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MBU-Micro Bore Units

Home / Product / Finish Boring Cartridges / MBU-Micro Bore Units
  • Precision Finish Boring Unit with high accuracy & repeatability.
  • Used for machining close tolerances.
  • Facilitates precision adjustment with least count of 1 micron (0.001mm) radially.
  • Can be mounted in blind holes with provision of adjustment from the top.
  • Self-clamping / Self-locking units i.e., no tightening & loosening of screws involved.
  • Pre-loaded (pre-tensioned) assembly guaranteeing practically “Zero” Backlash.
  • Minimum diameter for finish boring is 19mm.
  • Adjustment can be done directly while the tool is on the machine, thus reducing downtime or setting time.
  • Standard products (88 variants) available for ID boring, back boring, OD turning and undercut machining applications.
  • Directly interchangeable with FA & FV fine boring units or equivalent.

MBU - Angular Mounting Type

sr no Item Code Insert Db L1 F1 Dmin Mounting Screw Insert Screw Torx Spanner
LH RH
1 RT MBU ALW 02 14 RT MBU ARW 02 14 WC..0201.. 14 11.50 1.00 20.00 RTMS14 M2.0 T6/T8 RTS14
2 RT MBU ALC 04 14 RT MBU ARC 04 14 CC..04T0.. 14 11.50 1.00 20.00 RTMS14 M2.0 T6/T8 RTS14
3 RT MBU ALT 06T1 14 RT MBU ART 06T1 14 TC..06T1.. 14 11.50 0.20 20.00 RTMS14 M2.0 T6/T8 RTS14
4 RT MBU ALT 0601 14 RT MBU ART 0601 14 TC..0601.. 14 11.50 0.20 20.00 RTMS14 M2.0 T6/T8 RTS14
5 RT MBU ALC 06 16 RT MBU ARC 06 16 CC..0602.. 16 14.30 0.45 25.90 RTMS16 M2.5 T8/T10 RTS16
6 RT MBU ALT 06T1 16 RT MBU ART 06T1 16 TC..06T1.. 16 14.30 0.20 25.40 RTMS16 M2.0 T6/T10 RTS16
7 RT MBU ALT 0601 16 RT MBU ART 0601 16 TC..0601.. 16 14.30 0.20 25.40 RTMS16 M2.0 T6/T10 RTS16
8 RT MBU ALC 09 20 RT MBU ARC 09 20 CC..09T3.. 20 19.10 1.00 33.10 RTMS20 M3.5 T15/T10 RTS20
9 RT MBU ALT 09 20 RT MBU ART 09 20 TC..0902.. 20 19.10 1.00 33.10 RTMS20 M2.2 T7/T10 RTS20
10 RT MBU ALTP 09 20 RT MBU ARTP 09 20 TP..0902.. 20 19.10 1.00 33.10 RTMS20 M2.5 T8/T10 RTS20
11 RT MBU ALD 07 20 RT MBU ARD 07 20 DC..0702.. 20 19.10 1.00 33.10 RTMS20 M2.5 T8/T10 RTS20
12 RT MBU ALC 09 22 RT MBU ARC 09 22 CC..09T3.. 22 23.00 1.10 42.60 RTMS22 M3.5 T15 RTS22
13 RT MBU ALT 1102 22 RT MBU ART 1102 22 TC..1102.. 22 23.00 1.10 42.60 RTMS22 M2.5 T8/T15 RTS22
14 RT MBU ALT 1103 22 RT MBU ART 1103 22 TC..1103.. 22 23.00 1.10 42.60 RTMS22 M2.5 T8/T15 RTS22
15 RT MBU ALTP 11 22 RT MBU ARTP 11 22 TP..1103.. 22 23.00 1.10 42.60 RTMS22 M3.0 T10/T15 RTS22
16 RT MBU ALD 07 22 RT MBU ARD 07 22 DC..0702.. 22 25.00 2.30 42.60 RTMS22 M2.5 T8/T15 RTS22
17 RT MBU ALC 12 32 RT MBU ARC 12 32 CC..1204.. 32 33.30 1.00 60.60 RTMS32 M4.5 T20/3MM RTS32
18 RT MBU ALT 16 32 RRT MBU ART 16 32 TC..16T3.. 32 33.30 1.20 60.60 RTMS32 M3.5 T15/3MM RTS32
19 RT MBU ALTP 16T3 32 RT MBU ARTP 16T3 32 TP..16T3.. 32 33.30 1.20 60.60 RTMS32 M3.5 T15/3MM RTS32
20 RT MBU ALTP 1604 32 RT MBU ARTP 1604 32 TP..1604.. 32 33.30 1.20 60.60 RTMS32 M4.0 T15/3MM RTS32
  • Micro Bore Units are delivered with all required spares such as insert screw, mounting screws, spanner, torx keys & allen keys.
  • Inserts are not included with Micro Bore Units.
  • Spares sold separately as well and can be ordered as per the ordering code shown in above table.
  • Minimum diameter (Dmin) calculated based on 0.4mm insert nose radius.
  • MBU variants with DC..0702.. insert are specially designed for close tolerance undercut applications.
  • Maximum recommended material removal is 0.5mm diametrically.
  • Customized MBU for special requirements can also be provided but will be made to order with a lead time of 3-6 weeks.

