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Trying to did some good motors for my new rebuild
I know about the speed 900 etc but would prefer something drill motor style
Looking into dewalt motors, but others that are similar but good power?
Got to try and balance cost aswell so would speed 900's and gears etc come out less than dewalts?
yes
Nice and too the point ;)
Speed 900 , currently on the Graupner website ‚53 each. Depending on wheelsize, but lets take a 6-1 gearratio on a 100mm wheel.
Z12 mod 1 is the smallest I would put on the 6mm axle of the 900. £4.69 each.
Z72 mod 1 is a heavy and more expensive gear £22.78 each (and 540 grams)
Don't be fooled, a Speed 900 on 12V will shred plastic gears like chewing gum.
Speed will be around 20 km/h. (pricetag for motors and gears total £143, without P&P or anything)
Also, a strong drive needs a good speedo.
An Mk 1 XXL doesn't cut the cheese when the you go over 16V.
You could use a 2 stage gearbox, using a smaller first stage and then belt drive to get 4 wd.
Adding a timing belt second stage. Adds at least £80 to the setup.
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A Dewalt drivetrain from Robotmarketplace $185,99 each.
In other words, a seriously powerfull drivetrain for a feather will cost a bundle.
Found speed 900's for £36.50 which ain't too bad
It's just trying to find a set of gear (which shouldn't be too hard) then belts for 4wd
Technobots has the gears , timing pulleys and belts. (got the prices from the site)
And if I calculate. ‚53 = £43.74. So yes, £36.5 is better.
(Unless those are rebatched copies, cheaper by the dozen on Ebay)
You are missing the other major point from marios post
You need to be sizing up something serious to control it. Possibly even up to a sidewinder which I believe dave is using in 540Quote:
Also, a strong drive needs a good speedo.
An Mk 1 XXL doesn't cut the cheese when the you go over 16V.
If I could find a sidewinder I would
will need to cost things all up as its basically a new robot, looks like it will get expensive :oops:
Although, mk1 xxL could do 20a, and you say that they cut out with speed 900's at 16v
Thinking about what parts I have around, 30a electronize at 14.4v could do the job? Not sure, just putting it forward
Yes Matt, I do say that a Speed 900 based drive with a low gearratio will draw so much current the XXL's will cut out. That's the job of a current limiter, ain't it?
BonX and Kashei both use a sidewinder for a simular drivetrain. BonX currently uses a 2 stage , Kashei a reinforced MSR 12-72, and both are 6S or equivalent in battery.
The 30A electronises will do the job. But I think you can smoke'm.
Finding a Sidewinder. Doubtfull, people who use them won't seperate from those easely.
And with a pricetag of $499 new at Robotpower, it's a rather expensive , but small and light speedo.
Unfortunatly, it seems the Scorpion XXL v2 can't do mirror mode like the 1 did, making it a 1 channel speedo with 2 times the amp capacity.
What brings another option for a high power drivetrain.
Using more, but cheaper/weaker motors to do the job. The 4 Batterydrill/GR01 machines are around
And it is concievable to do a 6 or even 8 wheel monster with each wheel seperatly driven. But for that, there is a special problem. Making sure all the wheels can reach the ground on an uneven floor.
That may well be something ill have to consider
going for 6WD on 6 motors would give great pushing power, but how many esc's could you get away with?
2 higher power for 4 of the 6 wheels on a potential 6wd and 2 slightly lower for 2, all these being electronize
I'm running speed 900 copies (may get changed out for real 10 pole versions) on 30a electronizes which may get changed out for the TorqueMaster BR-XL escs. Seems to work well on 7.5 to 1 ratio on 120mm wheels
I would be interested to see how the Wotty 100 performs with such high powered motors. Definitely more chance of keeping it alive than Electronizes anyway and Ian can always steer you in the right direction if you need it. It could be the answer to the Sidewinder issue on both price and availability. That and the fact that they can be repaired in the UK without import/export duty.
Robotpower has a certified repair guy in the Netherlands. Ilyama.
Repair of Sidewinders or XXL's ain't an import/export duty issue. But the buying of a new Sidewinder is.
How small is the Wotty 100?
I have a couple of Wotty 100 speed controllers, and I like them I used one in Pilgrim for a while and the other is in Tron. I believe that is one reason this robot pushes so well. The Speedo takes the 4 drill motors by the scruff of the neck and kicks them into battle! I have had the speedo fail at least once but Ian dose such a good service in repair it is never much of an issue.
