Marblevator, Mechanisms.

Introduction: Marblevator, Mechanisms.

About: Out of the office.

"Marblevator, Mechanisms" is the latest in my Marblevator series of marble machines and features the quickest marble lift mechanism I've ever designed. My fascination with gears, mechanisms, marble machines and history formed my inspiration for this model.

UPDATE: added "Base 2.stl" with a slightly longer track.

The model incorporates two antique mechanisms; a "Peaucellier–Lipkin" straight line mechanism (vintage 1864), and a "Whitworth" quick return mechanism (vintage 1800's) that, when combined as they are in this design, provide a straight line slow ascent, and a straight line rapid descent. In this model, these combined functions are use to slowly raise a bucket containing a marble (an 8mm ball bearing) to the top of a short, built in, track, dump the marble onto the track, rapidly lower the bucket to pick up the marble at the bottom of the track, and then repeat the process.

I've included a sketch illustrating the method I used to compute the bar lengths for the straight line mechanism. If you have any questions about the illustration leave a comment and I'll do my best to answer.

As usual, I probably forgot a file or two or who knows what else, so if you have any questions, please do not hesitate to ask as I do make mistakes in plenty.

Designed using Autodesk Fusion 360, sliced using Cura 3.3.1 and printed in PLA on both an Ultimaker 2+ Extended and an Ultimaker 3 Extended.

Step 1: Purchase, Print and Prepare the Parts.

Marblevator, Mechanisms requires a 300 rpm gear motor (33x12mm 300RPM Metal Mini DC 6V Gearbox Gearwheel Motor Mini Reduce Speed Geared Electric Motor), a 1.5 vdc power supply, and an 8mm (3/8") ball bearing.

I printed "Bucket.stl" with .1mm layer height and 100% infill. I printed the remaining parts at .15mm layer height with 15% infill. I printed two "Bolt, 4.2mm shoulder.stl", four "Bolt, 8.4mm shoulder.stl", four "Arm, DB.stl" and one each of the remaining parts.

Prior to starting assembly, test fit and trim, file, sand, etc. all parts as necessary for smooth movement of moving surfaces, and tight fit for non moving surfaces. Depending on the colors you chose and your printer settings, more or less trimming, filing and/or sanding may be required. Carefully file all edges that contacted the build plate to make absolutely sure that all build plate "ooze" is removed and that all edges are smooth. I used small jewelers files and plenty of patience to perform this step.

Marblevator, Mechanisms uses threaded assembly, thus a tap and die set ((M4 by 0.7, M6 by 1) may be required for thread cleaning.

Step 2: Assemble the Upper Arm (Arm CD).

Position the first "Arm, DB.stl" onto "Arm, CD.stl" as shown.

Position the second "Arm, DB.stl" onto the first as shown.

Secure the three arms together with the first "Bolt, 8.4mm shoulder.stl" as shown.

This is the upper arm assembly.

Step 3: Assemble the Lower Arm (Arm CE).

Position the third "Arm, DB.stl" onto "Arm, CE.stl" as shown.

Position the fourth "Arm, DB.stl" onto the third as shown.

Secure the three arms together with the second "Bolt, 8.4mm shoulder.stl".

This is the lower arm assembly.

Step 4: Assemble the Mechanisms.

Position the upper and lower arms together as shown, then position "Bucket.stl" into position as shown and secure the bucket and arms together using the third "Bolt, 8.4mm shoulder.stl"

Secure the remaining two arms together by positioning "Arm, Wheel.stl" as shown then secure the arms together using the fourth "Bolt, 8.4mm shoulder.stl as shown.

This is the mechanism assembly.

Step 5: Attach the Mechanism Assembly to the Base.

Position the mechanism assembly on "Base.stl" as shown.

Position "Wheel, Geared (64 teeth).stl" as shown.

Secure "Arm, Wheel Geared.stl" to the base with the first "Bolt, 4.2mm shoulder.stl".

Secure "Wheel, Geared (64 teeth).stl" using "Axle, Wheel Geared.stl". The axle will travel through the center hole in the geared wheel, through the free hole in the lower arm assembly, throughout the free hole in the upper arm assembly, then into the threads in the base.

Step 6: Attach the Mechanisms to Wheel, Geared (64 Teeth).stl.

Position "Arm, Wheel.stl" as shown then secure it to "Wheel, Geared (64 teeth).stl" using the second "Bolt, 4.2mm shoulder.stl".

At this point, "Wheel, Geared (64 teeth.stl)" should easily rotate and the mechanism should work smoothly. If any binding occurs, make sure the arms are positioned properly and the bolts are not over tightened.

Step 7: Attach the Gate.

Position "Gate.stl" onto the base assembly as shown, then secure it in place with "Axle, Gate.stl".

Step 8: Final Assembly.

Press "Gear, Spur (8 teeth).stl" onto the motor shaft as shown, then slide the assembly into the base until "Gear, Spur (8 teeth).stl" aligns with the teeth on "Wheel, Geared (64 teeth).stl"

Apply 1.5vdc to the motor such that "Wheel, Geared (64 teeth).stl" rotates counter-clockwise when viewed from the front.

That's how I printed and assembled "Marblevator, Mechanisms"!

Hope you enjoy it!

Make it Move Contest

Participated in the
Make it Move Contest

1 Person Made This Project!

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10 Discussions

0
seabirdhh
seabirdhh

Question 1 year ago on Introduction

Hello Greg, I am glad that you have constructed a marble machine again. I love this kind of machines and - and as you might remember - I have already printed some of your machines some time ago.
You write in the manual [UPDATE: added "Base 2.stl" with a slightly longer track.] But I can't find this file. I think a longer track makes sense, because the process of rolling down the track is very fast. I would like to print the base with the longer track. Could you please check that. Thank you!

0
gzumwalt
gzumwalt

Reply 1 year ago

Hi seabirdhh,

Sorry about that, I just put it up there. Best wishes!

Greg

0
seabirdhh
seabirdhh

Reply 1 year ago

Hello Greg, thank you very much for your answer!
BTW the picture to "Base 2" is not the base that belongs to "Marblevator, Mechanisms 2". But the file contains the correct object! Thank you!

0
DhanushD2
DhanushD2

1 year ago

Hello,
Love your works.
Could you upload the CAD files for the mechanism?
or you can email me at hemanth7764@gmail.com
Thank you.

0
JimK137
JimK137

Question 2 years ago on Introduction

Hi Greg, I have a 3d printer and use it a lot, but Im trying to design my own stuff to print using fusion 360. Do you have any 360 type tutorials that explain how to achieve the cool things that you have designed? I would like to follow along and design the marble machines with the tutorial.

Thanks Jim

0
gzumwalt
gzumwalt

Answer 2 years ago

Hi Jim,

I believe the only tutorial I created using Autodesk Fusion 360 was this: https://www.instructables.com/id/The-Design-of-Cy... and it's really not that good.

I'll see what I can do for a marble machine tutorial, maybe even this one.

Thanks for your question, and if you have any more, just ask and I'll do my best to answer it!

Greg

0
Donald Bell
Donald Bell

2 years ago

Love it! I just got a printer this weekend and I'm eager to print some of your designs Greg.

0
gzumwalt
gzumwalt

Reply 2 years ago

Thanks yet again Donald! I am very excited to see your results!

Except for the threaded components (you may require a tap and die set) this model assembles easy and runs great.

Greg

0
Gadisha
Gadisha

2 years ago

Nice, we love marble machines in this house :)

0
gzumwalt
gzumwalt

Reply 2 years ago

Thanks! It's a fairly simple print and assembly, and mine has run for a week without dropping a marble!

Greg