Products
Fine Bore Units – FBU
Fine Bore Units
include/img/Fine Bore Units – FBU/Introduction/fine_bore_units_big.jpg
Facts & Advantages
  •   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.
Nomenclature Code Key for Ordering FBU
include/img/Fine Bore Units – FBU/Nomenclature/FBUbig1.jpg
Nomenclature Code Key for Ordering Fine Boring Bar with FBU
include/img/Fine Bore Units – FBU/Nomenclature/FBUbig2.jpg
FBU - Angular Mounting Type
include/img/Fine Bore Units – FBU/Angular Mounting Type/angular_mounting_type_big1.jpg
include/img/Fine Bore Units – FBU/Angular Mounting Type/angular_mounting_type_big2.jpg
include/img/Fine Bore Units – FBU/Angular Mounting Type/angular_mounting_type_big3.jpg
include/img/Fine Bore Units – FBU/Angular Mounting Type/angular_mounting_type_big4.jpg
Specification Chart
All Left-Hand variants shown above.
All dimensions are in mm.
Sr. No Item Code Insert Db L1 F1 Dmin Mounting
Screw 		Insert
Screw 		Torx/Allen
key 		Spanner
LH RH
1 RT FBU ALT 06T1 11 RT FBU ART 06T1 11 TC..06T1.. 11.11 11.7 1.11 19 RTMS11 M2.0 T6/1.5MM RTS11
2 RT FBU ALT 0601 11 RT FBU ART 0601 11 TC..0601.. 11.11 11.7 1.11 19 RTMS11 M2.0 T6/1.5MM RTS11
3 RT FBU ALC 06 15 RT FBU ARC 06 15 CC..0602.. 15.08 14.0 0.46 25 RTMS15 M2.5 T8/2.0MM RTS15
4 RT FBU ALT 09 15 RT FBU ART 09 15 TC..0902.. 15.08 14.0 0.46 25 RTMS15 M2.2 T7/2.0MM RTS15
5 RT FBU ALTP 09 15 RT FBU ARTP 09 15 TP..0902.. 15.08 14.0 0.46 25 RTMS15 M2.5 T8/2.0MM RTS15
6 RT FBU ALC 09 19 RT FBU ARC 09 19 TC..1102.. 19.05 18.9 0.7 36 RTMS19 M3.5 T15/2.0MM RTS19
7 RT FBU ALT 1102 19 RT FBU ART 1102 19 TC..1102.. 19.05 18.9 0.7 36 RTMS19 M2.5 T8/2.0MM RTS19
8 RT FBU ALT 1103 19 RT FBU ART 1103 19 TC..1103.. 19.05 18.9 0.7 36 RTMS19 M2.5 T8/2.0MM RTS19
9 RT FBU ALTP 11 19 RT FBU ARTP 11 19 TP..1103.. 19.05 18.9 0.7 36 RTMS19 M3.0 T10/2.0MM RTS19
10 RT FBU ALTN 11 19 RT FBU ARTN 11 19 TN..1103.. 19.05 18.9 0.7 36 RTMS19 * 2.5MM/2.0MM RTS19
11 RT FBU ALD 07 19 RT FBU ARD 07 19 DC..0702.. 19.05 18.9 2.3 36 RTMS19 M2.5 T8/2.0MM RTS19
12 RT FBU ALC 09 222 RT FBU ARC 09 222 CC..09T3.. 22.225 23.15 0.8 47 RTMS222 M3.5 T15/2.0MM RTS222
13 RT FBU ALT 1102 222 RT FBU ART 1102 222 TC..1102.. 22.225 23.15 0.54 47 RTMS222 M2.5 T8/2MM RTS222
14 RT FBU ALT 1103 222 RT FBU ART 1103 222 TC..1103.. 22.225 23.15 0.54 47 RTMS222 M2.5 T10/2.0MM RTS222
15 RT FBU ALTP 11 222 RT FBU ARTP 11 222 TP..1103.. 22.225 23.15 0.54 47 RTMS222 M3.0 T10/2MM RTS222
16 RT FBU ALTN 11 222 RT FBU ARTN 11 222 TN..1103.. 22.225 23.15 0.54 47 RTMS222 * 2.5MM/2.0MM RTS222
17 RT FBU ALD 07 222 RT FBU ARD 07 222 DC..0702.. 22.225 23.15 2.3 47 RTMS222 M2.5 T8/2.0MM RTS222
18 RT FBU ALC 12 31 RT FBU ARC 12 31 CC..1204.. 31.75 34.4 0.86 73 RTMS31 M4.5 T20/3.0MM RTS31
19 RT FBU ALT 16 31 RT FBU ART 16 31 TC..16T3.. 31.75 34.4 0.86 73 RTMS31 M3.5 T15/3.0MM RTS31
20 RT FBU ALTP 16T3 31 RT FBU ARTP 16T3 31 TP..16T3.. 31.75 34.4 0.86 73 RTMS31 M3.5 T15/3.0MM RTS31
21 RT FBU ALTP 1604 31 RT FBU ARTP 1604 31 TP..1604.. 31.75 34.4 0.86 73 RTMS31 M4.0 T15/3.0MM RTS31
22 RT FBU ALTN 16 31 RT FBU ARTN 16 31 TN..1604.. 31.75 34.4 0.86 73 RTMS31 * 3.5MM/3.0MM RTS31
Additional Spare Details for TN..inserts
All dimensions are in mm.