MBU - Straight Mounting Type

Sr. No Item Code Insert Db L1 F1 Dmin Mounting Screw Insert Screw Torx Spanne
LH RH
1 RT MBU SLW 02 14 RT MBU SRW 02 14 WC..0201.. 14 11.0 4.1 22.0 RTMS14 M2.0 T6/T8 RTS14
2 RT MBU SLC 04 14 RT MBU SRC 04 14 CC..04T0.. 14 11.0 4.1 22.0 RTMS14 M2.0 T6/T8 RTS14
3 RT MBU SRT 06T1 14 RT MBU SRT 06T1 14 TC..06T1.. 14 11.0 4.1 22.0 RTMS14 M2.0 T6/T8 RTS14
4 RT MBU SLT 0601 14 RT MBU SRT 0601 14 TC..0601.. 14 11.0 4.1 22.0 RTMS14 M2.0 T6/T8 RTS14
5 RT MBU SLC 06 16 RT MBU SRC 06 16 CC..0602.. 16 13.3 5.1 27.6 RTMS16 M2.5 T8/T10 RTS16
6 RT MBU SLT 06T1 16 RT MBU SRT 06T1 16 TC..06T1.. 16 13.3 4.1 27.1 RTMS16 M2.0 T6/T10 RTS16
7 RT MBU SLT 0601 16 RT MBU SRT 0601 16 TC..0601.. 16 13.3 4.1 27.1 RTMS16 M2.0 T6/T10 RTS16
8 RT MBU SLC 09 20 RT MBU SRC 09 20 CC..09T3.. 20 18.3 7.2 37.1 RTMS20 M3.5 T15/T10 RTS20
9 RT MBU SLT 09 20 RT MBU SRT 09 20 TC..0902.. 20 18.3 6.3 37.1 RTMS20 M2.2 T7/T10 RTS20
10 RT MBU SLTP 09 20 RT MBU SRTP 09 20 TP..0902.. 20 18.3 6.3 37.1 RTMS20 M2.5 T8/T10 RTS20
11 RT MBU SLD 07 20 RT MBU SRD 07 20 DC..0702.. 20 18.3 6.3 37.1 RTMS20 M2.5 T8/T10 RTS20
12 RT MBU SLC 09 22 RT MBU SRC 09 22 CC..09T3.. 22 22.1 7.2 49.1 RTMS22 M3.5 T15 RTS22
13 RT MBU SLT 1102 22 RT MBU SRT 1102 22 TC..1102.. 22 22.1 7.2 49.1 RTMS22 M2.5 T8/T15 RTS22
14 RT MBU SLT 1103 22 RT MBU SRT 1103 22 TC..1103.. 22 22.1 7.2 49.1 RTMS22 M2.5 T8/T15 RTS22
15 RT MBU SLTP 11 22 RT MBU SRTP 11 22 TP..1103.. 22 22.1 7.2 49.1 RTMS22 M3.0 T10/T15 RTS22
16 RT MBU SLD 07 22 RT MBU SRD 07 22 DC..0702.. 22 22.1 7.2 49.1 RTMS22 M2.5 T8/T15 RTS22
17 RT MBU SLC 12 32 RT MBU SRC 12 32 CC..1204.. 32 32 10.3 69.6 RTMS32 M4.5 T20/3MM RTS32
18 RT MBU SLT 16 32 RT MBU SRT 16 32 TC..16T3.. 32 32 10.3 69.6 RTMS32 M3.5 T15/3MM RTS32
19 RT MBU SLTP 16T3 32 RT MBU SRTP 16T3 32 TP..16T3.. 32 32 10.3 69.6 RTMS32 M3.5 T15/3MM RTS32
20 RT MBU SLTP 1604 32 RT MBU SRTP 1604 32 TP..1604.. 32 32 10.3 69.6 RTMS32 M4.0 T15/3MM RTS32

