Search found 10938 matches

by Mark
Fri Feb 09, 2024 10:28 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1850
Views: 809938

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: 809938

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...
by Mark
Thu Feb 08, 2024 5:47 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1850
Views: 809938

Re: Odds and ends

Mike Everman wrote:
Wed Feb 07, 2024 1:38 am
Hmm, I have some hollow 1” bearing balls…
What sorts of things are the hollow bearing balls used for or what do you use them for? They sound like something nice to have for special projects.
by Mark
Wed Feb 07, 2024 8:09 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1850
Views: 809938

Re: Odds and ends

Last night I tried a glossy 3/8 inch drive 3/4 inch long reach 12 point chrome vanadium steel socket which rolled back and forth inside a tri clover piece of three inch diameter sanitary pipe for about 13 minutes or so before stopping. Just another odd thing tried, roller bearing style. ha https://w...
by Mark
Wed Feb 07, 2024 7:48 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1850
Views: 809938

Re: Odds and ends

I ordered a few solid aluminum and brass ball bearings to try but they haven't arrived yet. It's you pay your nickel and take your chances. It's been a lot of trial and error finding what metals work with another. There's thermal conductivity, heat capacity, thermal expansion, and things like surfac...
by Mark
Tue Feb 06, 2024 11:24 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1850
Views: 809938

Re: Odds and ends

On the Rotation of Hollow Spheres of Metal by Heat (Article from 1858) https://www.tandfonline.com/doi/abs/10.1080/14786445908642729 Rotation of Metallic Tubes and Spheres by Electricity https://www.tandfonline.com/doi/pdf/10.1080/14786445808642519 Ball Bearing Motor http://kirkmcd.princeton.edu/exa...
by Mark
Tue Feb 06, 2024 8:20 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1850
Views: 809938

Re: Odds and ends

Just another device
Bimetallmotor,Bimetal Engine
https://www.youtube.com/watch?v=D0R6lDalwlw
by Mark
Tue Feb 06, 2024 7:56 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1850
Views: 809938

Re: Odds and ends

I wonder if you could make a track composed of bimetal material and as a hot wheel motor rolled over it, the speed would be amplified instead of just an ordinary metal surface? Double Jumping Bimetallic Disc from Appliance Thermostat https://www.youtube.com/watch?v=_gWTheIHwbU Thermal Bimetal Window...
by Mark
Tue Feb 06, 2024 7:28 pm
Forum: Off topic forum
Topic: youtube
Replies: 1510
Views: 535474

Re: youtube

Maybe put a AA battery in a rocker, shorted with a high value resistor, so it heats until it dies? Or there are chem based hand warmers that might work. Sounds like it needs very little differential temp. Do you have an infrared thermometer to get a feel for the differential right before it stops w...
by Mark
Tue Feb 06, 2024 7:21 pm
Forum: Off topic forum
Topic: youtube
Replies: 1510
Views: 535474

Re: youtube

Maybe put a AA battery in a rocker, shorted with a high value resistor, so it heats until it dies? Or there are chem based hand warmers that might work. Sounds like it needs very little differential temp. Do you have an infrared thermometer to get a feel for the differential right before it stops w...
by Mark
Sat Feb 03, 2024 5:33 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1850
Views: 809938

Re: Odds and ends

Some fancy Trevelyan Rocker Apparel
https://collection-lhst.epfl.ch/?action ... ect&id=177
by Mark
Sat Feb 03, 2024 3:11 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1850
Views: 809938

Re: Odds and ends

Another thought comes to mind pertaining to the electrically driven ball bearing motor. It touches on this Trevelyan Rocker article, how the two have some things in common you might say. Imagine a rocking/clocking motor with a make and break electrical contact that repeatedly adds heat to the rocker...
by Mark
Fri Feb 02, 2024 1:05 am
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1850
Views: 809938

Re: Odds and ends

If I had some of these or metal bars instead of the wire commonly sold, it might be interesting to see what response they would have as or in a ball bearing motor.
https://www.dvidshub.net/image/856856/n ... ring-balls
by Mark
Wed Jan 31, 2024 2:31 am
Forum: Off topic forum
Topic: youtube
Replies: 1510
Views: 535474

Re: youtube

Love the clockish one, thanks! I bought a cheapy 10 dollar swinger from AliExpress to fiddle with. The little spars are too thin to hold heat but I could wire a fat bar or some methodology to it to make something swinging work with heat. Glad you liked the clockish. Energizing an Aluminum Rocking T...
by Mark
Tue Jan 30, 2024 11:04 pm
Forum: Off topic forum
Topic: youtube
Replies: 1510
Views: 535474

Re: youtube

Love the clockish one, thanks! I bought a cheapy 10 dollar swinger from AliExpress to fiddle with. The little spars are too thin to hold heat but I could wire a fat bar or some methodology to it to make something swinging work with heat. Glad you liked the clockish. Energizing an Aluminum Rocking T...