Update 25/01/17 - The machine is now assembled and cutting! I have been reasonably impressed so far with the general capabilities of the setup. However, @Julius was right in the fact I need to stiffen the Z\X axis. I am getting a lot more torsion than I would have expected. I am not sure if it is coming from the temporary 20x20 uprights, the Z-X axis interface, or the C beam itself. Wherever it is coming from, it is quite a lot.
I have started machining some new side plates - similar to an OX setup, however this was hard work given the current amount of deflection. The plan was always to replace the uprights, but I was hoping to be able to do this quite quickly. But I am not sure if my current setup will be able to achieve this.
I am now on the lookout for ideas on how to stiffen the Z\X axis to help me machine aluminium. Any ideas or links to machines would be greatly appreciated!
Update 28/09/16 - All the parts have arrived - now time to start building!
I am in the process of building a mill\router based around the C beam sections. Intention is to use the 1m C beams for X & Y axis. All axis to be lead screw driven.
Initial design (not yet complete) is completely based on OB parts. Ideally the machine will make parts for itself to strengthen and improve.
The interface between the X and Z axis is based upon Moag's Mill, with the double XL plates. I suspectthis will be the weakest link in the build, as I am not sure how torsionally stiff the C beam sections are. I expect I will need some extra support to stiffen this area.
Currently I have 2020 beams supporting the X axis, however I will make some custom side plates, similar to the OX plates, except having lead screw driven Y axis instead of belt.
As I am based in New Zealand, OB parts are expensive to import - although there is a local distributor. However some of their prices are a bit off the planet, hence I will be sourcing parts from both NZ and USA.
I am ordering big strong NEMA23 steppers (387oz.in) driven by a Gecko G540. This will give me the flexibility to run the machine a little harder once I improve. Or if need be, transfer the motors to a bigger, stronger mill I build later.
Any suggestions to help my design will be appreciated!
OX based lead screw Machine
Initial design for my CNC mill\router based around C beams
- Build License:
- CC - Attribution - CC BY
Inspired byMoag's Mill, Schematix OX-Metal