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Re: Speed 900s
Originally posted by mr_turbulence
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Re: Speed 900s
Gadzooks! That was bigger than I was expecting :shock:Comment
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Re: Speed 900s
Rambunctious!Comment
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Re: Speed 900s
I guess Jamie REALLY likes the Brushless remark!Comment
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Re: Speed 900s
Well Dave posted that just after I worked out that the theoretical top speed from my brushless setup is going to be 7600rpm, so it really spoke to me, y'know
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Re: Speed 900s
Does that mean I have invested in something which will be ineffective? Or will it work with the current quality of armour but not be as good as the brushless option? (which seems to cost about 4x more inc esc's!)Comment
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Re: Speed 900s
Speed 900s are a perfectly decent and extremely robust choice of spinner motor. It's just that your output RPM is a little on the low side compared to what most of us are used to. Using your ratio, I worked out that you're planning on running it at 12V, but you will get much more out the motor at 18V and more so at 24V. They can cope well with those voltages.
If running 12V is easier for you, I'd suggest buying bigger pulleys for your motors and having a ratio around the 1.5:1 mark. That gives you an output of approximately 4330rpm but factor in mechanical losses due to friction, plus the motor being under load and that figure will drop a little. Still, the motors would easily reach that speed within a second or two.
Alternatively, build it with your 2.667:1 ratio and try out some test hits on something that weighs close to 13.6kg. It might throw robots more than inflicting localised damage, but you'll be able to see what the weapon can do and then decide from there if you want to increase the ratio for more speed.Comment
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Re: Speed 900s
With the current battery set up they would run at 14.4V but I am looking into a 6 Cell Lipol to give me near 24, but I need to drop the voltage for the drive motors and finding a voltage regulator that does that particular conversion is proving extremely difficult!
And throwing robots is not exactly a bad thing :-), It looks great and I would rather knock someone out by putting them out of the arena or turning them over than having to resort to trashing their robot to beat them any day!Comment
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Re: Speed 900s
As long as your speedos can handle the extra voltage going through them, all you have to do is limit the travel of the transmitter channel to say 50% on each channel for the drive. This then in essance means that the drive motors only ever see 50% of the voltage from the batteries (there's a little more to it than that but that's the basics)Comment
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Re: Speed 900s
^ what Gary said. You will be able to ensure the drive isn't overloaded on the software side (easily if you've got a transmitter like the DX6 with option menus on-screen) rather than needing a physical regulator. Only hitch is the speed controllers will work a little less efficiently but that should be OK if they're large enough to dissipate some extra heat.Comment
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Re: Speed 900s
Originally posted by mr_turbulence
And getting good tooth engagment at that speed is very very easy....
According to me is 2000 rpm perfectly serviceable for a 350mm disk.Comment
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Re: Speed 900s
8000rpm engages fine with single tooth
... 2 teeth engage fine at 5000rpm... just talking from experience.
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Re: Speed 900s
Been a while but now I have all the parts attached is the wiring diagram I think works... can anyone confirm?
[attachment=0:245taqkd]Weapon Relay Wiring Version 1 Diagram 1.pdf[/attachment:245taqkd]
Both systems work by controlling the negative. Part one... the power goes into the 100A relay's low Amp side then into the battle switch for control. When activated the battle witch lets the input from the 100A relay go to negative...
Now the other system kicks in... the 22.2v goes straight into both speed 900's then into the positive of the 100A relays high Amp side. When fired by the battle switch the 100A relay allows the speed 900's output to go to negative...
I hope I have explained that right...
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