1/10 Caterpillar D8T Build (3D Printed)
 

Just started on this very challenging build..

https://i.ibb.co/TRQgksr/CAD-03.jpg https://i.ibb.co/B45TgD6/Untitled.jpg

https://i.ibb.co/mGKYncv/20230117-025401.jpg https://i.ibb.co/rt9nNM4/20230119-014912.jpg

Re: 1/10 Caterpillar D8T Build (3D Printed)
 

steering and throttle program mix on my Radiolink RC6GS pistol radio...
https://youtu.be/knUPPHZKtQg

Re: 1/10 Caterpillar D8T Build (3D Printed)
 

That looks like a really good start!

Which 90 deg. gearmotors are you using for this?
Any idea how much force those tracks can hold before something goes pop?

Re: 1/10 Caterpillar D8T Build (3D Printed)
 

This one, 12v-65rpm, quite big and heavy too. 8mm shafts and 4mm mounting screws...
well, this build will be mostly for show and for the pleasure of seeing it run, so yeah, dont really know whats the max stress the tracks can hold, lets just see how long till the first one explodes...

https://i.ibb.co/8m0BgJj/12v-65rpm-gear-motor.png

Re: 1/10 Caterpillar D8T Build (3D Printed)
 

Thank you, i thought it looked like that's what you were using. I'd been considering those for a project. Any idea what size motors those use?

Sorry, I wasn't sure if you were planning to try staying plastic track, or prototype a few then send it off later to be printed in metal.

Can't wait to see this one come together

Re: 1/10 Caterpillar D8T Build (3D Printed)
 

Did some research and found out the motors are permanent magnet motors 31ZY, might be 4000 rpm, 3mm motor shafts with screw gear installed, 12v at 65 rpm output on the gearbox shaft ... I used 2s lipo batts at first but the 7.2 volts seem to be underpowered, i changed to 3s and they seem to work well at 11.1 volts since the motors are rated at 12 volts. Im tempted to try a 4s pack but im afraid it might burn the motor out.

Re: 1/10 Caterpillar D8T Build (3D Printed)
 

Rolling chassis is ready for a test run...

https://i.ibb.co/Dww8pxJ/20230124-021056.jpg https://i.ibb.co/D7LnK2m/20230124-021102.jpg

https://i.ibb.co/hDQZ8Mm/20230124-021111.jpg https://i.ibb.co/80LDXXS/20230124-021227.jpg

and the motor test...

https://youtu.be/Cv8Vz40k5Qg

Re: 1/10 Caterpillar D8T Build (3D Printed)
 

Wow your really moving along on this one.....looks like the drive train test was a success speed look pretty good....

Re: 1/10 Caterpillar D8T Build (3D Printed)
 

At first i thought it was too slow and underpowered with a couple of 2S lipo batts, but when i changed to a 3S set, it changed dramatically.... and i think the speed kind of matches the full scale ones at full throttle... i had it climb a 20 degree incline and it climbed pretty good until the tracks starts sliding on a smooth wood surface lol... i think im ok with the power system and it did not get hot at all (motor & esc)... so i call it a success. thanks

Re: 1/10 Caterpillar D8T Build (3D Printed)
 

Yeah good call, 3s makes more sence for the 12v motors.
3.7v, 7.4v, 11.1v

Your prints are looking really nice

Re: 1/10 Caterpillar D8T Build (3D Printed)
 

Latest update on this build... im now designing the actuators using a small gearmotor with an M3 lead shaft at 65 rpm, this will be the actuator to tilt the rippers

https://i.ibb.co/dBS5kdt/20230201-234903.jpg https://i.ibb.co/8N03P3c/20230201-234933.jpg

https://i.ibb.co/XXtKVXn/20230201-235004.jpg https://i.ibb.co/3zr7xww/20230202-000429.jpg

https://i.ibb.co/kc6NpmH/20230202-000459.jpg https://i.ibb.co/fGKVF9Q/20230202-000525.jpg

Re: 1/10 Caterpillar D8T Build (3D Printed)
 

Thanks, I actually do post print processing to smoothen the edges and re drill the holes etc... the bottom of the print usually flare out on my ender 3 so i have to file it off more so when i have to join two parts together, i just hate cleaning up material removed from the prints lol...

Re: 1/10 Caterpillar D8T Build (3D Printed)
 

Gearmotor actuators for the rippers is done and installed...

https://i.ibb.co/mc929KV/20230204-220556.jpg

test vidoes...

https://youtu.be/BsQvf6rvS60

https://youtu.be/zY9LS37m5LU

Re: 1/10 Caterpillar D8T Build (3D Printed)
 

Are they just N20 motors....

Re: 1/10 Caterpillar D8T Build (3D Printed)
 

It looks like you are controlling the motors with just a toggle switch. Do you have any end limits on your actuators?

