbon Steel O.D.: ø0.551” Cutting Conditions: v c =262 SFM
500
SEC-MultiDrill MEL type has excellent centring, produces no rifle marks and no cutting edge breakage after 49ft.
Competitor's indexable drill exhibited poor centring and produced rifle marks. The centre of the drill broke after 36ft of drilling.
0
f =0.006
f =0.008 Feed Rate: f (IPR)
f =0.010
Part Material: 304 Stainless Steel, Drill size: For ø14x5D Cutting Conditions: v c =197 SFM, f =0.006”, coolant: Emulsion
Sharper blade type and thinning overlap significantly reduce thrust and improve chip control, allowing stable drilling in low-rigidity setups.
■ Recommended Cutting Conditions Speed: v (SFM) / Feed: f (IPR)
MTL
MTL
MTL
MTL
MTL-C / MEL
MEL
MEL
MEL
Prehard
Ductile
Gray
Stainless
Material
Steels
Steels
Die Steels
Titanium
Inconel
Steels
Drill Tip Recommendations cast irons
cast irons
Steels*
Drill Dia. (inch)
<HB250
HB250˜300
HRC45
–
–
–
–
–
–
v f v f v f
260 ˜ 400 .006 ˜ .012 260 ˜ 400 .006 ˜ .014 260 ˜ 430 .008 ˜ .016
260 ˜ 360 .006 ˜ .012 260 ˜ 360 .006 ˜ .014 260 ˜ 400 .008 ˜ .014
160 ˜ 260 .004 ˜ .008 195 ˜ 295 .006 ˜ .010 195 ˜ 295 .006 ˜ .010
130 ˜ 230 .005 ˜ .009 130 ˜ 230 .006 ˜ .010 130 ˜ 230 .006 ˜ .010
230 ˜ 330 .006 ˜ .012 230 ˜ 330 .006 ˜ .014 260 ˜ 360 .008 ˜ .015
260 ˜ 430 .008 ˜ .012 260 ˜ 430 .008 ˜ .014 300 ˜ 460 .008 ˜ .018
65 ˜ 130 .004 ˜ .008 85 ˜ 150 .004 ˜ .008 85 ˜ 150 .004 ˜ .008
35 ˜ 100 .003 ˜ .004 50 ˜ 115 .003 ˜ .005 50 ˜ 115 .003 ˜ .006
125 ˜ 230 .004 ˜ .008 145 ˜ 240 .004 ˜ .009 160 ˜ 250 .006 ˜ .010
~ .4688
~ .844
~ 1.250
* For difficult to machine stainless steels (316, 302, 304, 17-4ph, etc.) adjust speeds & feeds accordingly.
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