Round 8 mm Magnet Hole Tolerance Fitting Gauge
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Tool to determine the correct size hole needed to hold small round 8 mm diameter magnets.
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Information
It seems when you order 8 mm magnets of specific sizes, they sometimes are not completely in spec. In most cases the magnets are usually slightly less in all dimensions than their advertised sizes. That's why I developed this tolerance fitting gauge to help in designing the right size magnet hole needed for use in my 3D printing projects.
The gauge is specifically designed for variances in 8 mm diameter magnets with a depth range of 1.50 mm to 3.50 mm (in increments of 0.5 mm), and a diameter range from 7.80 mm to 8.20 mm (in increments of 0.05 mm). This should (hopefully!) accommodate magnets advertised as either 8 mm x 2mm or 8 mm x 3mm in size.
Please note that if you don't wish to print the whole gauge you can simply use your slicer to cut off the hole dimensions you don't need. This will decrease waste and improve printing time.
Directions
Recommend you print this gauge in the same filament material and slicer settings you'll use to print the model which will house the magnets. Once printed take a magnet and push it into the holes to see which depth and diameter size is best for your needs. Choose a size with less tolerance for a good press fit, or one with more tolerance if you're going to drop in the magnets or glue them in.
If a magnet gets stuck in a hole use an Allen key to push it out through the small hole in the back.