Elektroda.com
Elektroda.com
X

Jewelery magnetic polisher - Handmade by CMS

CMS 119085 40
This content has been translated flag-pl » flag-en View the original version here.
  • #31
    CMS
    Administrator of HydePark
    Fixed electromagnets will not have this effect. However, it should also work to some extent.
    Note that at the maximum RPM - 3400rpm, the magnetic field changes 13,600 times per minute, at the moment the inverter is set to 42Hz which gives 2400rpm which is almost 10,000 anyway.
    I'm afraid the electromagnets could get hot. After all, each switching on and off causes a "current-voltage" surge, but I may be wrong.

    This solution would significantly reduce the size of the machine.
  • #32
    ArturAVS
    Moderator HP/Truck/Electric
    CMS wrote:
    After all, each switching on and off causes a "current-voltage" surge, but I may be wrong.

    Eddy currents in the cores ... will do their job :D Here, a rotating magnetic field is generated mechanically, and this has great advantages (e.g. simple speed control of the drive motor). Marcin and ask the recipient how would fine steel shot work instead of needles. It seems to me that the frictional resistance on the bolt would be lower than on the pins.
  • #33
    CMS
    Administrator of HydePark
    The shot will not penetrate the processed material, which by definition has many small details. Needles squeeze into the smallest nooks and crannies.
  • #34
    ArturAVS
    Moderator HP/Truck/Electric
    CMS wrote:
    Needles squeeze into the smallest nooks and crannies.

    Apparently so, but pellets of 0.2 mm? It's almost like sand, and sometimes I give small details for sandblasting. If the shot worked, maybe he would build such a machine (I do not make rings :D ).
  • #35
    CMS
    Administrator of HydePark
    I think that if pellets were better than needles, jewelers would use pellets :) .
    You see, the pellet only hits, and the needle hits the tip and at the same time rotates in some plane and as if it will make a scratch on a polished element. So we have not only stroke but also friction. The shot, on the other hand, "only" hits. The sand works well because it has sharp edges, except that it is much finer than the mentioned 0.2mm.
  • #36
    krzys1985
    Level 8  
    very nice machine, i have been looking for something like this for a long time to clean, can you tell what thickness did you use magnets? I can see that the plate is 20cm, what magnets to use with a diameter of at least 50cm or more?
  • #37
    CMS
    Administrator of HydePark
    Neodymium magnets 30mm diameter 5mm thick.
  • #38
    Anonymous
    Level 1  
  • #39
    Anonymous
    Level 1  
  • #40
    CMS
    Administrator of HydePark
    CMS wrote:
    robokop wrote:
    One more very important thing. The disc with magnets sticks to the motor axis on the screw - with a right-hand thread. When switching to "left", it will unscrew ...

    I thought about it. Between the disc and the pulley, there is a silicone washer of the pulley diameter. After 6 hours of testing, nothing has loosened. And as if you can always drip blue thread glue.

    A few days ago I spoke to the owner of my "work". The polisher has been working almost non-stop for a year now. Also, all your fears were, not to say unfounded, but strongly exaggerated.
  • #41
    CMS
    Administrator of HydePark
    The polisher has been working for 2.5 years and it's hard, because often at night alone, when employees are already at home and the workshop is closed for 4 triggers.
    So let me write that all your "fears" and reproaches about the construction were unfounded. A commutator motor with such a load of work would eat up the brushes twice, and maybe the commutator would "end" and then what? I would have an extra job with meager profit. And yes, as long as the bearings don't fail, which should not happen in the next few years with this engine setup, I'm fine.