 what is the technique for a stripped thread in hardened material?, how to re-tap a pinion shaft threads / Tranny problems |
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| brant |
 Oct 22 2020, 09:21 AM
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914 Wizard  Group: Members Posts: 11,624 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains 
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Ok...
so I had a big transmission failure this box was built by a friend, at a clinic I'm guessing the 30mm Bolt (for the speedo drive) was not torqued correctly? apparently it came loose the stack slid and drove the brass angle drive through the back of the tail cone the little button in the picture is the plug from the magnesium tail cone but as you can see the bolt threads were heavily damaged I have a replacement bolt with good threads but the threads inside the pinion shaft received some damage also I have the correct tap but the material of the pinion shaft is so hard, that I can't get the tap to start What is the technique to thread something hardened? I'm betting the process involved heat, and softening the metal then rehardening... which may not be a good idea with a pinion shaft so I may need to build a different transmission but if I could tap this thread, I'd be willing to give this box a shot. any metal experts out there.. or machinist know if this is possible? thanks in advance brant Attached thumbnail(s)  
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| ChrisFoley |
Oct 23 2020, 07:52 AM
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I am Tangerine Racing Group: Members Posts: 7,925 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None
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Sometimes threaded holes aren't as hard as the surrounding metal, depending on the exact material and processing.
It may be worth attempting to run a cobalt tap into the hole before considering the shaft garbage. |
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| brant |
Oct 23 2020, 09:42 AM
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#3
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914 Wizard Group: Members Posts: 11,624 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains
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QUOTE(ChrisFoley @ Oct 23 2020, 07:52 AM)  Sometimes threaded holes aren't as hard as the surrounding metal, depending on the exact material and processing. It may be worth attempting to run a cobalt tap into the hole before considering the shaft garbage. I might call a few machine shops around here and see if one of them has the correct cobalt tap... very little to loose the price of the tap doesn't look like a good purchase for my 1x use |
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| Superhawk996 |
Oct 23 2020, 09:44 AM
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#4
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914 Guru Group: Members Posts: 5,826 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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QUOTE(brant @ Oct 23 2020, 11:42 AM) the price of the tap doesn't look like a good purchase for my 1x use Wouldn't hurt to try that to see if it will cut at all. Disregard. I didn't read your response properly. |
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Posts in this topic
brant what is the technique for a stripped thread in hardened material? Oct 22 2020, 09:21 AM
Superhawk996 You're probably not going to like the answer. ... Oct 22 2020, 10:38 AM
brant
You're probably not going to like the answer.... Oct 22 2020, 10:40 AM brant Ouch... the M12x1.50 carbides... start at 400 up
... Oct 22 2020, 10:59 AM Gint Is that on the one that grenaded? Not the one I h... Oct 22 2020, 03:12 PM brant Yes. The one that died
I’m hoping to be in the g... Oct 22 2020, 04:44 PM ChrisFoley MSC has this one for under $28
12x1.5 tap Oct 23 2020, 03:32 PM sixnotfour die grind first 2 thread out it's, fuched Oct 24 2020, 03:06 AM ChrisFoley One more point about working with hard metal, if y... Oct 24 2020, 07:06 AM brant Chris, Jeff, EVERYONE....
thank you again for al... Oct 26 2020, 03:28 PM Superhawk996
and then.... I WAS ABLE TO GET MY TAP STARTE... Oct 28 2020, 05:42 AM Gint :trophy: That's great!
I'm in no rus... Oct 27 2020, 09:09 PM |
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