MEMBER ITEMS FOR SALE
Custom Knives | Other Knives | General Items
-------------------------------------------
New Posts | New PhotosAll Photos



Go Back   The Knife Network Forums : Knife Making Discussions > Custom Knife Discussion Boards > Knife Making Discussions > The Newbies Arena

The Newbies Arena Are you new to knife making? Here is all the help you will need.

Reply
 
Thread Tools Display Modes
  #16  
Old 01-06-2013, 04:53 AM
Crex's Avatar
Crex Crex is offline
Moderator
 
Join Date: Sep 2002
Location: Acworth, GA and/or Hanging Dog, NC
Posts: 3,583
Not sure you can get the "pipe" oven hot enough in a small forge wihtout burying it in the coals as you will continually lose heat on the top side. An end cap on one end will make it more efficient, but it still needs to be covered to maintain consistent heat.
Agree with Ray on the laser, working right at the top (or bottom) end range of an instrument is always iffy and not certifiable in industry. The T couple is a much more accurate route, however with an open coal forge, the effect of the surrounding heat outside the pipe will adversly effect the readings unless you can devise a way to attach that avoids this heat (which in turn indicates you will have a cold spot differential at one part of the chamber). Having worked on the instrumentation of industrial incenerators and heat exchangers as well as many other types of industrial equipment, I can tell you that the T-couples are much more accurate, but come with their own set of vunerabilities. You have to protect the lead wires and instrument from the heats. Industry standards require iconel stilling wells or sleeves to protect the end and leads of the T-couples. On a small muffle furnace...Paragon type HT oven, only the tip portion is exposed to the interior of the furnace heat chamber.
As you can see by the time you get all this divised to work consistantly right in a small open coal forge....you are pretty much hunting field mice with a .577 Snyder. Not to mention the bulk and set up each time you build up your heat nest. A quick check with the T-couple of your chamber to check it's interior heat (when all of it's the same color) will give you reasonably accurate results. Once you get it stable in the range you want, let your blade reach that same color (all but disappears) with no shadows or bright spots and you are ready for quenching.....provided your quench is up to the correct temp as well. Get it all correct at the same time or you are just shooting craps with your HT.


__________________
Carl Rechsteiner, Bladesmith
Georgia Custom Knifemakers Guild, Charter Member
Knifemakers Guild, voting member
Registered Master Artist - GA Council for the Arts
C Rex Custom Knives

Blade Show Table 6-H
Reply With Quote
  #17  
Old 01-06-2013, 09:42 AM
Ray Rogers's Avatar
Ray Rogers Ray Rogers is offline
Founding Member / Moderator
 
Join Date: Jun 2002
Location: Wauconda, WA
Posts: 9,840
You can't really leave the thermocouple inside the forge for extended periods without burning it up. It takes a while but eventually those moving hot gasses will cut up just about anything. You can put the thermocouple inside long enough to get a reading though.

I tried making stainless tubes and castable tubes to protect the thermocouple and they worked for quite a while but eventually they burned up or eroded away. It now seems more practical to insert the probe when you want to know the temperature. Even so, you will know the temperature more precisely at any given moment but you still won't be able to hold a precise temperature indefinitely ....


__________________

Your question may already have been answered - try the Search button first!






Reply With Quote
Reply

Tags
blade, brass, cold, design, easy, edge, files, fire, forge, hand, heat treat, hobby, hot, hunting, iron, knife, make, material, repair, rod, steel, what kind, wood


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Mini-Forge Question JLaw Heat Treating and Metallurgy 6 04-19-2012 09:19 PM
New forge idea: Mini-keg? TikTock Heat Treating and Metallurgy 1 09-01-2005 03:55 PM
New mini forge up and running AKmik Tool Time 35 05-14-2004 07:50 AM
anyone tried this mini forge? or have a better idea? AKmik Tool Time 10 03-19-2004 09:55 AM
My new mini shop forge millironknives Tool Time 1 01-05-2004 12:05 AM


All times are GMT -5. The time now is 08:28 PM.




KNIFENETWORK.COM
Copyright © 2000
? CKK Industries, Inc. ? All Rights Reserved
Powered by ...

Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
The Knife Network : All Rights Reserved