replaces the compound. The compound has multiple degrees of freedom. It can
rotate here, move along this axis, the quick change can rotate around the tool
post stud, and the entire compound can move along the cross line if the
compound studs are not tight. This makes the compound one of the weaker spots of
the lathe and the South Bend design is especially weak because of the small
diameter post that the compound rests on. During a heavy cut one can actually see
the compound flexing and that flexing, with a tool like this cutoff tool, will
cause it to gouge the material and the spindle stall and the machine to crash.
from rotating. The second reason to replace a compound
is to accommodate larger tools. When I installed the Aloris AXA onto this
compound, I milled out this area to lower 3/8 inch tools down to the
centerline of the spindle. now I want to use half-inch tools and to do that I'd
tool post mounts. He has a couple additional features. He adds a pin here
for positive registration of the quick change and slope on this side for chips
Stefan Gotteswinter and he didn't include this boss instead he uses a small piece of
steel to press and hold the quick change in position and the pins that piece of steel.
certainly the coolest and that's Vic Rivers of Rivers Company and he replaced
not only the compound but the cross slide as well making them one integrated
is made from a single piece of gray iron. It's a type of cast iron that
The first thing I do is to square up the stock and then take it to size. To fill any gaps between
the vise and the stock I'm using a piece of aluminum rod that gets compressed, and
as a surface is faced, and it'll be rotated toward one of the sides of the
vise. Now two sides are faced and those go against the fixed and movable jaws,
and the irregular side is facing down square it up best we can on this side,
squeeze it in the vise, and continue. When I first started this I used the fly
cutter and it's maximum swing and there's a lot of vibration just because
the lack of rigidity in the fly cutter. I made the small program to make three
passes and that is half of the fly cutter on the front half, on the back, and
then the middle, all coming from the same direction. This will leave three high
places if the mill is out of tram that can
the origin is all that's really necessary in order to chamfer all the
mill cast iron without sort of lubricant or coolant but you can see
that these chips are pretty hot. Maybe it's the graphite content that's assumed
to provide lubrication, but the tool and work piece still get hot, so it seems
running at 1500 rpm, 17 millimeter depth of cut, and ten thousandths of an inch
step over. The g-code was generated in Autodesk Fusion 360 and this is a 2d adaptive
clearing operation with both ways enabled. For the most part, milling
particles that are floating in air. You could see how they attach to this magnet on
the side of the mill. That circle that you saw on the magnet is actually where the
threads per inch thread for the tool post . it's a single profile thread
mill, and the nice thing about a single profile thread mill is that you can do a variety of
this gets chamfered to the major diameter of the thread and this helps the
screw to start easily. Another nice thing about the thread mill is that I'm practically
able to bring that thread mill to the bottom of the hole. I don't need to have
a lot of clearance at the bottom for a tap. With the quick change mounted I want
to be able to slide the tool holders past the bottom just slightly in case I
on the t-nuts, and have sized the four larger sides, and
making the grooves that turn this into the tee shape. This was made from cold
rolled steel stock and unfortunately once I took it out of the vise it turned into this
smile shape. I cut this up into four pieces and then began to clean that
up. This is a 6.7 millimeter drill for threading this hole to eight
millimeters. With single profile thread mills you have to run the thread mill
the entire length of the thread, but with multi profile thread mills you only need
to make one rotation to cut all of the threads. To use these you have to run the
program slower to give the tool plenty of time to cut because it is cutting
more than with a single profile thread mill. I want the t-nuts to fit snug in
the t-slot and the 20 thousands of an inch radius of the half inch end mill is just
enough that it creates interference, so this is a square end mill that's being used to
clean up that radius. In this picture the part with the radiused corners is on the
right and the part with the square corners is on the left, and you can see how with
This is a neat comparison between three different threads the top-center is
thread milled and bottom left is tapped and then bottom right is a hex nut, and
the quick change. Set it aside. Loosen the nuts on either side of the compound. Slide the
compound off. Next we install the T nuts into the T slots. And these new T
nuts are threaded down to 20 thousandths of an inch above the bottom of the t-not, and
that's to keep longer screws from ever being used and jacking the t-nut up
secure this the solid tool post mount into place. The mill did fine job on the
surface finish but of course the shininess it comes from work with
are flat faced so they don't mar the quick change, and I think I'll add a
second set screw behind each of these to lock the set screws pressing against the
quick change in position/ Alright, thank you for watching. Let me know you think of