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 Post subject: Chassis work source?
PostPosted: Nov Sat 11, 2017 4:37 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1388
Location: Cambridge MN USA
Have an amplifier project I've been meaning to build for years, but doing the chassis work has been the biggest hold up. I've got all the punches for the tube sockets but need someone to do the almost 3" holes for the output transformers (CVP1s). Anyone know of somewhere I can get this done? I'd mark the centers for the holes before sending it out.

Thanks,

Scott


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 Post subject: Re: Chassis work source?
PostPosted: Nov Sat 11, 2017 5:21 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 3038
Location: Massachusetts
You could buy a carbide hole saw to cut those holes

https://drillsandcutters.com/3-carbide- ... gKV_fD_BwE


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 Post subject: Re: Chassis work source?
PostPosted: Nov Tue 14, 2017 2:54 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1388
Location: Cambridge MN USA
Wonder if it makes a cleaner hole than a conventional type? Rather expensive little bugger.

Scott


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 Post subject: Re: Chassis work source?
PostPosted: Nov Tue 14, 2017 3:00 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 11539
Location: S. Dartmouth MA 02748-1225 USA
A good hole saw would work, cleanup the hole with a machinists edge breaker.


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 Post subject: Re: Chassis work source?
PostPosted: Nov Fri 17, 2017 6:06 am 
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Joined: Dec Mon 29, 2014 9:39 pm
Posts: 3427
Location: Los Angeles
N0BST wrote:
Have an amplifier project I've been meaning to build for years, but doing the chassis work has been the biggest hold up. I've got all the punches for the tube sockets but need someone to do the almost 3" holes for the output transformers (CVP1s). Anyone know of somewhere I can get this done? I'd mark the centers for the holes before sending it out.

Thanks,

Scott



Sure, I use a hole saw for all round holes. The large ones are 3". Pilot with a 1/4 inch drill. Then put the proper size hole saw on the chassis. Tilt the saw just a little to cut better. Hang on for dear life.
Attachment:
300b trans.jpg
300b trans.jpg [ 85.04 KiB | Viewed 307 times ]

_________________
John Smith, over and out.
If I did something right, I made a mistake.


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 Post subject: Re: Chassis work source?
PostPosted: Dec Sun 10, 2017 5:45 am 
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Joined: Sep Wed 22, 2010 1:36 am
Posts: 429
Location: sunnyvale Ca.
For large hole like that I have made a layout and gang drilled them. Then some work with a Dremel tool to clean them up. You can see how they turned out in this thread.
http://www.antiqueradios.com/forums/viewtopic.php?f=8&t=205467
Part way down page two you can see the rough holes. Then further down is a pic of how they came out.
Mel W.


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