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Jolt & friends - Team Overkill - NSW
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Nick
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Joined: 16 Jun 2004
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Location: Sydney, NSW


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Absolutely - titanium reinforced MDF Twisted Evil
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Post Tue Feb 14, 2017 8:27 pm 
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Valen
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The braided rope might also be acting as a capillary system, liquid will flow through it to get to a hot spot where it'll evaporate, like a heat pipe.

I don't think you will want to lengthen your vaporisation tube too much (how much too much is is another question), if it gets too hot then the gas will coke in it and it could block up.

Also I'd run the tube "forward" so as the gas flows it heads towards the hottest part of the flame/assembly not away from it. Wouldn't want to condense anything out by accident.
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Post Wed Feb 15, 2017 7:46 am 
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Cpnwolfe



Joined: 29 May 2012
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Location: Rockhampton/qld


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so jealous that you can laser out a test model in one piece! awesome stuff mate
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Trample the injured and hurdle the dead.

Post Wed Feb 15, 2017 4:28 pm 
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Nick
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Location: Sydney, NSW


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Cutting out prototypes is very addictive, its already helped fix a number of small issues. I wonder how many non-essential organs I'd have to sell to afford a 10Kw metal cutting model? Laughing

The mirror alignment problem is mostly fixed; the Y axis mirror needed a tweak and the entire X axis head module had to be raised up with a 3mm shim. The lens still needs checking but the alignment raised the output power by at least four times - it went from barely cutting through @ 5mm/sec to easily cutting @ 20mm/sec.

The next step is to attach as many internal parts as possible and check that the cables and CO2 hoses all fit. Another use for the model is to check that the bungee arm retraction works. Bungee cords have a poor reputation for breaking and there are some ideas I pinched from compound bows that might help.
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Post Wed Feb 15, 2017 6:16 pm 
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Cpnwolfe



Joined: 29 May 2012
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saweet!
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Trample the injured and hurdle the dead.

Post Thu Feb 16, 2017 6:23 pm 
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Nick
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Location: Sydney, NSW


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Woodsman Laughing

The first MDF sportsman prototype is finished and there were just a few changes. In the cutting file below, the grey parts are the ones I DIDN'T alter:



This is what it looks like so far:





There are a couple of problems with the arm mounts and the CO2 hose has to be re-routed but everything else is looking good. The metal is on it's way and most of the parts that still need to be made only require the lathe, so I can get started right away.
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Post Thu Feb 16, 2017 9:47 pm 
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marto
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I am jealous of your how big your "tube" and "work area" is.
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Post Thu Feb 16, 2017 10:09 pm 
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miles&Jules
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Looking awesome Nick - that laser cutter seems to be coming in very handy😎
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Post Thu Feb 16, 2017 10:13 pm 
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Nick
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It sure is - the model just fits on a 900 x 600 MDF sheet and cuts out in 17 minutes. I can see it paying for itself faster than I hoped.
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Post Thu Feb 16, 2017 10:17 pm 
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Valen
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I've been looking at using spear fishing rubber (surgical tube) for retraction. it elongates up to 10x without damage
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Post Fri Feb 17, 2017 9:47 am 
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Nick
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Joined: 16 Jun 2004
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Location: Sydney, NSW


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Rubber tube or basically any rubber thicker than the strands of a bungee cord are likely to last longer. I think its the tiny cross section of the bungee cord strands that causes them to break down. I have some 10mm bungee already to start with and will probably upgrade to tube.
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Post Fri Feb 17, 2017 10:25 am 
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Nick
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Sportsman:

The next prototype flipper frame is ready. Apart from cosmetic changes and mounting points for the bungee, this is close to the final design:



Painting it was a huge mistake, the 'touch dry in 15 minutes' spray paint is still tacky after two hours Evil or Very Mad! When it eventually dries, I will start assembling the drive frain & electronics. With a UMHW skid pad on the front, the prototype should drive around safely (actual flipping, not so much).

Foam:

The laser cuts EVA foam really well. After several trail runs on old cardboard boxes, this tool foam draw worked out near-perfect:


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Post Sat Feb 18, 2017 1:23 pm 
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Valen
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That is friggin awesome lazoring!

Also I want everything in this drawer
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Post Sat Feb 18, 2017 3:03 pm 
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Cpnwolfe



Joined: 29 May 2012
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Location: Rockhampton/qld


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agreed! honestly i did not know they made digital outisde mics
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Trample the injured and hurdle the dead.

Post Sat Feb 18, 2017 4:25 pm 
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pilleya



Joined: 31 Mar 2016
Posts: 82
Location: Sydney


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For the retraction, check out constant force springs, they will be very durable in your use.

Post Sat Feb 18, 2017 11:44 pm 
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