2020 Extrusion Drill and Tapping jig Set
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A pair of jigs to assist when tapping and cross drilling 2020 aluminium extrusions
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This is a pair of jigs to assist when tapping and cross drilling 2020 extrusion for blind corner fixing of Voron or similar framework.
The DrillTap jig goes over the end of a piece of extrusion. The tapped hole on the end aligns an M5 taper or second tap square to the central hole to allow hassle free hand tapping. Don't forget a little tapping fluid or grease to ease the tap. Aluminium is notorious for sticking to cutting tools. De-burr the tapped hole with a sharp 6mm or larger drill so the end of the extrusion will sit square to the vertical component.
The cross holes in the DrillTap jig locate the 4mm hole position 10mm from the end of the extrusion.
The DrillJigSupport model can be slid down the extrusion so the whole lot sits square on the drilling table when drilling the cross holes.
I printed mine in Red ASA because that's what was loaded in the printer at the time. The M5 thread seemed to hold up when for the 20 holes I had to tap, but it was getting a little sloppy towards the end. PLA would probably hold the thread better. A fancy M5 brass heat insert would be an improvement but a bit overkill for just a few holes.
Summary: Handy for a short run of tapped and cross drilled holes. Print another one for the next job
I've included the FreeCAD (FreeCAD version 1.1.0 RC2) model so you can tweak and remix to your heart's content. You will need to add the FusedFilamentDesign add-on via the add-on manager, which produces the "teardrops" on the holes along with a couple of other nifty features
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