LilGiantsConstrCo

[Lil Giants]

I have the pump on Aux2 (3pos) & set the sub trim way low so the middle position is like 20%. With the mix switch on, pump rpm will ramp up when the valve chs are activated. Due to the large size of the bl motor & pressure set to 25bar, have to have some rotation of the hyd pump all the time so the esc doesn't freeze (a squeal can be heard in some of the early vids of the JD850 b/c the pump speed got too low during delicate movement of the valves - emptying the bucket out across a full full trk to fill every corner without spilling). I could vary the pump rpm on the knob, but I like quick on/off of the switch.

I have two valve settings for the bucket & stick; one setting opens the valves fully without much stick movement for fast digging, the other setting it takes alot stick movement to open the valve for much finer control - like for changing buckets.

I have 3 different settings for the swing as well.

[apfubar]

Originally Posted by Lil Giants

I have the pump on Aux2 (3pos) & set the sub trim way low so the middle position is like 20%. With the mix switch on, pump rpm will ramp up when the valve chs are activated. Due to the large size of the bl motor & pressure set to 25bar, have to have some rotation of the hyd pump all the time so the esc doesn't freeze (a squeal can be heard in some of the early vids of the JD850 b/c the pump speed got too low during delicate movement of the valves - emptying the bucket out across a full full trk to fill every corner without spilling). I could vary the pump rpm on the knob, but I like quick on/off of the switch.

I have two valve settings for the bucket & stick; one setting opens the valves fully without much stick movement for fast digging, the other setting it takes alot stick movement to open the valve for much finer control - like for changing buckets.

I have 3 different settings for the swing as well.

Hi,

Just wanted to say thank you for posting this idea... After playing with my DX10T over the weekend I now have a similar setup for the 944... It should make it much easier to get that fine control...

[doodlebug]

All those various setting's, just like the 1:1 machine's
Cheer's, Neil.

[mog]

wow joe i don't know how you can figger out all that stuff in the radio. i will have to get you the expert in if i ever get a raido like that. all i see is shiny button's that look fun to press.

[dirtpusher9]

Joe, I thank you for letting run your Cat-Volvo truck at the show, it was a blast to play with and I couldn't believe how well it got around, going over all the other loads of dirt. Nice model.

[livefree4780]

ya know... watching your vids and seeing your mods got me interested in this about 2 years ago. actually the first vid i saw was yours. but my point is i keep coming back to your threads. keep up the good work. its inspiring.!!

[Lil Giants]

Yes Neil, all those settings... atm I only have one more ch than the DX8, but I'm having trouble trying to program the DX18 with the same fine control that I had with the DX8.. trying to diagnose what the problems are with my dealer, this DX18 is doing things it shouldn't be and not doing things it should be.

You're nearly half my age Martin, this electronic stuff should be a snap for you!

You're welcome Joe, it was great seeing you again. I'm looking forward to seeing what your next project will be.

Thank you kindly livefree.. where would we be today without the internet with the freedom to learn & share with one another around the globe?

Cheers Andy! The added programming does make for much more enjoyable play.

Ol' whitey back on the bench, turning sharp right made the front wheels stick & not center again, it made it difficult to drive.







Added some more Shoo Goo to the diff, previous gunk shredded away to nothing. The axle is locked up now, but over time the resistant will lessen.









Ed (HeavyDuty) gave me these jackstands when I visited him in St Louis last month, they sure are a handy tool for bench testing the model. Thanx again Ed!

[dabears]

Glad you got that front axle back up and fixed!!

[sandfarmer]

Hey Joe, what has happened to this thread? Is it just me or are all the videos gone? I've tried to use this thread 3 times over the last few days to introduce people to things they didn't even know existed but no vids.... hope all is well up North!

[Lil Giants]

Still working at it nearly everyday, just nothing new to show.. might take some video this wk of the start of the dig on the basement floor.

I have noticed in the last week or so that with youtube's constant updating that IE rarely seems to work anymore, even with updating Adobe Flash player. However, the vids work everytime with Google Chrome browser.

[elliot330]

Just watched the latest video, what do I spy on the left at 3.10? I'm sure I've seen a tracked loader like that ;-) Is it new to the fleet?

[Lil Giants]

Hello Elliot, got it used from some one in the states last spring. It came with a Servonaut system - lights & sounds.. that lasted about one day and then I opted for Sabertooth control and an esc on the pump, much quieter, smoother control. I need to make a different bucket.. next winters project in my new shop.

Here's the start of the floor excavation, dig down about 18 inches, I think that's the 850's max reach. That should keep me busy for another yr or two.

http://www.youtube.com/watch?v=WTyPf...ature=youtu.be

[Azonic]

Nice vid Joe!

Nice to see you got the coupler on again, got it to work with the new controler?

[Lil Giants]

Thanx Kalle, the coupler is working xllnt (hope I didn't jinx myself admitting that out loud lol), makes quick work changing buckets/ect, getting pretty good at doing quickly too.

No, I kept the 2pos controller, I got the timing just right now. I didn't want to have rely on my counting every time & it's impossible to hear if the furnace is running. I used a dab of red locktite on the union, probably stronger than epoxy.

Something odd though, sometimes while using the tracks, especially turning, the high amp draw on the 2x25 some how causes the 2pos esc to activate, the pins cycle in then out again. Were you using a 2pos esc too? This ever happen to you?

