Site Logo

 
It is currently Sun Nov 23, 2014 7:19 am

All times are UTC - 6 hours




Post new topic Reply to topic  [ 6 posts ] 
Author Message
 Post subject: Round Knockout Punch
PostPosted: Tue Aug 23, 2011 8:22 am 
Offline
User avatar

Joined: Tue Jan 13, 2009 12:22 pm
Posts: 362
Does anyone have or have access to any round knockout punches used to put clean, round, burr-less holes in metal? Looking for them in regards to the brewing system build.

Thanks
-Dave Toews


Top
 Profile  
 
 Post subject: Re: Round Knockout Punch
PostPosted: Thu Aug 25, 2011 3:56 pm 
Offline
User avatar

Joined: Thu Dec 02, 2010 12:25 pm
Posts: 75
Location: Minneapolis
I have a .875" (1/2" electrical knockout).

I also have an electrician's step drill which does pretty good in sheet metal. It's about 3/8 to 7/8.

-Jim Hart


Top
 Profile  
 
 Post subject: Re: Round Knockout Punch
PostPosted: Fri Aug 26, 2011 8:33 am 
Offline
User avatar

Joined: Tue Jan 13, 2009 12:22 pm
Posts: 362
That might work. I would need to find the corresponding ball valve fittings, as most of the plans I've seen are for 13/16th (8.125") size.


Top
 Profile  
 
 Post subject: Re: Round Knockout Punch
PostPosted: Fri Aug 26, 2011 12:56 pm 
Offline
Global Moderator

Joined: Mon Jun 22, 2009 1:41 pm
Posts: 533
Location: Northwest Burbs
How thick is the metal? Harbor Freight had a couple of cheap punches for what they called light metal (I am guessing tin/aluminum) and starting with leather.

I bought a set, but they are cheap, so steel would be right out from what I can see.

The other option is to machine a punch to spec, and if it is something you think we could sell to other brewers, we could have our first Hack Factory product to sell.
(ok, back to reality) the whole punches I have seen are just tapered to spec, so even with our nicely refurbished metal lathe, we should be able to cut a stainless steel rod down and then hollow out a core.


Top
 Profile  
 
 Post subject: Re: Round Knockout Punch
PostPosted: Fri Aug 26, 2011 1:35 pm 
Offline
User avatar

Joined: Tue Jan 13, 2009 12:22 pm
Posts: 362
The metal is stainless steel keg walls. Not sure the HF punch would do the job.


Top
 Profile  
 
 Post subject: Re: Round Knockout Punch
PostPosted: Fri Aug 26, 2011 2:30 pm 
Offline
Global Moderator

Joined: Mon Jun 22, 2009 1:41 pm
Posts: 533
Location: Northwest Burbs
Ya, I would think it is a bit cheap to work.. And with out a way to block the back of the hole, a hand made one may not work either. :(


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 6 posts ] 

All times are UTC - 6 hours


Who is online

Users browsing this forum: No registered users and 0 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group
Template made by DEVPPL Flash Games