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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: Geoff's Jet Provost - Build Log
21/01/2020 15:18:49

Top sheeting added.

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More later...

20/01/2020 21:39:22

Hi Steve.

Your Provost looks great - hope mine turns out as good!

I find the SLEC building board really good, it's stops me building banana shaped fuselages. I have mine stuck to an off-cut of kitchen worktop.

Few Pics from today's tinkering:

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Lots of shaping and sanding next...

20/01/2020 16:59:42

Hi Barry.

I am working with the free plan that came in the magazine.

The programs that I use are all available to download for free (I use mac versions):

Inkscape - for tracing out parts (I use the bezier curve tool)

J Tech Photonics laser tool - an extension that you load into Inkscape which produces the gcode.

CNCjs - for sending the gcode file to the laser cutter.

If you have a look at my Oodalally build log here, I have gone into a bit more detail.

The only difference here is that I did not have a PDF of the plan to start with so it was a case of scanning each part from the plan. One thing to note is that Inkscape works in a resolution of 72dpi. So you must scan at that resolution otherwise the scale will change (ask me how I know angry).

Hope that helps.

19/01/2020 21:19:13

Made up the thrust tube and hot glued in the fan.

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Added the bottom sheeting. I will steam the front bit to get the slight curve required.

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More later...

17/01/2020 20:29:12

Bit more done today.

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More later...

16/01/2020 20:27:26

I have the Vac form bits for the Gnat, Hunter and Provost. I also have three FMS fans. So after much deliberation I have decided to start with the Provost.

I have cut out the parts using my Laser/CNC cutter.

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Glued the wing sections together.

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Started on the fuselage. For some reason they cut 10mm too short on the X axis, I may need to check calibration of my stepper motors.

I chose to splice a 10mm strip into each side rather than re-cut them both.

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I cut former 6/7 as a single piece then cut out part 7 and tack glued it back on. I am not sure how useful this will be if I need to replace the fan at any point because the hatches are all in front of the fan - so you are still going to need to hack away a portion of the fuselage, at which point you could probably loosen the hot glue securing the motor and pop it out the front of the former.

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More later...

Thread: Home Made CNC/Laser Cutter
14/01/2020 12:04:58

Hi Adrian.

I have the pwm/ttl from the laser connected to z+ (end stop) on the cnc shield.

Power for the laser is taken from the cnc shield. I initially used the psu that came with the laser but this didn't work because both laser and shield need to share the same ground, and I found that the laser would just stay on.

Hope that helps.

Thread: Forum 2020 Mass Build discussion.
07/01/2020 14:13:56

I have all the bits for the Provost, Gnat and Hunter.

Just need to decide which one to start first.

Thread: Oodalally - Build Log
04/01/2020 22:27:59

Sods law - weather looks ok tomorrow but I have others things that I have to do angry 2

It has been a very enjoyable build and went together quite quickly - thanks Peter for the design.

04/01/2020 12:57:10

Better lighting.

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03/01/2020 22:44:16

Hi Gary.

I used Adobe Photoshop to design the scheme and Silhouette Studio to send the files to my cutter.

Set up the CofG this evening. It balanced with moving the battery - no extra weight needed.

Flight report next, pending some fine weather.

03/01/2020 18:16:02

I have just done some measurements which are as follows:

Motor - E-Flite Power25 870Kv

Battery - (a rather large) Zippy Compact 6200mah 4 Cell Lipo

All up weight including battery - 2.16 Kg

Prop - 11x7

Power - 750 W @ 48 A at full throttle.

02/01/2020 12:24:01

Tis done...

Bit of a gloomy day but here are some pics.

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Just need to set the CofG and wait for good weather.

01/01/2020 20:10:51

Thanks gents. I'm nearly there!

Fitted the ESC and SBEC.

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And sploshed a bit of paint on my 3d printed pilot.

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More later...

30/12/2019 21:24:41

Bit more done.

Cut some vinyl decals with my silhouette portrait cutter.

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Glued on the tailplane.

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Added an infill piece between the elevators.

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Added some carbon tube and glued on the fin.

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Made a windscreen and printed a pilot.

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Added some exhaust stubs.

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More later...

Thread: Which Laser cutter
16/12/2019 16:11:51

If you have a dremel you can build one of these and have the best of both worlds.

Thread: Cheap Chinese Laser Cutter
15/12/2019 18:38:20

I have installed an extension into Inkscape called - J Tech Photonics laser tool (free download).

This produces the G-Code to send to the laser via CNCjs.

15/12/2019 11:12:37

Hi Andy.

Are you powering your laser with a separate power supply. If so, you need to make sure they share the same ground connection. I had similar issues with mine which I fixed by powering everything from one power supply.

Hope that helps.

Edited By Geoff Gardiner on 15/12/2019 11:14:36

Thread: Oodalally - Build Log
13/12/2019 21:23:43

I covered the cowl today and sorted the battery hatch, with the aid of my 3d printer.

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More later...

11/12/2019 19:50:29

Thanks Chris.

Working on the fuselage today.

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More later...

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