Quote
uncle_bob
Another subtle issue is that delta's print big circles / small squares. A cartesian machine prints a big square / small circle. If your target gizmos are big squares you go one way. If your target "stuff" is roundish you might go another way.
Bot types:
Cartesian.
Articulated arm (robot).
Delta.
Polar.
Hybrid (combination).
It would be useful if a new type of motion was invented. (tu)
The reason I'm studying delta printers is because I need to produce very round prototypes.
I'm hoping that I can get a surface finish, and dimensional accuracy suited to make cold casting molds from the prototype.
Quote
uncle_bob
I've never understood if the main concern is "crud" or if it's straight impact damage due to the induced vibration. Since the gizmo is magnetic, it will grab on to any bit of this or that. Of course that's true if you bolt one to a CNC as well. I do believe I've seen at least one being used on a CNC...(in say the last 5 minutes).
With hobby CNC routers you will find exposed stepper motors.
If you look at industrial equipment the entire motor or ends are typically sealed or at minimum covered.
The shields on bearings can be assembled incorrectly, have defects, or are of poor quality.
If you're hand grinding a small flat, it's precautionary to cover the bearings, and to prevent heat from migrating into the bearings.
If you're milling the shaft, the mill will hammer the harden ball bearings into the soft metal of the shaft creating indentations.
The bearings and indentations in the rotating shaft create a mini hammer mill of sorts, which will eventually self destruct it's self.
I watched an online video of this tech tip, very useful.Quote
CTF
Using kids putty to mask the insides of the steppers and the output of the shaft works very well to prevent dust.