Customized Micro Bore Units

  • Customized Micro Bore Unit designed and manufactured at Renuka Tools® for grooving application.
  • Customized boring bar also designed and manufactured at Renuka Tools ® for this special application.

ID Boring Application using Micro Bore Units

  • Customized Micro Bore Unit designed and manufactured at Renuka Tools® for grooving application.
  • Customized boring bar also designed and manufactured at Renuka Tools ® for this special application.

Mounting Dimensions for Micro Bore Units

Specification Chart

Detail Sr.No. DbH7 d1 d2 d3 h3 h4 h5 Th hc T
A 1 14.0 16.0 3.7 2.7 9.3 2.8 1.2 8.0 8.65 ±0.02 M2.5
2 16.0 19.0 4.6 3.2 11.5 2.8 1.6 9.0 9.65 ±0.02 M3.0
3 20.0 25.0 4.6 3.2 15.5 4.0 1.6 9.0 12.50 ±0.05 M3.0
4 22.0 30.0 6.5 4.3 24.0 5.0 1.8 13.0 15.40 ±0.05 M4.0
B 5 32.0 46.0 11.9 5.4 33.0 6.3 - 16.0 23.00 ±0.05 M5.0
  • Position of the mounting holes mentioned above are for LH cutting Hand. For RH cutting hand, they will be mirrored.
  • Mounting details mentioned in the above table depend on the bush diameter (Db) of the Micro Bore Unit.
  • Please refer to the tables in the tabs of 'Angular Mounting Type' and 'Straight Mounting Type' to find the Bush Diameter (Db) of yours selected Micro Bore Unit.

FBU – Angular Mounting Type

Specification Chart – For Angular Mounting:

