[PSUBS-MAILIST] Press Fit

[Alan via Personal_Submersibles]

Hank,
not sure what you are meaning.
The piece ( front section of thruster) is held in the jaws.
I can hand hold the bearing in place & wind in the tail stock until the tool
in the tailstock engages the bearing. I then let go & continue winding the
tail stock. If I can't press the bearing in with the tail stock I back it off
& machine a bit more out of the bore & repeat the process.
Alan


Sent from my iPad

> On 30/03/2018, at 12:28 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Alan,
> The problem with your plan is, you will move your piece that your machining when you try to push the bearing in.  
> Hank
> 
> On Thursday, March 29, 2018, 4:09:52 AM MDT, emile via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> Hi Alan,
> 
> Press fit is good for a durable bearing construction. 
> Force is not leading, you're to late when the force is too high... You can
> find in a bearing handbook how much the diameter difference should be.
> Is about 0,02 to 0,03 mm  for small /medium bearings.
> Loctite 638 or 603 is a alternative.
> 
> Br, Emile
> 
> -----Oorspronkelijk bericht-----
> Van: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org]
> Namens Alan via Personal_Submersibles
> Verzonden: donderdag 29 maart 2018 11:33
> Aan: personal_submersibles at psubs.org
> Onderwerp: [PSUBS-MAILIST] Press Fit
> 
> Hi,
> I'm wanting to press fit a bearing in to my aluminium thruster housing &
> wondering if I could make a tool slightly less in diameter than my bearing,
> fit it in the lathes tail stock, & wind it in to force the bearing in to the
> press fit.
>   I have heard figures like 500lb force being used for press fitting, which
> I won't get winding the tail stock, & probably don't require as there is not
> a lot of dynamic force on the bearing. 
>   I imagine there will be a lot of trial & error involved getting the bore
> to the right diameter, & this method will allow me to keep the work in the
> chuck & keep doing fine passes until I get it to the right diameter.
> Any thoughts or experience with this thanks.
> Alan
> 
> Sent from my iPad
> 
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