Washer sizing

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aamcle
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Re: Washer sizing

Post by aamcle » Sat Jun 30, 2018 8:11 am

Messing about with ptfe seems unreliable so the options seem to be

Use a nut
Solder a washer on
Get a bit of 3 - 4mm polypropylene drill a hole in it and run that up the elbow.
Attach the strainer with a good big glob of food grade silicone mastic.

That sort of silicone takes time to get to its final strength and hardness but it's strong.

A back nut top and bottom of the mesh or false bottom is the easy and cheap option.

Atb. Aamcle

sbond10
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Re: Washer sizing

Post by sbond10 » Sat Jun 30, 2018 12:52 pm

I found brass ones in toolstation so think ill be using them

aamcle
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Re: Washer sizing

Post by aamcle » Sat Jun 30, 2018 8:24 pm

Nothing wrong with a bit of brass :)

Aamcle

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LeeH
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Washer sizing

Post by LeeH » Sun Jul 01, 2018 3:02 am

aamcle wrote:Nothing wrong with a bit of brass Image

Aamcle
Not had any since I found this hobby.

Too much shiny.


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sbond10
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Re: Washer sizing

Post by sbond10 » Sun Jul 01, 2018 2:12 pm

So tried the flanged back nut its a deffo on go as theres not enough thread

Fil
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Re: Washer sizing

Post by Fil » Sat Jul 07, 2018 2:29 am

aamcle wrote:
Sat Jun 30, 2018 8:11 am
Messing about with ptfe seems unreliable so the options seem to be
your missing the point, or i failed to make it.. the ptfe is just to lube the threading of a snug fitting washer up the tapered thread and avoid the SS cold welding (edit as its easier to screw the washer up unevenly than it is perfectly perpendicular to the fitting so it presents a sealing face)

the point is to select a ss washer which has a slightly smaller id than optimum for usual use, my ebay history doesn't go back that far so i cant provide links to the sellers who sold me SS M20 washers in iirc B and D profiles which were not made to the tightest tolerances, when building my bigger brewery i relied on m20 washers sitting snugly on the lip/hex of the 1/2" bsp hex nipples i used to breach m20 holes in my pots, out of a bag of 10x 4-6 would usually be a good fit for the job with at least 3 or so either too small or big with respect to the ID.

if you dont want to take a punt on dodgy sized m2o washers buy some m19 instead and sit down with a file for an evening or two and whittle out whats not needed..

edit this approach also requires a Tapered thread on the fitting end on which the washer is to be fixed, it wont work on a parallel thread ;)
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