Sr.No Db RT MBU ITEM CODE INSERTS D min D2 Bmin h1max Smin S1mean -ve range (radial) +ve range (radial)
LH RH
1 11.11 RT FBU ALT 06T1 11 RT FBU ART 06T1 11 TC..06T104 19 17 0.84 1 8.6 8.8 0.16 0.84
2 11.11 RT FBU ALT 0601 11 RT FBU ART 0601 11 TC..06T104 19 17 0.84 1 8.6 8.8 0.16 0.84
3 15.08 RT FBU ALC 06 15 RT FBU ARC 06 15 CC..060204 25 23 0.678 1.1 11.325 11.7 0.3 0.8
4 15.08 RT FBU ALT 09 15 RT FBU ART 09 15 TC..090204 25 23 0.678 1.1 11.325 11.7 0.3 0.8
5 15.08 RT FBU ALTP 09 15 RT FBU ARTP 09 15 TP..090204 25 23 0.678 1.1 11.325 11.7 0.3 0.8
6 19.05 RT FBU ALC 09 19 RT FBU ARC 09 19 CC..09T304; 36 34 0.598 1.7 14.4 14.9 0.4 1.3
7 19.05 RT FBU ALT 1102 19 RT FBU ART 1102 19 TC..110204 36 34 0.598 1.7 14.4 14.9 0.4 1.3
8 19.05 RT FBU ALT 1103 19 RT FBU ART 1103 19 TC..110304 36 34 0.598 1.7 14.4 14.9 0.4 1.3
9 19.05 RT FBU ALTP 11 19 RT FBU ARTP 11 19 TP..110304 36 34 0.598 1.7 14.4 14.9 0.4 1.3
10 19.05 RT FBU ALTN 11 19 RT FBU ARTN 11 19 TP..110304 36 34 0.598 1.7 14.4 14.9 0.4 1.3
11 19.05 RT FBU ALD 07 19 RT FBU ARD 07 19 DC..070204 36 34 0.598 1.7 14.4 14.9 0.4 1.3
12 22.225 RT FBU ALC 09 222 RT FBU ARC 09 222 CC..09T304 47 44 1.098 2.7 17.6 18.35 0.6 2.1
13 22.225 RT FBU ALT 1102 222 RT FBU ART 1102 222 TC..110204 47 44 1.098 2.7 17.6 18.35 0.6 2.1
14 22.225 RT FBU ALT 1103 222 RT FBU ART 1103 222 TC..110304 47 44 1.098 2.7 17.6 18.35 0.6 2.1
15 22.225 RT FBU ALTP 11 222 RT FBU ARTP 11 222 TP..110304 47 44 1.098 2.7 17.6 18.35 0.6 2.1
16 22.225 RT FBU ALTN 11 222 RT FBU ARTN 11 222 TP..110304 47 44 1.098 2.7 17.6 18.35 0.6 2.1
17 22.225 RT FBU ALD 07 222 RT FBU ARD 07 222 DC..070204 47 44 1.098 2.7 17.6 18.35 0.6 2.1
18 31.75 RT FBU ALC 12 31 RT FBU ARC 12 31 CC..120404 73 70 0.776 4.2 27.125 28 0.7 3.5
19 31.75 RT FBU ALT 16 31 RT FBU ART 16 31 TC..16T304 73 70 0.776 4.2 27.125 28 0.7 3.5
20 31.75 RT FBU ALTP 16T3 31 RT FBU ARTP 16T3 31 TP..16T304 73 70 0.776 4.2 27.125 28 0.7 3.5
21 31.75 RT FBU ALTP 1604 31 RT FBU ARTP 1604 31 TP..160404 73 70 0.776 4.2 27.125 28 0.7 3.5
22 31.75 RT FBU ALTN 16 31 RT FBU ARTN 16 31 TN..160404 73 70 0.776 4.2 27.125 28 0.7 3.5

FBU – Straight Mounting Type

Specification Chart – For Straight Mounting:

