Welcome guest, is this your first visit? Create Account now to join.
  • Login:

Welcome to the NZ Hunting and Shooting Forums.

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed.

NZGR Black Watch


User Tag List

+ Reply to Thread
Page 3 of 3 FirstFirst 123
Results 31 to 32 of 32
Like Tree20Likes

Thread: Maybe a annealing machine bones?

  1. #31
    Member Puffin's Avatar
    Join Date
    May 2012
    Location
    Porirua
    Posts
    371
    If air-wound coils don't do what is required then a gapped ferrite core will help and allow for a lower input power. Brass' good conductivity is a problem for inductive heating. The trick for this and uniformity is to have a coil that concentrates the flux on the shoulders. The neck is easier to heat as it has shorter current paths, a lower mass of material than the shoulders and walls, and heat can only conduct out of the neck in one direction. Necks will keep up temperature-wise with the shoulders with much less input. Then the field also needs to drop away rapidly in the other direction to minimize heating in the case walls so the heating down towards the head only gets there via conduction.
    Last edited by Puffin; 05-01-2018 at 06:29 PM.

  2. #32
    MIA somewhere in Nam 300CALMAN's Avatar
    Join Date
    Dec 2014
    Location
    Reluctantly JAFA
    Posts
    2,739
    Quote Originally Posted by Puffin View Post
    If air-wound coils don't do what is required then a gapped ferrite core will help and allow for a lower input power. Brass' good conductivity is a problem for inductive heating. The trick for this and uniformity is to have a coil that concentrates the flux on the shoulders. The neck is easier to heat as it has shorter current paths, a lower mass of material than the shoulders and walls, and heat can only conduct out of the neck in one direction. Necks will keep up temperature-wise with the shoulders with much less input. Then the field also needs to drop away rapidly in the other direction to minimize heating in the case walls so the heating down towards the head only gets there via conduction.
    Thanks @Puffin The magnet gap is also quite a nice reference point for the case head to assure repeated alignment.

 

 

Similar Threads

  1. FS: WTS Auto Annealing Machine
    By Duck Gunner in forum Buy, Sell or Swap
    Replies: 8
    Last Post: 12-07-2016, 10:52 AM
  2. Another annealing machine
    By chalkeye in forum Reloading and Ballistics
    Replies: 6
    Last Post: 23-05-2016, 06:45 PM
  3. DIY Automated Annealing Machine
    By kimjon in forum Projects and Home Builds
    Replies: 20
    Last Post: 23-03-2016, 07:49 AM
  4. Brisket Bones
    By Petros_mk in forum Hunting Dogs
    Replies: 5
    Last Post: 07-04-2014, 08:03 PM
  5. Annealing machine
    By R93 in forum Reloading and Ballistics
    Replies: 23
    Last Post: 14-12-2012, 07:50 PM

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
Welcome to NZ Hunting and Shooting Forums! We see you're new here, or arn't logged in. Create an account, and Login for full access including our FREE BUY and SELL section Register NOW!!