[Espeefan]

Originally Posted by Lil Giants

Thanx Kalle, the coupler is working xllnt (hope I didn't jinx myself admitting that out loud lol), makes quick work changing buckets/ect, getting pretty good at doing quickly too.

No, I kept the 2pos controller, I got the timing just right now. I didn't want to have rely on my counting every time & it's impossible to hear if the furnace is running. I used a dab of red locktite on the union, probably stronger than epoxy.

Something odd though, sometimes while using the tracks, especially turning, the high amp draw on the 2x25 some how causes the 2pos esc to activate, the pins cycle in then out again. Were you using a 2pos esc too? This ever happen to you?

Joe, just a thought - are you running an external BEC, or receiver battery pack? If you are running on the ESC's internal BEC, a heavy current draw can over tax the ESC, and the internal BEC circuitry starts acting weird, or can cut out and make servos, or anything else plugged in, act strange or glitch.

[Lil Giants]

That's probably what it is then Nathan, the Sabertooth is providing the BEC. I'd rather use the E-Flite's BEC, but I have found that disconnecting the red wires from the Sabertooth rx leads, then the Sabertooth does not work.

[fhhhstix]

Originally Posted by Lil Giants

That's probably what it is then Nathan, the Sabertooth is providing the BEC. I'd rather use the E-Flite's BEC, but I have found that disconnecting the red wires from the Sabertooth rx leads, then the Sabertooth does not work.

If you are using a separate BEC then the red wires from the sabertooth being unhooked should be fine. My CAT tractor, Track loader, and dozer all use a separate BEC and the red wires are pulled from the plug and the sabertooths work just fine. The sabertooth I bought for the CAT tractor came with an external BEC and the red wires are not even in the harness going to the esc just the ground and signal. I do know one thing for sure never unhook the ground or the signal wire has nothing to get a base reading from they work together.


Travis

[tracksntreadslou]

Joe the Globe looks as though it has alot of scale miles on her or should i say Klms..Is that one of your first trucks and what year did you get it ?

[Lil Giants]

Travis, currently in the 850 there is two Sabertooths, 2x12 & 2x25, both esc's have the red wires installed.. that should give me more than enough current?

My Stahl adt, the BEC from the 2x12 wasn't enough to power the rx, so I added an external 4.8v batt too.

The 2x10 in my last Stahl excavator, same problem with a 2x12, added a 4.8v rx batt. Both the Stahl hoe & adt have the red wires installed with an external batt, what is the reason to have either or, but not both? Or is it not to have two esc's providing BEC together? ..although I'm doing that in the 850.

Lou, it's #2.. originally my short KH 6x4, 2002. I swapped frame rails with a GL that I bought at the same time #3, that GL later became the green 6x6. Then I made that KH short trk a 6x6 and added the white GL body from an ebay parts trk I got in '06 maybe. Motors, trans & frame rails would be all that's original since building it the 1st time, everything else has been R&R'd a few times. This trk would definitely have a few hundred thousand scaled kms, pulling that bd trl 99% of the time.

[Espeefan]

Joe, speed controllers with internal BECs have limitations in what current they can supply to the other loads you are powering. Often times the BEC voltage and current is listed in the spec sheet for each speed controller. The catch is the max current rating is usually decreased, as input battery voltage increases. A speed controller might be able to supply 6 volts and 5 amps, running a 7.2 volt battery pack, but when you bump the voltage up the BEC capacity decreases. Or under a heavy load, the internal BEC just can't keep up, especially when the speed controller is already driving some power hungry motors, consuming a lot of current. Your ESC either thermals and shuts down, or the servos get glitchy.

I'm all for running external BECs in such situations. It's the best way to solve the problem. By doing so, you are relieving the ESC of two jobs. Running a motor, and supplying power to your servos, via the internal BEC. In high performance applications, where every little bit counts, running an external BEC will allow the speed controller to put everything into the motor(s).

In the case of running dual (or more) speed controllers on one model, people sometimes recommend you pull the power wire out of the additonal speed controller's plug and let just one speed controller's internal BEC handle powering the servos. I think otherwise, and here is why. If your speed controllers are identical, then the internal BEC voltage and current output of each speed controller will be identical too. The internal BECs will work together, just like dual battery packs in parallel, which basically means the current draw will be split between the two internal BECs. Make sense? I think it does, and I have run dual motor models this way with no ill effects, and no external BEC. The key is to make sure you turn the power switches 'on' for both ESCs, even though turning just one 'on' will power up the other automatically. I used to run my dual motor, dual ESC rock crawlers like this. It worked just fine for me, and that was powering two power hungry high torque steering servos, plus the drivetrain motors.

Now in the case of running an external BEC, I definitely agree that the power wires for each ESC should be pulled out of the plug. The ESCs will all power up together, as soon as the external BEC is switched 'on'. No big deal. Or you could run a separate rx battery pack too. Either way, the results are the same. I would not recommend trying to use the speed controller's internal BEC along with a battery pack, or an external BEC. Reason being is the voltages could be very different, and you might burn something up. Some external BECs are voltage adjustable, and some aren't. Best to just let the external BEC work alone in either case.

I hope this helps and makes sense.