Alco- I wonder what's the story here

[Spehro Pefhany]

http://media.digikey.com/photos/Tyco Alcoswitch Photos/MTM106DPC.jpg


Note the washer internal D and the flats partially machined onto the
switch bushing.

Best regards,
Spehro Pefhany

 

[Syd Rumpo]

http://media.digikey.com/photos/Tyco Alcoswitch Photos/MTM106DPC.jpg


Note the washer internal D and the flats partially machined onto the
switch bushing.

Best regards,
Spehro Pefhany

That's quite common - you drill a small hole next to the mounting hole
and the tab on special washer sits in the small hole preventing switch
rotation.

Save drilling a D-shaped hole.

Cheers

 

[Baron]

Syd Rumpo Inscribed thus:

That's quite common - you drill a small hole next to the mounting hole
and the tab on special washer sits in the small hole preventing switch
rotation.

Save drilling a D-shaped hole.

Cheers

But the flat doesn't go all the way to the top of the threads !

 

[Spehro Pefhany]

That's quite common - you drill a small hole next to the mounting hole
and the tab on special washer sits in the small hole preventing switch
rotation.

Save drilling a D-shaped hole.

Cheers

Whilst your suggested arrangement might look nice in a Solidworks 3D
assembly model, with no interference or other obvious problems, I'm at
a bit of a loss as to how one would go from the parts as shown to the
assembly in real life.

 

[Baron]

Spehro Pefhany Inscribed thus:

Whilst your suggested arrangement might look nice in a Solidworks 3D
assembly model, with no interference or other obvious problems, I'm at
a bit of a loss as to how one would go from the parts as shown to the
assembly in real life.

Without the flat continuing to the top of the threads you couldn't
assemble the anti rotation washers.

 

[Syd Rumpo]

Spehro Pefhany Inscribed thus:


Without the flat continuing to the top of the threads you couldn't
assemble the anti rotation washers.

D'oh.

 

[John S]

http://media.digikey.com/photos/Tyco Alcoswitch Photos/MTM106DPC.jpg


Note the washer internal D and the flats partially machined onto the
switch bushing.

Best regards,
Spehro Pefhany

Below the Digikey image you reference is the note:

"Image shown is a representation only. Exact specifications should be
obtained from the product data sheet."

If you access the mechanical drawings and data sheet, available on the
same Digikey page, you will see the actual situation.

John S

 

[Spehro Pefhany]

Below the Digikey image you reference is the note:

"Image shown is a representation only. Exact specifications should be
obtained from the product data sheet."

If you access the mechanical drawings and data sheet, available on the
same Digikey page, you will see the actual situation.

John S

Bzzzt. Nope.

The bushing drawing is incomplete (only shows the thread and length)

The part drawing shows a slot (not visible in the photo) but no flats

The actual part wot I have on my desk looks like this:
http://speff.com/Alco106D.jpg

The anti-rotation washer does not look like the one in the photo, it
actually works.

Can anyone come up with a remotely plausible explanation (other than
the obvious one of a face-palm screw-up) of why those partial flats
are on there?

 

[[email protected]]

Bzzzt. Nope.

The bushing drawing is incomplete (only shows the thread and length)

The part drawing shows a slot (not visible in the photo) but no flats

The actual part wot I have on my desk looks like this:
http://speff.com/Alco106D.jpg

The anti-rotation washer does not look like the one in the photo, it
actually works.

Can anyone come up with a remotely plausible explanation (other than
the obvious one of a face-palm screw-up) of why those partial flats
are on there?

Maybe for a post-install U-thingy, with the top threads left full to
make the double-nut assembly stronger.

 

[Joerg]

http://media.digikey.com/photos/Tyco Alcoswitch Photos/MTM106DPC.jpg


Note the washer internal D and the flats partially machined onto the
switch bushing.

You are supposed to beam it across the non-flattened area, using a
tricorder.

 

[Spehro Pefhany]

Maybe for a post-install U-thingy, with the top threads left full to
make the double-nut assembly stronger.

That's the best I could come up with-- then I saw the Digikey photo of
the washer and the penny^H^H^^H nickel dropped.

 

[Spehro Pefhany]

You are supposed to beam it across the non-flattened area, using a
tricorder.

Darn, and my tricorder needs a fresh set of AA's.

 

[Lasse Langwadt Christensen]

Bzzzt. Nope.



The bushing drawing is incomplete (only shows the thread and length)



The part drawing shows a slot (not visible in the photo) but no flats



The actual part wot I have on my desk looks like this:

http://speff.com/Alco106D.jpg



The anti-rotation washer does not look like the one in the photo, it

actually works.



Can anyone come up with a remotely plausible explanation (other than

the obvious one of a face-palm screw-up) of why those partial flats

are on there?

is there a flat on both sides or just one?

-Lasse

 

[josephkk]

That's quite common - you drill a small hole next to the mounting hole
and the tab on special washer sits in the small hole preventing switch
rotation.

Save drilling a D-shaped hole.

Cheers

OK so far. Seen that before. Now how do you get the washer on?

?-)

 

[josephkk]

Bzzzt. Nope.

The bushing drawing is incomplete (only shows the thread and length)

The part drawing shows a slot (not visible in the photo) but no flats

The actual part wot I have on my desk looks like this:
http://speff.com/Alco106D.jpg

The anti-rotation washer does not look like the one in the photo, it
actually works.

Can anyone come up with a remotely plausible explanation (other than the
obvious one of a face-palm screw-up) of why those partial flats are on
there?

With a clear and reliable photo i am beginning to wonder if i missed
something. I think i see a way to assemble it in a real panel, but it is
really going to bite if it is soldered to a PCB. Most especially if not
at the edge.

??-)

 

[George Herold]

Bzzzt. Nope.



The bushing drawing is incomplete (only shows the thread and length)



The part drawing shows a slot (not visible in the photo) but no flats



The actual part wot I have on my desk looks like this:

http://speff.com/Alco106D.jpg



The anti-rotation washer does not look like the one in the photo, it

actually works.



Can anyone come up with a remotely plausible explanation (other than

the obvious one of a face-palm screw-up) of why those partial flats

are on there?

I think some people might be confused. You are asking why they machined part of the thread away. (And not about flat on the thicker part of the bushing that fits the D shaped washer.) (Or I'm confused.)
So maybe they touch down with the mill on the threads to 'find' the depth and then mill the D in the bushing.
That's my only guess.

George H.

 

[George Herold]

I think some people might be confused. You are asking why they machined part of the thread away. (And not about flat on the thicker part of the bushing that fits the D shaped washer.) (Or I'm confused.)

Ahh, never mind... I'm confused.. nothing new.

George h.

 

[Robert Baer]

http://media.digikey.com/photos/Tyco Alcoswitch Photos/MTM106DPC.jpg


Note the washer internal D and the flats partially machined onto the
switch bushing.

Best regards,
Spehro Pefhany

That partial machining (for the "D") makes it impossible to use the
alignment/locking washer.
Someone really F'ed up and other idiots did not catch the problem,
including the photographer.

 

[Robert Baer]

That's quite common - you drill a small hole next to the mounting hole
and the tab on special washer sits in the small hole preventing switch
rotation.

Save drilling a D-shaped hole.

Cheers

Will not work when that washer is useless..

 

[Robert Baer]

Syd Rumpo Inscribed thus:


But the flat doesn't go all the way to the top of the threads !

EGGS-Zact-lee!!