MOTM

As Paul mentioned in his update, these are larger than the Switchcraft 
washers used on other MOTM modules.  The jacks are larger in diameter, 
too, and take a different nut size.  A slightly smaller washer, ideally 
the same outer diameter as the regular washers with an inner diameter 
big enough to fit the jacks, would improve the appearance of the 650.  
The washer sizes are:

Switchcraft:  O.D. 5/8 inch (about 16mm), I.D. 3/8 inch (about 9.5 mm)
650 washer:  O.D. 18mm, I.D. 12 mm

The ideal washer would be O.D. 16 mm and I.D. 10 - 12 mm (12 is larger 
than necessary).  I am not sure what's the minimum to fit the jack, but 
it's larger than 3/8 inch.  Paul, what hole size is drilled for these 
jacks?   If anyone finds such a washer obtainable in the U.S. in 100 
quantity I would be interested.  (I imagine that Paul applied due 
diligence here, but who knows what we all might find.)

Richard Brewster
http://www.pugix.com

Here's a list of 600 standard flat washers:

http://www.wclco.com/pdf/flatwash/fw10-25.pdf

My guess as to the 650 washer that Synth Tech supplies is:   7/16 .469 
.734 .062 MS27183.  Interpreting:

.469" ID x .734" OD x .062 thick.

If you look a little below this in the chart, there is one listed 7/16 
.472 .625 .032 AVAILABLE.  This one is just about the same Inner 
Diameter, but is .625 inches O.D.. Is this what we want?  It is half the 
thickness.  Here is the washer page:

http://www.wclco.com/Flat_Washers/Index.php

They have a $100 minimum order.  How many washers you think $100 buys?

-Richard

Richard Brewster wrote:

> As Paul mentioned in his update, these are larger than the Switchcraft 
> washers used on other MOTM modules.  The jacks are larger in diameter, 
> too, and take a different nut size.  A slightly smaller washer, ideally 
> the same outer diameter as the regular washers with an inner diameter 
> big enough to fit the jacks, would improve the appearance of the 650.  
> The washer sizes are:
>
> Switchcraft:  O.D. 5/8 inch (about 16mm), I.D. 3/8 inch (about 9.5 mm)
> 650 washer:  O.D. 18mm, I.D. 12 mm
>
> The ideal washer would be O.D. 16 mm and I.D. 10 - 12 mm (12 is larger 
> than necessary).  I am not sure what's the minimum to fit the jack, but 
> it's larger than 3/8 inch.  Paul, what hole size is drilled for these 
> jacks?   If anyone finds such a washer obtainable in the U.S. in 100 
> quantity I would be interested.  (I imagine that Paul applied due 
> diligence here, but who knows what we all might find.)
>
> Richard Brewster
> http://www.pugix.com
>
>
>
>  
> Yahoo! Groups Links
>
>
>
>
>
>

I found some washers that look pretty nice.  They are just zinc plated 
but not much of the washer really shows.

They are 0.470 ID x 0.656 OD x 0.030 thick

They are just slightly larger than the 112A switchcraft washers.
0.460~0.465 ID would be about the smallest you can get on these jacks 
so the 0.470 fit reasonably snug.

I don't know where they came from originally but I can try and find 
out.  I put a photo up in the photo section.  You can see some slight 
scratches caused by the larger washers.  They're pretty minimal unless 
you get the light just right.

Dave Brown


--- In motm@yahoogroups.com, Richard Brewster <pugix@...> wrote:
>
> As Paul mentioned in his update, these are larger than the 
Switchcraft 
> washers used on other MOTM modules.  The jacks are larger in 
diameter, 
> too, and take a different nut size.  A slightly smaller washer, 
ideally 
> the same outer diameter as the regular washers with an inner 
diameter 
> big enough to fit the jacks, would improve the appearance of the 
650.  
> The washer sizes are:
> 
> Switchcraft:  O.D. 5/8 inch (about 16mm), I.D. 3/8 inch (about 9.5 
mm)
> 650 washer:  O.D. 18mm, I.D. 12 mm
> 
> The ideal washer would be O.D. 16 mm and I.D. 10 - 12 mm (12 is 
larger 
> than necessary).  I am not sure what's the minimum to fit the jack, 
but 
> it's larger than 3/8 inch.  Paul, what hole size is drilled for 
these 

> jacks?   If anyone finds such a washer obtainable in the U.S. in 100 
> quantity I would be interested.  (I imagine that Paul applied due 
> diligence here, but who knows what we all might find.)
> 
> Richard Brewster
> http://www.pugix.com
>