RoboSavvy Forum

Additional Servo in RN arms

2006-08-28T01:10:06+01:00

Hehe, nice arm thingy, Beermat. You could do some serious damage with that! Consider entering it in Combots!

I'd like to do the rotating arm mod at some point, but I can't/ don't know how to fabricate parts. I was thinking that mabye a U-Bracket could work? It looks a lot like it's just a U-Bracket....

Statistics: Posted by 1UpCheatachu — Mon Aug 28, 2006 1:10 am

Additional Servo in RN arms

2006-08-28T00:43:11+01:00

You might be able to use a Hitec HSR-5995TG servo (333oz.in. of torque - .11sec/60degs. @6.0v), remove the pot and servo stops on the drive gear. That'll give you a fast & powerful continious drive motor. As for attaching, there's a third-party after-market aluminum over-sized servo horn for Hitec servos... may want to look into it.

Statistics: Posted by bauermech — Mon Aug 28, 2006 12:43 am

Additional Servo in RN arms

2006-08-28T00:33:27+01:00

bauermech wrote:
That gives new meaning to the term 'Rollerblade' huh

lol, 'rollerblade'. lol.

The blade is attached to a DC motor, although not too well. I just noticed the blade in Home Depot today, and the thought crossed my mind! It spins nicely, with a bit of vibration, but I need a more secure way of attaching the blade to the motor shaft. Also, as you can see, the bracket attaches to only one side of the servo, with a longer piece of aluminum wrapped around the motor and screwed back to the bracket. Strong enough to hold in place whilst spinning, but might not prove to be strong enough to be able to use the blade for cutting. Still, that's my first ever home-made aluminum bracket, so I'm chuffed

Statistics: Posted by beermat — Mon Aug 28, 2006 12:33 am

Additional Servo in RN arms

2006-08-28T00:11:17+01:00

bauermech wrote:
Nice hands Tempusmaster! Some one needs to make some shooting Gundam rocket fists

You may run into some sooner than you think. 8O

At the last ROBO-ONE competition in Korea "Gadget-1" defeated Dynamizer by using a spring loaded 'rocket-punch' arm design.

I haven't been able to find any closeup details of the arm, but have been told that it has a motor that winds up a heavy duty spring. The punch is deadly, but it may take some time for them to rewind and reset it. They haven't shown up on the ROBO-ONE 10 entry list yet - but there are still a few more days for players to enter.

Statistics: Posted by tempusmaster — Mon Aug 28, 2006 12:11 am

Additional Servo in RN arms

2006-08-28T00:09:07+01:00

That gives new meaning to the term 'Rollerblade' huh

Statistics: Posted by bauermech — Mon Aug 28, 2006 12:09 am

Additional Servo in RN arms

2006-08-28T00:04:59+01:00

awesome! you should rotate that hand servo 90 degrees so it can actually spin that blade and chop up some... other robots. Of course

That is pretty nice looking attachment you have there.

keep up the nice work.

Statistics: Posted by hivemind — Mon Aug 28, 2006 12:04 am

Additional Servo in RN arms

2006-08-27T23:43:49+01:00

Here's the arm mod I'm currently working on:

Statistics: Posted by beermat — Sun Aug 27, 2006 11:43 pm

Additional Servo in RN arms

2006-08-27T20:36:41+01:00

I really the extra DOF on the arms. There's a lot of possibilities with that... Perhaps I will do that someday. I don't know how to fabricate, but it looks as if a U-Bracket would work, but I could be wrong... Would a U-Bracket work? I can't possibly fabricate a part....

Statistics: Posted by 1UpCheatachu — Sun Aug 27, 2006 8:36 pm

Additional Servo in RN arms

2006-08-27T15:31:15+01:00

why do you bother having all the holes inserted arund the servo horn hole-instead of just four-?

Well, thats probably where the 'I have too much time on my hands' thing comes into play. No really, I was concerned about an arm being ripped off during ROBO-ONE. Same holds true with the leg rotation brackets. If the horns were aluminum it'd be another story.

From what I see in your picture it also seems that we have reversed the brackets from my deisgn (my triangular U-bracket contains the four screw holes you inserted into the stock U-bracket)-but thats just an observation.

Yup, you're right. The 'ol flip-a-roo

have you found any significance to pushing the servo down to one side (in your new bracket). Because I have mine centered and it works really well. Just curious how your experience has been Matt.

Hmmmm. I should really take some pics to help explain this... I'll get some around after I get done putting Pawn back together. I'll do my best now though...

I moved them off-center to: #1 keep 'em aligned, #2 when in their 'home position' there is an ample amount of surface area on both the modified servo casing and bracket to help support the rest of the arm. However, when they turn, they (the horns and shafts) are on their own to support the weight of the arm (not that there's a lot).

I doubt there is a significant difference in overall functionality between the two.

The second generation of Rook's Pawn consumed all 24 servo ports with the rotating arms in place. It's functionality was nice, but made him a little extra top-heavy for me. I ended up scrapping the arm rotation in the end (at least for now). The leg servos really dig the extra support, so it's staying like it is.... like I said, i'll get some pics around.

Nice hands Tempusmaster! Some one needs to make some shooting Gundam rocket fists

Statistics: Posted by bauermech — Sun Aug 27, 2006 3:31 pm

Additional Servo in RN arms

2006-08-27T12:34:26+01:00

bauermech wrote:
My goodness...

Come on, show of hands... who's having fun w/ their robot? Remember fun?

Okay. I'm having fun with my robot(s). You asked for a show of hands - how about this one:

or, if you like simplier, more straight forward designs, then I'll raise this hand:

or, better yet, how about this one?

