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Old 16-07-2014, 11:35 PM   #1
moonhugger
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Default 44" Leg Pods

I will be away for a couple of weeks on my Hol's.

Thought I might leave a teaser / sneak peak of the next parts I will start.
Whilst continuing to finish my Passenger Pod and if I am honest; putting off producing the brass items for the Passenger Pods. Stick to what you know!

So, I made a couple of mistakes with the Passenger Pods - I use CAD, but for the PP's I just draw up the elevations in 2d, programmed and cut. RichardL was my checker but I was too far in to change; the errors I can live with.

This time I have 3d CAD on the go. I can print out elevations and offer up to the plans. Do my own checking!

The elevations from the 3d CAD (or even the 3d data) can be used to program the machine.

Maybe the idea is over engineered, but these will take full load of the model (what does the average model come in at?).

Need to decide, MDF or Styrene. Both easy to cut - wont bother with polycarb / Perspex. I am swaying towards MDF but must find better quality, I like the ease of gluing.

The only downside of the design - chamfering the panel edges!

Hope you approve. Might even have some feedback for when I get back.

Best Regards

Julian
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File Type: jpg LP1CAD.jpg (107.2 KB, 83 views)
File Type: jpg LP2CAD.jpg (74.9 KB, 43 views)
File Type: jpg LP3CAD.jpg (121.0 KB, 38 views)
File Type: jpg LP4CAD.jpg (121.9 KB, 16 views)
File Type: jpg LP5CAD.jpg (130.7 KB, 52 views)
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Old 19-07-2014, 06:05 AM   #2
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Default Standing on the Shoulder (Pods) of giants....

This all looks terribly impressive Julian - cannot advise on which is the better material but they will both have their strong points. Once again, a great variation on a modelling classic - looking forward to seeing all of the pieces beautifully measured and cut as always. Will weigh my components upon my return home but, in fairness, there's no brass used in the cage and spine. It is a lightweight design - it simply had to be.

Hope you have a great time on holiday,

Kindest regards,

Patrick
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Old 19-07-2014, 11:39 PM   #3
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Default A weight off my mind....

Julian:

Spine, forward cage and walkway, rear cage and walkway, Command Module and tail section: 1.6kg

Shoulder pods: 0.25kg each x 4 = 1.0kg

Total weight minus passenger pod = 2.6kg

Don't be misled - she's constructed out of lightweight materials, but hopefully this'll be of some use.

Got the rogue hex, the kit's at the sorting office awaiting collection.

Kindest regards,

Patrick
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Old 03-08-2014, 06:58 PM   #4
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Default

Thanks for the weights (Mass) - actually lower than my expectations.
Richard; thanks for the link. I might/will consider a rethink, Bernie has used thinner material and less upright supports in the main body whilst retaining high strength. I can over engineer most things.

I think I will get some styrene in for these; will save on the surface finishing!

In my design I am considering making the pod support as part of the machining, is this a good idea? Is there a benefit to keeping a separate support tube? Less droop at centre probably? Easier to build (I was even thinking of building leg pod pairs and building the cage around it)?
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Last edited by moonhugger; 03-08-2014 at 07:54 PM.
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Old 03-08-2014, 09:54 PM   #5
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I could go with the aluminium bar.
I was thinking the left and right front as one piece when bonded together, same for the rear; fit the walkways and then fit the brass around - some sort of hidden fixings in the cage?
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Old 03-08-2014, 11:10 PM   #6
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Default Pods,prongs'n'pros and cons.....

Hi Julian, hope you had a terrific holiday. Will be posting on other matters soon but, in the meantime....

Interested to hear you talk about the central spar connecting the pods - you'd end up with a really sturdy construction. I followed the traditional method, and intend to keep the pods detachable (what if I have to take her somewhere?). So far I'm really glad I do have detachable components - helps with storage, handling and so on. As Richard's already said, it's your project but no matter what route you follow, we'll be watching closely, looking for inspiration and top quality construction techniques in equal measures.

Kindest regards,

Patrick
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Old 04-08-2014, 12:42 PM   #7
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Hi Patrick, I will need to think about the construction, not sure yet!
The holiday was great, took the kids to Disney ( great for them but hard work!) did come across some very nice model making, and some nice retro stuff.
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Old 12-08-2014, 08:19 PM   #8
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Default A start...

I have run the router up to do some test cuts. Bit of movement on the thin side wall - will use a stronger tape to hold down.
The jigsaw fitting is ok, sizes are good. Need to remove the corner radii though. Boo...
I haven't got any styrene in, will carry on with MDF, I have 3 sheets in the garage and I think they will flat down easily enough after a bit of sanding sealer.
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File Type: jpg Mill2.jpg (64.4 KB, 35 views)
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Old 13-08-2014, 08:01 AM   #9
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Default A cut above the rest.....

