Dear All,
I am up to a vertical CNC project to one of my friend for 3 months.
This is something serious project.I have designed very big machines before around 140 tons-300 tons and several high tech machines however i dont have any experience with CNC design so far.
I started my engineering carrier as CAM&CNC responsible Which is a plus thing.
I want all of you guys learn what I learn on this path and take any advice or critics which are all welcome.
Now to tell something for a start about this very project which is eating my brain for 3 months day and night.
Material to be machined is marble.
X axis 3 m - Y axis 2 m - Z axis 1 m
Complete welded construction cost without milling head
and 15kW spindle, tool change magazine (14 tons) : 30.000 euro
(X-Y-Z axis drive unit parts, servos, ball screws, bearings, couplings etc are included, sand blasting, painting, flexible cable trays inc.)
Hybrid construction :
for concrete based casting is 7.500 euro cheaper
For epoxy granite casting 5.000 euro cheaper
Y axis bridge (2,5 tons) , Z axis saddle (500 kg) are weld construction while there is a 50% chance to build ram (400 kg) gray cast iron.
(GG40)
X axis column and footings are hybrid (steel embedded concrete).
Each footing is 1.250 kg while %25 is concrete.
I will decide to choose ultra high performance steel fiber reinforced self compacting deairing concrete or epoxy granite for footings and columns.
It seems epoxy granite will be minimum %50 more expensive than the concrete based casting.And disadvantage of epoxy granite is the thermal
expansion is higher than steel while concrete based casting remains similar.
UHPFRC Concrete Mixture:
Concrete+Slag+Basalt or river quarts aggregate 5-10 mm+ fine sand+plasticizer (to reduce water requirement)+160 micron diameter steel fibers+silica fume+water+additive to reove air balloons+shrinkage reducer additive
One of my customer has a basalt mine while another one has a quartz crushing plant. I will receive those for free.
I am going to share the distribution later after some tests.
Coarser agregate result less water requirement however lower flow quality.
The compressive strength goal is to reach min.100 MPa
I am going to use anchored with M20 screws, 40 mm thickness plates embedded on and bottom of the column and footing.
I tried add perspectice screen shots however I keep receiving error.
I will share each axis drive units in the coming days.
I will purchase or do my own fork type 2 axis milling head.
It is goin to be welded conatruction at first and it will be updated gray cast iron casting after seeing the results to have a accurate casting model.
Servo+Cycloid drive (with a ratio 153) for C axis
Direct drive for A axis.
I will ad pics when i get to my computer.