[PSUBS-MAILIST] Press Fit

[hank pronk via Personal_Submersibles]

 Alan,Even with your part in the chuck tighten down it can still move, your talking about some pretty precise stuff here.  Give it a try first, put your part in and machine some and push against it and then machine it again and see if it is  off.  Your better off finding the perfect size the first time.   This is why I have to make parts more than once lolHank 
    On Thursday, March 29, 2018, 7:44:08 AM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 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 toolin the tailstock engages the bearing. I then let go & continue winding thetail 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

_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles

_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
  

_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles

_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
  
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20180329/3d5632b7/attachment.html>