Advancements
Manufacturers are continually pushing the envelope in regards to what can be accomplished with the singlepass process. Improved tool, fixture, and machine designs have allowed for increased production rates as well as improved bore precision. The following are some of the latest advancements that have been made.
Long Length to Bore Ratio:
One of the myth’s that has been associated with the singlepass process is that it is only well suited for finishing relatively short bores. As illustrated in some of the case histories in this paper, bores with length to diameter ratio’s of over 10 to 1 do not present a problem. With the proper tooling, fixture, and machine tool, the singlepass process is even capable of removing a camber or “banana” condition from the bore in many applications.
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| Long length to diameter ratio gun barrels finished with single-pass process. |
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| Case History #7: (Gun Barrel) |
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| Diameter: |
11.26mm |
Length: |
165mm |
| Material: |
Stainless Steel |
Hardness: |
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| Bore Type: |
Thru |
Stock Removal: |
0.130mm |
| Tool Pass #1: |
11.163mm |
Diamond Size: |
40/45 |
| Tool Pass #2: |
11.190mm |
Diamond Size: |
40/45 |
| Tool Pass #3: |
11.217mm |
Diamond Size: |
40/45 |
| Tool Pass #4: |
11.244mm |
Diamond Size: |
40/45 |
| Tool Pass #5: |
12.258mm |
Diamond Size: |
100/120 |
| Tool Pass #6: |
12.265mm |
Diamond Size: |
200/230 |
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| Bore Quality |
Required |
Achieved |
| Size: |
.012mm |
0.005mm |
| Roundness: |
.012mm |
.005mm |
| Straightness: |
.005mm |
.002mm |
| Surface Finish: |
0.30Ra |
0.25Ra |
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| Machine Type: |
Engis Model # 9825-16 (6 Spindle Machine) |
| Coolant: |
Engis SP2240 Honing Oil |
| Production: |
50 Parts Per Hour |
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| Special Note: Peck Style Motion, QuickChange Fixtures. |