Sr.No Db RT MBU ITEM CODE INSERTS D min D2 Bmin h1max Smin S1mean -ve range (radial) +ve range (radial)
LH RH
1 11.11 RT FBU SLT 06T1 11 RT FBU SRT 06T1 11 TC..06T104 19 17 0.8 1.2 7.2 7.4 0.2 1
2 11.11 RT FBU SLT 0601 11 RT FBU SRT 0601 11 TC..06T104 19 17 0.8 1.2 7.2 7.2 0.2 1
3 15.08 RT FBU SLC 06 15 RT FBU SRC 06 15 CC..060204 25 23 0.7 1.5 10.5 10.8 0.3 1.2
4 15.08 RT FBU SLT 09 15 RT FBU SRT 09 15 TC..090204 25 23 0.7 1.5 10.5 10.8 0.3 1.2
5 15.08 RT FBU SLTP 09 15 RT FBU SRTP 09 15 TP..090204 25 23 0.7 1.5 10.5 10.8 0.3 1.2
6 19.05 RT FBU SLC 09 19 RT FBU SRC 09 19 CC..09T304; 36 34 0.4 2.4 13.2 13.8 0.6 1.8
7 19.05 RT FBU SLT 1102 19 RT FBU SRT 1102 19 TC..110204 36 34 0.4 2.4 13.2 13.8 0.6 1.8
8 19.05 RT FBU SLT 1103 19 RT FBU SRT 1103 19 TC..110304 36 34 0.4 2.4 13.2 13.8 0.6 1.8
9 19.05 RT FBU SLTP 11 19 RT FBU SRTP 11 19 TP..110304 36 34 0.4 2.4 13.2 13.8 0.6 1.8
10 19.05 RT FBU SLTN 11 19 RT FBU SRTN 11 19 TP..110304 36 34 0.598 1.7 14.4 14.9 0.4 1.3
11 19.05 RT FBU SLD 07 19 RT FBU SRD 07 19 DC..070204 36 34 0.4 2.4 13.2 13.8 0.6 1.8
12 22.225 RT FBU SLC 09 222 RT FBU SRC 09 222 CC..09T304 47 44 0.8 3.6 16 16.7 0.7 2.9
13 22.225 RT FBU SLT 1102 222 RT FBU SRT 1102 222 TC..110204 47 44 0.8 3.6 16 16.7 0.7 2.9
14 22.225 RT FBU SLT 1103 222 RT FBU SRT 1103 222 TC..110304 47 44 0.8 3.6 16 16.7 0.7 2.9
15 22.225 RT FBU SLTP 11 222 RT FBU SRTP 11 222 TP..110304 47 44 0.8 3.6 16 16.7 0.7 2.9
16 22.225 RT FBU SLTN 11 222 RT FBU SRTN 11 222 TP..110304 47 44 0.8 3.6 16 16.7 0.7 2.9
17 22.225 RT FBU SLD 07 222 RT FBU SRD 07 222 DC..070204 47 44 0.8 3.6 16 16.7 0.7 2.9
18 31.75 RT FBU SLC 12 31 RT FBU SRC 12 31 CC..120404 73 70 0.5 5.6 24 25 1 4.6
19 31.75 RT FBU SLT 16 31 RT FBU SRT 16 31 TC..16T304 73 70 0.5 5.6 24 25 1 4.6
20 31.75 RT FBU SLTP 16T3 31 RT FBU SRTP 16T3 31 TP..16T304 73 70 0.5 5.6 24 25 1 4.6
21 31.75 RT FBU SLTP 1604 31 RT FBU SRTP 1604 31 TP..160404 73 70 0.5 5.6 24 25 1 4.6
22 31.75 RT FBU SLTN 16 31 RT FBU SRTN 16 31 TN..160404 73 70 0.5 5.6 24 25 1 4.6

Operating Instructions

Notes

  • Mount the Fine Boring Unit properly in the finish boring tool supplied by Renuka Tools. This can be easily done by simply tightening the mounting screws in a proper manner (Pic.1). In case the tool is of any other brand ensure that the manufacturer adheres to the mounting instructions provided by Renuka Tools. Else, it might result in non-efficient working or even tool failure.
  • Set the required diameter before clamping the tool on the machine, ideally on a tool pre-setter, or else with the help of a precise dial indicator (Pic.2). During this setting, ensure that any one scale marking on the FBU inner scale coincides exactly with the extreme end marking on the outer vernier scale. This will automatically match some other inner scale marking with the other extreme end of the outer vernier scale (Pic.3). This will help the user to quickly adjust after initial trial of tool.
  • See if the desired results are obtained by running the tool on the machine. In case of any deviation in the desired results, kindly use the spanner for adjustment. For increasing the diameter, rotate in clockwise direction and for decreasing, rotate in counter-clockwise direction. One entire division movement of the inner FBU scale will give you 20 microns on diameter (i.e., 10 microns radially). Now use the vernier scale for adjustment. If the diameter reading has to be increased, kindly match the adjacent marking (of left side) with the nearest vernier scale marking. This will result in increase of 2 microns on the diameter (i.e., 1 micron radially) (Pic 3.1 - Zoomed). For reduction of diameter, follow the same procedure in the opposite direction (Pic 3.2 - Zoomed).
  • Maximum diameter adjustment can be checked from the rear end of the spanner (Pic.4). Do not exceed the maximum limit as it may cause permanent damage to the unit.

Precautionary Measures

  • Due to constraints in the assembly tolerances, it is recommended that units, if damaged, are returned to Renuka Tools for assessment/repair in a controlled environment. Commercials for repair can only be determined after detailed assessment of the damaged unit.
  • Renuka Tools Micro Bore Unit cannot be adjusted beyond its range and the maximum range can be checked from the thickness of the end portion of the spanner provided along with the unit. Exceeding the range might result in permanent damage to the unit.
  • Kindly change the mounting screws and insert screws ahead in time to avoid accidents.
  • In case of any observed decrease in accuracy over the time of usage, kindly request Renuka Tools for servicing the unit.
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