Hello
im curious about magnetic dampeners for a while since many swear by them (specially for turntables as it seems) but they are usually kind of expensive except some aliexpress knockoffs
So i would like to test my proof of concept the following weeks:
the big question is if this idea works out 🙂
im curious about magnetic dampeners for a while since many swear by them (specially for turntables as it seems) but they are usually kind of expensive except some aliexpress knockoffs
So i would like to test my proof of concept the following weeks:
- the top cap sits on the top 2 magnets with a small lid and possibly glued into place
- the 4 rings are these 21mm hole magnets : https://www.mtsmagnete.de/neodym-ri...agnet-27x3-mm-mit-21-mm-bohrung-neodym/a-5996
- the middle rod is a delrin hollow tube, 20mm outer and 10mm inner diameter
- trough the endstop (orange cap) and blue base will be a M4 screw inserted holding everything in place
- i will need to make some prototypes but in the end i would like this to be tweakable by removing/adding magnets, so it can actively be tuned to your device weight
- wanted to start with a smaller prototype, one magnet can hold 3,5kg, so my guess would be this is good for 3-12kg or so per feet but i will test this later
- after some testing 3d printed stuff is actually quite heavy duty if you use medium to large amount of infill, not much concerned about this, also the sound of two 3d printed pieces (currently PLA+) hit together doesnt sound as awful as expected, so im fairly optimistic here
- price wise i would expect 15-30 euro per feet in the end
the big question is if this idea works out 🙂
just for reference... this post kind of started it: https://www.head-fi.org/threads/diy-ground-box-thread.968372/post-18570203
Also in the 3d printing community there is a somewhat heavy need for vibration dampening (fast acceleration and stops of steppermotors/gentrys), there were some attempts from what i see on magnetic dampeners but nothing i would consider "audiophile" yet lol
optimally from what i gathered in terms of 3d printers i think 4 of these magnetic dampeners plus a 10kg cinder block (or heavy wood piece) on top for a flat surface could do wonders but i will test this further once all part arrived, i already did the 3d printed pieces a go and they look good
Also in the 3d printing community there is a somewhat heavy need for vibration dampening (fast acceleration and stops of steppermotors/gentrys), there were some attempts from what i see on magnetic dampeners but nothing i would consider "audiophile" yet lol
optimally from what i gathered in terms of 3d printers i think 4 of these magnetic dampeners plus a 10kg cinder block (or heavy wood piece) on top for a flat surface could do wonders but i will test this further once all part arrived, i already did the 3d printed pieces a go and they look good
just bought all parts and did a third revision, will probably post the first tests next week:
- adjusted the stopper/endstop (darkblue) to this 45 degree design, the same 45 degree angel is reversed in the topcap above the 2 ring magnets, this should hopefully center things when not loaded, if loaded things really dont matter too much if there is enough tolerances for no contact point beside between the delrin rod (grey) and the 2 magnets (orange) the top cap sits on
- the topcap (light green) is quite closed now on the bottom, so a hole on the top is now needed to insert the endstop
- changed overall dimensions and played around with chamfers to make it overall look nicer
- added a optional top cap which can hold on of these: https://frankenschaum.de/PolySound-Sylo-High-End-Lautsprecher-Fuesse-Schwingungsdaempfer-8er-Set for hopefully some more side to side vibration control
- adjusted the stopper/endstop (darkblue) to this 45 degree design, the same 45 degree angel is reversed in the topcap above the 2 ring magnets, this should hopefully center things when not loaded, if loaded things really dont matter too much if there is enough tolerances for no contact point beside between the delrin rod (grey) and the 2 magnets (orange) the top cap sits on
- the topcap (light green) is quite closed now on the bottom, so a hole on the top is now needed to insert the endstop
- changed overall dimensions and played around with chamfers to make it overall look nicer
- added a optional top cap which can hold on of these: https://frankenschaum.de/PolySound-Sylo-High-End-Lautsprecher-Fuesse-Schwingungsdaempfer-8er-Set for hopefully some more side to side vibration control
100 hits and no opinions? 🙂
So everything arrived and unfortunaly the tolerances on the delrin rod are too lose, it is 21mm (advertised as 20mm) outer diameter so the 21mm inner diameter magnet (barely) dont fit
i filed one piece 3.5cm long 20/10mm delrin rod down to build the first prototype (to get some more insight before buying more)
i can post pics later
