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.
Sun Jan 28, 2018 11:56 pm
MoonSet416
Joined: 25 Sep 2016
Posts: 436
Location: Sydney
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.
Mon Jan 29, 2018 12:13 am
MoonSet416
Joined: 25 Sep 2016
Posts: 436
Location: Sydney
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.
I would love to do that, but 5A for 3 minutes gives me around 250mah and that's just the weapon...
Tue Jan 30, 2018 12:21 pm
MoonSet416
Joined: 25 Sep 2016
Posts: 436
Location: Sydney
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?)
Tue Jan 30, 2018 4:50 pm
Knightrous Site Admin
Joined: 15 Jun 2004
Posts: 8511
Location: NSW
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...
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.
Tue Jan 30, 2018 10:55 pm
MoonSet416
Joined: 25 Sep 2016
Posts: 436
Location: Sydney
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
Tue Feb 06, 2018 10:36 pm
MoonSet416
Joined: 25 Sep 2016
Posts: 436
Location: Sydney
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)
Thu Feb 08, 2018 1:38 am
Nick Experienced Roboteer
Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW
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. _________________ Australian 2015 Featherweight champion
UK 2016 Gladiator champion
Thu Feb 08, 2018 10:29 am
MoonSet416
Joined: 25 Sep 2016
Posts: 436
Location: Sydney
Ah I see. Thanks.
Thu Feb 08, 2018 3:40 pm
MoonSet416
Joined: 25 Sep 2016
Posts: 436
Location: Sydney
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?
Fri Feb 09, 2018 8:01 pm
Glen Experienced Roboteer
Joined: 16 Jun 2004
Posts: 9481
Location: Where you least expect
Thinnest hardox is 3mm (3.3mm actual). Is this for an antweight? It's probably easier to get it made from titanium Can have it CNC'd easily then. _________________ www.demon50s.com - Minimoto parts
http://www.youtube.com/user/HyzerGlen - Videoooozzz
Fri Feb 09, 2018 8:14 pm
Dylon
Joined: 09 Nov 2006
Posts: 631
Location: Newcastle, NSW
sounds like a cheap drill press would solve a lot of these hole related problems you are having _________________ Barton Robotics Youtube Channel:
https://www.youtube.com/user/dyl30
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