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Tool Talk Discussion Forum

drill bit hardness/temper

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larry in tn

01-11-2004 05:29:45

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I have some old "shipwrights" augers/drill's that my dad used years ago. I've used the things for many years myself. They have developed a tendency to dull very fast. I think this is because sharpening has over a period of years softened the metal or ground off the tempered part of the bit.
What would be a good at home method to harden the bits???
larry

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RusselAZ

01-11-2004 09:38:59

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Re: drill bit hardness/temper in reply to larry in tn, 01-11-2004 05:29:45

fun to play with but it's probably time to get new ones. And get good ones so your grandkids can use them 50 years from now

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kraigWY

01-11-2004 07:09:47

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Re: drill bit hardness/temper in reply to larry in tn, 01-11-2004 05:29:45

I can't find my book on how hard they should be, but if you find out, here is a was to Harden them'

You need a magnet. Heat the item to be hardened until it reaches its critical temp. The point where its no longer magnetic. Quinch it in oil. Now you need to draw the tember out to make it the right hardness. You have to heat it a certain temp. for a lenght of time. say 20 min. at 450 degrees. (this would depend on the hardness of the final product, need to find a chart for this). It its a low temp like 450 or so you can use the kitchen oven. If its a higher temp, you can use a lead pot (like for casting bullets) should have a lead themomitor.
This is relative easy if I didn't make it sound too confusing. I just have to find my chart for the hardness of differant tool, drill bits, taps and such. I've made a lot of taps and heating them this way and never had a problem.

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01-11-2004 07:15:46

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Re: Re: drill bit hardness/temper in reply to kraigWY, 01-11-2004 07:09:47

I thought I should add. Differant metal have differant critial temp. depending on the carbon content. But all become non-magnetic when they reach the critical temp. Thats why you need the magnetic.

KraigWY

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