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Member postings for Geoff Gardiner

Here is a list of all the postings Geoff Gardiner has made in our forums. Click on a thread name to jump to the thread.

Thread: Oodalally - Build Log
07/11/2019 15:17:47

Bit more on the wings:

Sheer webbing going on

img_4490.jpg

Leading edge.

img_4493.jpg

The rest of the wing sheeting.

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Second half of the wing under construction.

img_4496.jpg

Sheer web going on the second wing half and L.E. cap strip going on the first wing half.

img_4499.jpg

More later...

Thread: Cheap Chinese Laser Cutter
06/11/2019 19:57:01

Hi Chris.

Looks like you have the same laser that I have got - is it a 5w?

Are you powering the laser from a separate power supply to your control board?

I had similar issues with the laser staying on when powered from the supplied PSU. You need to make sure the laser and your 'laser box' share the same GND (-ve). I ended up ditching the PSU that came with the laser unit and powered it directly from the 'original laser box' and everything then worked fine. Hope that makes sense.

Thread: Oodalally - Build Log
06/11/2019 13:02:28

Very true KC, but where's the fun in that wink

06/11/2019 10:11:08

Thanks Chris.

I wondered that myself, which is why I built my own laser. Even if I don't use it much, I have had a lot of fun building it and getting it to work.

05/11/2019 22:15:17

Bit more done on the wing today:

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More later...

05/11/2019 20:46:59

Hi Christophe.

I built the machine myself, printing parts for it with my 3d printer. See here for details.

It also will hold a dremel for milling jobs - ideal for cutting thicker ply.

The laser unit is a 5W diode laser from BangGood.

Hope that helps.

Thread: Home Made CNC/Laser Cutter
05/11/2019 20:40:34

In Action.

Thread: Cheap Chinese Laser Cutter
05/11/2019 14:07:48

I use Inkscape which allows you to set the M4 command.

Have a look at my Oodalally build log here, I have some pictures.

Hope that haelps.

Thread: Oodalally - Build Log
04/11/2019 17:25:35

Cut the fuselage sides and glued on the ply doublers today.

Also made a start on the wings.

img_4483.jpg

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More later...

03/11/2019 12:52:13

The g-code file is the loaded into a program calles CNCjs which controls the laser cutter.

cncjs.jpg

And the job is set going.

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And in next to no time we have this...
img_4482.jpg

More later...

03/11/2019 12:36:56

OK, so here we go with another build log!

I wanted something that would be suitable to take a 'B' test with and also something that would be a good first model to build using my Home-made laser / CNC cutter.

My first thought was The Ohmen, but decided on the Oodalally as it is a bit larger. Also, I have some 4s batteries that need a good home.

Having obtained a PDF version of the plan, the first job was to trace out all the parts that I would be laser cutting. For this I used a program called InkScape.

1.jpg

Each part was created on a separate layer, this makes it easier when you create the cutting files later.

2.jpg

Next, I created a new document in InkScape and set the page size to a sheet of balsa. Then I copy all the parts that will be the same thickness and lay them out on the page. I then produce a cutting path and using the J Tech Photonics laser tool (a 3rd party extension that I installed into InkScape), I produce the g-code file.

3.jpg

More later...

Thread: Cheap Chinese Laser Cutter
25/10/2019 21:26:19

I've been using a free program called CNCjs for controlling my laser.

24/10/2019 20:00:31

Chris, I have just been setting up my homemade CNC/Laser cutter. I am using Inkscape with a laser extension installed. This creates G-Code to send to the cutter (M03 to turn on and M05 to turn off). My first cuts were also burning at the corners - where the laser speed slows to change direction. I have found that if I use M04 to turn on the laser instead of the M03 command, then the laser power reduces when it slows and you don't get the burnt corners.

This may be of help to you.

Geoff...

Thread: Home Made CNC/Laser Cutter
24/10/2019 12:52:14

I have now fitted the laser to my CNC machine. Works a treat - just need to tidy up the cabling.

img_4480.jpg

Thread: Cheap Chinese Laser Cutter
20/10/2019 21:27:15

Hi chaps.

I have just added a 5W laser (diode) to my homemade CNC cutter. It uses G-Code and I can set the power of the laser, speed of movement and number of passes.

I have had a quick play but haven't really found a good combination of the settings yet. Full power tends to set fire to the balsa, lowering the power and adjusting the speed increases the number of passes required a lot .

It would be really useful for me (and others new to laser cutting) If people could share their laser settings

for cutting various types of balsa/ply thickness and what type (power) of laser they have.

Thanks in advance.

Geoff...

Thread: Tony Nijhuis Harvard - Build Log
14/10/2019 21:55:56

Doug.

Hope to get it up before next season but the weather here is pretty miserable, so will have to wait and see.

I just had a look at your Blog - it's looking good so far. Have you thought about a paint scheme yet?

Geoff...

14/10/2019 21:18:06

Thanks gents.

SR71 - The switch is the Hobbyking version (failover switch), similar to the Power Box one.

Adrian - Jury still out on that. I want to get hold of a 13x6 to test before I decide.

14/10/2019 15:37:48

Tis done!

Raining outside so took some snaps inside:

img_4451.jpg

img_4452.jpg

img_4453.jpg

img_4457.jpg

img_4458.jpg

img_4459.jpg

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Flight report when weather improves...

10/10/2019 13:09:08

All props in my previous post were APC props

Tested a couple more props today:

13x7 JXF (I think this might be an i.c. prop) 1180W & 60A

13x8.5 Master Airscrew Electric 1500W & 78A

09/10/2019 20:59:48

Power testing today:

14x8 prop gives 1700W & 90A

13x8 prop gives 1550W & 83A

12x8 prop gives 1250W & 65A

These readings were at max throttle.

More later...

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