CRX Rotary - 6th Annual BLF/ Old Lumens Contest Winner

Wish you a speedy recovery CRX!

In case of more severe wounds there's some good advice from Mr. John Rambo ;-)

:+1: Good to see you start. Reducing metal diameter with sandpaper sure is tedious. :beer:

Hi CRX, I’m very curious about your next beauty.

Ouch, hope it doesn’t hurt as much as it looks.

Looking forward to seeing the awesome build.

I’m looking forward to this too. Your creations never disappoint! :crown: :+1:

Looks interesting, nice to see you enter. :slight_smile:

It appears we have the exact same caliper.

Preparing the outer & inner core copper tubes to fit together.

I started off with two hours of fun, freehand filing some copper tube to reduce the diameter of the smaller tube as I want them friction fitted together.

The larger 21.96mm OD x 20.40mm ID copper tube is a cutting of plumbers pipe.
The smaller 21.22mm OD x 18.98mm ID tube, a comrade sent to me last year.

This tube needs to be reduced in diameter to fit inside the other.

Tube measurements prior to work:


Outer tube - Outer Diameter - 21.96mm
Outer tube - Inner Diameter - 20.40mm
Inner tube - Outer Diameter - 21.22mm

I filed evenly around the inner core tube using a hand file to reduce the diameter by about 0.84mm.


Pro Tip: Do not use left hand as filing guide Inner tube filed down, sanded, light polish and a comparison to an unworked tube.

Tube measurements after work:


Outer tube - Inner Diameter - 20.40mm
Inner tube - Outer Diameter - 20.38mm
Inner tube - Inner Diameter - 18.98mmNow we have two copper tubes fitting nicely together.

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NC would still burn even after being soaked with blood?? Naaah.

Worst I ever did was sear off all the hairs on my forearm when I let a flame get a little too close to an “empty” bottle of IPA. Heard a nice slow “fwoooosh!” and… no more armhairs!

Ever since, I could never recreate my (unintentionally) improvised jet-engine.

That file was a real Bastard. :stuck_out_tongue:

Looks good! No doubt the finish product will be top quality.

True :laughing:
Before people mark you rude for sweary… File Types.

^ fun read. Barstead?

In NL we have “bastard sugar” (basterd suiker) which is a mix of fine and coarse grains of sugar.
The brown variant is most popular, it has some syrup / molasses mixed into it.

I recently had a mysterious bastard file on my SD card…
Very strange. 0 KB size mp3 file, and i had ‘no permission’ to delete it either…
So i deleted the folder it was in.
But that only worked after re inserting the SD card and not opening that folder first !!
Very odd… I suspect it was attached to some GIF i downloaded. Not sure. Weird…

Anyway, looking forward to more pics and progress of your build, CRX. :beer:

Making the copper pill.

Filed down a scrap piece of 20mm copper bar and brass ring to 18.92mm.

Parts soldered together.

Soldered the parts together with some copper sheet insert and copper wire using a dual flame jet lighter with the parts placed on a ceramic tile with solder paste in the joints.Cleaned up with wire wool, sandpaper then metal polish.

First a scrub all round with coarse wire wool then a rub on some 800 grit sandpaper, keeping the face flat down to finally a polish on some old newspaper with a dab of liquid polish on it.

Cleaned up.Showing the pill inside the inner core tube.

This will eventually be cut to shape and fixed in place. Showing preliminary core flashlight parts.

This is an old reflector used for checking fitment only.Pill inside inner core inside outer core with MCPCB & reflector in rough positions.

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C.R.X.
Copper Rubbing X-cellence. :slight_smile:

:sunglasses: :+1:

I like how you simulated wood grain in the copper surface. :person_facepalming:

CRX is over-the-top with his sanding and polishing. I’m not that patient. :weary:

I’m sure this will be amazing as per usual for CRX. :slight_smile:
Where do you get your copper from?