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Tri-Track dual servo robot tank chassis

by Ktronics, published

Tri-Track dual servo robot tank chassis by Ktronics Dec 14, 2011

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Description

Tri-Track robot chassis is based on Sublime 100mm wheel base track system. This design incorporates dual servo motors that are mounted above the chassis. This design allows for mounting a robot body or arm between the tracks. The battery pack and electronics will be moved as the design progresses.
Frame has been significantly strengthened to accommodate for the added stresses and to increase weight capacity.

UPDATE

12-20-11
Added platform base for mounting robot body or arm.

12/21-11 Added additional files

1-08-12
Rendered BaseLeft and BaseRight in two pieces, this enables them to be printed on a MakerBot. The two piece files are: BaseleftP1, BaseleftP2, BaserightP1, BaserightP2

There are errors in the Tri-Track Frame file. This fils is still printable. We are working on correcting errors.

1-12-12
Redesigned and added New Tri-Track Frame for Solid Axle construction. File Name: Tri-Track Frame For Solid Axle v1

Short video of Tri-Track in motion:

youtu.be/KcNyt-GK2NU

My plan is to build a two armed robot around this motorized platform.

CREDIT

Original Track design by Olalla
See thingiverse.com/thing:8559

Servo Mount is by Hoeken. thingiverse.com/thing:5165 This is printed horizontally for strength.

Recent Comments

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I used plastic dip. Its for dipping your tools in so they have rubbery surfaces. its sold at home depot, and its more rubbery than the rocker guard.

Im still trying to figure our electronics.

are there any more videos of this in action?

Hi. i just tried to start printing but whether skeinforge nor the newest slic3r will slice the Tri-Track Frame.stl - both throw some errors, slic3r doesn't even render anything.

Does anyone else have other experiences with the actual files?

Yeah. Johnny5 rulz!

Makes

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Instructions

Instructions and files will be added as the build progresses.



1 - Tri-Track Frame for Solid Axle
44 - Track Sections
2 - sprockets
4 - 608 sprockets
4 - 608 Bearings
2 - Servo Mounts
1 - Base Left
1 - Base Right



Comments

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Helmi74 on Mar 22, 2012 said:

Hi. i just tried to start printing but whether skeinforge nor the newest slic3r will slice the Tri-Track Frame.stl - both throw some errors, slic3r doesn't even render anything.

Does anyone else have other experiences with the actual files?

Arvin on Mar 18, 2012 said:

Yeah. Johnny5 rulz!

deeply on Jan 15, 2012 said:

The frame is too large for the ABP. I used openSCAD to clip the ends of the solid axle model, which had enough room and is still stable. For openSCAD users:

intersection()
{
import_stl("Tri-Track_Frame_For_Solid_Axle_v1.stl");
cube([96,115,115], center = true);
}

F6 to compile and render. Then export as stl.

We've enjoyed making this design, thanks!

Ktronics on Jan 16, 2012 said:

I own a MakerBot but I print most of my parts on a Mendel Prusa. As I have time I will split large parts into two pieces so that they can be printed on all printers. I am currently designing parts for a robot that mounts on top of this track frame. Thank you for your interest in my project.

jimcook on Jan 10, 2012 said:

Thanks for the multiple parts for the base left and right.

I'm not sure if the tri-track frame will fit the TOM platform. Maybe it too needs to be split into parts.

Anonymous on Jan 13, 2012 said:

I tried to "Save Target as.." to the new "Tri-Track Frame for Solid Axle V1.stl" but it keeps downloading as an HTML document. THis is driving me nut. What am I doing wrong? All the other files download properly.

Dogbert on Jan 7, 2012 said:

Firstly... Love your work! It looks fantastic!

Question for you... In Netfabb basic, I'm trying to do a 'duplicate' of the tracks and then save them as one bigger STL, however, Netfabb won't let me save them all as one, even if I have them all selected. I've even tried putting them into a group (on the right) but to no evail.

how can I save them all to one STL?

