Can your gearboxes be made using longer shafts?
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Can your gearboxes be made using longer shafts?
Hi, assuming you're referring to the Saturn-16, the length of the output shaft (along with other dimensions) is fixed. It would be possible to produce a longer version, but without access to the right tools, at a very high cost - it's a complicated one-piece gear carrier and shaft.Quote:
Originally Posted by higgeh
Its quite a long shaft as standard. Why do you need a longer shaft?
just the way im looking at driving my wheels needs a long shaft so i can have a wheel direct attached, a gear for a chain and some form of support.
back to the drawing board
That shaft is more than enough. I've fitted 10mm wide timing pulleys on there, and 6mm chain (at different times) a 30mm wheel and still had tonnes of shaft left
Quote:
Originally Posted by harry hills
Agree with Harry. Have a dig through the build threads and you should see how people have managed with shorter shafts than the standard Saturn
cheers for the help. Should be able to get over my problem by using a couple of collars to compensate.
Thanks again.
If you have to elongate that immensely long shaft of the Saturn, make sure there is support on the outside.
In the past, people fitted 30mm wide wheels and 20mm wide timing pullies on standard batterydrill drives. And that shaft is barely 20mm long.
yeah looking at 45mm wheels with 22mm gears so that takes me up to 87mm then I will be supporting it with a bearing at the far side that's about 10-15mm wide so that's me up to 102mm call it 105mm to be safe.
Should be fine with a collar will also make changing wheels a bit easier :-) Will do some more design work then try and get an order in once stock of the 85A controllers goes up again.
Hi Ellis will you be getting the 10A ESC's in stock anytime soon?
Any idea on the depth of the mounting holes of your gearboxes. Im looking for the dimension of the ones that are in the 37mmx24mm pattern on top so I can measure up for mountings
Hi, the Saturn gearbox mounting threads are about 8mm deep (threaded portion - hole itself might be a little deeper).Quote:
Originally Posted by higgeh
Yes! It's been an absolutely hectic week or so, but I'll be placing a new stock order for all ESCs soon. ETA would be around 2 weeks from now. Apologies for the wait. :)Quote:
Originally Posted by MrkLeigh
I think you can be excused, you did die on television and be resurrected after all :)
I can wait :) just glad you'll be getting more in. They seem all the rage in beetle weights!
Any updates on those ESC's Ellis? :)
Hi, they should all be in early-mid next week if DHL do their job. Thanks for your patience (everyone)!
Awesome :) couldn't inbox me a price on 4 with postage could you?
could you roughly estimate how much shipping to germany would be for let's say 4 motors + gearboxes and esc?
By now i didn't decide if i want 2 or 4, but better plan the more expensive version
Last package the size of 4 Saturns with motor+ ESC's was £20 for insured P&P to Belgium.
And whatever you buy, buy a spare. Not because the parts are bad, but because Robot Wars is plain destructive.
the plan (at the moment, still gathering information and planning) is to build a 2wd, so with 4 i would have one spare for each.
or, with shipping not that expansive, but not much money to spend at once maybe just 2 first, get a prototype working, and buy spares before first fight. I'm quiet aware it's destructive and not a cheap hobby, but i can spend money only gradually, not all at once. so i need some calculating on what's the best way to do this^^
Hi Ellis
I sent a email about 3 days ago regarding the threaded bars on the site. I guess you haven't seen it yet, but I just wanted to know whether or not you was planning to replenish the stock on the M6 threaded bars?
Hey James, sorry for the delay. It's my error actually. Someone else emailed with the same question, and I replied to them, and mentally ticked this off the reply list!Quote:
Originally Posted by Coolspeedbot
Sadly though it isn't great news for your current build. I expect to replenish stock of the threaded bars one day, but it won't be very soon. The demand is too small to make it worthwhile, as in order to keep the retail price reasonable, the manufacturing run has to be substantial (100+ lengths). Having to be really cautious with money after the Robot Wars builds (it's the same small pot) or I'd restock immediately.
Sorry to disappoint - if you have access to a pillar drill/drill press, the square bar can be ordered all over the net, perhaps you could make the bits you need this time?
Oh ok. I have a pillar drill stand that holds handheld drills so I should be alright there just not sure what I need to add the thread to it.Quote:
Originally Posted by Ellis
Aldi had a nice threading tap / die kit for £15.99 recently. Does Metric sizes up to M10 or M12.
