Medium
Process:
I took a job boring some Acetal for a gentleman in town that has a bag pipe shop and the pieces that needed to be bored were fairly deep so I needed a rigid boring bar that would fit in the hole but be sturdy enough not to flex so I decided I was going to make one from scratch.
In retrospect, I should have done a bit more research as to the geometry of the boring bar and I would have designed it differently, but for now it'll do. I just might make some modifications down the road if for some reason it won't fulfill its purpose.
Pictures:
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| Marking the cut-out for the insert |
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| Marking the center line |
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| The AutoCAD drawing calculating the angle and clearances |
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| Milling a flat at the top |
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| Drilling the hole for the screw that holds the insert |
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| Another view |
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| Another view |
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| Milling the flats for the tool holder |
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| Another view |
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| Drilling the screw hole to the final size before tapping |
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| The installed insert |
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| Another view |
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| Another view |
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| Close-up of the finished boring bar |
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| Milling some shims to size |
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| Another view |
Tools:
Metal lathe & accessories
Metal band saw
Materials:
8" of 1" cold rolled steel
1 screw
Cost:
$0.00
Time:
4 hrs
Savings:
$100
Conclusion:
It works but it will need some more tweaking
I like it none the less. It does look however that the leading edge of the insert may be slightly off of 90° but that may be an optical illusion if you are satisfied with the rake angle and it produces chips why worry
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