Parametric Drill Guide for Z-axis Pipes Mostly Printed CNC

thingiverse

**8/5/2017 Update** I made Wall thickness & Base Thickness separate variables & fixed one bug. This design was created for use with the Mostly Printed CNC project, but it can be adapted for any round pipe that needs perpendicular holes drilled into it. Using this jig made drilling these pipes very easy. I used a 9/64" Drill bit for the holes. With some extra work on the openscad file, it could be modified to drill holes at other angles in the pipe. I did two test prints with different Outside Diameters (OD) - 24mm and 23.7mm. The 24mm print was a little too loose and the 23.7mm print was a bit too tight when assembling both halves together. To get a perfect fit, I used one side of 24mm and one side of 23.7mm to clamp it in place. Using 23.8mm as the OD for the pipe would likely provide an even better fit. Since I had printed two copies of this jig, I used the spare one to support the other end of the pipe while drilling. After finishing the project, I realized that a center point on the jig was needed to clamp onto, but a small piece of wood worked as a temporary solution. To address this issue, I updated the openscad file to include an option for adjusting the center clamp width. It's worth noting that the time spent clamping everything in place will be significantly less than the actual drilling process. I've included STL files for the standard 76.2mm hole spacing. You can also open and customize this design using Thingiverse Customizer, just like my Parametric Nut Trap model (http://www.thingiverse.com/thing:907882). Later that same day, I updated the openscad file to rev4, making some minor tweaks for consistency when users adjust the bolt hole sizes. However, I didn't update the sample STL files since the hole patterns remain unchanged.