FILENAMES:

ca_toolpost.jpg
ca_insbar.jpg
ca_barholders.jpg
ca_holders.jpg
ca_bigbar.jpg
ca_balance.jpg

DESCRIPTION:

These are pictures of a large quick change toolpost and holders
built by Wayne Cook <waynec@pan-tex.net>. Wayne provided 
the following description:

=================================================================
  This is a set of pictures of the larger CA size
toolpost I made. I made it to go on a 20" American
Pacemaker at work for a job that really needed
the repeatability of this style tool post.

  First shot (ca_toolpost) is a shot that will help
give you a idea of just how big this post is. You 
might also note that I used the original Stevenson
style dovetail on this post. The holder that is in 
there in this shot is the universal style bar holder
like I showed in the 400 series pics. It's holding
a Iscaar insert grooving bar. One of the reasons I
made the universal holder was because at the time of
making the holders I didn't know what size this bar
would be for sure (we were still talking to the rep
at that point).

  This shot (ca_insbar) is a better shot of the insert
grooving bar and the universal holder I made. I will
explain about the wire loop in a later shot. :-)

  The ca_barholders pic is a shot of both the universal
holder and the "big bar" holder. The big boring bar
is 1-15/16" dia and holds a 7/16" brazed tool bit. 
I had to lighten it's holder and shorten the bar a
bit just to be able to take them in and out of the
toolpost. On this lathe it's almost a full arm extension
to just be able to reach the boring bar holders for me.

 The ca_holders pic is not a great shot but it shows the
turning holders and gives a decent perspective of the 
lathe itself. All holders for the bar where made from
2"x5" HR stock sawed to length for the different heights
of holders.

 The shot ca_bigbar pic is a shot of the big bar in the
post. In this shot it is sticking out 9"+ (I was boring
out some 304 pipe that finished 8-3/4" long). I put this
shot in since it shows the unusual height adjustment I 
put on this holder. Due to the weight of this bar and
holder (it was a lot more before I milled off the cap
and cut the bar off shorter) I was afraid of bending the
1/2" all thread height adjustments I put on the other
holders. Also this holder is so tall that it could very
well need to go above the top of the tool post in some
cases (in the picture the bar is actually 7/32" below 
center to compensate for the thickness of the 7/16" 
cutting tool, I didn't make that bar or the groove would
of been offset to compensate for that fact). You can also
see the wire loop in this shot as well. I guess that's 
next shot.

 ca_balance is a shot that explains the wire loops. The 
job I was doing here was the boring and grooving of 
about 180 pieces of pipe. I was getting about 22 a day 
done so I had to change tool holders 44 times a day.
Holders this size are heavy and with the long reach it
got pretty tough to do with the bar stuck out that far
(the only place I could get close enough to pull the
holder up from was behind the cross slide, the handwheel
gets in the way on the other side). I threw this rig 
together in a hour the morning I had to stick the bar
out that far (the first half of the pipes where shorter).
Notice also the chuck pads on the jaws. In order to chuck
the pipe solid enough for the grooving operation we had
to make the pads to help with the chatter. I made them
by turning a piece of pipe till it fit in the chuck hole
with some to spare (for opening) but I left the part sticking
out of the chuck near full size (just cleaned it up). 
I then chucked it and bored it to the nominal size of 
the pipe and then welded the clamp bars to it with the
setscrews already tapped. Then it was a fairly dicey
sawing operation in the band saw to split it in 4 pieces.

  Well that's all the shots of the larger tool post. I hope
you enjoyed them.

Wayne Cook