1. Trinity Mexico Boring Bar Repair Report
CM&ES
BAR #18002

2. Initial Bar Inspection Upon Receipt
Trinity Mexico Visual Inspection Results:
WB90 Boring Mill -physically bar appears in good shape
Automatic Boring Bar # drive gear teeth stretched / spins and
Repair (questionable if warranty) cogs / not smooth / flange ok
Received 6/11/18
Note: last rebuild of this bar 1/22/18 (COMPLETE only shell reused)

3. * Flange Removal Procedure : Verified stepper / servo mount (OK)
Checked Pilot size (OK)
Checked key depth (ok )
Checked Flange (good)
Removed bolts
Removed Flange
Sent flange for inspection

4. Internal Inspection Bearing block on Rougher (bulged)
Bearings on Rougher (crunchy /crashed)
Bearing block on Finisher (fair)
Bearings on Finisher( ok)
Bearing block on Chamfer (ok)
Bearings on Chamfer (ok)
Rougher Screw (.016 run out)
Threads (show no wear on ends)
Finisher Screw (.005 run out)
Threads (show no wear on ends )
Chamfer Screw (.0.01 runout)
Threads (show no wear on end)

5. Internal Inspection Continued
Drive Gear / Drive Gear Pin (strained)
Drive Shaft (badly bent ) .243 runout
Drive Shaft Bearing Spacer:
Rough (fair)
Finish (ok)
Chamfer (ok)
Worm Gears / Worm Gear Pin:
Rough (strained)
Finish (ok)
Chamfer (ok)
Drive Shaft Bearings:
Rough (fair)
Drive Shaft Bearing Block
Rough (ok)

6. Rebuild All Tool Pockets checked and good New Components Installed:
- Top Half
Drive shaft
Drive Worms
Drive Shaft Spacers
Drive Shaft Bearings
Drive Shaft Bearing Blocks
Drive Shaft Gear
-Bottom Half
Rougher Bearing Block
Tool Adjusting Screws
Drive Gears
Bearings
Bearing Spacers
Greased / re-assembled / Flange seated

7. Completion 06/15/18
Flange Re-trued in lathe Cleaned / polished OD of bar Installed new Nylock Gib Adjusting Screws Test Tooling installed and run Greased Drive Gear / and lightly greased OD of Bar Packed Tool Pockets and Drive Gear pilot with paper for shipping Set on Pallet and Ready for shipment Determination of Non-warranty: bar had all new components when rebuilt 1/22/18 - the driveshaft was bent and gears strained Damage of this type could possibly be from: incorrect loading of tools servo current set too high and bottoming 1 tool while loading moving tools out while in bore of wheel