Search found 10936 matches

by Mark
Sun Mar 03, 2024 7:14 pm
Forum: Off topic forum
Topic: youtube
Replies: 1508
Views: 533908

Re: youtube

"Oh, that's really weird ... Can you hear that?"

How NASA Reinvented the Wheel
https://www.youtube.com/watch?v=vSNtifE0Z2Q&t=900s
by Mark
Sun Mar 03, 2024 7:14 pm
Forum: Off topic forum
Topic: youtube
Replies: 1508
Views: 533908

Re: youtube

"Oh, that's really weird ... Can you hear that?"

How NASA Reinvented the Wheel
https://www.youtube.com/watch?v=vSNtifE0Z2Q&t=900s
by Mark
Thu Feb 29, 2024 1:44 pm
Forum: Ramjet forum
Topic: Ryan's Marquardt Firebrand drone
Replies: 1
Views: 65

Re: Ryan's Marquardt Firebrand drone

by Mark
Sun Feb 25, 2024 5:01 pm
Forum: Off topic forum
Topic: youtube
Replies: 1508
Views: 533908

Re: youtube

Quite a bit of spring energy as it jumps out of the beaker
Thick nitinol wire tossed in hot water, breaks glass beaker.
https://www.youtube.com/watch?v=MuhwiPzlcCw
by Mark
Sat Feb 24, 2024 3:58 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1850
Views: 807815

Re: Odds and ends

Some out of focus perspective showing the angle and movement of the rolling with a fixed point. The other day it ran for almost 9 minutes and could do better if it had a flat even surface for it to roll over.
Wheel Motor Pivoting on a Point
https://www.youtube.com/watch?v=9DG4FdhXGJw
by Mark
Fri Feb 23, 2024 3:45 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1850
Views: 807815

Re: Odds and ends

My little rolling wheel motor towel bar posts are made of chrome-plated brass. So I wonder how a nitinol wheel would perform. From Wikipedia "The discovery of the shape-memory effect in general dates back to 1932, when Swedish chemist Arne Ölander[6] first observed the property in gold–cadmium alloy...
by Mark
Thu Feb 22, 2024 7:59 pm
Forum: Off topic forum
Topic: youtube
Replies: 1508
Views: 533908

Re: youtube

Just a funny design Shape Memory Motor Prototype Test https://www.youtube.com/watch?v=JAbjJY-6Ts4&list=PLdlO2o-tWpQvdZPJMJ9E_7My_VDfgAy7W A faster one Very strong Nitinol Engine running on warm water and ice https://www.youtube.com/watch?v=sscoMtJV0uY&list=PLdlO2o-tWpQvdZPJMJ9E_7My_VDfgAy7W&index=3 ...
by Mark
Thu Feb 22, 2024 1:51 am
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1850
Views: 807815

Re: Odds and ends

Yes. I've bought several shapes myself because they just seemed like something potentially useful later on somehow. Here's yet another variation of the wheel motor. A center needle point stays fixed in one spot and the wheel tilts on the pivot point going in circles. I was thinking of trying a swash...
by Mark
Tue Feb 20, 2024 2:00 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1850
Views: 807815

Re: Odds and ends

I kind of like this twirling effect, like something you would spin on the tip of your finger with motion.
Compound Rocking Motion Using Two Cones
https://www.youtube.com/watch?v=Kk9-ocp1Nx4
by Mark
Sat Feb 17, 2024 8:35 pm
Forum: Off topic forum
Topic: Left field
Replies: 600
Views: 221201

Re: Left field

I saw this exact desk model for sale on ebay today for $1800.00. https://chadslattery.com/X-Plane-Models/113 https://www.bonhams.com/auction/29359/lot/152/globe-aircraft-model-22-goblin-contractors-concept-model-mixed-material-on-wood-base-late-1940s-wingspan-7-14-inches-fuselage-8-34-inches-7-14-in...
by Mark
Mon Feb 12, 2024 8:49 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1850
Views: 807815

Re: Odds and ends

I came across this video today by accident, it having some pertinent subject matter starting here. If you turn up the volume you can hear the brass ball chatter or vibrate a bit. PIEZOELEMENT THE SIMPLEST ELECTRICITY GENERATOR Piezoelectric Generator IGOR BELETSKY https://www.youtube.com/watch?v=Kwy...
by Mark
Mon Feb 12, 2024 12:53 am
Forum: Off topic forum
Topic: youtube
Replies: 1508
Views: 533908

Re: youtube

Interesting ending to the story
Why It Was Almost Impossible to Make the Blue LED
https://www.youtube.com/watch?v=AF8d72mA41M
by Mark
Sun Feb 11, 2024 6:31 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1850
Views: 807815

Re: Odds and ends

Some experiments but not much else. I guess it's a lot of weight to move unless perfected.

Test of a Two Inch Single Ball Bearing Motor
https://www.youtube.com/watch?v=Fxxp-VkKqsY
Large Ball Bearing Motion from Heat
https://www.youtube.com/watch?v=79Jl0g4Gz5Q
by Mark
Fri Feb 09, 2024 10:28 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1850
Views: 807815

Re: Odds and ends

The brass and aluminum spheres arrived today so I gave it a shot not knowing if they would work. Several metal trays didn't sustain so I thought the experiment was going nowhere but this pet bowl finally did. It's just strange how particular each metal is. So far my 30 mm 38 gram aluminum sphere has...
by Mark
Thu Feb 08, 2024 8:58 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1850
Views: 807815

Re: Odds and ends

Hey Mike, I bought this bag of tiny needle bearings and parts of some sort, a ring shaped bearing pictured sleeves over each end. Anyway shopping today from the Amazon overstock thrift store, the whole bag was 25 cents. One side of the center hole is wider, like for the head of a bolt instead of a p...