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QLD Arenas
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Valen
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Joined: 07 Jul 2004
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only difference with PWM is there is no inductance in the output so it'll be full current then no current. Shouldn't cause issues I guess as full current will be within spec for the power supply, but with Chinese stuff I'd be worried about things like exceeding the ripple current of its caps.

I'd avoid it close to the event TBH, just go on/off control if you are feeling fancy, otherwise a power switch works ;->
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Post Tue Sep 08, 2015 11:46 am 
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Nick
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The first light is complete, with the extra heatsink channels on the back:



After about 20 minutes, the heatsink is at 38 Deg, which is 20 Deg. over ambient - a WAY better result!

The next three lights will have the heatsinks positioned closer together and right behind the LED strips for better cooling. Unfortunately, Edcon only had enough aluminium to make two lights so its going to take most of the week to get all four lights finished Sad.
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Post Mon Sep 14, 2015 12:54 am 
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miles&Jules
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looks pro nick..cant wait to see em in the arena Very Happy
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Post Mon Sep 14, 2015 2:29 pm 
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marto
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Can anyone in QLD pickup and paint new floor for arena. I am not going to have time before nats and the main sheets are pretty wrecked.

Steve
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Post Wed Sep 16, 2015 5:39 pm 
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miles&Jules
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yep we can do that
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Post Wed Sep 16, 2015 10:36 pm 
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miles&Jules
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whats he plan for the extractor…do we just chuck it in the arena on the floor if there is a liopo smoke incident?
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Post Wed Sep 16, 2015 10:37 pm 
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marto
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Um TBH I haven't even worked out how it works. I would just leave it nearby and put it in if we have a fire to try and consume the smoke.

For the floor we need 8 x 16mm MDF panels painted for the inside. I think we can keep the 20mm ones for the underlay. They will do as is. We have enough cash in the club funds for this.

Steve
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Post Thu Sep 17, 2015 9:07 am 
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miles&Jules
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Righto will grab em in the next week or so…will ask Andrew K for cash.
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www.wombokforest.com.au

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Post Fri Sep 18, 2015 12:02 am 
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marto
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I am also thinking this year might is probably the last we can use if for full combat. With the ever increasing power of spinners I just don't think its strong enough.

Not sure of the upgrade path but something to keep in mind for next years nationals.

Steve
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Post Sat Sep 19, 2015 3:36 pm 
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Nick
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A new door would be really nice but we can probably just replace the steel base panels with thicker steel, possibly upgrade it with Bisalloy. Making the panels a bit higher wouldn't hurt either.

We already talked about stopping the arena walls bowing out, how about just drilling holes in the baseplates and screwing them down to the underlay MDF sheets? A bunch of short 12 gauge screws will stop everything moving and its cheap & easy.
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Post Sat Sep 19, 2015 4:30 pm 
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marto
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A bunch 20mm screws should do it. 8 holes in each one of those beams. 6mm steel, 96 holes well there goes my next sunday. Last time we tried this though we just sheared off the screws.

I think adding some ablative MDF to the inside of the 3mm would be the easiest fix. Even a 10mm sheet would be a massive improvement. My biggest concern is the 6mm poly it needs at least another 3mm on the outside.

Also next time we setup the arena I don't think we should put in the floor until the walls are up and tightened. Seems to cause more issues. But we will need to make sure that we set it up as square as we can.

Steve
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Post Sat Sep 19, 2015 5:25 pm 
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miles&Jules
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i thought the poly might need to be thicker. Uk have half inch poly right? No spinner has actually pierced the steel plate yet…and we do have the mdf cover edge if a spinner did.
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Post Sun Sep 20, 2015 9:06 am 
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marto
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It also has the extra 6mm of steel.

But I think an extra layer of polycarb or thicker poly is next big step.

Steve
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Post Sun Sep 20, 2015 9:57 am 
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RogueTwoRobots



Joined: 12 Jan 2008
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Location: Irvine, Scotland


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The UK Robo Challenge arena used at the champs is 10mm poly walls and 5mm poly roof, with the moat/flip out zone to offer a little protection to the polycarb.

The arena took an absolute pounding this year though. The polycarb thicknesses have been the same since 2007, but I don't know with the constantly increasing power of spinners whether that's something that'll need to be reviewed soon.
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Post Tue Sep 22, 2015 3:34 am 
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marto
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I think 2 separated layers would be better than one thicker internal layer. My concern is not really projectiles breaching the polycarb its a robot flying into it and a direct hit cutting though the layer.

I which case an air gap is going to be much better than solid poly I don't think glen would have much of a problem cutting through any thickness of polycarb. But with an air gap it would be very difficult to get sufficient penetration (while wheels are off the ground) to do so.

Very hard to test these theories.
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Post Tue Sep 22, 2015 12:04 pm 
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