CoroBore® BR20

Twin-edge rough boring tools for flexible boring

Overview

How to use

Success Stories

Assortment

Handling instruction CoroBore rough boring

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Torque

Always use a torque wrench and apply recommended torque on screws for insert and tool assembly torque.

Clamping

Do not clamp damped Silent Tools™ straight over the adaptor body.

Laser-marked scale

The laser-marked scale on the adaptor facilitates setting the diameter.

View more instructions

Set-up

Check machine spindle, run-out, wear and clamping force.

Clean assembly items

Clean all assembly items before assembly. Check inserts and insert seats regularly so they are free from dirt and not damaged.

Replace worn items

Replace worn or exhausted screws, washers and cup springs. It is recommended to replace the cup springs used when clamping the slides every 5th use to keep the pre-clamping functionality in place, while setting the diameter in the pre-setter.

Lubricate once a year

Lubricate all assembly items with oil at least once a year.

Application tips

Tool setting for back boring

• Remove grub screw from top cutting fluid outlet and attach it into lower cutting
• Fluid outlet in order to get correct coolant position
• Rotate cartridge 180°
• Use slide extension if needed
• Reverse rotation direction

Blind hole

When machining a blind hole it is very important to secure that proper chip evacuation takes place.
Correct cutting data is essential to achieve proper chip forming
Ensure/check that the chips do not jam or wear the inserts
Coolant pressure and flow should be sufficient to evacuate the chips
Vertical machines are more critical than horizontal machines for efficient chip evacuation

Interrupted cuts

Machining of interrupted cuts, such as cross holes, set high demands on insert cutting conditions.
Choose a tough grade
Choose a strong, square negative basic-shaped insert for improved process security, valid for stable conditions
Reduce cutting data if there are severe interruptions

Weak machines

When roughing, make sure the machine has the required power and torque needed for the specific boring application. Feed, number of inserts, hole diameter and depth of cut are main affecting parameters.

Recommendations

General recommendations rough boring:

Starting data: v_c 200 m/min (valid when v_c on insert box is bigger than v_c 200 m/min) at short overhang. Check insert box for feed and depth of cut recommendations
v_c = 50% of recommended data on label. If vibrations occur, reduce speed and increase feed. Do not use max recommended feed and a_p at the same time
Usable length to diameter ratio (ULDR) = Boring depth LU / Boring diameter DC

Cutting data: CoroBore® 111

Order code	Grade	Feed range (f_n)			Depth of cut (a_p)			Cutting speed (v_c)
Order code	Grade	Min	Max	Recommended	Min	Max	Recommended	Min	Max	Recommended
SPMT0606-BR	4425	0.10	0.25	0.20	0.6	4.5	2.0	365	460	395
SPMT0606-BM	2025	0.10	0.15	0.10	0.6	4.5	1.8	260	265	265
SPMT0606-BR	3210	0.15	0.30	0.25	0.6	4.5	2.0	285	330	300
SPMT0606-BM	1145	0.10	0.15	0.10	0.6	4.5	1.8	15	20	20
SPMT0808-BR	4425	0.15	0.35	0.20	0.8	6.5	2.5	325	425	395
SPMT0808-BM	2025	0.10	0.25	0.20	0.8	6.5	2.2	225	265	240
SPMT0808-BR	3210	0.20	0.50	0.30	0.8	6.5	2.5	235	315	285
SPMT0808-BM	1145	0.10	0.15	0.10	0.8	6.5	2.2	15	20	20
SPMT1212-BR	4425	0.15	0.40	0.25	1.2	9.0	3.0	305	425	365
SPMT1210-BM	2025	0.10	0.30	0.20	1.0	9.0	2.5	205	265	240
SPMT1212-BR	3210	0.20	0.50	0.30	1.2	9.0	3.0	235	315	285
SPMT1210-BM	1145	0.10	0.20	0.15	1.0	9.0	2.5	10	20	15
SPMT1812-BR	4425	0.20	0.40	0.30	1.2	12.0	3.8	305	395	345
SPMT1810-BM	2025	0.20	0.30	0.25	1.0	12.0	3.0	205	240	225
SPMT1812-BR	3210	0.25	0.50	0.30	1.2	12.0	3.8	235	300	285
SPMT1810-BM	1145	0.10	0.20	0.15	1.0	12.0	3.0	10	20	15

