<p dir="ltr">Hi Hank,<br>
We used a flame facing machine recently at work to do a stainless steel flange on a pressure vessel about 800mm ID. We hired it to use ourselves at great expense, and the thing weighed a couple of hundred kilos, was very solid.</p>
<p dir="ltr">The fitter who did the job was very experienced machinist (but hadn't used one before) but could not get the finish very smooth - I can't find photos sorry, but it was like regular machining grooves but much larger - and it looked pretty ordinary. He spent several hours with a grinder cleaning it up.</p>
<p dir="ltr">On balance, it probably would have been easier to just flatten it manually with a grinder (but it was on a live liquefied natural gas plant and they don't like sparks:) ). Wasn't critical to get a flat face as we were just making room for a gasket in a slot to have more compression.</p>
<p dir="ltr">After getting it pretty flat with a straight edge, the fine stuff/quality control could be done by a thin layer of paint on a known flat plate or machined flange which you put on the welded flange and then where there is no paint deposited, you know that area is too low. Obviously paint is no good, but colored oil or 2-layered carbon paper (nice because then you have a trace of it) would probably work, or charcoal.</p>
<p dir="ltr">Cheers,<br>
Steve</p>
<div class="gmail_quote">On 06/03/2015 11:40 PM, "hank pronk via Personal_Submersibles" <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Brian,<br>
No, the machine is connected to the inside lip of the ring. The machine rotates on a center pivot. The cutter rotates instead of the part.<br>
Hank<br>
--------------------------------------------<br>
On Thu, 3/5/15, Brian Cox via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br>
<br>
Subject: Re: [PSUBS-MAILIST] Gamma ring machining<br>
To: "Personal Submersibles General Discussion" <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
Received: Thursday, March 5, 2015, 9:15 PM<br>
<br>
Hank, are you going to be<br>
turning the whole fricking sub ?<br>
<br>
Brian<br>
<br>
--- <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a><br>
wrote:<br>
<br>
From: hank pronk via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
To: <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a><br>
Subject: [PSUBS-MAILIST] Gamma ring machining<br>
Date: Thu, 5 Mar 2015 18:00:24 -0800<br>
<br>
Today my welder came to my shop and welded the reinforcing<br>
ring into Gamma, 10 passes, looks perfect!<br>
<br>
Next step, machine the ring. I am going to make a<br>
flange facing machine from a one ton truck full<br>
floater differential hub and a part or two borrowed from my<br>
spare lathe. The rig will be hydraulic drive. <br>
This may or may not work. :-) If it works and I<br>
am confident it will, I can also face CT lands, with the CT<br>
welded in place.<br>
Hank<br>
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