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Old 01-06-2012, 06:05 PM   #1
Huaco
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Default Knockout punch diameter

I see some guys using knockout punches (radio punches) to cut through their kettles and kegs... I am planning on using 1/2" fittings. What diameter punch would work best for this?
I have Knockout Punch Kit - Knockout Punches at Harbor Freight Tools this in mind...

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Old 01-06-2012, 10:33 PM   #2
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First off, what material are you punching through? If keggles, forget about the Harbor Freight set. What you want is a 1/2" conduit punch. I actually got mine at our local Home Depot in the electrical section where they have the volt meter and wire fishing tools. It was something like $23.
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Old 01-06-2012, 10:36 PM   #3
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most people use stepper bits with oil.

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Old 01-06-2012, 11:09 PM   #4
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I have used the harbor freight punch. I punched about 15 holes in 3 kegs and it still works. Just use oil on the cutter and on the threads of the punch. It got a little distorted on the edge of the cutter after about 3 punches but I used a file to file the edge sharp again and it kept on working. It's not the best punch but it does the job.

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Old 01-06-2012, 11:52 PM   #5
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Quote:
Originally Posted by JRems View Post
I have used the harbor freight punch. I punched about 15 holes in 3 kegs and it still works. Just use oil on the cutter and on the threads of the punch. It got a little distorted on the edge of the cutter after about 3 punches but I used a file to file the edge sharp again and it kept on working. It's not the best punch but it does the job.
I agree. It is a decent tool set for conduit sized knockout holes and at $25 it is a whole lot less expensive than a Greenlee set at over $200.

Huaco,
Please keep in mind that the punches are sized for conduit connectors and are not called out with their actual hole size. I suggest that you measure carefully.
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