RC Giant Scale Cars For all those who love driving large scale rc cars share your projects or ask questions here.

Home Built Baja 5T-PTV (Personal Tracked Vehicle)

Reply
Old 03-24-2010, 03:14 PM
  #76
Paul1981
 
Join Date: Sep 2009
Location: Manchester, UNITED KINGDOM
Posts: 136
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Home Built Baja 5T-PTV (Personal Tracked Vehicle)



Gorgeous looking truck Brice.  Make sure you hire an armed guard for this one though; I for one don't want to see any more of your projects vanishing...! 

Paul1981 is offline  
Reply With Quote
Old 03-25-2010, 11:58 PM
  #77
brice_arnold
Thread Starter
 
Join Date: Jan 2004
Location: Los Altos Hills, CA
Posts: 491
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Home Built Baja 5T-PTV (Personal Tracked Vehicle)

So I never got around to posting gearbox pics. The gearbox is made up of 15 gears and four clutches. Each track can independently be shifted proportionally from forward to neutral to reverse. What this means is that the shifting is done with clutch plates and by design is a soft gradual shift. It's not on or off. This show allow for smooth controls.

Here is a video of the gear box in action from forward to reverse.

http://www.youtube.com/watch?v=OVRBeCuj4PY

Here are all the parts in the gearbox







This is the input gear/gearbox cover



These are the shifter mechanisms. Basically the shifter is an acme screw that is coupled to a shifting gear. The gear has clutch plates and moves between a forward powered gear and a reverse powered gear.



This is the powered reverse gear assembly





This is the differential assemble that generates forward and reverse gear motion from the input gear.





Here are the output and forward powered gears installed in the case halves



Here is the gearbox almost ready to get bolted together



The shifter assembly installed onto the gearbox



The complete gearbox

brice_arnold is offline  
Reply With Quote
Old 03-26-2010, 12:21 AM
  #78
brice_arnold
Thread Starter
 
Join Date: Jan 2004
Location: Los Altos Hills, CA
Posts: 491
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Home Built Baja 5T-PTV (Personal Tracked Vehicle)

Just did a weigh in today and it came in at 76 lbs. This is what I expected. So I think it's safe to say that this is the worlds heaviest baja if you can still call it a baja.

To offset it I also just finished building what I believe to be the worlds lightest baja at 11lbs-14.5oz

brice_arnold is offline  
Reply With Quote
Old 03-26-2010, 12:22 AM
  #79
snoking16
 
snoking16's Avatar
 
Join Date: Nov 2005
Location: Kenmore, WA
Posts: 2,529
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Home Built Baja 5T-PTV (Personal Tracked Vehicle)

OMG
snoking16 is offline  
Reply With Quote
Old 03-27-2010, 08:56 PM
  #80
Monsterman--HBF
 
Monsterman--HBF's Avatar
 
Join Date: Mar 2003
Location: Long Island, NY
Posts: 724
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Home Built Baja 5T-PTV (Personal Tracked Vehicle)

Brice

You never stop amazing me man! Your ideas and builds are by far the baddest and the sickest out there! You are for sure a Mad Scientist :lol:
Monsterman--HBF is offline  
Reply With Quote
Old 03-27-2010, 10:47 PM
  #81
brice_arnold
Thread Starter
 
Join Date: Jan 2004
Location: Los Altos Hills, CA
Posts: 491
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Home Built Baja 5T-PTV (Personal Tracked Vehicle)

Thanks for the kind words guys. I got some footage today. We will try and get a teaser video up in the next day.
brice_arnold is offline  
Reply With Quote
Old 03-28-2010, 01:00 AM
  #82
savtraxx
 
Join Date: Feb 2008
Location: newcastle, AUSTRALIA
Posts: 325
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Home Built Baja 5T-PTV (Personal Tracked Vehicle)

can i ask you a serious question?

when you arent playing with toys are you a rocket scientist?



amazing..
savtraxx is offline  
Reply With Quote
Old 03-28-2010, 01:50 PM
  #83
brice_arnold
Thread Starter
 
Join Date: Jan 2004
Location: Los Altos Hills, CA
Posts: 491
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Home Built Baja 5T-PTV (Personal Tracked Vehicle)

Ok guys here is a teaser video. First run proved to be promising. There are a couple of bugs that I still need to work out.

1. The receiver I used is a cheapie FM receiver. It was very susceptible to RF noise coming from the ending. This caused the servos to go crazy and made it very difficult to control. I will be upgrading the receiver to a DSM 2.4 Ghz system.

2. I didn't use loctite on the track bearings so I started to lose screws and bearing towards the end of the trial run.

Enjoy.

http://www.youtube.com/watch?v=rANs8Ll0hf4
brice_arnold is offline  
Reply With Quote
Old 03-28-2010, 02:13 PM
  #84
DarkFire989
 
DarkFire989's Avatar
 
Join Date: Jan 2007
Location: Northborough, MA
Posts: 6,626
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Home Built Baja 5T-PTV (Personal Tracked Vehicle)

Looks good brice. It did seem kinda wacky in the vid.
DarkFire989 is offline  
Reply With Quote
Old 03-28-2010, 02:32 PM
  #85
brice_arnold
Thread Starter
 
Join Date: Jan 2004
Location: Los Altos Hills, CA
Posts: 491
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Home Built Baja 5T-PTV (Personal Tracked Vehicle)

Yep, the servos literally had a mind of their own moving back and forth non-stop.
brice_arnold is offline  
Reply With Quote
Old 03-28-2010, 02:52 PM
  #86
DarkFire989
 
DarkFire989's Avatar
 
Join Date: Jan 2007
Location: Northborough, MA
Posts: 6,626
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Home Built Baja 5T-PTV (Personal Tracked Vehicle)

Hows the engine doing? Does it struggle at all?
DarkFire989 is offline  
Reply With Quote
Old 03-28-2010, 07:27 PM
  #87
brice_arnold
Thread Starter
 
Join Date: Jan 2004
Location: Los Altos Hills, CA
Posts: 491
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Home Built Baja 5T-PTV (Personal Tracked Vehicle)

Nope the engine is a powerhouse and it's geared perfectly. When the servos randomly engaged the clutches the tank would rear up on it's end. Lot's of torque. It reminded me of the ripsaw videos.

You figure these motors have been used on go-peds to get a 200 lb person up to 60 mph so it shouldn't have any problems with my little tank.
brice_arnold is offline  
Reply With Quote
Old 04-11-2011, 07:08 PM
  #88
lithiumx152
 
Join Date: Feb 2011
Location: charleston, MO
Posts: 137
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Home Built Baja 5T-PTV (Personal Tracked Vehicle)

my brain hurts
lithiumx152 is offline  
Reply With Quote
Old 04-13-2011, 08:01 AM
  #89
Nitro Fumes
 
Nitro Fumes's Avatar
 
Join Date: Feb 2006
Location: Marietta, GA
Posts: 714
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Home Built Baja 5T-PTV (Personal Tracked Vehicle)

That's a fantastic project! You sure have done a lot of work. But how are you going to make it steer? Are putting a differential brake system with a brake on each rear "wheel"?
Nitro Fumes is offline  
Reply With Quote
Reply


Thread Tools
Search this Thread
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -8. The time now is 06:47 PM.