Small Projects #27: Twin Screw Lidded Purpleheart Pipe Design

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Blog entry by Madmark2 posted 04-24-2020 01:37 AM 554 reads 0 times favorited 2 comments Add to Favorites Watch
« Part 26: Purpleheart Leftovers Box Part 27 of Small Projects series Part 28: Dual Bowl Twin Screw II »

My head shop customer asked me for some smaller lidded pipes. The pipes suffer from ng the same issue as most dugouts, the screw works loose, the lid opens and the (usually expensive) contents spills.

The solution to this is the same as for the dugouts, twin screws. One acts as a pivot, the other a locking pin. Until the locking screw is removed the lid cannot open.

Here is a collage of my latest prototype:

Twin screws for no leaks

On the original lid design the lid and body need to be drilled as a set to insure perfect screw alignment. On the first iteration I used a sheet of newspaper as a fault line and glued the pieces together for drilling. This was messy, time consuming, and the paper residue had to be sanded off. With the new design the lid is thinner and taped to the body for drilling, thus speeding and simplifying manufacturing.

Learned that I can use the drill driver to run the tap in and out – much faster than hand tapping. I’m using Johnson’s paste floor wax as a lube with good results.

One rule of thumb about production is every time you 10X your volume, you should be able to cut your production cost by half. Tape vs glue and power vs hand threading help boil the labor out of the production to drive the costs down and my (admittedly small) profits up.

Once final finishing is complete I shrink wrap the pipes for general cleanliness and to support my “never lipped” promise.

Shrink Wrapped for Sale

Never Lipped!

-- The hump with the stump and the pump!

2 comments so far

View mel52's profile


2422 posts in 1726 days

#1 posted 04-24-2020 03:28 AM

Have never seen a pipe like this, looks like it would work real good. Good job !!! Mel

-- MEL, Kansas

View Madmark2's profile


3444 posts in 2049 days

#2 posted 04-24-2020 03:34 AM

They’re MONSTER hitters.

Google: etsy purpleheart pipes, click the Shopping tab, and Custom exotic wood pipes at reasonable prices is about #10 down.

-- The hump with the stump and the pump!

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