8 replies to this topic

[AB75]

Google has been pretty useless for this, and I hate to resort to a new topic, but can someone explain the very basic ways to identify armature specs and who may have produced them? Im sorting through a box of armatures and would like to know what Im looking at.

Ive also seen a lot of posts on winding, testing resistance, etc., but nothing with the simplest of info. Such as. What do .600 or .510 stack lengths? I thought it was inches but converting from mm using my micrometer doesnt suggest that. And what are winds? All I see looking at the copper wire are jumbled stacks of wire. Or how do you know what the armature is if theres no tag? And what is an SC tag? All these kinds of questions, ones Ive spent hours trying to find with little luck. Thanks!!!

[Bill from NH]

Adam, post a photo here of some of your arms. That may help someone here identify what you have. Also measure their arm diameters & stack lengths. There isn't any one source that will tell you everything you're asking.

[AB75]

I had planned on posting photos with the original post, but what a pain. Photos from my phone were too large of format to post, so I had to email them to myself, adjust in photo editor, and then upload. Anyway, here are about half. I also believe I figured out SC is a Pro Slot Scorpion arm. Will get some measurements soon.

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[crazyphysicsteacher]

So, stack length should be the physical length of each arm from end to end along the shaft axis without any wire on it.

The first Pic shows lots of 16d arms.
The second looks to have a few fk arms on the left side with the scorpion arm in the middle.
And yeah, Google is useless for this stuff unless you go to the motor building section of slotblog. You will find all you need in there.

Sent from my Nokia XR20 using Tapatalk

[Bill Seitz]

Some additional info -

 

Stack length is over the stack of laminations (part the wire is wound around) and is in inches. It's not the overall length of the armature.

 

16D armatures should have stack length of .600", S16D .490", and the FK armatures vary slightly (seems like by +/- 1 lamination) but are generally around .4".

 

In the top photo at the bottom between the 16D arms is what appears to be either a Wasp/Super Wasp or 12/X12 armature. It ought to have a tag, although if it's a very early Mura arm they might not. If the stack length is closer to .4" than .350", it could also be a FK "12", "BD", or "PD" arm, but all should have tags.

 

16D and S16D armatures are most likely ProSlot as are the Scorpion (SC) armatures. There's a possibility that all the armatures are ProSlot.

 

It's difficult to determine the wind visually. Wind is the number of turns of a given wire gauge. Turns can't be determined except by destroying the arm, and wire gauge is typically also impossible to get a measuring tool on the wire to determine.

 

Any meaningful resistance or inductance measurements will require sensitive lab instruments, not something that can be done with a Digital Multimeter.

[Ramcatlarry]

"TAGGED" arms , such as 16D, S16D, SC, SP (sportsman) Wasp, and "Group" arms all have standard wind patterns.  Most un-labeled  american wind arms are engraved with the #turns and wire size.  Some of these are confusing to newbys like a "64" or "84" are shorthand for open wing car winds.

[Bill from NH]

At the bottom of your first photo, on the left (red dye) is a 16D "Fat Arm" with about a .560 diameter while the normal 16Ds vary between .512-.518. This arm might have less timing than the others too. This Fat Arm is probably made by RJR or Viper, who bought out RJR. The arm at the bottom right of this photo appears to be from a MPC Dyno-Can, a motor similar in size to a 36D.

[AB75]

Sorry to be resurrecting an old thread, but does anyone recognize the producer of this arm? I haven't been able to cross reference the small tag to any specific company.

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[Dominator]

Adam, I believe that is a ProSlot.