Pick & Place Nozzle Demagnetization
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- Опубліковано 7 вер 2024
- My DDM Novastar LE40-V pick & place machine nozzles are made from a ferromagnetic material which causes them to easily magnetize.
I show my workaround to getting these very expensive nozzles demagnetized.
The nozzles are held onto the spindle magnetically, which allows them to be easily swapped while running a board, so they do have to be made of magnetic material. This means they can have an issue with becoming magnetically attracted to small components, with some manufacturers being more of an issue than others. Normally, the viscosity of the solder paste would be enough to overcome the issue, but not always. Using the demagnetizer tool is a good option. I wouldn't actually suggest heating the nozzle though because the nozzles are annealed before annodizing and heating it would cancel that. This would decrease the life of the nozzle as a whole.
AC degausser is the way to go here. way faster and less damaging to the steel.
Thank you I appreciate the suggestion, will look into it next time!
Thank you all for the suggestions, I will certainly look into AC degaussing next time I run into this problem.
Thanks for the comment and suggestions. There are obviously better methods. In the heat and frustration of the moment, I googled around and heating was the only feasible quick way to demagnetize the tool and finish the job I had waiting. I learned about other methods from folks who commented on the blog and here.
Indeed nozzles are held in the spindle by a light magnet. DDM Novastar claims they are made of non magnetic material. IMO they should NOT be magnetic at all, and they should be held in with a locking mechanism, OR the nozzle TOP should have a welded/glued washer that is magnetic, not the whole tool. Magnetizing and picking up ANY components unintentionally is unacceptable even at a 0.1% rate. They should do whatever high end machines do, especially on the nozzle which is so important.
The tip of the flame is the hottest.
Also u should be able to demagentis with a big coil with an ac current. Place in the middle ond slowly pull it away.
How about the hysteresis method (it is fully electrical just electromagnet, AC and potentiometer / AC current source)? It was used to demagnetise CRT monitors.
yes, try this also, have air coil on mains (or on transformer) (one that will have enough resistance not to burn with power on it), then you insert metal into field and slowly take it out of the field. You do want strong mag. field, too weak might not work. I find this most useful, when you can't heat the object, if it has some plastic on it or so
Thank you I appreciate the suggestion, will look into it next time!