By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by Allendale Jan 24th

What annealing temperature?

All Topics | Latest Posts

Search for:  in Thread Title in  
Andrew Tinsley05/07/2020 16:08:26
1417 forum posts

I have a pair of ratchet crimping tools for crimping car battery leads amongst other things. (so they are hefty!)

The ratchet pawl has snapped across the hole that it rotates about. As usual, no manufacturers spares are available. The pawl is almost certainly made from 1/8" gauge plate and then hardened.. The break is a clean fracture, so the gauge plate has been hardened with perhaps little or no tempering "let down".

I can easily make another pawl or two and I have a small furnace to harden and if necessary, temper the end product Any suggestions for a tempering temperature.? Or should I just harden them without any further heat treatment? The way the pawl has snapped seems to suggest a very hard and brittle condition.



elanman05/07/2020 21:30:42
36 forum posts
3 photos

Well I would temper to Mid to dark straw. Sorry I'm old school I don't know what temperature that is. Others may have different ideas.



Clive Hartland05/07/2020 22:36:42
2671 forum posts
40 photos

As it is a pawl only the end needs hardening and tempering. heat and harde, dress off clean and then place on a hot steel block and let the colours run and as soon as dark straw reaches the tip dunk in cold water

All Topics | Latest Posts

Please login to post a reply.

Magazine Locator

Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!

Find Model Engineer & Model Engineers' Workshop

Support Our Partners
Eccentric July 5 2018
JD Metals
Eccentric Engineering
Subscription Offer

Latest "For Sale" Ads
Latest "Wanted" Ads
Get In Touch!

Do you want to contact the Model Engineer and Model Engineers' Workshop team?

You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.

Click THIS LINK for full contact details.

For subscription issues please see THIS LINK.

Digital Back Issues

Social Media online

'Like' us on Facebook
Follow us on Facebook

Follow us on Twitter
 Twitter Logo

Pin us on Pinterest