I bought a big roll of it for another project about 5 years ago. i also made a DRO with about +/- 0.05mm accuracy with it and a couple TMR sensors. You can buy the real thing for fairly cheap with 1,2,5mm pole pitch
You can go further and use magnets instead of the rollers inside for even less friction and wear. Since you have that indicator film, you can use it for a better phase alignment if you cut the strips diagonally. I've been playing with the same idea in my head for weeks a few months ago, but using a beverage can never came to mind. An that is weird, because I hacked together a hundred things using that. I wonder how long can this hold up in use, under load.
I need to mount a bearing to the can to get useful output. Cans are great because they are die formed and cheap. the .1mm can wall is amazingly strong for what it is. I also have a tuna can sitting in my shelf begging for a try. Driving with a magnet wouldn't work. The field is only strong on one side and strong magnets tend to "wipe" the alternating field pattern. If you had a ton of money and time to burn you could use rare earth magnets and try to generate the wave with a magnet but it would almost certainly never be worth it from a cost perspective.
So a toothless strain wave gear? Does it have use able amount of torque (thinking 3d printing extruder) (heat might be the issue).. Cool tho, never thought of that.
they are "printed" more than extruded. there are videos showing the process of rolling magnet arrays over the material to magnetize the rubber + iron mixture. I also don't think it is actually a true Halbach array. The effect is similar more due to the weak magnetic strength of the material vs the poll arrangements.
Like a strain wave gear with magnetic teeth? Very cool :)
You've got some great designs. Where did you get the magnet strip from. The 3M strips runs along the length.
I bought a big roll of it for another project about 5 years ago. i also made a DRO with about +/- 0.05mm accuracy with it and a couple TMR sensors. You can buy the real thing for fairly cheap with 1,2,5mm pole pitch
You can go further and use magnets instead of the rollers inside for even less friction and wear.
Since you have that indicator film, you can use it for a better phase alignment if you cut the strips diagonally.
I've been playing with the same idea in my head for weeks a few months ago, but using a beverage can never came to mind. An that is weird, because I hacked together a hundred things using that.
I wonder how long can this hold up in use, under load.
I need to mount a bearing to the can to get useful output. Cans are great because they are die formed and cheap. the .1mm can wall is amazingly strong for what it is. I also have a tuna can sitting in my shelf begging for a try. Driving with a magnet wouldn't work. The field is only strong on one side and strong magnets tend to "wipe" the alternating field pattern. If you had a ton of money and time to burn you could use rare earth magnets and try to generate the wave with a magnet but it would almost certainly never be worth it from a cost perspective.
So a toothless strain wave gear? Does it have use able amount of torque (thinking 3d printing extruder) (heat might be the issue).. Cool tho, never thought of that.
it has magnetic teeth so it is not purely friction. You can use friction for a strain wave gear though... I will also be trying that out.
Fridge magnets are frequently extruded as halbach arrays to save material, should explain the racheting
they are "printed" more than extruded. there are videos showing the process of rolling magnet arrays over the material to magnetize the rubber + iron mixture. I also don't think it is actually a true Halbach array. The effect is similar more due to the weak magnetic strength of the material vs the poll arrangements.
@@JesseSchoch more like pole distance vs. thickness. I don't think magnetic strength plays a significant role.