[PSUBS-MAILIST] new dome progress

[Alan via Personal_Submersibles]

Hank,
hope it goes well.
Wonder how hard it would be to make a vacuum chuck!
Weld a pipe with a thread on it to a work piece that you machine a slight
step in to, glue a ring of rubber to it, fit a rotary union on the threaded
end & attach a vacuum pump.
Alan

> On 16/10/2019, at 12:35 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Alan,
> Wes that is the start of a shoulder to grab it, good eye.  Once the opposite side of the dome is machined I can not grab it in the jaws as you suggest.   I have made an attachment that replaces my live centre, I guess its still kind of a live centre.  It is a bearing assembly that pushes against the dome so it is sandwiched in place.  That will hold it to machine the conical seat.  I have done this in the past with a live centre but the bearings don't hold up long, so I built one with a large bearing.  I had to come up with a step by step plan because if I machine in the wrong order I can get trapped with no way to hold it.  I need a vacuum chuck!
> Hank
> 
> On Monday, October 14, 2019, 9:20:16 PM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> A work of art Hank.
> I see you have cut a shoulder for the jaws to grip to.
> What is the plan for getting rid of the shoulder?
> Alan
> 
>> On 15/10/2019, at 9:05 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> 
>> Hi All,
>> I spent the entire 3 day weekend machining the inside radius of my new dome.  My radius turning attachment I built is working just fine, and is built to machine the inside and outside radius.
>> Hank
>> <thumbnail.jpeg>
>> <thumbnail.jpeg>
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