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  1. Bretina

    Custom mini push electromagnet & winding method

    Yes, I'm familiar with handedness. The standardized push solenoids I've found are either too big or too expensive. This is why I came up with the design for the push EM. I have been able to locate this:http://www.magnetechcorp.com/push-pull.html which again, is too expensive but they may be...
  2. Bretina

    Custom mini push electromagnet & winding method

    Thanks. Interesting. So you're saying at these low power levels it may not matter which method it's wound? The leads may need to be both on one end. Either method would allow that configuration as it's just a matter of when to stop winding, no? If not, then what you're suggesting is if method...
  3. Bretina

    Custom mini push electromagnet & winding method

    I have a small but urgent electromagnet project in process however the actuator I need doesn't seem to be readily available although although it's not anything new, except for the custom size I need. Attached is a reference sketch. I ordered and received these 12mm OD buzzers 12mm WST-1212S...
  4. Bretina

    Small EM recommended specs info.

    Thanks for the wire chart, very helpful. I'm back to current being about amps, not voltage, which is correct. It seems the goal is to maximize the amperage without overheating the coil wires. The EMs will be used as a "grabber" on underwater iron based mineral structures to "walk" the sub in...
  5. Bretina

    Small EM recommended specs info.

    Also, to give a better idea of size now, starting from the inside-out, the core might need to be between 1/16" to 1/18" diameter x 3/8" to 1/2" long. The maximum diameter would ideally be 1/4" max. So I need to get as many turns of wire around the core as possible. Also, if I keep the winding...
  6. Bretina

    Small EM recommended specs info.

    Thanks for the reply. Since EMs are pretty basic devices, once we know the parameters, it would be easier and less expensive to make them because they will be fitting into another custom shaped device. So I'm trying to get the fundamentals clarified before moving ahead. The power source will...
  7. Bretina

    Small EM recommended specs info.

    We need to create a remote controlled electromagnet for the pick-up arm of the submarine we're working on. EMs are pretty simple devices but I need some help to clarify a couple issues. The EMs in mind will be 1" or less in size and won't use more than 24Volts but 12Volts or less is more likely...
  8. Bretina

    Parameters for small electromagnet

    Those are excellent suggestions and questions. The transmotec sample should be a good starting point to test with. Thanks. I've been somewhat general because I know the device needs to be tested and I don't want to take more of your time than is necessary until I know specifically what's...
  9. Bretina

    Inorganic non-Newtonian fluids

    Well, it would return to it's original shape, defining it as a fluid but after a long time. It needs to have a much higher flow rate (not clay or putty-like) where it would return to it's relaxed state as in its original form immediately after impact pressure. I'll see what I can find under...
  10. Bretina

    Parameters for small electromagnet

    Thanks for the replies. It would be a solenoid with a moving armature. The "rod" in my question is the armature. It being a device with moving parts, I posted the question here. Is it more appropriate to be in the magnetic forum? Bretina FL, USA
  11. Bretina

    Parameters for small electromagnet

    I've been searching unsuccessfully for an electromagnet for my application and unless anyone can provide a source lead, I'll try to make one myself. I need some guidance for the parameters I need to say within so I don't waste time. It needs to be small, say no more than 1" long by 3/8" dia...
  12. Bretina

    Inorganic non-Newtonian fluids

    I think that won't work since it won't return to its original shape afterwards. Plus I don't think it will become rigid enough. Thanks for the suggestion. Bretina FL, USA
  13. Bretina

    Inorganic non-Newtonian fluids

    Hello, We're working on an application which we believe the behavior of a non-Newtonian fluid which becomes rigid when under stress. It needs to be inorganic so it won't spoil and as I understand it there are silicone polymers or oils which meet this criteria. Any other such fluid would be good...
  14. Bretina

    Determining specs for unmarked electric motors

    Thanks. They may be a good lead for needed components but the subs they seem to specialize in are very different from the direction we're going. Bretina FL, USA
  15. Bretina

    Determining specs for unmarked electric motors

    Thanks again. I'm going to look into the Turnigy 130A and see how it works. Although they will be drifting at times, preparing for continuous operation will take care of both scenarios. Following you advice, we'll need to add some kind of sealed heat exchanging system to it. I don't think that...
  16. Bretina

    Determining specs for unmarked electric motors

    I'm sure that won't be exact but close enough to know what specs to shop for later. What about the measure of load? Would attaching a torque wrench, starting with no resistance, then slowly tightening it until the motor smokes, give me the torque reading at that point - also less 30% of that...
  17. Bretina

    Determining specs for unmarked electric motors

    Good idea about the surplus suppliers. I'll definitely look into those. Being autonomous these will be let loose to signaling back data about conditions where they are. If it looks interesting, we'd signal it to collect a small sample. They won't be like the big, manned "Transformer" looking...
  18. Bretina

    Determining specs for unmarked electric motors

    Thanks very much! That sounds like a practical compromise to keep things moving forward. I can see you can appreciate that having a tight budget usually requires creative workaround solutions to at least get past the experimental working concept stage. Going to the high expense and time of...
  19. Bretina

    Determining specs for unmarked electric motors

    I see. Very wasteful to have so many motors get thrown away that way when they work just fine, even if for a while or for education. Like a used car and its parts for a hobbyist or for shop class at a vocational school. Many standardized ones could be rebuilt like car starters and alternators...
  20. Bretina

    Determining specs for unmarked electric motors

    Thanks for the reply. Yes, it will be battery powered and likely DC 12v. The source for the used motors says they test them to be sure they work and if they can be easily opened, they will to check for unusual signs of wear. The savings are 80-90% and available locally. I'm stunned this isn't...

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