These fine-finishing boring units are designed for building into boring bars which are dedicated to (or about) a specific bore size.

The units are pre-tensioned which eliminates backlash and adjustment is made from the front only.

Features:

  • Unique Design incorporating a precision ground collet
  • Split collet clamps to ACME type thread for accuracy and strength
  • Separate graduated dial seated on top face of hole
  • Rigidity maintained throughout full adjustment of unit
Benefits:

  • No deflection under load on eneven or intermittent cutting
  • Greater repeatability
  • Longer Insert Life
  • Most positive direct adjustment, high degree of rigidity, no dial slip when adjusting
Each graduation on the adjusting dial = 0.005 mm / 0.0002 in. adjustment on radius.
Each vernier graduation on the bush = 0.001 mm / 0.00004 in. adjustment on radius.
Size Order Code M-dia min R-adj range H-min ht K-tool offset point Insert Datum Rad
mm inch mm inch mm inch mm inch mm inch
1 MBU 1-980-290C06 24.9 .980 0.52 .020 12.9 .508 0.4 .016 CC__06 02__ 0.4 .016
MBU 1-980-590C06 27.9 1.098 0.65 .026 11.0 .433 5.1 .201
MBU 1-980-590-LH
2 MBU 2-970-290C06 31.0 1.220 0.8 .031 14.9 .587 1.0 .039
MBU 2-970-590C06
MBU 2-970-590-LH 37.0 1.457 1.0 .039 14.0 .551 6.3 .248
3 MBU 3-960-290T11 40.5 1.594 1.2 .047 17.6 .693 1.1 .043 TC__11 02__
MBU 3-960-590T11 48.5 1.909 1.5 .059 16.8 .661 7.2 .283
MBU 3-960-590-LH
4 MBU 4-950-290T16 59.5 2.343 2.0 .079 26.5 1.043 1.4 .055 TC__16 T3__ 0.8 .031
MBU 4-950-590T16 69.0 2.717 2.5 .098 25.4 1.000 10.5 .413
MBU 4-950-590-LH
Dimension Tolerance MBU1
MBTR/SAB1
MBU2
MBTR/SAB2
MBU3
MBTR/SAB3
MBU4
MBTR/SAB4
mm inch mm inch mm inch mm inch mm inch
A
+0.2
-0
+.008
-0
19.0 .7480 25.0 .9843 30.0 1.1811 46.0 1.8110
B H7
16.0 .6299 20.0 .7874 22.0 .8661 32.0 1.2598
b1 Drill point min 14.50 .571 18.50 .728 20.50 .807 30.50 1.200
C +0.2
-0
+.008
-0
12.50 .492 15.50 .610 24.00 .945 36.00 1.417
D +/-0.05 +/-.002 3.70 .146 4.00 .157 5.00 .197 6.30 .248
E 9.65 .380 12.5 .492 15.4 .606 23.0 .906
F
+0.1
-0
+.004
-0
4.6 .181 4.6 .181 6.5 .256 11.6 .457
G 2.5 .098 1.6 .063 1.8 .071 0 0
H
3.2 .126 3.2 .126 4.3 .169 5.4 .213
J M3X0.5 M3X0.5 M4X0.7 M5X0.8
K 10.0 .393 9.0 .354 13.0 .512 16.0 .630
Product Code Insert Screw Retaining Screws & Wrench Kit Adjusting Spanner Insert Screw Key Insert Screw Driver
MBU 1-980-290C06 RS2560 BTR-001/10/3 R36 R37 R37D
MBU 1-980-590C06
MBU 1-980-590-LH
MBU 2-970-290C06 R46
MBU 2-970-590C06
MBU 2-970-590-LH
MBU 3-960-290T11 BTR-001/7/3 R36
MBU 3-960-590T11
MBU 3-960-590-LH
MBU 4-950-290T16 RS4084 BTR-011/8/3 R76 R77 R77D
MBU 4-950-590T16
MBU 4-950-590-LH

Rigibore Ltd | The Most Accurately Adjustable Boring Tools In The World

Company Number 01465509. Registered in England and Wales. VAT registration number GB 168268668

2017 Rigibore Ltd - Other companies in the Bassett group