Statistics: Posted by tempusmaster — Sun Aug 27, 2006 12:34 pm

HI

2006-08-27T06:04:37+01:00

"If we ignore things, they tend to go away"

I totally agree with this. I guess Im not the only one who feel the same thing. but mine was worst @-$$$$$-!!!. I should have done that before "IGNORE THINGS and HOPE IT GOES AWAY"..

Comes worst to worst, you will feel harrased, so better take the advice... I have nothing against him now but obviuosly you know the reasons:

"It's about your general negative and know-it-all insulting attitude in the forum"

"Your 3D designs in your signature look pretty good and if you remember the initial response to your designs was positive (http://robosavvy.com/modules.php?name=F ... opic&t=442), but from then onwards your attitude just put people off"

"The Capt obviously has some major problems."

"Oh God, it's nothing like your pathetic piece of cardboard nonsense, Capn. Now I know why your sites URL is 'brainless.org'"

Statistics: Posted by Chrisbie — Sun Aug 27, 2006 6:04 am

Additional Servo in RN arms

2006-08-27T04:20:33+01:00

Your bracket looks very nice Matt, although it seems like that bracket would be a different design from the one I am using (I wonder why we all have different designs... hmm, weird...). Fate of the universe? Calvinism? Random chance? We both have a little too much free time? Or is it that you are correct and we are both able to make bracket? Wonder I do...

I am curious however Matt, why do you bother having all the holes inserted arund the servo horn hole-instead of just four-? From what I see in your picture it also seems that we have reversed the brackets from my deisgn (my triangular U-bracket contains the four screw holes you inserted into the stock U-bracket)-but thats just an observation. So my final question will be, have you found any significance to pushing the servo down to one side (in your new bracket). Because I have mine centered and it works really well. Just curious how your experience has been Matt.

*raises hand*

Statistics: Posted by hivemind — Sun Aug 27, 2006 4:20 am

Additional Servo in RN arms

2006-08-27T04:07:39+01:00

My goodness...

We must have ripped of eachother because...

Actually I seem to remember Tony Ohm's (of Hitec) 'RN-1E' had a similar design to ours at RoboGames in June... what does it all mean? Probably that we each can make a bracket.

Come on, show of hands... who's having fun w/ their robot? Remember fun?

Statistics: Posted by bauermech — Sun Aug 27, 2006 4:07 am

Additional Servo in RN arms

2006-08-27T04:05:19+01:00

If we ignore things, they tend to go away. I know it's hard to sometimes, especially for me, but let's try to do that, focus on all the good work others are producing.....

Statistics: Posted by beermat — Sun Aug 27, 2006 4:05 am

Additional Servo in RN arms

2006-08-27T03:37:07+01:00

hivemind wrote:
I'm glad most people like my new DOF

It's unfortunate that you seem so uptight about the design Capt. Ithonestly shouldnt be such a big deal. I still guess I do not understand where you are coming from. I have reviewed your video again, and I will post some images of what I saw.

I see here that you do have an additional servo, but as stated in the image, all four arm servos are on the same axis. Lets call that the X axis. The shoulder is the Y axis and I added another for the Z. I am puzzled, your video may just be too dark, but I just do not see an resemblance.

As for stealing your bracket design. I am afraid not. Here is yours:

And here is a sketch of mine:

As you can see I have four holes in mine which corespond to where the servo idler would be. Your design leaves room for the horn itself.

As for your "Swivel Hips" I found those on your website here And it states that the bracket kit you made would sure, only raise it by 5mm but it would put 47mm on each side! Also it pushes them forward by 20mm. That just seems absurd.

Your frakenfoot/Big foot design also seems a little illogical. When i want to put batteries on my robot I want a lot of power (I want to use it for a long time, so more than 700 mah, I want 2200 or so). And most of the LiPo batteries I look at that are the newest generation are at least 14mm in height (the smallest dimension). That is for a 2200 mah battery. Granted one doesnt need two of those, but even one cell in each foot still raises the bot up considerably.

I am open to good ideas. But I prefer you not accuse me of stealing yours when your design is A) not even close, B) not as you explain it (doesnt have rotation in arm) and C) made out of 'stiff' paper.

As for NASAs plywood spaceship, it is still wood, I have also seen robots made out of wood. There is nothing wrong with wood. But it isnt paper. That is fluid dynamics in a wind tunnel, not robots with hands.

To be honest, I love robotics. I love designing, both graphically and mechanically. But please do not verge off the topic of this thread. You are welcome to create your own, but there is no reason to get so upset. Just relax man, its the internet.

fatman, congrats on your KHR-2HV goodluck with hands and grippers, if you need any help getting started let me know!

cheers

Hi,

So, you tried to show off the wrong bracket ... made notes on a few stills of my video whcih clearly shows the servo horn connector bent outward rather than in its intended position.

Here's the correct bracket for the arm ... you posted a different bracket designed for a different job ... but notice I also include a bore for the servo body's 12mm base to allow the servo to fit snugly against the bracket ... not sticking out as your pencil drawing depicts ... and I have correct RoboNova-1 bracket shape and it's positioned properly so to fit the end of the servo whereas your drawing shows four small bores symmetrical to the bracket ... which puts the center of rotation further away from the centerline of the arm ...

Then you say a Thunder Power TP2000-2S1P or TP2100-2S1P isn't enough power even though that's what the LipoFoot and BigFoot feet designs are made for? The TP4000-2S1P isn't enough power for the FrankenFoot?

Then you mock one of the SwivelHip designs ... that's just one idea and NOT the final solution ... if you understood the description you'd be able to clearly see that in the images online ... the final design hasn't been offically published publically yet ...

Hence why you haven't copied that design ... yet!

Statistics: Posted by CaptKill4Fun — Sun Aug 27, 2006 3:37 am