Place I rang didn’t stock but he said about $24 per length
$12 per length
Best you are going to get is 25nb Hvy Blk Pipe OD 33.7mm Wall 4mm 6.5m about $50
nuts and bolts are cheap I would allow around $150 for it
so that’s roughly $500 of the budget so far
Ok so if we are going to go with the standbeast idea, we could use the following setup:
we could attach the “legs” directly to the shafts. These motors are already mounted on a frame and are geared down… the unit can carry an adult without a problem…
we then only need a simple DC motor controller … these motors may draw a lot of amps>>> any suggestion on where to buy this?
I have one if we get some new disks for it
I have a drawing done and it’s entirely feasible. Especially with a little help from some willing hands to bust out the bulk pieces, Ill get on to some steel joints monday and we can get stuck right into it.
First prices are
SHS - 15 x 6.5mx15mmx15mm = $195
10mm round bar - 3 x 6.5m = $30.60
10mm NB black med pipe - 2x 6.5m = $45.70
25 NB black med pipe - 1x6.5m = $46
So around $350 for steel
200 x M6x35mm = $20
50 x M10x35mm = $15
20 x M10x70mm = $8
20 x M10x90mm = $9
Another $50 for fasteners.
Going to need a steel cutting blade for the drop saw, they’re around $50 and will last ages if people aren’t shitheads with it. Also, I don’t know when the new MIG welder is going to be here, bear said this week maybe some time so hopefully that happens quick smart as it would accelerate this thing immensely. So maybe another ~$100 for welding consumables
So, I guess the bulk of the stuff can be had for around $500-600, but that will inevitably blow out at least somewhat. But so long as those window motors are strong enough, which I think they should well be, we’ll be fine. That’ll leave us plenty left over for a decent power system.
What are everyone’s thoughts on power? Im thinking for sake of simplicity, a big array of 3s LiPos, 6-10 x 2200’s should have us kicking around no worries.
Holy shit, I’d forgotten about them Victor, those couldnt be more perfect.
I have some 12v 80ah SLAs if they are suitable
The red drop saw burnt out about a month ago. I just had a look on gumtree and found this
Thats an awesome saw, perfect for what we need. No more abrasive wheels if we got something like that. Really good price for that piece of gear too. If the space can’t afford it right now (we should make it work, thats an awesome piece of kit) then we could replace the red one with a similar item like this.
http://www.gumtree.com.au/s-ad/brisbane-region/miscellaneous-goods/steel-drop-saw/1058748378,
which works well enough, just like the red one, but it’s nowhere near as user friendly.
Oh myyyy… yes, a thousand times yes. Would you part with them long term? As i would really like this thing to be around long term.
How many is it likely to need? I could spare a couple, though I can’t guarantee what condition the cells will be in, should still be of reasonable use. Long term sounds awesome to me.
And it seems my charger has packed it in so I won’t be able to charge them up, but I can bring a couple in on Tuesday
Awesomeness. I figure 2 would be more than we would ever need. Victor says they draw 10A which seems pretty legit, and I can’t imagine ever needing to run it for anywhere near 8 hours.
Deal. Extra capacity means extra bling! I’ll bring them down Tuesday afternoon/evening. Keen to help out with the rest of the project too
As for the motor controllers … this is what Skip was using http://www.ebay.com.au/itm/60A-Dual-Motor-Driver-Drive-Module-H-Bridge-PWM-Control-for-robot-projects-NEW-/230965079712?pt=LH_DefaultDomain_0&hash=item35c6976ea0
Dual BTS7970 chip structure (max current 68A)
5V isolation from MCU. This way MCU is effectively protected.
Isolation based on 5V power supply (can share 5V power supply with MCU)
Module Input DC 5~25V
with PWM1, PWM2, PWM3, PWM4 (support max 15V)
Input max 25kHz frequency
Board Size: 5 X 5 cm
$36
Looks legit. Can you grab one of them?
Local alternative? http://www.jaycar.com.au/productView.asp?ID=AA0349
Control DC loads such as motors, lamps etc. Pulse Width Modulation(PWM) also allows electric motors to start smoothly at low RPM. Control range is approximately 5 % to 95 % of maximum output, set with a 4.7k potentiometer.
Specifications:
• Operating voltage: 9 - 28 V/DC
• Max. current carrying capacity: 10A with heatsink, 5A without heatsink
• Control range: < 5% to > 95%
• Control mode. pulse width modulation
• Dimensions: 86(L) x 60(W) x 33(H)mm
$49.95.
Just concerned re: shipping from Hong Kong and getting it before Nov 1
Another thought, nylock nuts?
I would like to see the space own such a lovely unit and will be a great asset during this project.
As such I would like to put $50 towards the heavy duty drop saw…
I’m willing to foot the bill until the next meeting or until more members decide to contribute.
Thats awesome hovo, its a really nice bit of gear, I’ll throw some in for it too.
ill ring him up now and see what he says
It’s still available, I’m going to look at it now. If it’s in good nick, ill put a deposit on it and we can pick it up tomorrow.
Its awesome, I told him I’d come grab it tomorrow. Got it for $250.
