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Team M3N7@L B0T - QLD
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Tim



Joined: 30 Oct 2013
Posts: 247
Location: QLD


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Momentum (the bot formally know as Inertia)

Current weight 15.4kg, So in the tradition of the KISS method I've managed to shave 400grams off the bot the top of each tower had 200grams removed, with a potential 1.2 kg to go. However the quoted weight is with all electronics/drives/as it sits in the pics.

note:- cardboard represents where armor will be everything out side of that will be removed (that's where the 1.2kg is) biz armor on the front will stay just replace the cardboard.





To fit it all in I've had to sub the 5S 5ah Nanotech for a 4S 2.65Ah Nanotech I don't really think 4S @ 5Ah is going to be enough as the data logger recorded 12000RPM no load on 5S half throttle with load was 2600RPM with weapon, while a no load spin test on 4S only returned 6000RPM and it seemed from the tests that @ 1/2 throttle on 5S it was just warming up.

I know 4S is safe for 18v 550's drill drives with a support bearing (so will stick to drills) not sure how they would cope with 5S.... however not having data logs re: full throttle weapon test on 4S not to sure that would do the job of efficient KE transfer.

@Valen yep hub is very heavy, 5kg with axle so it needs a diet realistically I only really see 300-500grams max coming off it

still in my hypothetical scenario of 1.2kg frame reduction puts me at 14.2, them maybe down to 13.8 with some magic lathe work on the hub, and I plan to take 250grams out of the base below the blade similar to demon

Ideas, thoughts appreciated.

Cheers Tim

Post Wed Oct 15, 2014 6:55 am 
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miles&Jules
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just make all the armour out of cardboard …it will be so much lighter Very Happy
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Post Wed Oct 15, 2014 9:29 am 
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Valen
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rotate the wep motor 180 deg perhaps, it'll let you bring the angled sides in closer, you can then probably pack the electrics up against the front wall of the bot. and shrink it some more. It looks like you can do the same with that battery pack too.

The part of the hub with the belt on it looks to be 2x wider than it needs to be?
Take a look at the hub for demon or decimator for some ideas.
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Post Wed Oct 15, 2014 9:41 am 
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Eventorizon-GB



Joined: 15 Nov 2013
Posts: 111
Location: Ripon, United Kingdom


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Damn, you Aussies cut it so close with your spinners, specially your verticals. I would never have my batteries that close to my weapon!
You could try stacking things vertically to get the higher voltage batteries in, like on top of the drive motors and tucking your drive ESC's between the front bulkhead and the motors.

Post Wed Oct 15, 2014 7:02 pm 
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Tim



Joined: 30 Oct 2013
Posts: 247
Location: QLD


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This is more the image I was trying to convey






@miles nice to know George Carlin is in the house smart ass Very Happy

@Valen tried rotating the weapon motor & mount it fouls the disc or has to be mounted further back again = more space. In regard to the hub after housing the bearings, bolts and nuts / disc there is only 5mm of alloy under the nut on the right side as you see the pic similar on the other side.

Looking at Demon and Deceminator I get your point, here's the 123D images of the design, the hub does need more work yet, can take material off it but not make it thinner unfortunatly...with out a total redesign.

[URL=http://s1348.photobucket.com/user/eclipse150/media/IMG_16751_zps16aa03f0.jpg.html] [/URL]

[URL=http://s1348.photobucket.com/user/eclipse150/media/IMG_1676_zpsafc0333c.jpg.html] [/URL]

[URL=http://s1348.photobucket.com/user/eclipse150/media/IMG_1677_zps4edd6db7.jpg.html] [/URL]


@Eventorizon-GB the motor mounts are 65mm high and take up alot of space however the support bearing saves drives so it's necessary, I'll be making little padded boxes out of 1mm ally sheet folded and riveted onto the base it worked in mental bot and is really sturdy and light.

Edit:- the front of the bot will end up being 500mm wide as in the pic and 180mm deep with the angled sides

Post Thu Oct 16, 2014 12:39 am 
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Tim



Joined: 30 Oct 2013
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Location: QLD


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quote:
just make all the armour out of cardboard …it will be so much lighter



......you mean like this.....it's 3 kg Very Happy Ready for the 2015 Nats


Post Thu Oct 16, 2014 4:43 am 
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miles&Jules
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Now your talking Very Happy
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Post Thu Oct 16, 2014 10:02 pm 
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Nick
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With that hub, do the bearings fit in the recesses surrounded by the four screws? It seems parts of the hubs could be reduced if that's the case. The other big saving would be to reduce the gap between the wheels and the drills; I don't know how you are doing the hubs but they are taking up a huge amount of space. If you can reduce the gap. the frame could be quite a bit smaller to save weight.
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Post Thu Oct 16, 2014 10:25 pm 
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Tim



Joined: 30 Oct 2013
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Location: QLD


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quote:
With that hub, do the bearings fit in the recesses surrounded by the four screws?


No the bearing sits above the bolt heads hence the size.

As for the wheel mounts they are a prototype hub.

Cheers Nick food for thought anyway

Very Happy

Post Sat Oct 18, 2014 5:26 am 
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Tim



Joined: 30 Oct 2013
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Location: QLD


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UP mini arrived today Very Happy here's a test print and a vid of the print

My new toy... and it's mate the rice cooker


Test print - Bearing


Side shot what does it mean when this happens ie. drop on one side bearing works perfectly! at the start of the print the door was closed keen to see it working I opened the door I figure the temp change had an effect but 5 minutes later the raft had lifted at the front thoughts?


Edit :- Here's the vid this may have caused the warping, temp drop after warm up http://s1348.photobucket.com/user/eclipse150/media/20150428_141700_zpsycv1nxyp.mp4.html


58 second print vid


Last edited by Tim on Tue Apr 28, 2015 9:27 pm; edited 1 time in total

Post Tue Apr 28, 2015 8:21 pm 
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miles&Jules
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Score! Very Happy
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www.mulesfilm.com.au
www.wombokforest.com.au

-Pickasso- Vivid Sportsman champion 2015

Post Tue Apr 28, 2015 8:35 pm 
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marto
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That is probably caused by your bed not being level you will need to do the calibration.

Steve
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Post Tue Apr 28, 2015 8:57 pm 
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miles&Jules
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Joined: 19 May 2010
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Location: ipswich QLD


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That abs collapse would be something to do with temp of room/bed heat. Angus will know…

...time for some serious abs fumes. Twisted Evil
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www.wombokforest.com.au

-Pickasso- Vivid Sportsman champion 2015

Post Tue Apr 28, 2015 9:00 pm 
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marto
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Its peeling off the base and warping. Which could be due to cold but far more likely that the bed is not level from the factory.

Steve
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Post Tue Apr 28, 2015 9:06 pm 
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Tim



Joined: 30 Oct 2013
Posts: 247
Location: QLD


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Cheers guys sounds like I need to make some adjustments and get a hot air gun as per Angus's MakersMuse vids, is there a decent calibration video/and or instructions out there? (will head over to the UP mini thread) pretty happy with a working bearing for a first print Very Happy

Post Tue Apr 28, 2015 9:19 pm 
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