CNC Milling
A simple, crude but usable Z axis mount
Note that motor is twisted slightly relative to the column to make the geometry work.
The Z axis mount from the top
Update: I have added the extended Y axis and put the ballscrew on the Z axis.
 The
dial indicator is set up to measure movement in the base and column
assembly. Pulling on the top of the column (avoiding the head) causes
about .003" of motion. Pulling really hard gets .005". I have replaced
the M8x25 screws with grade 12.9 bolts, which I think helps. |
 The
gas strut needed an extension to accommodate the tilting axis. this
works just fine. |
 Here's
the Z axis ballscrew mount. This made a BIG difference, a ballscrew is
way better than the original mechanism. More accurate, and much less
force required.
It does need to be stiffened, that mounting plate flexes. Mostly because I had to drill out the holes by way too much. |
 More
of that Z axis. |
 And
the Z axis from the other side. |
A few parts I used from McMaster:
Plus, 20mm skateboard bearings; A machining vise from Penn Tool (invaluable). Replaced a bunch of screws with better ones.
|
The other block I made from aluminum, making a bearing pocket with a cheap rotary table. This caused enormous chatter, the mill moving around. but I did get it done. |
Suppliers
Little Machine Shop - Parts for the micromill and minilathe, and many useful odds and ends.
Enco - Most things; google for free shipping for $50 coupon.
Online Metals - raw materials in small quantities
800watt on eBay - A low-cost seller with many, many useful tools.
Discount Machine Shop eBay seller with more stuff