POTD- PROJECT OF THE DAY: What Did You Make In Your Shop Today?

[ChazzC]

Does anybody know what the thread is on the acetone can shown above? It seems to be between 6 and 8 TPI so maybe it's metric? Has anyone made a new cap for a container like this?

Next time, ask an easy question:


However, you were correct, it's between 6 & 8

 

[rwm]

But I can't turn a pitch of 7?

 

[ChazzC]

Get busy printing some change gears, or is now the time for ELS?

 

[woodchucker]

I think a garden hose is also 7.

 

[ChazzC]

I think a garden hose is also 7.

You could be right, but I think smaller than 1-1/4”. My hose fittings are buried in the garage (and it’s too cold to go digging.

 

[woodchucker]

You could be right, but I think smaller than 1-1/4”. My hose fittings are buried in the garage (and it’s too cold to go digging.

Yea, I'm not sure of the diameter

 

[mattthemuppet2]

Made a concrete pad for my leaning rain water tank, which was my first time working with concrete. Used some spare 1/2” rebar held about an inch off the ground as reinforcement

Also noticed a leaking outdoor tap. What a pita that turned out to be. The sealing surface was pitted, so turned that down on the lathe

Then I couldn’t get the screw holding the seal out and in the process of drill that put I snapped the drill bit. So I had to cut THAT out with a carbide endmill, followed by tapping for a new screw. Phew! Thankfully it all worked and the tap doesn’t leak anymore.

 

[ChazzC]

Yea, I'm not sure of the diameter

Also, the thread form most likely wouldn’t work: threads on the can/cap are rolled with a round profile - could grind a tool to replicate the profile for single-pointing.

 

[Boswell]

But I can't turn a pitch of 7?

If you cut a low tolerance 7 or 8 it might work just find for the few threads that it takes to tighten it.

 

[rwm]

If you cut a low tolerance 7 or 8 it might work just find for the few threads that it takes to tighten it.

Negative. For fun I turned an 8TPI. No way was it going on. The can spout has 3 total threads.
Under Goofs and Blunders I should include doing research on solvent compatibility before making gaskets. I assumed silicone rubber would resist acetone....WRONG. It is rated unsuitable. I also have some Neoprene; also WRONG. Now I need to buy some EPDM rubber. Painful cause I only need a piece that is 2 x 2"

EDIT: Just for fun look up the price for Kalrez. It is a synthetic rubber made by Dupont. Very solvent resistant. McMaster sells a 6 x 6 inch sheet for $1700! By weight that is well above gold and maybe platinum.