These are the parts I designed for a project with my son. Just wanted to give something back to the community that providet detailed instructions for the electronics part of the project. You will need to adopt/redesign some parts to fit your handle and pipes. I designed the telescopic mechanism so that me and my son both can use the detector. So far I am pretty happy with the result and the performance. Kids had much fun digging in the garden for metal.
If you are interested in more details obout this metal detector just google for "metal detector pirat" or visit this russian site on the VK social network: https://vk.com/metalloiscatel
You will need to print a bolt + nut to connect the coil housing to pipe. Just customize one thing to be about 12mm diameter and 80mm long (e.g. https://www.thingiverse.com/thing:193647 )
I also suggest you use super glue to glue in the nuts into corresponding sockets. Bute make sure no glue gets into the thread. Spool housing is meant to by assemled by zipties.
Some notes on the parts I have used:
-handle from a forearm crutch
-EN16 and EN20 pipes for electric installations
-M3 bolts and nuts for connections
-Layout 2 PIRAT board from the vk-group (see link above)
-speaker from a musicman mini
-mini digital voltage display from eBay
-4x2xAWG24 solid copper core twisted-pair-cable for coil
-8x AA 1.5V Battery Pack (12V)
I will post some more pics and infos in the makes.
0.3mm (0.2 for smaller parts)
You'll need to remove some support material e.g. on spool halfs or free some holes that were closed by thin material walls to improve printability.