We need some more 2nd operation capacity and redundancy and we have an old Hardinge lathe gathering dust. It already has a nice spindle and 3-phase motor (I hope, as I have not yet put power to it). Would be nice if we had an unused machine with a 16C sized spindle as that would also handle many of our 1st op jobs too, but this little 5C setup will do many of our jobs.
As a side note: We also have another old 5 foot long lathe bed that is begging to become the base platform for a double-lathe setup - 16C spindle on the leftmost 35 inches of it, and a 5C spindle on the rightmost 25 inches of it. I'm even contemplating making it into a 75-degree slant-bed design. A LOT of capacity from a small footprint! This double-lathe project will wait until we find suitable spindles (or I get the ambition to make my own starting with more readily available drop-in spindle cartridges).
See attached renderings of my initial design ideas.
I'm thinking of the following major features:
- all aluminum (except for the rails, hardware, fasteners, etc)
- double T-slot for mounting a nice gang tooling holder
- plenty of extra T-slot space on servo end of X platform for cutoff and other tools.
- around 10 inches of X and Z travel
- steppers - size 34 with WAY more power than needed to ensure no lost steps (and this will only ever cut 360 brass or occasionally some bronze)
- Gecko 203V drivers
- single-phase to 3-phase inverter/VFD
- Mach3 running on a cheap Windows 7 machine
- C11T board from CNC4PC
- HiWin 20mm rails
A couple things about this base machine are, in my opinion, less than optimal:
- I don't love the existing T-slot arrangement on the original lathe bed - one slot on top inline with spindle and one slot on back side of bed.
- only 4.5 inches from top of lathe bed to spindle centerline leaves me little room for a thick rail mounting plate and cross-slide plate (although I have the gang tool holder sitting on 1 inch thick aluminum)
Trying to keep this relatively inexpensive, but will purchase all new components if I cannot find otherwise. Either way, I think it will end up being very cost effective - especially considering that it will give us redundancy in a couple areas where we currently have none - as backup to two other very old CNC conversions on Hardinge toolroom lathes with Fagor 8025 controllers and components which continually surprise us with random glitches.