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Boring bar size

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mechman4817/09/2018 13:09:17
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2947 forum posts
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I have a varied selection of boring bars, some of which I have never used, which include insert tipped, carbide tipped plus home made bars made from broken taps, broken milling cutters, silver steel, some of which are in pics. The one in the holder & bottom right are a couple I picked up from a car boot sale which I believe may have been used on auto / cnc machines...

Small boring bars.jpg

boring bar selection (1).jpg

The smallest in my collection, top - 3mm (3.5 hole)… bottom - 5 mm, (5.5 hole)

Smallest boring bars (6).jpg

Have only used 50% of them, so far, but 'nice to have' I s'pose

George.

Alan Vos17/09/2018 19:38:21
162 forum posts
7 photos
Posted by SillyOldDuffer on 16/09/2018 16:40:27:
  1. Smallest bar is home-made from silver-steel and hardened. I made it specially to open a small hole out to a non standard size. It needs a minimum 5.5mm hole to start and goes 20mm deep.
  2. Next is the small boring bar I bought for my mini-lathe. It needs an 8.4mm hole to start and goes up to about 40mm deep.
  3. Third is the small boring bar bought for my WM-280. It needs an 9.8mm hole to start and goes about 50mm deep.
  4. Fourth is a heavy bar that came with a set. It's more rigid than the other types but needs a 16.3mm diameter hole to start and only does 45mm deep.

This is what is missing from many boring bar specifications - the minimum size starter hole it will fit into.

I liked the small solid carbide boring bars Arc used to do. They only needed a very small starter hole.

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