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Thread: Chipbreaker boring bar
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22nd March 2012, 03:39 PM #1
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Chipbreaker boring bar
Hi
After reading the PC post on chipbreaker tools I decided to try it out .
I've always found removing large amounts of metal with a conventional shaped boring bar is, slow, tricky and the tool chatters when you demand of it, deep cuts
I ground up this thing . With the backgear engaged , around 80 rpm, this will do 3mm cuts in mild steel with ease .
The finish is rough at the moment , I haven't refined the corret shape as yet . but it has potential
The author says these tools are sensitive to speed , feed , type of metal etc .
MIKE
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22nd March 2012, 03:53 PM #2
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Grinding the Chip breaker into HSS is handy as you have found it allows the swarf to coil and break off in either managable lengths,chips or tight continous coils.
Usually the size of the HSS will determine the size or the ground chip breaker/former,the bigger the HSS the larger the grind.
As you may of allready noticed there is no need to have the chip breaker any longer than the depth you wish to cut.
These chip breakers are also quite often ground into Cemented Carbide tooling.
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23rd March 2012, 12:29 AM #3
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What are you blokes using to grind the chip breaker groove, something like a Dremel with a small stone or narrow wheel in a grinder?
Bob.
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23rd March 2012, 07:17 AM #4
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I just use the corner of a grinding wheel.
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23rd March 2012, 08:15 AM #5
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Yep, Dremel.
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23rd March 2012, 11:31 AM #6
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Dremel
Yes
I have a little air drill with a small diameter ( 6mm ) cylindrical stone on it . It's a great little tool . Mike
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