Sr. No Insert Lever Lever Screw Shim Shim Pin Allen Key
1 TN..1103 TNL11 TNLS11 TNS11 TNSP11 2.5MM
2 TN..1604 TNL16 TNLS16 TNS16 TNSP16 3.5MM
Notes
  •   Fine Boring Units are delivered with all required spares such as insert screw, mounting screws, spanner, torx keys & allen keys.
  •   Inserts are not included with Fine Boring 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.
  •   FBU variants with DC..0702.. inserts are especially designed for close tolerance undercut applications.
  •   Maximum recommended material removal is 0.5mm diametrically.
  •   Customized FBU for special requirements can also be provided but will be made to order with a lead time of 3-6 weeks.
FBU - Straight Mounting Type
include/img/Fine Bore Units – FBU/Straight Mounting Type/straight_mounting_type_big1.jpg
include/img/Fine Bore Units – FBU/Straight Mounting Type/straight_mounting_type_big2.jpg
include/img/Fine Bore Units – FBU/Straight Mounting Type/straight_mounting_type_big3.jpg
include/img/Fine Bore Units – FBU/Straight Mounting Type/straight_mounting_type_big4.jpg
Specification Chart
All Left-Hand variants shown above.
All dimensions are in mm.
Sr. No Item Code Insert Db L1 F1 Dmin Mounting
Screw 		Insert
Screw 		Torx/Allen
key 		Spanner
LH RH
1 RT FBU SLT 06T1 11 RT FBU SRT 06T1 11 TC..06T1.. 11.11 10.3 2.6 19 RTMS11 M2.0 T6/1.5MM RTS11
2 RT FBU SLT 0601 11 RT FBU SRT 0601 11 TC..0601.. 11.11 10.3 2.6 19 RTMS11 M2.0 T6/1.5MM RTS11
3 RT FBU SLC 06 15 RT FBU SRC 06 15 CC..0602.. 15.08 14 3.6 25 RTMS15 M2.5 T8/2.0MM RTS15
4 RT FBU SLT 09 15 RT FBU SRT 09 15 TC..0902.. 15.08 14.9 3.6 25 RTMS15 M2.2 T7/2.0MM RTS15
5 RT FBU SLTP 09 15 RT FBU SRTP 09 15 TP..0902.. 15.08 14.9 3.6 25 RTMS15 M2.5 T8/2.0MM RTS15
6 RT FBU SLC 09 19 RT FBU SRC 09 19 CC..09T3.. 19.05 14.9 4 36 RTMS19 M3.5 T15/2.0MM RTS19
7 RT FBU SLT 1102 19 RT FBU SRT 1102 19 TC..1102.. 19.05 17.8 4 36 RTMS19 M2.5 T8/2.0MM RTS19
8 RT FBU SLT 1103 19 RT FBU SRT 1103 19 TC..1103.. 19.05 17.8 4 36 RTMS19 M2.5 T8/2.0MM RTS19
9 RT FBU SLTP 11 19 RT FBU SRTP 11 19 TP..1103.. 19.05 17.8 4 36 RTMS19 M3.0 T10/2.0MM RTS19
10 RT FBU SLTN 11 19 RT FBU SRTN 11 19 TN..1103.. 19.05 17.8 4 36 RTMS19 * 2.5MM/2.0MM RTS19
11 RT FBU SLD 07 19 RT FBU SRD 07 19 DC..0702.. 19.05 17.8 4 36 RTMS19 M2.5 T8/2.0MM RTS19
12 RT FBU SLC 09 222 RT FBU SRC 09 222 CC..09T3.. 22.225 21.5 4.8 47 RTMS222 M3.5 T15/2.0MM RTS222
13 RT FBU SLT 1102 222 RT FBU SRT 1102 222 TC..1102.. 22.225 21.5 4.8 47 RTMS222 M2.5 T8/2MM RTS222