Tightening torque

Insert screw

ISO	ANSI	Non ISO	Code	Size	Torx Plus	Nm	Ft/lbs
CC06	CC2(1.5)		5513 020-03	M2,5	7IP	0.9	0.7
CC09	CC09		5513 020-09	M3,5	15IP	3.0	2.2
CC12	CC43		5513 020-17	M4x0,5	15IP	3.0	2.2
		SP06	5513 020-33	M2,2	7IP	0.8	0.59
		SP08	5513 020-57	M3	9IP	1.7	1.25
		SP12	416.1-833	M3,5	10IP	2	1.48
		SP18	5513 020-25	M4	15IP	3	2.2
SN15	SN54		5512 086-03	M6	20IP	6.4	4.7

Maximum cutting torque and RPM

Kit product codes	Adaptors	Max cutting torque		Max RPM
Kit product codes	Adaptors	Nm	ft-lb	Max RPM
BR20D-29CC06F/SP06Y-C4L	C4-BR20D-A-189	100	74	15000
BR20D-36CC06F/SP06Y-C3L	C3-BR20D-B-205	165	122	11000
BR20D-45CC09F/SP08Y-C3L	C3-BR20D-C-208	290	214	9000
BR20D-45CC09F/SP08Y-C4L	C4-BR20D-C-257	290	214	9000
BR20D-45CC09F/SP08Y-C6L	C6-BR20D-C-284	290	214	11000
BR20D-56CC09F/SP08Y-C4L	C4-BR20D-D-207	350	258	12000
BR20D-56CC09F/SP08Y-C5L	C5-BR20D-D-323	350	258	7000
BR20D-56CC09F/SP08Y-C6L	C6-BR20D-D-350	350	258	8000
BR20D-71CC12F/SP12Y-C5M	C5-BR20D-E-282	580	428	7000
BR20D-71CC12F/SP12Y-C6M	C6-BR20D-E-382	580	428	7000
BR20D-90CC12F/SP12Y-C6M	C6-BR20D-F-380	780	575	5000
BR20D-90CC12F/SP12Y-C8M	C8-BR20D-F-480	780	575	4000
BR20D-116CC12F/SP12Y-C8S	C8-BR20D-G-388	940	693	5000
BR20D-116CC12F/SP12Y-C8M	C8-BR20D-G-478	940	693	4000
BR20D-150CC12F/SP12Y-C8M	C8-BR20D-H-478	1000	738	4000

CoroBore® BR20/CoroBore® BR20 with Silent Tools™ technology

			Insert 90°					Insert 84°
Size	DCN (mm)	DCX (mm)	ISO	ANSI	Nm	Ft/lbs	Screw size	Non-ISO	Nm	Ft/lbs	Screw size
A	23	29	CC06	CC2(1.5)	4.8	3.5	M4	SP06	4.8	3.5	M4
B	28	36	CC06	CC2(1.5)	4.8	3.5	M4	SP06	4.8	3.5	M4
C	35	45	CC09	CC3(2.5)	9	6,6	M5	SP08	9	6,6	M5
D	44	56	CC09	CC3(2.5)	16.0	11.8	M6	SP08	16.0	11.8	M6
E	55	71	CC12	CC43	38.0	28.0	M8	SP12	38.0	28.0	M8
F	70	90	CC12	CC43	75	55	M10	SP12	75	55	M10
G	89	116	CC12	CC43	75	55	M10	SP12	75	55	M10
H	115	150	CC12	CC43	75	55	M10	SP12	75	55	M10

Tool holding

Bending stiffness and torque transmissions are the most important factors when choosing a tool holder for boring operations. First choice should always be tools with Coromant Capto® coupling, which offers excellent repeatability and the best stability characteristics on the market. Use only one adaptive item between the Silent Tools™ adaptor and the machine tool spindle.