Re: (ET) Motor, belts, and underside wiring completed, time for topside

[David Brandt <ev_dave13 yahoo com>]

Use mcmaster-carr at www.mcmaster.com.  You can choose the exact material 
you want, or the specs you want your product to meet.  Plus they have 
about everything you could want.  I got a stainless, metric, male-female 
threaded adapter with matching washers and nuts there.  I thought I'd 
never find such a thing!

Interestingly, I looked up some thread forming screws there today.  410 
stainless is available.  They didn't have a lot of lengths in that 
material, though.

Grainger is similar, but I find mcmaster's catalog system easier to use.

David Brandt


--- On Tue, 11/9/10, Chris Zach <cz alembic crystel com> wrote:

> From: Chris Zach <cz alembic crystel com>
> Subject: Re: (ET) Motor, belts, and underside wiring completed, time for 
> topside
> To: "elec-trak cosmos" <elec-trak cosmos phy tufts edu>
> Date: Tuesday, November 9, 2010, 8:55 AM
> The problem with most nuts and bolts
> these days are that they seem to be made of zinc with steel
> "paint" on them. On the mower deck I took apart for example
> the 30+ year old bolts were fine and the ones I installed 3
> years ago had literally melted to nubs.
> 
> Big bolts as well; to get the mount for the mower arm off I
> literally had to weld the nubbin of a "bolt" to the steel so
> I could unscrew it.
> 
> So who makes real bolts these days?
> 
> C
> 
> 
> On 11/9/2010 8:15 AM, Chris Tromley wrote:
> > Steel is definitely the preferred choice here.  A
> stainless screw in a
> > steel hole will tend to corrode the steel
> aggressively.  Probably worse
> > in an iron hole.  If stainless is all you can
> find, smear some Vaseline
> > in the hole and on the screw to seal out moisture and
> limit the
> > corrosion.  And just in case anyone is confused,
> we're not talking about
> > a 3 point slot in the head like some security
> screws.  Tri-lobed screws
> > have the threaded shaft section gently squished on
> three sides so the
> > end looks a little like the rotor of a Wankel
> engine.  I mis-typed, they
> > are not self tapping screws, technically thread
> forming screws.  Search
> > on Taptite or shakeproof screws for more info.
> > Chris
> > 
> > 
> > 
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> 
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