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johann517

Spider Rover

by johann517 Sep 19, 2014
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Hello, I would like to make this, but with some modifications, do you perhaps have the step files for the parts? or in any editable format?

Thanks, and great design!

No sorry. This was one of my first designs some years ago and i used Openscad ;-)

Thanks Johann, I have managed to convert and re-model all the files and have begun printing. I have modified the drive and all of the "levels" of the decks to accommodate an Arduino RC Motor. While assembling the parts on CAD I have one question, how do you assemble the "leg control al50 delta" part to the "leg gear washer fix" part?

Hi Kameel, you have to bend the "leg gear washer fix" part apart and squeeze it on the "leg_gear" and at the same time you can add the leg control. For this it is a good advice to have them printed in 100% infill PLA and some extra prints - they can break if you are to agressive in trying. Further you should use another pulley design because mine is to big in diameter for weaker motors. I have used a motor with gearbox
attached and this was ok, but in general i think a smaller pulley is a major improvement.

I want the one which can climb wall! :D
I'm joking. but I know there is some drones which really have the ability to climb glass walls.

My attempts to post a video from my iPhone failed. I will find another way to copy to Mac and post from there. Also, I plan to move the motor inside the compartment and add a battery. Thanks for this wonderful 'thingy'.

You really make it thrilling but you did an amazing job already.
Many thanks!

Overall, the project turned out to be fruitful. Amazing design with just one motor. What follows are the hardships that I faced while building it and they in no way are criticisms. Just thought it might help someone looking to build the spider.

  1. Printing the parts in my Da Vinci 1.0 (btw, it is over 2 1/2 years old, going strong, except recently I had to remove a connector near the extruded and solder them directly) was a no brainier for all but the worm gear. Tried the other one with the support from the remix, but my printer did not like them at all. Spent several hours trying to cut it half with Sketchup, but failed as there is a steep learning curve. Finally, saw a you tube video showing how to do it in Tinkercad and half hour later, was printing the two halves. Later, putting them together with glue was easy, but had to file to get a smooth finish.

  2. All parts with holes (and there are many) had to be resized with filing extensively. This was a lot time consuming when you consider the number.

  3. The worm gear ends have to be carefully trimmed as well, to make sure the shape is not altered. My bearing's outside diameter was a bit short and i had to fill the gap with a plastic ring I cut from my old printed part.

  4. When you put together anything that moves, you have to make sure they do without any friction. I had to disassemble numerous times to widen the holes to have smooth movement.

  5. Spent a lot of hours with a decent sized DC motor, but the torque wasn't enough. I had a bigger DC motor and all my problems went away. The spider started to move without skipping a beat. The old motor, I could stop with my fingers, but the new one, I couldn't. That may give you some hints as to the torque we are looking at to move this baby.

All in all, well worth the effort. To be honest, I was about to give up until I tried the new motor...

Thanks.

Congratulations! Nicely done:) I almost thought you will not post your results anymore since you first
message was more than two weeks ago. Sorry to hear you had so many troubles printing the worm gear.
This was one of my very first designs for 3D printing. Meanwhile i would do serveral things differently.
Especially the spacing between the parts was designed for a Ultimaker 2 which only newer printer
will do. I mean a slight higher printing temperature and the parts need sanding. So after all i'm surprised
you could do it with a 2,5 year old Da Vinci 1.0. To get it walking is only for the technical advanced
guys. Because of this, I first did not continue for several months on it and uploaded it almost half a year later.
The smaller the pulley on the motor the easier it will be to get it going.
Do you maybe have a video of your spider in action? This would be awesome to watch :D
Many thanks for all your hard work and sharing it!

Thanks a lot for your kind words Johann. I will shoot a video later tonight and post it. It was well worth the trouble, for one, the size of this thing was much bigger than what the photos seem to suggest. Pleasantly surprised.

Also, I plan to move the motor to the inside compartment soon. I need to run down to Ax Man to get a belt of the right size. And perhaps may also add a chargeable battery.

Thanks again.

Thanks a lot for your kind words Johann. I will shoot a video later tonight and post it. It was well worth the trouble, for one, the size of this thing was much bigger than what the photos seem to suggest. Pleasantly surprised.

Also, I plan to move the motor to the inside compartment soon. I need to run down to Ax Man to get a belt of the right size. And perhaps may also add a chargeable battery.

Thanks again.

Overall, the project turned out to be fruitful. Amazing design with just one motor. What follows are the hardships that I faced while building it and they in no way are criticisms. Just thought it might help someone looking to build the spider.

