Making the index plates for drilling out lantern pinions
on the milling head.
The first step was
to cut brass discs from 2" bar.
These cut discs would be mounted in a pot chuck or
stepped collet on my Sheldon lathe.
This is the collet
to be used.
Here is one of
the discs mounted in the collet - note the disc stands proud of
Using a large center drill to eliminate deflection,
the center hole is started.
The hole is then
drilled to 1/4" diameter.
The drilled disc
is then faced off on both sides.
A cutter is next
carefully ground on my Gorton single lip tool grinder...
... and mounted
in the spindle of my Chronos wheel engine.
The discs are all notched with a 60 degree notch to
convert them into index plates.
Another view of
The notched discs are again faced off on the lathe
and drilled to fit the milling head draw tube.
These 7 indexing plates will allow drilling lantern
pinions having 3, 4, 5, 6, 7, 8, 9, 10, 12, 13, 14, 15, 16, 18,
and 20 pins.
I'll use the remaining three discs to make the missing
11, 17, and 19 index plates. But I need to switch the master plate
on the Chronos wheel engine before making them.
Here is the milling
head with an index plate mounted on a WW lathe.
And here it is mounted on the WW lathe set up for Pinion
drilling and milling.
drilling, the milling head casting was tapped.
This is the mounting for the indexing spring.
Here is the completed
This spring just clicks into "lock" position
as the brass index wheel is rotated. It all works perfectly!
My next concern was for lighting. I located an LCD
ring magnifying lamp with magnetic base and a very intense LCD
bulb to use with a small desk lamp. These are shown below.
The results ...
Ring lamp only.
Both LCD lamps on the lathe ...
A view through the magnifying lens ...
In conclusion, I am pleased with the final result of
this little project to make a lantern pinion drilling accessory.
Based upon what I have seen with the Chinese milling attachment,
the lathe would probably be an acceptable machine. I am so pleased
with the outcome of this project that I have also ordered the
pulley arm for supplying power to the milling head so that I can
also use it under power and not merely as an index head for drilling/milling.
Click here to go to part one.