When using a boring bar in a boring head, should the cutting face be in line with the diameter of the head, or angled to provide rake?
How to align boring bar in head
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J C describes my method to a T also, and, for the same reasons ... just what has evolved as seeming to work well....
Course we ARE talking about "eyeballing" the setting here and my "calculated" eyeball and yours are bound to be -- possibly quite a bit -- differentIf everything seems to be going well, you have obviously overlooked something........
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Eye ball it on centerline of boring head . If not enough clearance grind a little more on it where needed. You want have a problem with good name brand bars But the Chinese import bars need all the help they can get.Every Mans Work Is A Portrait of Him Self
http://sites.google.com/site/machinistsite/TWO-BUDDIES
http://s178.photobucket.com/user/lan...?sort=3&page=1
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Just my thought, but I always seem to have to worry more about clearance than rake. Many times I have had to grind additional clearance on boring bars for small diameter holes.
Setting the cutter below the diamerer increases one angle and decreases the other. And vice-versa for above. Tilting the cutter has the same effect. To increase both angles you must grind and so it may as well be on the diameter or centerline.Paul A.
s
Golden Triangle, SE Texas
And if you look REAL close at an analog signal,
You will find that it has discrete steps.
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Not on centre-height.
Put a washer the same size as the hole you are going to in the chuck if boring on the lathe or on the chuck or what-ever on a rotab. The clearances will be very evident.
For HSS, I use 10>15 degree of top and side rake with 5>10 degrees front and side clearance for HSS.
I set my boring bar tip about 0.020>0.040" (depending on bore size) above centre height so that when it "dips/dives" under cutting load - which it will - it is moving away from the work-piece. Set it as centre height and as it "dips" it gets further into the work, "dips" some more etc. and then the "gouging-in" and "chattering" begin.
I find it works best with as fine an edge as I can get for least resistance and use HSS.
I take my time as I have no need to hurry.
Using TC is my last option unless the set-up is very rigid.
Others get good results using different approaches.
Same for internal threading.
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