My time project.

Hi,

I have my big printers now so about 2500h the drive now turned into operation and in the course of improvement of direct couplings on short endless belts.

He belongs with 3 x 400mm space to the larger printers and up to the clutches that made more and more problems with time in the printed fixed bearings he also met his expectations for me as far.
The IGUS helix lead screws with 25mm pitch I use are strong and durable when applied properly and that as yet no obvious wear. The separate nuts-tails, which are braced against each other through each of still sick and without clearance on the spindles.

I operate the printer with 24V, 2.5A Nema 17, which are more than adequate and a RADDS. On the Y-axis each spindle has its own respective stepper motor which I have not mechanically coupled, which works without any problems until today and also in my CNC milling. THe axis sit constructed so that it can survive a displacement of more than 15 ° damage free, but this has proven only with conversions, but never during operation as necessary. To adjust the fixed bearing constructed such that only up to the stop you push the Y axis to the rear and this aligns so perfectly at right angles. As long as the axis then no handles it has also never been adjusted. The paralell two Silencioso stepper driver controlled stepper motors run wonderfully syncron.

Each printed from ASA parts fixed and movable bearings are what also when taking into account the material properties works very well.
As fixed bearings I use now only each a high quality skater stock put away those stresses that occur on time wonderful and cost hardly anything when compared to the otherwise used as a fixed bearing and still work today easily and without play.

The spindles themselves run nice, but have a certain basic resistance that is not too high not to be moved by a Nema 17 when properly adjusted, however. By the nature of the drive that was with me but no negative effect on the print.
What, however, is really difficult is the spindle and align especially the spindle nut clean. Since not the slightest deviation or play may be present in the guides and everything else. In one case, someone has e.g: no Linear rails with how I used it easier to have some game. The commented then that the cops always have stiff bodies, or blocked. Since one has to take in hiring great deal of time and consider even starting with design and construction. The spindle nut I also deposited with the installation of the three anchorage points with a 1.2mm of O-ring and can so easily align perfectly with the axis of the spindle, since they do not forgive unlike ballscrews misalignments in Gering Estonians this.
What has been found and proven to me to be necessary, the spindles also lubricate with grease. If one does not occur at speeds lansamen to chatter marks on the printed parts, because the spindles start via the spindle to shocks, resulting in the nuts on duration certainly does not look good. With fat but the problem is corrected immediately. It takes a very long way to the spindles are broken in. I could only be identified after about 500h that the spindles over the entire length run really smoothly and since then it stayed that way.

I drive the printer with 64 steps and prints so that appropriate components up to 300mm / s. Moreover, it would be feasible by the technology, but that is the limit Hotend ago.
When printing itself of these prints to date my most precise, especially when it comes to technical components, however, the structure with the spindles is forgiven a lot more complicated and more difficult in adjustment as with belt, since no deviations and if they are still so small will.
I print and ABS in the closed space and also works well as heat up all the pieces in this equally and the thermal expansion of the bearing blocks is just the same.

And here's a little video from the first test after reconstruction. The file is, however, not been developed and runs here with 100 mm / s with PLA

https://www.youtube.com/watch?v=vmOmUK-pFsc

Greeting Edwin