Tapping threads without a T-handle

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sevy
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Tapping threads without a T-handle

Postby sevy » Sat Sep 26, 2020 7:02 pm

I had a broken bolt in one of the torque tube mounting holes in the transmission, and since I have it apart right now, I decided to fix the broken bolt issue. Unfortunately, using a series of left-handed drill bits and carefully drilling did not get it to break free, so I decided to overbore a new hole and tap it for a larger bolt.
The drilling went slow and steady with plenty of cutting oil, so as not to wreck the cast iron, and it turned out just fine.
The problem is that the shop where I have my Cub is 40 miles from my house, so I didn't have the T-handle for the tap on hand.
Time for some creative engineering!
After some eyeballing, I discovered the square tap was the same size as a 3/8 drive ratchet. I took a short bolt and threaded some 1/2" nuts tightly onto it, then used one socket backwards on the tap, and another on the ratchet, with the cluster of nuts connecting the two.
Worked great, even when doing each reverse turn to clear chips.
Here are some pictures:
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Peter Person
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Re: Tapping threads without a T-handle

Postby Peter Person » Sat Sep 26, 2020 7:18 pm

Very creative! Necessity is the mother of invention.
Also, a 7/16" 12-point socket will fit the 3/8" square. :idea:
1957 Farmall Cub "Emory", Fast-Hitch, L-F194 Plow & Colter, L-38 Disc Harrow, Cub-54A Blade, Cub-22 Sickle Bar Mower, IH 100 Blade

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sevy
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Re: Tapping threads without a T-handle

Postby sevy » Sat Sep 26, 2020 7:31 pm

Thanks! Great tip!
I have mostly 6 point, with an odd 12 point here or there, but that would have made this easier!

tst
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Re: Tapping threads without a T-handle

Postby tst » Sat Sep 26, 2020 8:39 pm

they make a set of "Tap Sockets" they are cheap also, no toolbox that owns tap and die set should not be without them

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tmays
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Re: Tapping threads without a T-handle

Postby tmays » Sat Sep 26, 2020 8:56 pm

I wouldn’t tap for larger bolt. I would helicoil back to original size. Of course, probably late advice. Lol
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tst
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Re: Tapping threads without a T-handle

Postby tst » Sat Sep 26, 2020 9:40 pm

here is a link for the tap sockets but can be found many places, they make another set for larger sizes
https://www.amazon.com/Lisle-70500-Tap- ... 8711&psc=1

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Dale Finch
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Re: Tapping threads without a T-handle

Postby Dale Finch » Sun Sep 27, 2020 8:56 am

Thanks, Tim!!! I needed to chase threads on a bunch of bolts on the '51 that's about done, including the hood & bolster. I usually try to find a regular socket (SAE or metrics to choose from), but this will surely simplify things! Just ordered that set from Home Depot with free delivery to my home. :D :coffee:
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Re: Tapping threads without a T-handle

Postby Waif » Sun Sep 27, 2020 10:13 am

A crescent wrench has worked a tap , more than once!
Your socket driver seemed quite up to the task.


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