Bore
Bore operations produce precision holes with excellent surface finish.
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Figure 8.34: Boring
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Rules for Boring
- Ensure the hole for the boring bar is large enough for tool clearance during all moves, including the lead-out move away from the finished surface.
- Be sure to fully extract the bore bar out of the hole before sending it home.
- Precision holes require the correct amount of stock remaining and proper cutting speeds and feeds.
- Add roughing passes as needed before taking the finish cut to ensure constant material thickness for the finish pass.
- Extend the tool path slightly beyond the back of the part to ensure a clean edge after cut off.
- For precision holes, such as press fits, consider backing off the X-offset several thousandths of an inch on the first part Machine the hole, check the actual finished bore diameter, and then adjust the offset as needed to produce the precision hole.