Industry Standard ? Marking End Bells/Disassembly

[Bogator]

I work at a local motor rewind/repair shop and me and my boss have a disagreement.
When disassembling a motor,my boss says that the Industry Standard states that the shaft end bell should be marked with two punch marks and the fan end of the end bell should be marked with one punch mark!

I say, one punch mark on the shaft end of the end bell then 2 punch marks on the fan end of the end bell.

Can anyone tell me the correct way as I have read it stated both ways here on the internet.....I say that my way is more logical to start on the shaft end with one punch mark and work through from there. Thanks,Bogator

 

[Skogsgurra]

As soon as you try to apply rules that are difficult to remember, you are in trouble. The whole punch mark idea is based on having identical marks on two parts that go together.

Punch end-bell on drive end with one mark (or two) and punch stator drive end with one mark (or two). Then punch the non-drive end-bell with two marks (or one) and the stator non-drive end with two punch marks (or one).

That way you never need to discuss that matter and the marking scheme can be used on motors with two shafts (two drive ends) as well.

 

[edison123]

In our shop, we punch DE on the coupling end of stator and end bell. NDE on the opposite end of stator and end bell.

Some use a single chisel mark across both the stator and the end bell on the shaft end and two chisel marks on the opposite end.

As skogs says, it does not matter what marks you use as long as the male and matching female parts are identified the same way.

 

[SteveKW]

I too have often wondered if there was a standard. The only reliable source of info on punching I could find was this...

http://www.easa.com/news/c0703.pdf

Page 3.

And as for punch marks solving all the problems, thats not always true, you can have identical end bells but not know which end the shaft came out!

I think I am going to make a poster declaring a standard of 2 marks for the SE.

 

[SteveKW]

When all else fails I go to Electric Motor Repair "Bible".
Second and third editions, first chapters, first paragraphs of "rewinding".

2 marks SE.
1 mark OSE.

I would argue that since every GOOD shop has a copy, that that would be the standard!