Axe Related Questions.

[archie2000]

So my featherweight looks boring.
Just a block of wood that could get stuck on everything (the design is terrible)
I admire Thor for being not a flipper and a really sucsessful axe robot.
I was wanting to rebuild my fw with an axe (sledgehammer) and I have a few questions before I start.
1) Do they need speed control or can they pass a saftey check using servos and switches?
2) Can you program speed controllers to limit the motors movement, make the axe return slower, rapid fire etc? Could a feather weight beginner do this.
3) Would a few speed 900 replicas be suitable axe motors?
4) I know LS4 uses speed 600's in a drill gearbox, could I put any size 600 motor into a drill gearbox?

Thanks in advance for all your helpful replies.
Archie

[archie2000]

Re: Axe Related Questions.

any help is appreciated here
I like the figures of the banebots motors and would be interested to use banebots 545s with a drill gear box.
how would an rs775 do hooked onto a tz85?
http://banebots.com/pc/MOTOR-BRUSH/M7-RS775-12

[evristow]

Re: Axe Related Questions.

Archie,

Banebots motors are standard chinese Leshi / Mabushi motors and aren't as good as the numbers might let people believe. I've been using their gear motors since 2007 and while the gearboxes are really good - specially the P60, the motors are really bad, to put in nice forum appropriated words.

Now to the questions:

1) I won't answer this one, since rules varies between RFL and FRA and I have only competed once on a FRA event.

2) Normally it is not possible to program movement limit on a standard ESC. If I remember correctly the Scorpion XL/XXL had this feature planned, although I think it was never implemented. You can make the axe return slower, just need to limit (trim) the radio signal. I don't see any reason why a beginner could not do an electric hammer featherweight.

3) That depends on the gearing between the motor and the axe arm.

4) Also depends, but on the drill gearbox. One that accepts RS-550 motors will probably and reliably accept RS-600 motors.

Cheers,
Eduardo

[archie2000]

Re: Axe Related Questions.

Thank you for this response.
I will get in touch with banebots to ask about the figures.
Thanks

[archie2000]

Re: Axe Related Questions.

does anyone mind if I just add all my questions before I forget them?
can I charge lipos inside my robot even if I have a lipo bag inside my robot?
is using BotBitz 10a on a 15a stall motor too risky even if the BotBitz can take a stall of a lot more than 10
will post more as I remember

[Max]

Re: Axe Related Questions.

You can never charge lipos inside your robot- even if you have a lipo bag inside.
I would definatly no use a botbitz 10A for 15A motors (I presume for a feather weight)- using the 25A ones would probably be alright but is a bit risky, the 85A would definatly be fine. I am am pretty sure those ratings are a bit optimistic and that they are the stall ratings rather than continuous ratings.

[Bodge Job]

Re: Axe Related Questions.

the bot-biz ratings are the current ratings for continuous current for a minute, there really only 40 amps for the full 3 minutes

[typhoon_driver]

Re: Axe Related Questions.

I would advise going for the 85a controllers. You can program them yourself from the original turnigy 85a controllers if you are decent with a soldering iron and have a bit of patience. Did it myself to save a bit of cash rather than importing them.

[james...venom]

Re: Axe Related Questions.

One of the main reasons you are not allowed to charge lipos inside the robot is because you should be checking they are ok before every charge.

[archie2000]

Re: Axe Related Questions.

OK so i am still at the planning stage of everything but.
1) How about a few of these batteries http://www.hobbyking.com/hobbyking/stor ... _Pack.html
About 3 of those
2) And banebots rs-775 with 16:1 gearboxes like 720 (are the banebots the cheapest gearboxes)
3) 30A Shore bot bitz
4)2 I max B6 chargers.
5) 2 botbitz TZ85A escs (already got)
6) 2.5mm steel armour (is that enough?)
Is jigsawing steel effective (It is dooable but it just wears out the blades loads)
Hows that for a nice setup?
suggestions/improvements welcome as always

Thanks
Archie

[Max]

Re: Axe Related Questions.

That all sounds good. I don't think you would need 3 of those batteries- one should last a fight.
I presume you mean 30 shore banebots wheels not 30 shore botbitz
I would try and go for thicker steel armour or hdpe or aluminium armour instead- I don't think 2.5mm steel would hold up against spinners. You could go for 15mm hdpe for the same weight.
But it sounds like a pretty good robot!
What will you use for an axe motor?

[archie2000]

Re: Axe Related Questions.

stupid phone not submiting my last post.
It was something like.

Yes, sorry I did mean banebots (I am very easily mixed up)
As for the armour, I am unsure of what it will be as 15mm HDPE adds 3cm to the sides of the robot which is probably best avoided.
I am hoping for steel just because it looks cool....... and its strong.
Might try jigsawing it with a 32TPI blade and some sort of lubricant at a slow speed but I was hoping to leave armour to the last stage of the planing dependant on the weight cost and size.

And since last night I have changed my mind on the drive motors!
These ones
http://banebots.com/pc/MOTOR-BRUSH/M5-RS540-12
Though they stall at just over 10amps more, a botbitz tz85a should have no problem with these.
I can also use my drill gearboxes and wheels on them.
I can also get some R/C motor heatsink
http://www.ebay.co.uk/itm/Ansmann-Racin ... 3cc12b17cf

Lastly I was concidering using some rs-775's as my axe motor 865 RPM 40-50 nm on the tip of the sledgehammer. Although im not sure steel and sledgehammers are usually underweight.

I would mainly like to see some opinions on the change of motors.
Good Bad Stupid?
Thanks
Sorry for this really long post
Archie

[typhoon_driver]

Re: Axe Related Questions.

Why bother paying to import the banebots motors when the gimsons are essentially the same thing?

With regards to the wheels, go for the 40 or 50 shore wheels. The 30 ones are too soft for our uses. I'm speaking from experience.

When working with steel, get yourself an angle grinder. Read up on safety when using one and spend the extra cash getting proper eye and ear protection.

[archie2000]

Re: Axe Related Questions.

the gimsons look great quality and power.
how many other bots run 5s GR-02s?

[harry hills]

Re: Axe Related Questions.

I'm running 18v motors from GR on a 5 cell.