Good day,
I am in the process of designing a manual vertical milling machine, which I plan to build from scratch out of 80/20 extrusions. My design is simple but would like some approval from some of you members on the zone before I plunge into the build.
I would like to have 20” in the x axis, 12” in the y axis and 8” in the z. My main purpose for building this vertical mill this large is because I don’t want to have wished I built or bought a bigger vertical mill in the future. The project I would like to keep on a budget of $400-600 but if necessary will go higher than the budget. I would like for the vertical mill to be as precise as my budget allows. The types of projects I would like to take on our things such as model engine building and hobby projects. I want to build the vertical mill as a manual mill first then in the near future, upgrade it to a CNC mill by just adding the motors, controllers and software.
So now for my design and my question. I would like to eliminate the use of linear slides, or ballscrews on my mill, and just use precision acme threaded rods and acme nuts to control the axis. Meaning I want to weld acme nuts onto a metal plate, bolt the plate to the table and control the axis with the use of a hand wheel (the acme precision nuts will not turn just the acme threaded rod with the use of the hand wheel).
I would like to use these acme precision threaded rods from MCMaster-Carr http://www.mcmaster.com (Model #): 99030A110
(This is the threaded rod description if you cannot search by model number: 1018 Carbon Steel Precision Acme Threaded Rod 1/4"-20 Sz, 1/20" Travel/Turn, 6'L, Rh Thread)
The acme precision nuts that I would like to use are these (Model #): 95072A450
How do you guys think this design will work? Do you think I will get extreme flex in the rods and it would not be worth it to build the vertical mill this way or do you think I can pull it off and the mill will be inexpensive while still being precise?
Please let me know your views about my project.
Thank you