[modeleng] Re: steel boilers & Cu flues

Tim, et al,

I ream all of my 1/4" thick steel tube plates with a reamer that is .003" to 
.005" oversize so the copper tubes slide in with no scarring.  The hole must 
be as smooth as possible, hence the reaming operation.  Yes, they make 
reamers in oversizes so that is no problem.

Jesse the machinist in summat cooler W. Tennessee






----- Original Message ----- 
From: "Tim Kirby" <trk@xxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Monday, September 17, 2007 4:59 PM
Subject: [modeleng] Re: steel boilers & Cu flues


> On 9/17/07 4:43 PM, "Harry Wade" <hww@xxxxxxxx> wrote:
>
>> However as with so may other things, the quality of the first 
>> installation
>> job has a lot to do with how well the joint seal holds up.
>
> Cheerfully chiming in never having actually had to do it - :)
>
> I would assume that this would be a case where the finish of the tubeplate
> holes is far more important than it would be if brazing the tubes in -
> arguably the opposite, where one might like to have a slightly rough 
> surface
> to facilitate wicking of the solder, but for the rolled tube I would 
> assume
> a very smooth (and very round) surface would be preferable.
>
> As I say, however, I don't know - so I'd be interested in hearing the
> truth of the matter from anyone that actually knows.
>
> Is there a requirement for thicker tubeplates when rolling? Or narrower?
>
> Curiously
>
> Tim
> -- 
> Tim Kirby                   trk@xxxxxxxxxx
>
>
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