Went on sale a few weeks ago, but my local Aldi still has a few left.
edit: think they have had it reasonably often, like those tig welders they do - someone was talking about it in 2012: http://www.mig-welding.co.uk/forum/t...die-set.30878/
I see, well there's no rush, Wolf-E doesn't need to be finished any time soon, target is extreme robots in maidstone in november.Quote:
Originally Posted by lowndsy
I put a detailed account of how I made the massive threaded bars for series 1 Pulsar on Facebook: https://www.facebook.com/pg/teamrang...97292773908393
I wouldn't recommend using a drill to tap the holes (unless you're confident about the risks) - it's rather safer, if slower, to do them traditionally by hand - but otherwise this is exactly what you'd need to do, just at 200% scale!
I would suggest getting some quality taps as well. I don't know what the Aldi set is like, but cheap multi-packs are inevitably going to be quite low quality. A fellow builder was recently caught out by this; the really cheap specimens simply don't work. Some namebrand individual ones (you'll want M6x1.0, straight flute, hand taps) from pretty much anywhere should do nicely.
I give that a look, and thanks for the heads up on taps.Quote:
Originally Posted by Ellis
If you get spiral flute machine taps then they work great with a cordless drill. These are the ones I use: http://www.cutwel.co.uk/threading/ma...1-tb804-seriesQuote:
Originally Posted by Ellis
They are a bit pricey but go in nice and straight and the clutch on the drill makes it almost impossible to break a tap.
Strangely, spiral taps are the ones I break the most often - perhaps its just me :). Spiral taps are designed to extract chips out of blind holes; I would suggest using the confusingly named spiral point taps (also called gun taps), they are cheaper and designed for tapping through holes, For aluminium, getting a black oxide coating helps reduce friction and breakage.
http://www.regalcuttingtools.com/sit...nt%20Tap_0.jpg
The angled section at the tip helps to shear metal with less force and makes tapping a bit easier. you should also use some cutting oil, for aluminium I just use engine oil thinned a bit with kerosene.
When you tap using a machine its best to use a slightly larger drill than usual, the threads will still be strong but the amount of force needed is much lower. For the M4 size nutstrip, use a #29 drill and for the M6 size, use a 5mm or #8
Forgot to update this with the news that Ranglebox now stocks the "RageBridge 2" ESC from Charles in the US. I have actual UK stock, so delivery is a few days tops. Should save a lot of hassle - no long shipping, then waiting for customs, then customs charges to worry about!
I had 12 in stock 36hrs ago, now only 9, so this first batch won't last long! http://ranglebox.com/product/ragebridge-2-brushed-esc/
I heard people were using them in heavyweights, would they work for them?
Yeah the Rage will work for heavyweights, so long as you don't exceed its max voltage! I don't think it can take 12s. It's good if you're running the right voltage though, because it's a dual channel ESC (just one ESC for both sides of the drive) and it has active current limiting which means it shouldn't blow up from too much current draw.
Are we talking ampflows here? I'm sure they can run wheelchair motors, they seem the least demanding of heavyweight motors. Brilliant! I though they were only for American lightweights, middleweight at most. I saw Tango with one using 4 motors (looked like ampflows), but surely that would be too much for them?
Yeah they won't do crazy amps, so only really one motor a side probably. But I know PP3D used the ragebridge for one, and it's possible to run two ESCs at the same time if you want four motors. It still works out quite cheaply as heavyweight ESCs go.
I run 1 per motor in my heavy on F series short mags and they work just fine.
That's amazing, even one vyper costs more than those! When I get onto building mine, I'll be sure to get one.
Heavy Luna-tic will be running a Ragebridge with 2x 24v 800watt scooter motors. (on 24volts/6s lipo) Thing to remember is its not a fancy ESC. Its basic, but its does the basic VERY well and cheaply. Don't mess about with it, or over do it with the amps and volts and it'll be happy all day long!! (so I've been told) lol!!
BotBitz ESCs (10a and 30a) in stock, RageBridge v2s in stock, and a few Saturn-16 gearboxes + 775 motors should be available in the next few weeks too. :)
http://ranglebox.com/
Good news, I could do with a couple of Saturns (need to run rings around a few bots ;) )