Re: [CAD_CAM_EDM_DRO] galling

>From: "Elliot Burke" <elliot@...>
>To: "CAD_CAM_EDM_DRO" <CAD_CAM_EDM_DRO@yahoogroups.com>
>Subject: [CAD_CAM_EDM_DRO] galling
>Date: Fri, Jul 27, 2001, 7:03 PM
>

> Once again I'd like to draw on the collected knowledge of this group:
>
> I need to fit a short cylinder (1.5" diameter x .4" long) into a hole. The
> fit will be very tight- I may lap them to get the .0001" or .0002" fit
> necessary. No lubricants allowed, since this will go into a high vacuum and
> needs to be clean.
> The fit should be free, as it has to be able to move slightly.
> The hole will be in a piece of stainless steel, 303 has been suggested.
> My problem is this: galling.
> Will the short cylinder gall as it is put into the hole?
> Should I make it out of brass, and if so, what kind?
> Any ideas about dimensional stability for these materials?
>
> They will be annealed after rough machining. Evidently 303 has less
> tendency to work harden than many other steels, it can be used for thread
> rolling.
>
> And yes, there will be a computer controlled motor involved, making very
> tiny motions.
>
> Thanks for the thoughts.
>
> Elliot
>
>
>
>
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