Topic: Circle Calibration
I ran the Circle calibration print(link below) and I am out .18mm on X &* Y axis do you think I can get it dialed in closer?
How accurate can you get them?
Ultimaker S3.
- dubbsd
- Member
- Offline
2 2014-12-30 15:18:06 (edited by jagowilson 2014-12-30 15:20:35)
Re: Circle Calibration
Not sure about the drive system on your particular Makerbot but the one in our lab has about 0.2mm out of round we never could eliminate. I suspect it's either from slop in the linear bushings or a problem with the back rod and/or its drive belt--it is pretty much the same Y axis design used by Solidoodle.
The answer is probably no. Not without modification. Upgrade everything to bearings.
3 2014-12-30 15:58:36 (edited by redbarret 2014-12-30 15:58:56)
Re: Circle Calibration
Wait, Makerbot doesn't use bearings?
And what do you mean by "slop in the linear bushings". Tell me more. At that cost I'd expect more from them.
Solidoodle 4
4 2014-12-30 16:45:59 (edited by jagowilson 2014-12-30 17:24:58)
Re: Circle Calibration
The makerbot in our lab is old so keep that in mind. It's an early replicator without an enclosure or heated bed.
The makerbot in our lab uses bushings to slide along the X and Y rails. These are not ball bearings (like LM8UUs) and they rely on tolerances and the properties of whatever they're made of (bronze, I think) to slide. This means they have significantly more slack than bearings because the hole is much bigger than the rod to allow sliding. The lack of reciprocating balls also means they have more friction. So each move by the motors to change direction has to pick up the slack, and overcome the high static friction. Beyond that, kinetic friction is also an issue.
Re: Circle Calibration
I agree on the reduced friction but I don't see the hole being slightly bigger than the rod being a cause of significant backlash on a 3d printer.
The rods aren't perfect either, as well as linear bearings, aren't they?
When you put on and tighten the belts it would be even less likely I think.
Just some thoughts.
Solidoodle 4
Re: Circle Calibration
need this topic merged with the other already huge similar one
Solidoodle 2 with Deluxe kit cover & glass bed with heater. and 2nd board SD2 used not 3rd and alum platform not installed yet still wood. also need cooling fan installed to board. use Repetier Host couple vers. Slic3r also have all free ware STL programs