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  #1  
Old 03-19-2020, 02:55 PM
Mitch757 Mitch757 is offline
 
Join Date: Aug 2005
Location: Falmouth, MA
Posts: 365
Default Cutting 2"hole in stainless firewall

What's the best method to cut the 2 inch hole in the firewall for the heater box.
I have the 2 1/4 inch knockout punch but that leaves little edge distance.

Suggestions?

Thanks,

Mitch
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  #2  
Old 03-19-2020, 03:28 PM
rapid_ascent rapid_ascent is offline
 
Join Date: Mar 2008
Location: Dublin, CA
Posts: 1,379
Default

See if you can find a 2" punch.
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  #3  
Old 03-19-2020, 03:47 PM
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JoopSJ JoopSJ is offline
 
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Location: The Netherlands
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Default

I don't think it has to be a perfect circle.
I just used a Dremel tool and it went pretty easy.
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  #4  
Old 03-19-2020, 03:51 PM
alpinelakespilot2000 alpinelakespilot2000 is offline
 
Join Date: Jan 2005
Posts: 3,680
Default

Quote:
Originally Posted by Mitch757 View Post
What's the best method to cut the 2 inch hole in the firewall for the heater box.
I have the 2 1/4 inch knockout punch but that leaves little edge distance.

Suggestions?

Thanks,

Mitch
If you search the threads you'll see a number of suggestions. I used a 2" bimetal hole saw that worked just fine.
Good luck.
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  #5  
Old 03-19-2020, 03:53 PM
cajunwings cajunwings is offline
 
Join Date: Jun 2007
Location: new iberia la
Posts: 813
Default 2? hole

I cut mine with a 2? hole saw in a drill. Had a helper back it up with a wood block. Used a dremel with a sanding drum to smooth up the cut edge.

Don Broussard
RV9 Rebuild in Progress
57 Pacer
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  #6  
Old 03-19-2020, 04:23 PM
PhatRV PhatRV is offline
 
Join Date: Mar 2018
Location: Buena Park, California
Posts: 378
Default

https://www.homedepot.com/p/Milwauke...9624/202327750

I use this if you already has a compatible arbor. I've collected a few different sizes from my build so far.
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