Cutting a hole for spar in EPP

[ZoomNBoom]

I have to cut some long holes in an EPP wing for a spar. Like the one on the bottom:



but then in the one on the top. Anyone have suggestions how to do this best? Im thinking a sharpened copper tube, perhaps heated ?

 

[William A]

Does it have to be a hole ?, how deep/long ?

I've done grooves with no problem to go long lengths but holes are another story.

 

[Snarls]

Hey Zoom, check out this video for two techniques. A sharpened copper tube and a drill looks like a good choice. I do remember seeing a video once of a method that involves heating a metal tube up and then quickly sliding it along a track into the wing the melt in a hole. I'll update this if I find it.

 

[ZoomNBoom]

yes, has to be a hole, 6mm wide, ~20cm or so should be long enough. Groves would be easier to make for sure, but Im trying to take advantage of the spare already in the inner section of the wing and I also want to route wires through it and have the tube act as RF shielding.

 

[ZoomNBoom]

Thanks snarls, that video was precisely what I was looking for!

 

[Snarls]

Glad it helped. Still can't find the video that uses a heated rod, but you can just imagine the drill technique, but using a heated rod instead of a spinning drill.

 

[ExperimentalRC]

Glad it helped. Still can't find the video that uses a heated rod, but you can just imagine the drill technique, but using a heated rod instead of a spinning drill.

I think I remember seeing Daniel from rctestflight do that but I can't find the video where he did it.

 

[Snarls]

I think I remember seeing Daniel from rctestflight do that but I can't find the video where he did it.

You are correct! Here is said video:

 

[William A]

Hey Zoom, check out this video for two techniques.

That jig he made for the drilling technique is awesome.

I probably would of had a better outcome over trying free hand.