[PSUBS-MAILIST] O-ring groove machining

[hank pronk via Personal_Submersibles]

Alan,Are you talking about the edge on top of the groove, or the bottom radius.  I use a file first then wet sand paper.  With Aluminum, the sand paper will do it all.  If you are talking the bottom radius, I grind my tool ( parting tool)  with the radius in it.Hank 

    On Friday, February 24, 2017 5:41 PM, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
 

 
Hi Alan, you can use a tiny file, but be careful it doesn't kick back at you.

--- personal_submersibles at psubs.org wrote:

From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
To: personal_submersibles at psubs.org
Subject: [PSUBS-MAILIST] O-ring groove machining
Date: Sat, 25 Feb 2017 12:41:39 +1300

Am cutting some small o-ring grooves in aluminum, 3.4mm x 2mm deep for
a 2.5mm D o-ring. ( 10th of an inch) What is the best way to remove the sharp 
corners of the grove? I have read that you can spin your work in the lathe
& sand with 200 & then 400 grit sand paper. Is this right?
Have been having fun making the tool for this & don't think I have done a 
good job! Am I best to buy a carbide tool specific for this job.
Thanks, Alan

Sent from my iPad

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