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Jolt & friends - Team Overkill - NSW
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maddox



Joined: 21 Dec 2006
Posts: 720
Location: Belgium


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Looks perfect to me.

Post Mon Apr 17, 2017 9:15 pm 
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Nick
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Joined: 16 Jun 2004
Posts: 11494
Location: Sydney, NSW


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The crappy test rig or the squishy wheel rim? Laughing

Test update: one tread pattern peaked at 6Kg, 50% more than a Colson so that is the clear winner - exactly which one it is remains a state secret until the next event. The next step is to make some proper hubs to replace the printed ones and find the best glue to hold everything together. It should be possible to do a realistic driving test; if I put a full sheet of 3mm MDF on the floor and place some washers or nuts under it to simulate an uneven floor, I can drive Mr Mangle over it with Colsons and then the new wheels to see if there are any improvements. If that works out, the 3D printer will be running continuously for weeks!
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Post Tue Apr 18, 2017 12:32 pm 
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maddox



Joined: 21 Dec 2006
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Both.

Post Tue Apr 18, 2017 3:10 pm 
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Nick
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Joined: 16 Jun 2004
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Location: Sydney, NSW


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Wheels:

I made this simple jig for glueing the flexible rim to the hub:





That lets me apply glue to both surfaces and slide them together with less mess and oozing. Pulling the bamboo skewers out afterwards needs a vicegrip though. A larger version of the jig will do the same job glueing the rim and the outer tread.

The 3D printer is busy making a batch of narrower rims to fit the original Mr Mangle for a more realistic driving test - I'm not going to fall for the "too dangerous to test outside the arena" failure Smile

Mr T:

The wiring is almost ready to test; one motor sensor lead is a fraction too short and I have to steal a lead from Shiny.

Sawnado:

There are plans for a new version of Sawnado but for Vivid its just getting brushless drive. There are two motors to try out; the NTM 35-42 and the smaller Scorpion 25-20. The NTM will have to take a huge over-volting from the recommended 3 to 4S up to Sawnado's 6S battery. The Scorpion is already wound for 6S but will have lower speed & torque.
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Post Thu Apr 20, 2017 2:58 pm 
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Nick
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Location: Sydney, NSW


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Mr T:

The drivetrain wiring is finally complete and the wheels are turning Very Happy. After the wiring operation, the CAD for the metalwork has been tweaked to make servicing easier and fix a few problems.; rapid prototyping is all well 'n good, but the revisions are now into the double digits and I need to get the parts water jetted ASAP.



The next step for the electrics is to program and wire the Arduino that controls the Burket valve. Its simple in theory but as I have never used the Arduino IDE there are bound to be problems.

Sawnado:

The new brushless gearmotors are 3/4 done; the 2nd motor just needs mounting on the P60 gearbox:



The Propdrive (NTM) motors are very well made and I hope they cope with the over-volting.
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Post Fri Apr 21, 2017 7:49 pm 
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miles&Jules
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Joined: 19 May 2010
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They look solid🤖
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Post Tue Apr 25, 2017 12:50 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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Wheel update:

I started making hubs and flexible rims for the Original Mr Mangle today. The wheels are a bit thinner than the ones in Mangle 2 and the spiral spokes had to be almost twice as thick to compensate for the smaller face width:



The hub is made from glass filled polycarbonate, which is extremely impact resistant and is easy to glue. To help the rim stick, I added a coarse spiral around the hub - even without glue, the added friction makes the rim very hard to turn on the hub. The down-side of the polycarbonate hub is extra weight; even with recesses in both sides of the hub and all the holes in the rim, the wheel still weighs 3 grams more than the equivalent Colson wheel.
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Post Tue Apr 25, 2017 9:36 pm 
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Nick
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Mister T:

I finally submitted the CAD for the frame to get water jetted:



33 parts and 1,000 x 500mm - what was I thinking? Its my very own Juicero over design project Laughing
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Post Wed Apr 26, 2017 2:05 pm 
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Nick
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Location: Sydney, NSW


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Suspension Perfection:

I fitted the narrow wheels into Shiny (it was less work than Mr Mangle) and the wheel's squishiness perfectly matches the bot's weight.



When one of the front forks is lifted, I can see one wheel compress and the other one relax so that they both stay on the floor.



There is about 3mm of height compensation before the wheels start to lose contact with the floor, which doesn't sound like much but its a huge improvement on the Colson wheels.
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Post Wed Apr 26, 2017 5:03 pm 
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Valen
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Joined: 07 Jul 2004
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Location: Sydney


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damn, that looks good
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Post Fri Apr 28, 2017 9:32 am 
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