[PSUBS-MAILIST] Press Fit

[Alec Smyth via Personal_Submersibles]

Hi Alan,

This sounds a lot like replacing the front wheel bearings in my son's race
kart. It's a press fit into aluminum. Just make yourself a little cylinder
of solid aluminum or plastic that is a hair smaller OD than the bearing,
sit the bearing down over the hole its going into, hold your custom made
aluminum or plastic rod onto the bearing, and tap with a mallet. Your
custom rod allows you to put the mallet force onto the outside edge of the
bearing. What you don't want to do is drive the bearing from the inside run
and have the resistance act on the outside run.

Best,

Alec



On Thu, Mar 29, 2018 at 9:43 AM, 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
> 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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