I think the cost was just under £200 one well worth the investment for me. :mrgreen:
http://www.fightingrobots.co.uk/index.p ... f=3&t=2931
Specs
Not a bad esc at all, if it comes down too it and I need to buy one, that will be it, try and use what I have though
Going to draw up some rough sketches of a 6WD bot as just cost up etc so see if its possible, may just run the one I have till I gather enough cash to build a proper feather. Too many ifs and buts to say right now though
put your vantec in it
That's now up in Scotland ;)
Roboteq?
For what it's worth, if you're going to run 900's on a low ratio (6:1 or so) on 16v or more I highly recommend victor 883's. Even with a dodgy drive pulling 3 times the amp it should, it's been perfectly fine.
Dave, you're right. 2 Victor 883's can perfectly control 6 GR01's .
Been looking at specs etc and was wondering what peoples opinions are on the speed 900 clones in tents of performance for a drive or weapon system?
Those clones/halfbrothers (Johnson makes/made the original Speed 900 for Graupner, but uses the same can for other applications) are usable, but tend to draw a lot more amps, heat up faster and need a bigger gearratio to get the same end speed.
Of course, I can't speak for really el cheapo Chinese copies.
Mario... Borrowed a speed 900 of another roboteer at champs.... It looks similar but output shaft seemed a tad bigger dia, and the rear of the motor had more shaft exposed... Is that a Johnson? Just out of interest.
I have found that the speed 900 clones are not actually that bad- I use 2 to drive Shockwave 2 and one on the bar for Lambda.
Shockwave's are on a 4:1 reduction with the 100mm Competition wheels from Robochallenge and are running on 8S A123's with a Sidewinder controller which seems to all work together very nicely as it seemed to out-push many 4WD pushers at the UK champs
http://www.youtube.com/watch?v=hagSkVpw05g&sns=em
The copies have 5mm diameter shafts whereas the real speed 900's have 6mm
Was thinking of using them for a electric axe
Not sure how powerful an ESC they would need though, would need to be at least 30a?
I knew that Will, this motor seemed to have a 6.5 ish shaft on it...
don't use an esc, just have on/off control
That was for the drive system idea
Can't decide to use a drive or weapon system
don't know if this will be of any help (as I'm not an expert) but i googled speed 900s in the past and found these: http://www.action-electronics.co.uk/pdfs/MOTORS03.pdf
i remember reading that the seller said they are exactly the same performance as the graupner versions but I've lost that link. I think the difference in performance might be down to the fact that the ebay 900s have 12 poles and graupner/ action electronics versions have 10pole? although that action version has the 5mm diameter output shaft.
That's a shame, but I may try and order 4 clone motors as Doorstop showed it could be put in weight
all i can say is that it is possible but consider the weight very carefully in the design stage. It generally depends on what you want from a bot. a two speed 900 driven bot will easily push 13.6kgs about and thats the general direction I'm going with doorstop now. the weight saved can go on armour and/or weapon.
Personally, I would say go for Gimsons if you're using a weapon and the speed 900 route if you're build a wedge/rammer.
Quote:
Originally Posted by mr_turbulence
I got a several of 5 pole johnsons (got them from a US source). Those have a 1/4 shaft (6.35mm, got the drill and reamer for that).
And yes, it's perfectly possible that Johnson made a series with a longer shaft.
Could you get away with running a speed 900 off 1 Electronize ESC, the FR30HX model, or would you have to move to Victor 883's.
it should be able to handle it if you do the external relay modification to it
The Speed 900s want something like 40a continuous to run at full power.
You could probably run them with lesser ESCs. but they'd get rather warm and why fork out for a Speed900 if you're then just going to starve it of potential current. Might aswell get a cheaper motor.
Besides the amount of problems people have had with Speed900s breaking this year has been crazy! If I was forking out £100 for a pair of motors I'd expect more.
Who could do this mod? Mega interested in this!Quote:
Originally Posted by typhoon_driver
You can. You just have to desolder the current relay in place and then switch it out with two 40A automotive relays. Getting the wiring right can be the trickiest part but it's not that much of a ball ache
The relay that pokes out the top yes?
This sounds nice and Bitza! I'm assuming you'll need 2 relays per ESC, but could you use 1 5pole Switching relay instead?
Lol it looks like the old ways have been forgotten! Yeah you need two relays to do the swap out. Basically unsolder the 8 pins from the current relay, solder in wires to each of the 8 connections and then wire them up appropriately onto the relay with the coil side and the power side. There used to be a guide kicking about somewhere that i'll find if i have the time.