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Micro Magnum, Team Magnum, NSW
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MoonSet416



Joined: 25 Sep 2016
Posts: 431
Location: Sydney


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Yeah they do. Did a few cad drawings in the past few days and designs with nutstrips instead of aluminum bulkheads definitely need time to get used to.

Post Sun Jan 28, 2018 11:56 pm 
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MoonSet416



Joined: 25 Sep 2016
Posts: 431
Location: Sydney


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Update:

Just realized that carrying both a featherweight and a sportsman at the same time from China to Sydney isn't really gonna work. (stupid me) So decided to jump onto the antweight train...

Started with some basic parts: N20 gear motors, 3D printed wheel with O-rings as tires.

Post Mon Jan 29, 2018 12:13 am 
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MoonSet416



Joined: 25 Sep 2016
Posts: 431
Location: Sydney


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Update:

My first ant weight quickly turned into a generic vertical spinner.

Here is where I am right now. N20 geared motors for drive, with a 2S 350mah battery. Weapon will be a 1806 outrunner, still looking for exact dimensions for that thing.

Post Mon Jan 29, 2018 10:12 pm 
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Knightrous
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Joined: 15 Jun 2004
Posts: 8492
Location: NSW


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Save some weight and size, drop down to a 180mah Lipol.
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Post Tue Jan 30, 2018 10:54 am 
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MoonSet416



Joined: 25 Sep 2016
Posts: 431
Location: Sydney


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I would love to do that, but 5A for 3 minutes gives me around 250mah and that's just the weapon...

Post Tue Jan 30, 2018 12:21 pm 
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MoonSet416



Joined: 25 Sep 2016
Posts: 431
Location: Sydney


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Radio related question:

I have a HK T6A Tx with me, and I also have the stock Rx. However the receiver might be a bit too big for an ant, so I would like to search for a smaller receiver. Is there a certain protocol to look for? (Google says DSSS v2, but are DSSS radios ok?)

Post Tue Jan 30, 2018 4:50 pm 
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Knightrous
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Joined: 15 Jun 2004
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Location: NSW


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quote:
Originally posted by MoonSet416:
I would love to do that, but 5A for 3 minutes gives me around 250mah and that's just the weapon...


I ran a 2204 for my 35g disc on 3S in my ant and had no issues lasting 3min matches with 180mah packs. The fights were usually quiet abusive too.
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Post Tue Jan 30, 2018 5:55 pm 
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MoonSet416



Joined: 25 Sep 2016
Posts: 431
Location: Sydney


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Awesome fights!

Ah I see the difference here: I'm using 2S and you're using 3. A 3S 180mah battery has about the same energy as a 2S 270mah. I guess I will be drawing a bit more current, but at a lower voltage.

EDIT: I would love to use 3S but the cheap ESCs from Taobao prevented me from doing that. I guess I would need a "hotter" motor to achieve the same power at 2S.

Post Tue Jan 30, 2018 10:55 pm 
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MoonSet416



Joined: 25 Sep 2016
Posts: 431
Location: Sydney


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Knightrous you were right, the same motor running at 2S will have a lower current than on 3S, and will require less mah over the same amount of time.

Update:

Switched to a 3S180mah system. This time I decided to do something I've never done before: a horizontal spinner! It's called Claymore.

EDIT: Parts in this version:
N20 30:1 geared motors
Botbitz 10A ESCs
3S 180mah Battery
ZTW 18A ESC
Orange RX R410X Receiver (Switching to ORX stuff cuz HK receivers are just way to big for a 150g)
DYS 1806 2300 kv motor

Post Tue Feb 06, 2018 10:36 pm 
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MoonSet416



Joined: 25 Sep 2016
Posts: 431
Location: Sydney


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A few questions:

What settings do you guys usually use for 3D printing the chassis and what density would the final chassis have?

I don't really have the weight for threaded inserts, so what diameter should I let the screw holes (M2) be in the print?

Looks like I forgot about the fact that Chinese machine shops all close during the spring festival... I wonder if there are any machine shops in Australia that can cut some 2mm Hardox? (preferably at a low price)

Post Thu Feb 08, 2018 1:38 am 
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Nick
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Joined: 16 Jun 2004
Posts: 11799
Location: Sydney, NSW


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I always use 100% infill for ant parts - not that they have had any matches yet. I print small holes around .2mm oversize and on my printer that is a tight fit on the screws, sometimes the holes need drilling out but your printer could be quite different; run a test.
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Post Thu Feb 08, 2018 10:29 am 
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MoonSet416



Joined: 25 Sep 2016
Posts: 431
Location: Sydney


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Ah I see. Thanks.

Post Thu Feb 08, 2018 3:40 pm 
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MoonSet416



Joined: 25 Sep 2016
Posts: 431
Location: Sydney


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Update:

So the machine shop I found on Taobao just told me that they could make my weapon bars in time... I guess I will have to get those made in Australia...

So this is what the blade looks like...



Please correct me if I'm wrong but I feel like most of this can be laser cut from 2mm Hardox. However, the countersinks are a problem. Any ideas on how I can get this made?

Post Fri Feb 09, 2018 8:01 pm 
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Glen
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Joined: 16 Jun 2004
Posts: 9479
Location: Where you least expect


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Thinnest hardox is 3mm (3.3mm actual). Is this for an antweight? It's probably easier to get it made from titanium Smile Can have it CNC'd easily then.
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Post Fri Feb 09, 2018 8:14 pm 
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Dylon



Joined: 09 Nov 2006
Posts: 631
Location: Newcastle, NSW


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sounds like a cheap drill press would solve a lot of these hole related problems you are having Wink
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Post Fri Feb 09, 2018 8:33 pm 
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