14 RT FBU SLT 1103 222 RT FBU SRT 1103 222 TC..1103.. 22.225 21.5 4.8 47 RTMS222 M2.5 T10/2.0MM RTS222
15 RT FBU SLTP 11 222 RT FBU ARTP 11 222 TP..1103.. 22.225 21.5 4.8 47 RTMS222 M3.0 T10/2MM RTS222
16 RT FBU SLTN 11 222 RT FBU SRTN 11 222 TN..1103.. 22.225 21.5 4.8 47 RTMS222 * 2.5MM/2.0MM RTS222
17 RT FBU SLD 07 222 RT FBU SRD 07 222 DC..0702.. 22.225 21.5 4.8 47 RTMS222 M2.5 T8/2.0MM RTS222
18 RT FBU SLC 12 31 RT FBU SRC 12 31 CC..1204.. 31.75 31.4 7.1 73 RTMS31 M4.5 T20/3.0MM RTS31
19 RT FBU SLT 16 31 RT FBU SRT 16 31 TC..16T3.. 31.75 31.4 7.1 73 RTMS31 M3.5 T15/3.0MM RTS31
20 RT FBU SLTP 16T3 31 RT FBU SRTP 16T3 31 TP..16T3.. 31.75 31.4 7.1 73 RTMS31 M3.5 T15/3.0MM RTS31
21 RT FBU SLTP 1604 31 RT FBU SRTP 1604 31 TP..1604.. 31.75 31.4 7.1 73 RTMS31 M4.0 T15/3.0MM RTS31
22 RT FBU SLTN 16 31 RT FBU SRTN 16 31 TN..1604.. 31.75 31.4 7.1 73 RTMS31 * 3.5MM/3.0MM RTS31
Additional Spare Details for TN..inserts
All dimensions are in mm.
Sr. No Insert Lever Lever Screw Shim Shim Pin Allen Key
1 TN..1103 TNL11 TNLS11 TNS11 TNSP11 2.5MM
2 TN..1604 TNL16 TNLS16 TNS16 TNSP16 3.5MM
Notes
  •   Fine Boring Units are delivered with all required spares such as insert screw, mounting screws, spanner, torx keys & allen keys.
  •   Inserts are not included with Fine Boring 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.
  •   FBU variants with DC..0702.. inserts are especially designed for close tolerance undercut applications.
  •   Maximum recommended material removal is 0.5mm diametrically.
  •   Customized FBU for special requirements can also be provided but will be made to order with a lead time of 3-6 weeks.
Customized Fine Boring Units
  •   Customized Fine Boring Unit designed and manufactured at Renuka Tools for grooving application.
  •   Customized boring bar also designed and manufactured at Renuka Tools for this special application.
include/img/Fine Bore Units – FBU/Customized Fine Boring Units/Customized FBU Big.jpg
Illustrative Applications of Fine Boring using Fine Boring Units
ID Boring Application using Fine Boring Units
include/img/Fine Bore Units – FBU/ID Boring/application_id_boring_big1.jpg
include/img/Fine Bore Units – FBU/ID Boring/application_id_boring_big2.jpg
Notes
  •   Minimum Diameter ØD = Ø19.0mm
  •   Standard range of Fine Boring Tools for ID boring application are available from Renuka Tools.  Click here  to know more.
