CNC milling / carving copper PCB

I’ve got best results milling the PCB with this kind of tools:

Näyttökuva 2015-9-21 kello 21.56.59

You can find them on ebay with words “Carbide PCB Engraving Bits CNC Router Tool 90 Degree 0.1mm”.

My settings for PCB-GCODE are:

Depth 0.1mm
Tool size 0.25mm

Näyttökuva 2015-9-21 kello 21.49.07

In eagle’s DRC / DRU I usually set the “sizes” tab “minimum width” to 0.8mm, but with carefull positioning of the clad I have achieved 0.4mm minimum widths.

Naarmuton, a 180 size FPV quadcopter

Self milled from 2mm thick carbon fiber sheet.

Motor: RCX H1306 3200KV Micro Outrunner Brushless Motor (Performance Racing)

 


Motors, ESCs, PDB, power connector total137gr – 35gr = 102gr 


First flights without FPV, weight with battery 264gr:
Final setup with FPV capability, 230gr without battery and 302gr with 950mAh 3S battery. The FPV setup (camera + TX) added 32gr weight):

 

PID tuning

Really hard. Either the carbon fiber resonates or some motors are unbalanced. However with these PID values I got somehow decent full throttle:

Näyttökuva 2015-8-22 kello 14.29.39

 

I used betaflight with these new filters:

set gyro_cut_hz = 40
set pterm_cut_hz = 30
set dterm_cut_hz = 12

.. But returned back to defaults.

   

  

M.O.S.K.A

 


Background

This is my version of a carbon 250 quad. It’s based on Hammer v 3.0 plans (big thanks!) but I have made some modifications that suit my taste.

The carbon pieces are self milled on 1.1mm carbide tool. 16.200rpm, 0.5mm layer, 210mm/min.

Arms

Each arm weights 10.1gr. Thickness 2.91mm. Modified from Hammer arms; removed that suddenly narrowing shape (weak point) and made it “evenly breakable”. They are still 100% compatible with the original Hammer design.

683893d24155c39f59aa9237de0713e1image


Body

The two identical base body plates weighted 23,8gr each. They are 2mm thick carbon fiber.

Motivational assembly! 100gr total at this point.


 

DXF’s of arms and base body

Spacers (stl) and upper deck (dxf)

First carbon fiber milling: Akroquad – a 210mm quadcopter

Frame: Now available for purchase! (25.3$)

Suggested setup:

Motors: http://www.myrcmart.com/rcx-h1407-v2-3800kv-micro-outrunner-brushless-motor-its-time-to-upgrade-your-1306-motor-p-9350.html

ESCs: http://www.banggood.com/4-PCS-Racerstar-RS20A-Lites-20A-Blheli_S-BB2-2-4S-Brushless-Motor-for-FPV-Racer-p-1105427.html?rmmds=category

PDB is a good plus but one can solder the leads together

Radio+receiver: https://hobbyking.com/en_us/fpv-racer-radio-mode-2-black.html

Props: 5″ 2-blade, for example: http://www.banggood.com/2-Pairs-Gemfan-5030-Fiberglass-Nylon-Propeller-For-250mm-Quadcopter-CWCCW-p-976118.html?rmmds=search

Battery: 850-1000mAh 2S

Quick FPV-addon (cam+video tx) : http://www.banggood.com/FX-FX798T-5_8G-600TVL-25mW-40CH-Mini-Transmitter-Camera-Combo-For-FPV-Multicopter-p-1053038.html?rmmds=search REMEMBER TO PROTECT THE ANTENNA!

Goggles for FPV: https://hobbyking.com/en_us/quanum-cyclops-v2-fpv-goggle.html

 

 

 

http://youtu.be/ANLsP0864wI

All body parts: 16.1gr

 

 

250 racing quad

 

 

Adding damped Mobius-platform

1300mAh 3S fits just fine..

 

But 1800mAh 4S doesn’t..

Let’s remake the platform, now it fits! (flying weight with battery+mobius 585gr, without batt+mobius 354gr)