That was kind of the idea
I already own a Sieg X3 Super mill and a Sieg C3 Lathe for building the parts with.
Nice Machine LeeWay that spindle mod of yours has given me more ideas.
I was planning on starting off with a Sieg X2 mill head and using it to build parts for a spindle (this would be rather slow at 20 ipm max cutting speeds).
I did a bit more maths and worked out a 100ipm max for my wishlist (full Y travel in 3-4 seconds
) that gives me a 15,000+ rpm spindle for the sort of small tooling I want to use but that's quite a way in the future and I am terrible for doing that, thinking about step 10 while working on step 1
.
After even more maths I worked out that 45x45 gusset plates and 90x90mm plates for the X axis should give plenty of strength against flex according to Bosch the extrusions of the size and length I'm using are good enough for about 20 times the forces the mill should be capable of generating, however the rotational forces worry me a bit.
A very rough calculation of the force trying to rotate the X axis (with the super spindle) gave me 1500N, too much force for 4 Bosch gusset plates at 90x90mm but 100x100mm plates would give me 1920N resistance
not much of a margin there, time for some reinforcement I think.
I definitely like the idea of getting extrusions cut to size digits, I didn't fancy trimming them down on my mill to size them properly
Giant Mecchano
Phew, loads of info for me to digest, cheers guys.
Nick