If you have the limits installed, I'd be very interested in seeing how you pulled that off. I've got several projects in the works where end limits on the actuators would be nice to have, but as usual with most RC projects, space is at a premium. Ten pounds in a five pound sack is a good description for a lot of projects.

You said that you are using the M3 version of the gearbox with the threaded rod output as your actuator screw. What are you using for the nut? I know you've got this type of actuator on your powered ramps, but they won't get used as much as the ripper will, or the blade if you use the same type of actuator there. Any concerns about lubrication and/or wear of the screw/nut?

Don

Re: 1/10 Caterpillar D8T Build (3D Printed)
 

I had to play around with the transmitter to get my settings just the way i wanted it, for the end point (EPA) of both ch 5 & 6, i think its just 20% both ways, and then i had to adjust the subtrim to make the servo horns be inline with the toggle switch... on the other hand, if you are asking about the end point where the motor reaches the longest or the shortest, i just play by feel and sound also, had to wait to hear till the motor starts to slow down and then hit the controls to center the servo, i use the on-off-on toggle switch so it stays when i flick the tx switch.. i was thinking of installing limit switches but with all the wires and switches, i wont look realistic anymore, not worried about cooling or lubrication either coz you only get to use it a few seconds or maybe minutes at a time to adjust the ripper, so it is fully enclosed as you can see...i use a regular m3 nut inserted at the bottom of the actuator rod, but 60rpm at the lead shaft and the M3 threads, it is kinda slow so i ordered the 200rpm ones and see if they will work better. Now, on the blade actuators, i will have to use a faster gearmotor and open the case a bit to have some bit of cooling and some grease on the lead shaft.. also since the 2 actuators will move independently, i may have to use ch 3 & 4 for each

Re: 1/10 Caterpillar D8T Build (3D Printed)
 

Not really familiar with the motor type...but this is it...they are small..

https://i.ibb.co/HCg6VdF/2023-02-06-...Thread-Out.jpg

Re: 1/10 Caterpillar D8T Build (3D Printed)
 

Yeah those are n20s.. I have some like that of various rpm's so I can make my own cylinders like you did... been kicking the idea around for a while now just haven't started on them..
Did you print the inside of the cylinder to fit the nut or just press it in.... I have some of the brass press in threads I want to try too....

Re: 1/10 Caterpillar D8T Build (3D Printed)
 

all parts are printed...and the nut has a slot at one end of the rod where i insert a nut... these are the complete parts of the longer cylinder...

https://i.ibb.co/5xdVMhN/cylinder-1.jpg

Re: 1/10 Caterpillar D8T Build (3D Printed)
 

I see.....
The rod, a cylinder in a cylinder... so you don't see the rotation... That was my thought...
It looks good in 1/10 I'm not sure if I can get everything small enough to look right in 1/16.
I might have to just deal with seeing one cylinder rotating....
But thank you for showing the exploded view it helps a lot...

Re: 1/10 Caterpillar D8T Build (3D Printed)
 

Yup, the lead shaft is not exposed... so far this has been the smallest gearmotor i could find which works great in 10th scale... not sure if there is another one smaller than this.

Re: 1/10 Caterpillar D8T Build (3D Printed)
 

I found some 10mm motors with planetary gearboxes that I will be using to extend the stabilizers on my Manitou 2150, I think they are 300rpm. (There are listings similar to the gearboxes I got on Ebay now, just look for 10mm gearbox.) Using an M3 threaded rod as the screw they would move at about 2.5mm/second. The stabilizers have about a 70-80mm travel so I figure it'll take about 20-30 seconds to extend/retract the stabilizers. It works in the 3D model anyway - real-life might be another story.

I originally planned on driving the motor with a 10A ESC, but that would use 8 channels just for the stabilizers. I'm currently looking into auto-leveling using an Arduino and a gyro chip. I had planned on the Arduino running the lights anyway so I might as well make it earn it's keep. But that's a whole 'nuther rabbit hole.

Re: 1/10 Caterpillar D8T Build (3D Printed)
 

Blade is ready....
https://i.ibb.co/jLhR7XY/20230213-021652.jpg https://i.ibb.co/qpL3bBr/20230213-021704.jpg

Re: 1/10 Caterpillar D8T Build (3D Printed)
 

That is beautiful... You have got some great CAD skills

Re: 1/10 Caterpillar D8T Build (3D Printed)
 

Thanks, took me a while to figure out the shape of the curved sides and i settled with a section of a sphere chopped off a certain distance from the center. This thing is huge and impossible to fit in my 1st gen ender 3 so i had to print in sections... 1 of the 3 sections took 20 hrs to print... 3d printing is truly a hit or miss thing lol...

https://i.ibb.co/BBbwPLk/CAT-D8-T-blade-CAD.jpg

Re: 1/10 Caterpillar D8T Build (3D Printed)
 

Build update for today... almost done with the blade, just waiting for blade swing cylinder to finish printing so i can fix the blade and it doesnt swing from side to side...

