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360 - mini hypnodisc

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  • Re: 360 - mini hypnodisc

    We were going to double it up to 26mm thick with 2mm ti on the outside, and then glue in an Alu insert to sit the bearing in but your method will be much more reliable. We might test the cellite bulkheads in a drum beetle but we are now going to go with the tried and tested methods

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    • Re: 360 - mini hypnodisc

      eugh, i typed out a long post about aluminium honeycomb but my net screwed up when i submitted it. Can't be bothered typing it all again. To summarise, it can't be used to directly insert bearings into however is very usable. If you want info on the best ways to use it, give me a shout.

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      • Re: 360 - mini hypnodisc

        Ed's done a great job of cncing my bulkheads so far at work;

        Skimming down the alumec 89 to exactly 20mm;



        bulkheads and back bolted up;



        Just needs a square hole in each for the motor gearbox to sit in, 2 slots in each and a pocket for the drum axle to sit in, then there done... might make up the devider plates in the chassis this week some time.

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        • Re: 360 - mini hypnodisc

          Chassis with bits in;



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          • Re: 360 - mini hypnodisc

            Aww Dave, you should've told me you were gonna rebuild Drumroll in ali for me :wink:

            Just kidding, it's looking great. I'm really liking the increase in drumbot production at the moment, gives me motivation to keep Drumroll running well and improving any areas that need it.
            In-runners seem to be popular with the US drumbots and worked well in Galactus so I'm sure it'll pack a punch. Timing pulley looks weird without the teeth but hey, it works...

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            • Re: 360 - mini hypnodisc

              Does the toothless timing pulley mean the belt can slip in impacts? Why not use a v belt or o belt if you want it to slip?

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              • Re: 360 - mini hypnodisc

                V belts dont like tight radius's such as the small pulley id want to use on the motor, and i dont trust the o belts to remain at a constant tension.

                Timming belts (especially the HDT range) are very strong and flexible...


                Jamie- yeah i know it looks like the love child of galactus /touro / drumroll but its kinda hard to make a drum robot that doesnt look like that while being invertible :P

                Whats the length, diameter, weight and speed of drumrolls drum? Trying to work out if im going to actually be able to turn without flipping it lol.

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                • Re: 360 - mini hypnodisc

                  It's gonna flip. Get some magnets in there

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                  • Re: 360 - mini hypnodisc

                    Originally posted by mr_turbulence
                    Jamie- yeah i know it looks like the love child of galactus /touro / drumroll but its kinda hard to make a drum robot that doesnt look like that while being invertible

                    Whats the length, diameter, weight and speed of drumrolls drum? Trying to work out if im going to actually be able to turn without flipping it lol.
                    Yeah, trying to come up with something different looking is tricky. Mine is pretty much a Proteus/Reboot love child, figured the best way to make it look different was to lather it in metallic blue paint.

                    Can't remember the exact stats off the top of my head but it's something like 180mm long, 76mm diameter tube (with 12mm deep teeth) and around 2.2kg spinning at - theoretically - 7000rpm, so minus a few hundred for losses.
                    To be honest, I find the gyro-dancing reasonably controllable. If I'm going in a straight line then turn, one side will lift up but it drops back down again by the time you've completed the turn. Actually helps to prevent over-steering to a degree. If I want to use the gyro to flip it, I usually have to crank the transmitter stick completely to the left or right to get it to turn itself over. So it may look wild and out-of-control, but I like to think I've got it obeying my commands

                    If your drum is heavier/faster I imagine the effects will be exacerbated, so you may well feel the need to add magnets. Best bet would be to just try it out once it's all running and see what you think.

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                    • Re: 360 - mini hypnodisc

                      Just think of it as a self righter for free!

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                      • Re: 360 - mini hypnodisc

                        Changed my mind on the gear ratio, decided to slow it down to 13,000rpm on paper due to strain on the motor etc... glad i did, as i tested it today and its a tad current hungry on spin up.... works ok though;

                        http://www.youtube.com/watch?v=F9EEOcTAvKA



                        should be able to get the current draw down, belts slightly tight at the moment, and the timing on the motor wasnt set right.

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                        • Re: 360 - mini hypnodisc

                          Jesus Christ that's insane man, the noise! The RPM! The amps?!

                          Combat robot porn.

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                          • Re: 360 - mini hypnodisc

                            Scary sounding stuff. Will be interesting to see how effective it is at such high speed

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                            • Re: 360 - mini hypnodisc

                              I really appreciated the perfect spin up no wobble / vibration.

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                              • Re: 360 - mini hypnodisc

                                Yeah seems ok gabe, it was clamped in the vice for the test, but it would of shook the table a bit if it was out of balance... I'll try get the top and bottom wedge/feet bits made in the next few days so I can do a spin up and drive test.

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