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 Post subject: Advice for working with steel chassis
PostPosted: Feb Sun 05, 2017 4:18 pm 
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Joined: Nov Sat 08, 2008 10:25 pm
Posts: 198
Location: Pasadena,MD
Greeting gang, I have an old dynamotor chassis I want to build a power supply on for an ARC 5 transmitter , I don't have to do too much cutting ,but there is a opening I need to enlarge about an inch or so to accommodate the wires for the power transformer . Any thoughts on proper tools ? I don't have any cutting wheels yet ,but that's the direction I'm going and or filing . :D Will chassis punches work on steel if it isn't too heavy gauge ?

Thank you


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 Post subject: Re: Advice for working with steel chassis
PostPosted: Feb Sun 05, 2017 4:32 pm 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: S. Dartmouth MA 02748-1225 USA
Quote:
Will chassis punches work on steel if it isn't too heavy gauge ?
Yes, unless claimed not for steel... 1/8" mild steel is about max, lubricate well both cutting surfaces and the threads.


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 Post subject: Re: Advice for working with steel chassis
PostPosted: Feb Thu 16, 2017 3:15 am 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Olympia WA USA
They make metal hole saws. That metal is likely too thick for a nibbler, IIRC. Sometimes a cone reamer will work well. They make some large ones for pipe up to 2" that I have seen.

Do NOT use a fly cutter with a hand drill. (:oops: ).
I have used an air die grinder also.
Often, your local full service welding or machine shop has a punch capability.
(Talk to them. You might be able to get it done for a 6 pk. left by their back door.) :wink:

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 Post subject: Re: Advice for working with steel chassis
PostPosted: Feb Thu 16, 2017 3:49 am 
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Might try a Dremel using the thicker cut-off wheel.

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 Post subject: Re: Advice for working with steel chassis
PostPosted: Feb Thu 16, 2017 3:58 pm 
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Joined: Sep Mon 10, 2012 10:41 pm
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Location: Phoenix, AZ
step drill

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 Post subject: Re: Advice for working with steel chassis
PostPosted: Feb Thu 16, 2017 4:03 pm 
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Flinx wrote:
step drill
Yep! Those do a good job, use plenty of lube too. Some step bits are in metric others fraction. They can grab the work so use clamps.


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 Post subject: Re: Advice for working with steel chassis
PostPosted: Mar Fri 10, 2017 4:42 am 
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Joined: Mar Sat 28, 2009 8:27 pm
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Location: Georgia
+1 on the Greenlee chassis punches and the old time pipe reamer. I have an old vintage pipe reamer that will ream a hole from 1/4" up to 4 inches.


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 Post subject: Re: Advice for working with steel chassis
PostPosted: Mar Fri 10, 2017 7:38 pm 
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Allow for extra room to add a grommet to protect the wires.

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 Post subject: Re: Advice for working with steel chassis
PostPosted: Sep Wed 20, 2017 12:48 pm 
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Chas wrote:
Flinx wrote:
step drill
Yep! Those do a good job, use plenty of lube too. Some step bits are in metric others fraction. They can grab the work so use clamps.

And work gloves! Ask me how I know to do this...

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