aligning boring bar on mill

This topic has 9 replies, 8 voices, and was last updated 28 February 2021 at 18:01 by old mart.

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27 February 2021 at 08:47 #530465
paul telford
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@paultelford26106
Hi,

prob a beginners question and I can't find the answer by searching.

I'm trying to understand how to set up the boring bar in the boring head. Some boring bars have a flat on so I suppose when the screws are tightened it will self align but mine are round.

It would thus be possible to tighten the clamp screws anywhere on the diameter of the shank of the bar and would just be a guess as to the angle that the insert makes to the material (even to the extent of the insert not even contacting the material).at all.

How do I ensure the correct angle that the insert makes?
Advert

27 February 2021 at 08:47 #20176
paul telford
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@paultelford26106
27 February 2021 at 12:28 #530514
not done it yet
Participant
@notdoneityet
Perpendicular to the tangent would be the ideal starting point, I expect?
27 February 2021 at 12:56 #530525
bernard towers
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@bernardtowers37738
Yes NDIY that’s all I do and don’t seem to have any problems.
27 February 2021 at 13:01 #530531
Howard Lewis
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@howardlewis46836
+1 for NDIY method

To maximise rigidity, use the shortest possible extension.

Howard
27 February 2021 at 13:06 #530533
Hopper
Participant
@hopper
And be aware that some of those brazed carbide boring bar tips straight out of the box are not correctly ground and need a final touch up on a green grinding wheel to make them sharp and actually cut.
27 February 2021 at 17:40 #530576
old mart
Participant
@oldmart
I have a 2" boring head fir milling and was never happy with the nasty brazed cutters. I bought a set of these which have 1/2" shanks and secure them with the flat of the insert a few degrees from a line between the centre and the insert. The wording of the advert is a bit misleading, as mine have identical shanks and the heads vary in diameter. Anyone interested in them would be advised to contact RDG for clarification.

**LINK**

Edited By old mart on 27/02/2021 17:52:40
27 February 2021 at 18:12 #530585
DiogenesII
Participant
@diogenesii
..If you centre the spindle over the fixed jaw of your vise / edge of a parallel /slot/angle plate first, you will have a diametral reference plane against which you can then visually check the set up of the cutter…
27 February 2021 at 18:42 #530593
Tim Stevens
Participant
@timstevens64731
You may find it difficult to remove a bit after the grub screw has been properly tightened. To avoid further trouble you can grind a flat on the shaft to remove the grub-screw burrs, and this also helps to locate the cutter as it was, every time.

Cheers, Tim
28 February 2021 at 18:01 #530784
old mart
Participant
@oldmart
I was not sure if a fixed angle would be the optimum one, so I just made a small mark on the tool shanks with the grubscrews, removed them and then lathe turned a reduced diameter where the mark was. Then they won't get trapped by the burr and can still be fine adjusted for cutting angle.
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