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 40 of 40
Like Tree21Likes

Thread: Maybe a annealing machine bones?

  1. #31
    Member Puffin's Avatar
    Join Date
    May 2012
    Location
    Porirua
    Posts
    430
    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
    3,077
    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.

  3. #33
    Member gadgetman's Avatar
    Join Date
    Jan 2012
    Location
    Christchurch
    Posts
    13,008
    Finally have the majority of components so will start building shortly.
    There are only three types of people in this world. Those that can count, and those that can't!

  4. #34
    Member
    Join Date
    Feb 2018
    Location
    New Plymouth
    Posts
    55
    I have all of the components except for smaller items like on off switches, tubing for the water-cooling and a relay that is strong enough to break 30V DC. I made things slightly more difficult for myself as I purchased a 12V dc timer instead of the 240v AC one, I wanted to run 240V in and everything run off 24V-48V So only having to worry about 240V once. Benefit of AC is it drops do 0V every cycle so the arc automatically gets suppressed every single. Im hoping a 24V automotive relay will work.

    I paid around 110 dollars for a 48v 20amp PSU from aliexpress. As the project mentions this type of PSU will not have quick enough up time to get the induction coil working so need it switch it first. I think all up ill be about $300 nzd including the power supply. A flame one would be cheaper but I like the idea of not having a flame inside the house and I wanted a project to do.

    Shooting and other bits and peaces has taken priority. Ill start building mine in the next few months once things are back to normal.

  5. #35
    Member
    Join Date
    Feb 2018
    Location
    New Plymouth
    Posts
    55
    Quote Originally Posted by gadgetman View Post
    Will likely use your typical auto cooling system liquid. Want to try just convection but have pumps just in case.
    From what I have read conduction is not enough to adequately cool it. Paid about 24 dollars for my pump and res combo.

  6. #36
    Member gadgetman's Avatar
    Join Date
    Jan 2012
    Location
    Christchurch
    Posts
    13,008
    Quote Originally Posted by Nugget connaisseur View Post
    I have all of the components except for smaller items like on off switches, tubing for the water-cooling and a relay that is strong enough to break 30V DC. I made things slightly more difficult for myself as I purchased a 12V dc timer instead of the 240v AC one, I wanted to run 240V in and everything run off 24V-48V So only having to worry about 240V once. Benefit of AC is it drops do 0V every cycle so the arc automatically gets suppressed every single. Im hoping a 24V automotive relay will work.

    I paid around 110 dollars for a 48v 20amp PSU from aliexpress. As the project mentions this type of PSU will not have quick enough up time to get the induction coil working so need it switch it first. I think all up ill be about $300 nzd including the power supply. A flame one would be cheaper but I like the idea of not having a flame inside the house and I wanted a project to do.

    Shooting and other bits and peaces has taken priority. Ill start building mine in the next few months once things are back to normal.
    I'm basing mine on an old PC with it's power supply and case. This will give me 12V and 5V supplies for the pump and control circuits and arduino. Will use an RC servo to operate the case release and a 60A solid state relay (got a box of them) to switch the output of the 48V supply. Possibly look at a case feeder too later on.
    There are only three types of people in this world. Those that can count, and those that can't!

  7. #37
    Member gadgetman's Avatar
    Join Date
    Jan 2012
    Location
    Christchurch
    Posts
    13,008
    Quote Originally Posted by Nugget connaisseur View Post
    From what I have read conduction is not enough to adequately cool it. Paid about 24 dollars for my pump and res combo.
    Yes, with the 3mm copper tube there is only a 2mm hole so it needs some help.
    There are only three types of people in this world. Those that can count, and those that can't!

  8. #38
    Member Willus's Avatar
    Join Date
    Jan 2014
    Location
    Middle of nowhere, Centre of Everywhere
    Posts
    359
    Quote Originally Posted by gadgetman View Post
    Yes, with the 3mm copper tube there is only a 2mm hole so it needs some help.
    Interested . Keep the updates coming. Ive got this on my list of things to do but have new arrivals so it has to wait.

  9. #39
    Not just an internet expert... The Claw's Avatar
    Join Date
    Dec 2011
    Location
    Gore
    Posts
    1,215
    Quote Originally Posted by gadgetman View Post
    Finally have the majority of components so will start building shortly.
    @gadgetman - any progress on this? Cheers
    If it's not a first round hit you need to practice more

  10. #40
    Member gadgetman's Avatar
    Join Date
    Jan 2012
    Location
    Christchurch
    Posts
    13,008
    Quote Originally Posted by The Claw View Post
    @gadgetman - any progress on this? Cheers
    Too much work on lately to have a crack at it. Hopefully over the next weekend or two.
    The Claw likes this.
    There are only three types of people in this world. Those that can count, and those that can't!

 

 

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!!