i was thinking a bit how things can be magnetically aligned on the X and Y axis to reduce friction... and i think i have come up with an design, thanks to experimenting with the ring magnets and this video:
im not 100% sure yet, but i think if the rod in the middle of these feet in the video can be magnetically attracted than the rod would kind of center inside the ring magnet, i could do similar with placing small neodym ring magnets inside the delrin rod
in practice i think the top cap/magnets would still "lean" on the delrin rod at some point but i could imagine placing magnets (or something like iron (thick magnetic screw?)) inside the delrin rod could reduce friction here, have to try i guess
also i saw these: https://de.aliexpress.com/item/4001204536022.html (around the same force as the neodyms but much larger) which could work with the current unmodified delrin rods and maybe the larger area has some benefits in stabilizing the cap
also saw you can not only buy delrin rods but also telfon/ptfe ones.... might be worth a try 🙂
So everything arrived and unfortunaly the tolerances on the delrin rod are too lose, it is 21mm (advertised as 20mm) outer diameter so the 21mm inner diameter magnet (barely) dont fit
i filed one piece 3.5cm long 20/10mm delrin rod down to build the first prototype (to get some more insight before buying more)
i can post pics later
- you dont wanna allow too much travel (or too light devices) as the magnets literally act like a spring (even more so with more distance as it seems, "loading" the thing actually stabalizes it/this spring behaviour and it feels more like its actually dampening)
- the configuration in the pic (and two magnets aligned in the cap) actually allow for 3-5kg per feet
- it seems like multiple magnets stacked with opposing side dont increase weight capability that much, you cant multiple the weight here, multiple magnets on each end with poles aligned work better for this, but it allows for more travel i guess which is not really needed
- the endstop design works really well (and if i account for delrin tolerances in the next revision i also dont need to file here...)
- with these magnets the delrin rod barely needs to be 2-3cm long for an effective 3-5kg design
- as kind of exptected, if you tilt the top cap friction on the delrin rod increases, tho if things are 90 degrees aligned its really barely any friction beside the force from the magnet itself, so the design works fairly well and with an additional weight on top devices or additional feet and/or placement, things can be tuned to be aligned fairly well i think, i imagine this is a problem with all magnetic feets
i was thinking a bit how things can be magnetically aligned on the X and Y axis to reduce friction... and i think i have come up with an design, thanks to experimenting with the ring magnets and this video:
im not 100% sure yet, but i think if the rod in the middle of these feet in the video can be magnetically attracted than the rod would kind of center inside the ring magnet, i could do similar with placing small neodym ring magnets inside the delrin rod
in practice i think the top cap/magnets would still "lean" on the delrin rod at some point but i could imagine placing magnets (or something like iron (thick magnetic screw?)) inside the delrin rod could reduce friction here, have to try i guess
also i saw these: https://de.aliexpress.com/item/4001204536022.html (around the same force as the neodyms but much larger) which could work with the current unmodified delrin rods and maybe the larger area has some benefits in stabilizing the cap
also saw you can not only buy delrin rods but also telfon/ptfe ones.... might be worth a try 🙂
really cool how far 3d printer have come, just got it recently and its basicly my first project
bummer that there is no conducting filament for some nice cases beside some antistatic filament
i just did a little experiment with a ringmagnet and a "string" of 5mm cubemagnets ..... placed inside the ringmagnet will indeed center (kind of, unless you go to far off to one side) things AND you get this movement reducing phenomena you see if you let a magnet fall down a iron tube which leads to reduced fall speed, i imagine this will additionally damp resonances? .... DEFINITELY worth a try 🙂
just did another version (with the ferrite magnets, 7.5cm high, 6cm wide), same principle just another endstop design which one you like more?
tho, i just discovered a major flaw, the topfoot/cap cant be inserted unless i design a detachable bottom, not impossible but a bit more hassle..
another ferrite version, imo the best looking one so far (around 7x8.5cm on the pic)
inside the cap are again 2 magnets (A. to increase magnetic field, B. i could imagine having the same strength magnetic field on both sides could help "resonances" build up, using to different ones might counteract this and C. reduce tilt-ability cause of higher support)
also planned is a row of 8x3cm with 3 cm hole magnets inside the PTFE/Delrin rod, i hope tolerances allow for a M3 Screw