Ktronics on Jan 8, 2012 said:

Hi Dogbert,

Thank you for the kind words. I am not familiar with Netfab, but with other Cad software I use the Import function to add STL files. I uploaded a new STL file called Track Plate, this plate has 4 track segments and will fit on a MakerBot platform. If you or anyone else wants a larger plate let me know and I will build one. I wish I did this when I printed my track segments.

jimcook on Jan 5, 2012 said:

Am I correct in saying that the tri-track frame, baseleft and baseright will not fit on the TOM platform? :'(

Ktronics on Jan 9, 2012 said:

Rendered BaseLeft and BaseRight in two pieces, you should be able to print these on your MakerBot. The two piece files are: BaseleftP1, BaseleftP2, BaserightP1, BaserightP2

Ktronics on Jan 6, 2012 said:

Thank you for bringing this to my attention. The Base Right and the Base Left parts are 82mm x 138mm. I may be able to add a lap joint at the top portion of the parts. This will allow the parts to be printed in two pieces for smaller build platforms. If possible I will release large parts with two versions a one piece and two piece.

ccotter247 on Dec 20, 2011 said:

When are we allowed to have the chassis! I really want one. :)

Ktronics on Dec 21, 2011 said:

I am working on releasing the chassis. I hope to have this released soon, sorry for the wait. My prototype chassis did not have the screw holes for mounting the servos. I have just completed the platform to mount a body or arm.

Thank you for your interest in my project

Olalla on Dec 20, 2011 said:

This is really cool!!

I love seeing that my original tracks are adapted to other people's designs :)

Ktronics on Dec 21, 2011 said:

You
’re original track design is inspiring new designs :)

LukeChilson on Dec 19, 2011 said:

Looks great! Have you managed to get a feel for the kind of traction these treads have?

Ktronics on Dec 21, 2011 said:

This travels very well on smooth surfaces and carpet. With this being a skid steer design it seems to prefer a smooth surface. I am considering adding some kind of grip tape or dip the outer track in a liquid rubber. This should allow the Tri-Track design to really climb.

jimcook on Dec 16, 2011 said:

Ktronics,

I just uploaded a picture of my first track. I'm very impressed on how well it flexes.

Do you plan on sharing the chassis, bearings, axels, electronics and servo mounts?

Thank you.

Olalla on Dec 20, 2011 said:

For using another sizes for the tracks, you can go to http://www.thingiverse.com/thi..., which is from where Sublime derivated its wheel-track system.

There you have the scad files which are parametrized.

Ktronics on Dec 17, 2011 said:

Jimcook,

You can thank Sublime for the nice track segments. I will be sharing two chassis designs; one will have the original 606 bearings on the chassis and the sprockets, the other will use a solid design with only the 608 bearings on the outer sprockets. All electronics and mounts will also be provided. I am currently designing a platform that will attach to the chassis to support the body of a robot or arm.

Your copy looks great, as a finishing touch to my pins I used a micro torch to heat up one side of a slotted screwdriver. With about 2mm of filament exposed on each side I pressed the opposite side of the screwdriver to the filament to melt it to form a flat edge similar to a nail or rivet.

SayNoToMakerbot on Dec 15, 2011 said:

As I said on my thing. I DO NOT USE OPENSCAD so there are no openSCAD files used since Olalla created the originals. If you insist on having a SCAD file for it may I suggest you do it yourself instead of just complaining. That is why I gave the size changes on my original so if someone wanted to recreate it they could do so easily.

avalero on Dec 16, 2011 said:

Not complaining, just saying that if we want Open Source to work, licenses should be respected. But I did not want to bother anyone. I apologize for the comment if you consider it inappropriate.

Ktronics on Dec 15, 2011 said:

I played around with different servo mountings. It came down to personal preference and looks.

brucedjones on Dec 15, 2011 said:

If you mount the servos the other way up you wont need so much extra track. You could also lie them sideways for lower centre of gravity.

jimcook on Dec 15, 2011 said:

Will you be using the sprockets from the 100mm design?

Ktronics on Dec 15, 2011 said:

Yes, this design uses (4) 608 sprockets on the axles and (2) solid sprockets on the drive servos. At this time I left the axles at the original design, but I did not want the tracks to drive the axle through to the opposite side.

MTO on Dec 14, 2011 said:

This design just says to me "Johnny5 is alive!" like nothing else.

EvoGenius on Dec 15, 2011 said:

INPUT! INPUT!!!!

Ktronics on Dec 15, 2011 said:

Thank you, this was Johnny 5 inspired

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