  1. Printing the parts in my Da Vinci 1.0 (btw, it is over 2 1/2 years old, going strong, except recently I had to remove a connector near the extruded and solder them directly) was a no brainier for all but the worm gear. Tried the other one with the support from the remix, but my printer did not like them at all. Spent several hours trying to cut it half with Sketchup, but failed as there is a steep learning curve. Finally, saw a you tube video showing how to do it in Tinkercad and half hour later, was printing the two halves. Later, putting them together with glue was easy, but had to file to get a smooth finish.

  2. All parts with holes (and there are many) had to be resized with filing extensively. This was a lot time consuming when you consider the number.

  3. The worm gear ends have to be carefully trimmed as well, to make sure the shape is not altered. My bearing's outside diameter was a bit short and i had to fill the gap with a plastic ring I cut from my old printed part.

  4. When you put together anything that moves, you have to make sure they do without any friction. I had to disassemble numerous times to widen the holes to have smooth movement.

  5. Spent a lot of hours with a decent sized DC motor, but the torque wasn't enough. I had a bigger DC motor and all my problems went away. The spider started to move without skipping a beat. The old motor, I could stop with my fingers, but the new one, I couldn't. That may give you some hints as to the torque we are looking at to move this baby.

All in all, well worth the effort. To be honest, I was about to give up until I tried the new motor...

Thanks.

Brilliant!!! Just printing the parts, will post how it all shakes out. Thank you....

Can you suggest the best leg positions to optimize the stride?

Look at the base preview with all the blue gears visible. The middle gear is 180 degree turned compared to the other gears of one side while the left and right side gears have a 90 degree difference.
So best is to take it in front of you and check with the picture to mount the gears.
http://thingiverse-production-new.s3.amazonaws.com/renders/25/ae/14/4e/75/base_preview_featured.jpg

Smaller belt pulley is required if you want to drive it without gear motor!

I love this design, could you make one that uses two motors so you can steer it?

where is moter's pulley?

where can I get the motor in the US?

Question: The bearings should be 8x14x4, correct? They seem to fit in the end hubs ok, but the worm gear seems a bit larger, say 9mm or so. Is that correct or is there a worm gear stl with slightly smaller end nubs out there?

thx.

Hi frogboots
you are completely right. For motor version and adding the ball bearings the ends of the worm gear need sanding to fit.
J

Comments deleted.

This is awesome! Only one critique...if I wanted to print this out for my 5yo daughter I know it would be too fragile. A smaller one with thicker pieces would be great for the little ones. If I get some time this summer I might do just that and base it off this design. I really like how you did so much with just 1 motor.

Hi looked at assembly of leg, got it now sorry for previous comment, regards

Hi Control leg engagement to the leg gear - hard to push on but then disengages in the bottom grove, any solution please.

What orientation should the shoulder be printed in?

The parts are oriented as they were printed. The shoulder is in standing orientation without support at 0.1mm.
For scaling down the shoulder can be be rotated so you can see the hole for leg control from the top, but then you
need support enabled.

someone has to say that this isn't a spider

I was just going to see if anyone had posted that yet.

It was kinda the first thing I thought of... But lets just assume it lost 2 legs in battle.

Or maybe a re-make is in order? ;)

ha ha creepy eye on top!

What motors are you using?
Can I order them online somewhere?

1:50 gear motor IGARASHI TYP 20G-50

I'm in the process of printing the parts and ordered the bearings and motor. Do you connect the motor directly to the battery (9v i guess) or is a controller needed? Is it safe to directly connect the motor to the battery (maybe with a simple switch to turn it on/off), without any controlling circuit?

Battery is connected over switch to motor. You can see the red pin of the switch in the video on the middle leg mount.

This is awesome! Any chance of a video?

better late then never - video is uploaded

You know what this needs?... a new center chassis with dual worm-drives so it can be controlled/made autonomous!
I'll see what I can do, I got the STL parts importing nicely into Solidworks...
I have 2 micro gear-motors screaming for a new home!

This looks great! I can't wait to try and get one of these working.
The mini one looks like tons of fun, but I am not sure I would be able to get the precision high enough on my printer... it'd be worth a shot, though!

I got the STL import working well, so I should be able to modify this to have dual worm drive!
On a somewhat unrelated note, my bed size isn't big enough for the big one, so 1/2 size it is!

Good idea! I think this will work from functional point of view.
What i would also like to have is a printer with at least twice the print bed size
I mean to print it big enough and ride this thing :)

I just finished a leg but have to print the rest of them and the large parts are going to be printed on a larger printer because I'm using a makerbot mini

I'm going to make one And I will finish might take a while

A piece count for printing would be helpful.

it's added to instructions now. Thanks!

Thanks. Built one at 50%. Trying to find a tiny motor now. Will post photos soon.