Attachment_0002_-_Original_Tolerance_Requirements.docx
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Attachment 0002 -- Original Equipment Tolerance Requirements
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Attachment 0002 – Original Tolerance Requirements for World Machine Works BP 150 Horizontal Boring Mill at Red River Army Depot (RRAD)
RRAD’s World Machine Works BP 150 Horizontal Boring Machine was designed to meet or exceed the following specifications:
TABLE I
Size and Capacity
Spindle:
| Diameter | 5.9 in, (150mm) |
| Spindle nose taper | ANSI B5.50 #50 |
| Feed stroke {"Z" Axis) | 39.37in (1000mm Minimum) | |||
| Range of feeds - infinitely variable | .0004 in/rev to 787 IPM (0.010 – 20m/min) | |||
| Rapid traverse | 200 IPM | |||
| Drive motor | 49Hp | |||
| Speed range - infinitely variable | 10-2500 RPM | |||
| Constant horsepower | 190-2200 RPM |
Milling/boring feeds; W Axis· Range of feeds - infinitely variable .0004 in/rev to 787 IPM (0.010 - 20mimin) Rapid traverse 787 IPM(20m/min)
Column:
Vertical spindle head travel (Y-axis) 108" minimum
Column runway:
Longitudinal column travel (X-axis) 393.7 in (l0m)
Column Ram travel:
Horizontal column cross travel (W-axis) 47.2 in to 59.1 in (1200mm to 1500mm)
Note: Horizontal column cross travel (W-axis) can be accomplished by the use of a collinear ram in addition to the live spindle or a movable column type machine configuration.
TABLE II
Alignment Accuracy
Characteristic Requirement
Spindle Axial Runout Sleeve 0.0003''TlR
Spindle Sleeve Radial/Axial:
| From Spindle Nose | 0.0005"TIR | |
| 10” From Spindle Nose | 0.0010"TIR | |
| Spindle Taper Runout at 1.2” | 0.0007” | |
| Spindle Taper Runout at 10” | 0.0010” |
Spindle Centerline to X and Y Axes 0.0005”/ft.
Linear Axes Travel Sq, to Each Other 0.003”/ft.
Key Slots/Edge Locators Parallel with Longitudinal Axis Movement 0.0005”/ft.
Worktable/Pallet Working Surface Parallel With X & Y Plane Checked at a Point 8” From Center of Rotation at 4 Positions 0.0010”TIR
Worktable Working Surface Rise-Fall Checked over Full Travel 0.0010”/ft.
Accuracies per ISO 230-2-1997:
| W-X-Y Axis Positioning Accuracy | ±0.0006” | |||
| W-X~Y Axes Repeatability | ±0.0003” | |||
| Rotary C-Axis Positioning Accuracy | ±10 Arc Seconds | |||
| Rotary C-Axis Repeatability | ±5 Arc Seconds | |||
| Angular A-Axis Positioning Accuracy | ±10 Arc Seconds | |||
| Angular A-Axis Repeatability | ±5 Arc Seconds | |||
| Z Axis Positioning | 0.0016” | |||
| Z Axis Repeatability | 0.0010” | |||
| Axis Overshoot (at 20% of maximum feed rate) | 0.003” | |||
| Maximum Axis Overshoot | 0.005” |
Table III Performance accuracy
Machining operation Accuracy
Drilling Depth of hole ±0.005”
Tapping Threaded holes shall be Class III in accordance with FED-STD-H28
Boring and Counter boring Hole location, based on centerline distance of bored holes, 2 holes, 18” apart ±0.0015”
Hole size, maximum spread, hole-to-hole ±0.0005”
Depth of counter bore ±0.0005”
Milling (straight-line) Squareness of sides ±0.0015”/ft.
Parallelism of opposing sides ±0.0015”/ft.
Flatness ±0.001”/ft.
Angularity of ramp cuts ±0.0024”/ft.
Corner location, deviation from programmed points ±0.001”
Surface Roughness 64 RMS
Machining operation Accuracy
Contouring (circle) Roundness:
Diameters measured at 30 Degree intervals ±0.003”
Angularity: Difference between programmed and actual points of tangency of circles to straight surfaces ±0.001”
Contouring (straight line) Squareness of sides ±0.0015”/ft.
Angularity of sides ±0.0015”/ft.
5- Axes Profile Milling:
| Surface Finish, Max. | 63 RMS | |
| Roundness, Max. | 0.004” | |
| Concentricity, Max. | 0.004” | |
| Angular Accuracy, 4 readings, 90 degrees apart over a 2” | ±0.0012” |
chord length, maximum
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