OD Turning & Undercut Machining Application using Fine Boring Units
include/img/Fine Bore Units – FBU/OD Turning & Undercut/application_od_turning_and_undercut_big1.jpg
include/img/Fine Bore Units – FBU/OD Turning & Undercut/application_od_turning_and_undercut_big2.jpg
Notes
  •   Minimum Diameter ØD = Ø12.0mm
  •   Fine Boring Tools for OD Turning & Undercut Machining application will be tailor made as per requirements.
  •   Lead time of 2-3 weeks.
Back Boring Application using Fine Boring Units
include/img/Fine Bore Units – FBU/Back Boring/application_back_boring_big1.jpg
include/img/Fine Bore Units – FBU/Back Boring/application_back_boring_big2.jpg
Notes
  •   Minimum Diameter ØD = Ø19.0mm
  •   Fine Boring Tools for Back Boring application will be tailor made as per requirements.
  •   Lead time of 2-3 weeks.
ID Boring & Undercut Machining Application using Fine Boring Units
include/img/Fine Bore Units – FBU/ID Boring & Undercut/application_id_boring_and_undercut_big1.jpg
include/img/Fine Bore Units – FBU/ID Boring & Undercut/application_id_boring_and_undercut_big2.jpg
Notes
  •   Minimum Diameter ØD = Ø36.0mm
  •   Fine Boring Tools for ID Boring & Undercut Machining application will be tailor made as per requirements.
  •   Lead time of 2-3 weeks.
Mounting Dimensions for Fine Boring Units
include/img/Fine Bore Units – FBU/Mounting Dimensions/mounting_dimmensions_for_fbu_big.jpg
Specification Chart – For Angular Mounting:
All dimensions are in mm.
Fig. Sr.No Db H7 d1 d2 d3 h2 h3 h4 θ° Th hc T
Fig.1 1 11.11 15.06 3.5 2.4 11.1 2.7 1.58 45 6 8.00±0.02 M2.0
Fig.2 2 15.08 19.05 4.65 3.3 12.4 3.2 1.15 49 8 9.58±0.02 M3.0
Fig.3 3 19.05 24.58 5.7 3.5 18.7 4 1.3 49 11 12.29±0.05 M3.0
4 22.225 31.75 7.2 3.8 24.8 4.8 1.1 49 13 15.88±0.05 M3.5
5 31.75 46.02 9.55 5.4 37.8 6.4 1.15 49 17 23.01±0.05 M5.0
Specification Chart – For Straight Mounting:
All dimensions are in mm.
Fig. Sr.No Db H7 d1 d2 d3 h2 h3 h4 θ° Th hc T
Fig.4 1 11.11 15.06 3.5 2.4 11.1 2.7 1.58 45 6 8.00±0.02 M2.0
2 15.08 19.05 5.8 3.2 12.4 3.2 1.15 49 8 10.30±0.02 M3.0
3 19.05 24.58 5.7 3.5 18.7 4 1.3 49 11 12.29±0.05 M3.0
4 22.225 31.75 7.2 3.8 24.8 4.8 1.1 49 13 15.88±0.05 M3.5
5 31.75 46.02 9.55 5.4 37.8 6.4 1.15 49 17 23.01±0.05 M5.0
Notes
  •   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 Fine Boring Unit.
  •   Please refer to tables on “Angular Mounting Type” & “Straight Mounting Type” tabs to find the Bush Diameter (Db) of your selected Fine Boring Unit.
FBU – Angular Mounting Type
include/img/Fine Bore Units – FBU/Working Dimensions/working_dimensions_for_fbu_big1.jpg
Specification Chart – For Angular Mounting:
All dimensions are in mm.
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 TN..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
include/img/Fine Bore Units – FBU/Working Dimensions/working_dimensions_for_fbu_big2.jpg
Specification Chart – For Straight Mounting:
All dimensions are in mm.
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 7.4 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 TN..110304 36 34 0.4 2.4 13.2 13.8 0.6 1.8
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
  •   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.
include/img/Fine Bore Units – FBU/Operating Instructions/pic1_big.jpg
  •   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.
include/img/Fine Bore Units – FBU/Operating Instructions/pic2_big.jpg
  •   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).
include/img/Fine Bore Units – FBU/Operating Instructions/pic3_big.jpg
  •   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.
include/img/Fine Bore Units – FBU/Operating Instructions/pic4_big.jpg
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’ Fine Boring 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.