[PSUBS-MAILIST] Press Fit

[Alan via Personal_Submersibles]

Thanks for the advice guys.
The bearing diameters are 35 & 24mm.
I went to a lot of fuss last time I did this & ended up having to use loctite as 
the last pass on the lathe took too much off.
Emile, I will shoot for .02-.03mm & see how that goes. Have found other advice
saying .03. But found a lot of confusing information googling.
I was intending to heat & freeze parts prior to pressing.
Hugh, I have been using inside callipers & measuring  off these with the digital callipers.
The digital callipers are on the cheap side so may upgrade them & as you say,
purchase telescopic gauges the right size.
Also on my radar is a 10 ton hydraulic hand operated press, as I am also press
fitting the two end sections of the thruster in to a tubular middle section. I am 
figuring that with epoxy in the press fit, screws & an epoxy paint finish it should 
be water tight without o-rings.
Cheers Alan




Sent from my iPad

> On 30/03/2018, at 8:42 AM, Hugh Fulton via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Alan,
> What diameter is the bearing?
> As the guys are saying it is a real test of your machining accuracy.  Do you
> have a micrometer and telescopic gauges the right size?  If you are relying
> on digital calipers you are playing with fire.  The answer to your question
> is yes you can push the bearing in with the tailstock but they don't have
> much push.  You can use a vice as well if it is in good condition.  I
> suspect you are talking about something that is possibly only 30-40mm.  It
> is very easy to over machine but you can use Loctite if you want to.
> Suggest you  try a bit of aluminium bar as a test piece first.  Easy to
> machine it off after or push it right through.
> Hugh
> 
> -----Original Message-----
> From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org]
> On Behalf Of Alan via Personal_Submersibles
> Sent: Thursday, 29 March 2018 10:33 PM
> To: personal_submersibles at psubs.org
> Subject: [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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