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Tuesday, 19 June 2018

M1K : NFD 02/06/18

That's more like it...

Adjudication report for M1K : NFD 02/06/18

No Errors found in your log

No Reverse Errors found

QSO Error rate = 0.0%

Average Error Rate for this contest = 1.94%

Ended up near the bottom though as operated fixed as moved from /P location while setting up :-(

cnc enclosure covers on part1

It's just a small CNC, will use for PCB milling initially.

Got the base (old kitchen unit shelf) and the frame fixed in place, got the sides one and the top will make it 1/3 close 2/3rds on a piano hinge. It doesn't have lots of room inside but doesn't really need to. I have this sound foam I will add to the sides. But I really just wanted to reduce the noise and contain the dust.



I'll add a perspex door to the front, I have a sheet (Ex.G3ZAY tnx), but it is a bit thin to self support so might make a wooden frame for it. I suspect a couple of carry handles to the base. The CNC will have a couple of rubber plates added so it is less prone to cause vibration.

Got the emergency stop switch (ebay for pennies), I will put that inline with the power cord (probably in a little box on the base) activating it will kill all power immediately, will add lights and a fan, maybe a camera too! Door interlock?

A 12V car vaccum will probably sit on top (rear) or side with the flexible hose going inside to the table for the swarf etc it will create. I might 3D print a hose holder and nozzle. The PCB is bare right now,, no cover, I might leave it like that but might be prudent to cover it too.

ALL the sides can be taken off as are held in place with four 6x3.4" screws as can the frame, so if need to get to stuff I can.

In two minds if I paint it at all.

The CNC doesn't have any limit switches but it could and the PCB does support them so will be looking at if need those. I have checked and if the CNC goes off the end of one direction X,Y or Z the motors turn but don't jam, not sure if that is a good thing or not.

I expect I could RAMPS/Arduino CNC shield convert this at some point in the future but for now it will be USB cable driven. GRBL control so either something bespoke or I like Chillipepr.

I suspect one item I'll need to add will be a jig for double sided milling.

Saturday, 16 June 2018

enclosure for mini CNC

Just rough right now... got to rethink that bottom left corner. Might be fine one the sides are on.





Got plenty of plywood for the sides, base will be a bit thicker.

Working out adding a small LED strip, vaccum hose and emergency on/off switch. Front will eventually have a door.
Not the quietest of machines when milling pcb.

The spindle is c80W so that looks like the weak point, got a few ideas for alternatives. Might not be controllable off the PCB though.

Yes will be milling PCB with it. Max size about 250mm x 180mm

Sunday, 20 May 2018

Enclosure for the 3D printer and 3D CNC

As seen a few heating/cooling issues when using ABS as opposed to PLA filaments decided to box up the 3D printer. Will also box up the 3D CNC but that is for sound proof reasons.


The frame is held together with the same 40mm screws the insulation boards are held with. The little wood blocks help with the frame being square.


The access door will probably be on this large side panel with the longer side board on the left. Which I'll cut out. The door I will likely rebate into the foam.
I'll keep one side board longer that the other on top as the board will just butt up to it. And will add the top later.
Looking down inside, important the blocks are NOT hindering the floor etc. As the printer will be just lowered into this once built.

Will add a door on the facing side, space to store the filament (will need an extra box added internally), cooling and cable entrances etc. I use  a Meanwell type 24V 10A PSU to power this so that will probably sit on top, I'll add some ventilation and a small 12/24V fan for the electronics. The top will be another piece of board with access to the filament storage. Maybe top will have a bit of wood on one side as I'll add an emergency ALL STOP button to the top. Internal lights some goose head LED things I have already.  The base is some odd bit of chip board I had in the workshop, cut to fit, frame, some 15mm square section I had and the insulation is 25mm insulation board with aluminum foil backing (cellotex is common brand name). The sheets were attached with some 40mm plaster board screws, as the boards are Aluminium foam backed, the screws hold the boards in place nicely. I had parts of sheets spare so they were applied to this. The dimensions are to fit the printer and bits... was originally a K8200 in case interested.

The jury is out if there is any point painting this as I don't care what it looks like outside.

Once built will have a place on the workshop bench and I expect will be less vulnerable to being used as a dump ground for projects.

I have a part built 3D object scanner and I might see if I can fit it in side. If I do that the insides will be sprayed Matt Black, I have some chalk board paint. Or that will get it's own enclosure too and sit on top of the printer.

The 3D CNC will use  (mocked it up first) 15mm x 25mm wooden frame, covered in 8mm ply (again was in workshop), the door will use a piano hinge I have and one whole side will open. I expect will line the box with sound reduction foam and the printer will sit on 25mm (at least) rubber blocks (cut from old mouse mats and drive shipping pieces)  so that the sound of PCB milling doesn't send one nuts. It is much smaller but will build with a 500mm width base I expect. Internal storage for CNC 'bits', I'll add a vacuum hose and LED light same as 3D printer.

Tuesday, 15 May 2018

IOTA 2019

Maybe a QTH for July 2019.

Call would be MD1K

Tuesday, 8 May 2018

CNC plotter from DVD

Just played with few old DVD had been given.

Once stripped the guts to the centre frame and stepper drive connected up to Arduino CNC shield.

DONT do what I did and pull off the connection on one of the stepper motors.

Donor DVD, old Woodpecker 3.0.2 board (faulty).

The sharp eyed in the last image might see an HP ESP120 and some bits for a W6PQL SSPA and some R3KO bits I am building for another.


Friday, 4 May 2018

A 3 way 1kW switch for < £20?

Ok this I had to see after it had been mentioned to me so I bought one.

https://www.ebay.co.uk/itm/CB-Radio-COAX-Antenna-SWITCH-Compact-Metal-Housing-Ancable-1000-Watt-3-Position/202298988520


just opened it... you have got to be kidding! I used a phone camera and have a problem transferring images but I'll add them soon.




Zero manufacturers markings.

Couple of videos..


I think mounting might be interesting..

https://youtu.be/557BjcO03zI

I'm a qrp op but there is no way you could put probably 100W though one of these.

I will put it on the analyser and see how it does.