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- Thread starter Dtuck
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I'm skeptical about holding a consistent 16 finish with a boring bar, even under the best of conditions.
Software For Metalworking
Software For Metalworking
Short and fat is where it's at.
What is the diameter of the bar you're using?
I'd be shooting for one at least .75 inch diameter with no more than 1.6 inch overhang.
What is the wall thickness of the part? Depth of cut?
varying the speed during the cut can sometimes work wonders. Some experimental machine tools use the output of a vibration sensor to actively control speed.
What is the hole diameter tolerance? Maybe a spade drill or boring bar with pads would do the trick.
What is the diameter of the bar you're using?
I'd be shooting for one at least .75 inch diameter with no more than 1.6 inch overhang.
What is the wall thickness of the part? Depth of cut?
varying the speed during the cut can sometimes work wonders. Some experimental machine tools use the output of a vibration sensor to actively control speed.
What is the hole diameter tolerance? Maybe a spade drill or boring bar with pads would do the trick.
- Thread starter
- #4
MikeHalloran
Mechanical
Wild hair idea, half baked:
Cylindrical sleeve nearly as big as hole to be cut, with eccentric bore, close fit in holder.
Boring bar close fit in sleeve's eccentric bore.
Cross feed at bottom of hole by rotating sleeve in holder and boring bar in sleeve at the same time, moving the cutting edge radially inward. Maybe you can do it with just levers, maybe you need gears.
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The other choice is cutting the bore and radius with the outer corner of a wide tool in the end of a fat boring bar. I.e. the end cutting edge extends across half the bore.
Either way, getting the center cut relies a lot on luck.
---
Speaking of which, maybe you could just use a fat center cutting endmill as a boring tool.
Mike Halloran
Pembroke Pines, FL, USA
Cylindrical sleeve nearly as big as hole to be cut, with eccentric bore, close fit in holder.
Boring bar close fit in sleeve's eccentric bore.
Cross feed at bottom of hole by rotating sleeve in holder and boring bar in sleeve at the same time, moving the cutting edge radially inward. Maybe you can do it with just levers, maybe you need gears.
---
The other choice is cutting the bore and radius with the outer corner of a wide tool in the end of a fat boring bar. I.e. the end cutting edge extends across half the bore.
Either way, getting the center cut relies a lot on luck.
---
Speaking of which, maybe you could just use a fat center cutting endmill as a boring tool.
Mike Halloran
Pembroke Pines, FL, USA
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