Heated Bed bowing (doming)
Posted: Tue Mar 03, 2015 2:13 am
Hey guys. So I've been having trouble with builds where parts extent out toward the edges of the build area. Specifically, I can't seem to keep anything stuck down out there, and adjusting the Z yields a really close proximity in the center and a situation where the first bead seems too thin (see through). At first I thought the problem was my glass being bowed but after measuring the heck out of everything with a dial indicator, i can see the source is actually the heater plate itself.
Each measured set starts with 0 calibration at center. Negative measurements in the corners or along the edges indicate a surface that is closer to the table, whereas positive numbers represent measurements toward the sky. I measured each corner and each center of any given rail.
Glass Side A (center high)
[-0.011].......[-0.005].......[-0.010]
[-0.005].......[0.00]..........[-0.002]
[-0.007].......[-0.002].......[-0.006]
Same glass, side B (center still high)
[-0.011].......[-0.008].......[-0.010]
[-0.005].......[0.00].........[-0.003]
[-0.008].......[-0.003].......[-0.008]
Heater Plate alone (no glass, much more significant bow with center high)
[-0.015].......[-0.010].......[-0.011]
[-0.006].......[0.00]..........[-0.002]
[-0.014].......[-0.008].......[-0.012]
Granted, you can see that I am not "perfectly" leveled but in most cases you can see the bow by averaging the extremities along any given axis and comparing that value to the center.
So my question is, what are you guys seeing on your plates? Would this deviation (maximum 0.010 of the glass) be significant enough to cause the lower bond to the glass that I am seeing on larger builds, or something well within working range?
Each measured set starts with 0 calibration at center. Negative measurements in the corners or along the edges indicate a surface that is closer to the table, whereas positive numbers represent measurements toward the sky. I measured each corner and each center of any given rail.
Glass Side A (center high)
[-0.011].......[-0.005].......[-0.010]
[-0.005].......[0.00]..........[-0.002]
[-0.007].......[-0.002].......[-0.006]
Same glass, side B (center still high)
[-0.011].......[-0.008].......[-0.010]
[-0.005].......[0.00].........[-0.003]
[-0.008].......[-0.003].......[-0.008]
Heater Plate alone (no glass, much more significant bow with center high)
[-0.015].......[-0.010].......[-0.011]
[-0.006].......[0.00]..........[-0.002]
[-0.014].......[-0.008].......[-0.012]
Granted, you can see that I am not "perfectly" leveled but in most cases you can see the bow by averaging the extremities along any given axis and comparing that value to the center.
So my question is, what are you guys seeing on your plates? Would this deviation (maximum 0.010 of the glass) be significant enough to cause the lower bond to the glass that I am seeing on larger builds, or something well within working range?