×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Alnico magnet

Alnico magnet

Alnico magnet

(OP)
Hi everybody.

I have a customer who used an old alnico magnets in pickup for guita. he told us the magnetic property is about Br:12.85KGs, Hc:767Oe, BH(max): 5.9MGOe, while he required the gauss value of cylinder magnet D5x17mm, with 1150Gs.

My question is :

1. Is this possible? Because according to our calculating, this magnetic property will result in 1500Gs.

2. Can we use regular alnico 5 (LNG40) as replacement because LNG40 will generate this 1150Gs.

3. for Pickup, whether the gauss value is the most important factor? if we can garantee teh gauss vlue, it will not influnce the performance of pickup whether we will use high Hc grade magnet or regular magnets.

Thanks in advance for your kind suggestion.
  
Replies continue below

Recommended for you

RE: Alnico magnet

I haven't checked your numbers but the magnet is very likely stabilized down from the 1500 Gauss value.  This is very common with Alnico.

Regarding your Q2: That's a decision between you and your customer

Regarding your Q3: You may find this link of interest:
thread340-105845: Alnico vs Ceramic in Guitar Pickups

RE: Alnico magnet

(OP)
Thank you for your information, which is helpful. MagMike.

RE: Alnico magnet

12.8 G and 750 Oe, sounds like good Alnico 5.  It might even be 5-7.  Has to be a cast grade, sintered can't reach these properties.

How old is it?  It might be an Fe Cr Co 5 material.  though I doubt it.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

RE: Alnico magnet

(OP)
Edstainless: you are correct, the original design is using very old magnets back to 1970's. And now we want to find some other grade alnico magnets but have same gauss value (1150Gs). And according to our calculation, there are several options of alnico magnets, but now we are not sure even these gauss value is the same as the original magnets, the performance of pickup will be the same?   

RE: Alnico magnet

If your replacement material is a bit weaker then you may have to stabilize to lower field level.  You need them all the same.  This would lower overall output, but I can't see you going down too much.
A good Alnico 5 should be able to get this.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login



News


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close