Go Down

Topic: Measuring a very fine wire with 10 µm precision (Read 5 times) previous topic - next topic

vasquo

Quote
I am interested in tightly spooling the wire on a coil former. The coil will then be used for another project and it has to be well packed. Instead of working form the theorical diameter of the wire when making the coil, I am interested in measuring it as it unwinds from it's original spool (more accurate).

So you're trying to wind inductors? Are these audio inductors?

I'm just thinking, who cares about the EXACT diameter of your wire (and whatever 0.01mm variations it has)... it's more important to get the correct inductance and DCR (within % tolerance) of your limited equipment? .... rather than worrying about it's diameter?

Maybe build an inductance meter using an Arduino (very possible, with high accuracy) and have your machine keep winding until the set inductance value is reached -- regardless of your wire diameter variations.

JimboZA

This is a nice diagram explaining the difference between accuracy and precision
Roy from ITCrowd: Have you tried turning it off an on again?
I'm on LinkedIn: http://www.linkedin.com/in/jimbrownza

Boots507


This is a nice diagram explaining the difference between accuracy and precision


Yes I understand. I would like to know if there is a technique that would maximize both accuracy and precision when dealing with a wire and target resolution of 0.001 mm.

Any thoughts?

johnwasser

If I wanted to wind a coil with maximum packing density (like for a Tesla coil secondary) I would just have the feed carriage lag a little behind so that the new wire is pressed lightly against the previous turn.
Send Bitcoin tips to: 1L3CTDoTgrXNA5WyF77uWqt4gUdye9mezN
Send Litecoin tips to : LVtpaq6JgJAZwvnVq3ftVeHafWkcpmuR1e

PeterH


Instead of working form the theorical diameter of the wire when making the coil, I am interested in measuring it as it unwinds from it's original spool (more accurate).


I'm skeptical that your measurement accuracy would be better than the manufacturing accuracy. Have you measured the actual thickness, and does it vary (between spools, or  within a spool) by enough to matter?

If your goal is just to wind wire onto a coil former then I would have thought you effort would be better spent designing the winding mechanism so that the wire stacked itself correctly. Doesn't a conventional winder sort this out for you? I'm surprised that it's necessary to do anything with any great precision when feeding the wire on, or that there are any benefits in knowing the wire thickness precisely.

If you really do need to know the wire thickness as an academic exercise then I'd use a micrometer. If it's necessary to measure this repeatedly at different places along the wire then I'd pass it between a pair of fixed/floating rollers and use a micrometer to measure the position of the floating roller. But this still feels as if you're solving the wrong problem.
I only provide help via the forum - please do not contact me for private consultancy.

Go Up