Here is my CAD model/rendering... and the printed/assembled parts...

https://i.ibb.co/qM1Xm4p/BUILD-UPDATE-02-18-2023.jpg https://i.ibb.co/K55FGs2/20230217-235731.jpg

https://i.ibb.co/rs0dsZX/20230217-235819.jpg https://i.ibb.co/2gDdVgp/20230217-235855.jpg

Re: 1/10 Caterpillar D8T Build (3D Printed)
 

Impressive work. I'm looking forward to seeing future updates :popcorn:

Did you add any weight to the blade?



-Shawn-

Re: 1/10 Caterpillar D8T Build (3D Printed)
 

Im thinking of using a 1 1/2" x 1/8" thk flat bar as blade tips, cut in sections just like the real ones, that would be the weight on the blade...

Anyway, another update with the installation of the headlight mount and the blade swing cylinder, (unpowered)..

https://i.ibb.co/ftBshxK/20230219-173523.jpg https://i.ibb.co/dgxcF6w/20230219-173608.jpg

https://i.ibb.co/wMTZjCx/20230219-173548.jpg https://i.ibb.co/RjSTgDB/20230219-173602.jpg

Re: 1/10 Caterpillar D8T Build (3D Printed)
 

Latest build update....hood and ROLPS is done...now working on the 3d model of the cab and fuel tank...

https://i.ibb.co/tbwFcpZ/20230226-235517.jpg https://i.ibb.co/HtzPrR0/20230226-235653.jpg

https://i.ibb.co/yP7CMS3/20230226-235438.jpg https://i.ibb.co/jD4c6py/20230226-235616.jpg

Re: 1/10 Caterpillar D8T Build (3D Printed)
 

I can't even begin to wrap my head around the work you must have put into this to achieve that much detail.... :jaw:


I couldn't do it....

Re: 1/10 Caterpillar D8T Build (3D Printed)
 

Thanks, i do like to challenge myself a little bit and it gives me so much satisfaction when i get to figure out a shape in autocad 3d considering that i have to manipulate the WCS to be able to model something working only with basic shapes like cylinder, box, torus, sphere, cone, etc.

Re: 1/10 Caterpillar D8T Build (3D Printed)
 

That's really an amazing looking build!

It will be interesting when you're done to estimate how many hours you think you've probably got into the cad modelling, vs the parts prep and building

Can't wait to see this ready to bulldoze stuff.

Re: 1/10 Caterpillar D8T Build (3D Printed)
 

Thanks, this would probably end up like a demo build, not sure of the power train being able to push dirt but when i tested it, it can pretty much climb a 30 degree incline but lets see... i can say 3d modeling really takes more time than printing and assembling but im excited to see how it would look when finished and painted.... ill keep you guys posted...cheers.

Re: 1/10 Caterpillar D8T Build (3D Printed)
 

Update on the build... done with the cab deck, fuel tank, hydraulic oil tank, etc... time to design and build the cab...

https://i.ibb.co/2KkNqPr/20230305-125018.jpg https://i.ibb.co/SsBtHyC/20230305-124751.jpg

https://i.ibb.co/QPNgKgv/20230305-124848.jpg https://i.ibb.co/Fn8dYS3/20230305-124918.jpg

https://i.ibb.co/Y0cLQRk/20230305-125028.jpg https://i.ibb.co/zQWJJ2Z/20230305-124802.jpg

Re: 1/10 Caterpillar D8T Build (3D Printed)
 

Cab is done...cab interior is next...

https://i.ibb.co/PNsJf1S/20230323-223230.jpg https://i.ibb.co/xzF4jb2/20230323-223350.jpg

https://i.ibb.co/2FbgKqZ/20230323-223439.jpg https://i.ibb.co/rFqm5Vt/20230323-223507.jpg

https://i.ibb.co/N6QMBVL/20230323-223520.jpg https://i.ibb.co/k1xWkgY/20230323-223538.jpg

https://i.ibb.co/q9cnbKP/20230323-223631.jpg https://i.ibb.co/yyJLy9J/20230323-223726.jpg

https://i.ibb.co/XpWV1zP/20230323-223646.jpg

Re: 1/10 Caterpillar D8T Build (3D Printed)
 

test run today....

https://youtu.be/VJCjNo2JGh0

Re: 1/10 Caterpillar D8T Build (3D Printed)
 

WooHoo... all the engineering worked...this is going to be killer when you get done...

Re: 1/10 Caterpillar D8T Build (3D Printed)
 

Quite amazing what can be accomplished with 3D printing in modern times, looks fantastic! Have you kept a separate tally of hrs in design & print?

Re: 1/10 Caterpillar D8T Build (3D Printed)
 

thanks... i need to do another test video to show movement of the blade and ripper...

Re: 1/10 Caterpillar D8T Build (3D Printed)
 

thanks, just a rough estimate would be around 220 hrs for design and maybe half of that for the prints... i have used 4 spools more or less since i started this build.