Julian, that looks very, very good indeed. Fine tolerances and precision cutting win through in the end. This bodes really well for the next stages in the shoulder pod design and, once again, must make you more optimistic about building your very own 44" Eagle!

Keep posting now,

Kindest regards

Patrick
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Old 11-09-2014, 11:57 PM   #10
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Default Help...

Ok - started cutting non critical leg pod parts. But looking at plans the "front" and "Rear" Boxes have holes for the leg pods that are larger than the "prong" on the pods.

What am I missing here? Should I make prongs bigger or holes smaller? Or add an additional part?

On the plans the prongs are 30 x 13mm and the holes 40 x 17mm (I know a purist would be in imperial!)

Thanks in advance

Julian
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Old 12-09-2014, 07:54 AM   #11
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Thank you Richard.
Must check the plans further!
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Old 12-09-2014, 09:18 PM   #12
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Default Brace yourselves......

Assignment submitted, exam not for a month or so...would be a shame to not do a bit.

Internal braces; lovely things, not a every efficient way to make leg pods but fun. It will be a shame to hide them. Yes these are for just 4 leg pods!

Julian
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Old 13-09-2014, 08:17 AM   #13
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Hi Richard.

I was tempted to swap down to 2mm after you directed me towards Bernie's similar solution - all 2mm and less of it.

I am sticking with the 3mm MDF; just because I have done the work! This is not a viable solution (maybe with laser cutting) for garage kit builders, but almost.
I wonder if a mixed resin and flat cut sheet is the better; just mould top and bottom and cut the sides / prong / details. Easier to tool, less silicone used, easier to demould and the tools might last longer. Not that I will do this (probably - I like the idea of making the masters, just to do the 3d milling)

Julian
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Old 15-09-2014, 04:40 PM   #14
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I think your solution has it's merit too Julian. It would be very cool if you could mount the prong from either side giving the option of left/right/ and front/rear from one kit. 2mm styrene in my protoype was amazing strong, I could stand on it. It would be better to use acrylic sheet for the skins as the original builders did, dib dab with body filler and wood sticks to plastic, filling the edges and you could sand them to a knife's edge sharpness if you wanted to.

This is full of possibilities.
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Old 15-09-2014, 11:02 PM   #15
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Quote:
Originally Posted by Captain Sci-Fi View Post
I think your solution has it's merit too Julian. It would be very cool if you could mount the prong from either side giving the option of left/right/ and front/rear from one kit. 2mm styrene in my protoype was amazing strong, I could stand on it. It would be better to use acrylic sheet for the skins as the original builders did, dib dab with body filler and wood sticks to plastic, filling the edges and you could sand them to a knife's edge sharpness if you wanted to.

This is full of possibilities.
Yep - what Bernie said - that is the way to go.
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Old 15-09-2014, 11:25 PM   #16
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Thanks guys.
The design can be flipped over in both directions, I can make the four corners from 4 identical sets of parts.
If it wasn't for the 3d work I do; I sometimes wonder if I should have bought a laser cutter; this stuff would be easier, and just as easy in acrylic!

I have the enviable task of working in LA all of next week; another chore (working as an engineer overseas is not as glam as some think!) stopping the model making - it might be a couple of weeks before I do anymore.

Julian
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Old 15-09-2014, 11:58 PM   #17
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We'll be right here when you get back, if you need laser cutting I am your man, let's chat when you get back.

Good luck and don't forget my postcard.
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Old 17-09-2014, 08:05 PM   #18
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Default Hidden soon but never forgotten......

Well, should be packing but.......

Happy so far!
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File Type: jpg Inner Structure 3.jpg (84.2 KB, 22 views)
File Type: jpg Inner Structure 4.jpg (97.0 KB, 37 views)
File Type: jpg Inner Structure 5.jpg (67.6 KB, 39 views)
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Old 17-09-2014, 11:45 PM   #19
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Originally Posted by moonhugger View Post
Well, should be packing but.......
Happy so far!
Looking very good indeed. What are you planning to clad the outside of the pods with? and is it accounted for in the frame dimensions?

Best Regards,
Purple Bob.
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Old 18-09-2014, 07:45 AM   #20
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Default Really, really impressive.....

.....all of this is really fascinating - it's all so accurate, and all fits together so well. You're a clever guy, Julian! Keep us all posted now,

Kindest regards

Patrick
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