FILENAMES:

BoringBar01.JPG
BoringBar02.JPG 
BoringBar03.JPG

DESCRIPTION:

These are pictures illustrating line boring bar usage.

Posted by Wayne Cook <waynec@pan-tex.net>. 

The following description was provided:

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 These are some shots of the setup I used to bore
the bearing bores on a track hole. I had to bore
both the end of the boom and the holes in the bucket.
This line boring setup is military surplus and based
on the time when it was bought and what's in the set
my guess is it was built to line bore V-12 engines. 

  In BoringBar01 you can get a pretty good idea of
the overall setup. I tack welded the box beam and
angle iron to the boom. Then using clamps I assembled
the adjustable bearings. As you can see the bearings
are fairly versatile with the ability to use with or
without the right angle extensions. The wrench to
tighten the ball/bearing mounts is on the beam below
the boom. It works like a drill chuck key.

  BoringBar02 is another shot which shows the feed
mechanism better. The feed is done by the screw 
attached to the end of the bar by the setscrew. It
has gears which allow the nut (which is released in
the pic) to turn with the screw but at a different
rate. Thus the feed is much finer than the screw is.

  BoringBar03 shows the self aligning bear/mounts
a little better. These can be used as either bearings
or supports for the right angle bearings. In boring
the bucket for this trackhoe I used these without the
right angle bearings. I just clamped them straight to
the flange on the bucket. It's been long enough that I
can't remember if I added a bearing in the middle of
the bucket or not. I may have for additional rigidity.