Calibration Block with Countersunk Hole and Slot
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Published on June 12, 2012
Derived from
Makerbot Calibration set
by Spacexula
Description
Calibration Block with Countersunk Hole and Slot to catch problems with elements inside perimeter of object.
Instructions
I took the 20mm block from Spacexula's calibration set and added a countersunk screw hole for a M3 socket-head screw, and a slot for a M3 nut to be able to check my bots ability to accuratly do inside holes and slots in an object.
Edit: (from algspd's comments below, I updated the object to use values that should produce a snug fit, the old values were the nominal diameters for an M3 socket-head screw)
The head diameter is 5.89mm and the shaft diameter is 3.06mm, this should produce a snug fit. I created this calibration block to test the accuracy of the inside diameter of a hole on a Printrbot Plus, from a SketchUp file.
Edit: (from algspd's comments below, I updated the object to use values that should produce a snug fit, the old values were the nominal diameters for an M3 socket-head screw)
The head diameter is 5.89mm and the shaft diameter is 3.06mm, this should produce a snug fit. I created this calibration block to test the accuracy of the inside diameter of a hole on a Printrbot Plus, from a SketchUp file.
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License
Calibration Block with Countersunk Hole and Slot by TechnoSwiss is licensed under the Attribution - Creative Commons license.
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CAUTION!!! The hole is not M3, it is smaller, i wasted a lot of plastic trying to calibrate my printer with this.
DO NOT use this to calibrate your printer.
I've got a pile of these I've printed out, and I just double checked the SketchUp file, it is most DEFINITELY an M3. I did however set the whole sizes to exactly the nominal dimensions for an M3 screw, so it's going to be really tight. I should probably use standard clearance values instead of nominal values, sorry.
I did have to really play with my Printrbot to get it to actually print the dimensions given in the object, which is the reason for creating this calibration block in the first place.
I'll update the file and the Instructions, thanks for info.