Narghile hookah adapter

[vance]

I'm attempting to make an M20 x 1.5 x 9/16" x 18 tpi adapter for the Narghile hookah regs.

The original connection between the DH second stage and a remote first stage was a hose with either a metric or an imperial LP hose fitting, and the barbed end of the Narghile which was secured with a hose clamp.

I'd like to make this so a common 3/8 x 24 to 5/8" x 18tpi LP hose can be connected to the Narghile second stage from any first stage with a 3/8" x 24 LP tap.

This is in process, while I learn to make M20 x 1.5 inside threads. Cool project!

I've collected the proper tooling and have done some test cuts which came out wrong (1.0 mm), but clean. The error was b/c the on-line change gear calculator was wrong.

Costly mistake. I need to check the threads with a super minor cut at first, to be 100 percent sure.

[vance]

I salvaged the part that got 1.0 threads. I revised the change gear train setup, and did a thread check. This combination is correct. I rebored the stock and single point threaded it with internal M20 x 1.5mm. I'll have just enough material to turn the other end down for the regulator end LP hose fitting, which is 9/16 x 18 tpi. This one may be ugly, due to circumstances, but it should work. Regardless, reworking it allowed me to go to school on it for free.

Turning a part on the lathe is all about an ordered sequence of steps and how you're going to hold the part in the chuck while you do what is necessary to both ends. You really need to plan each operation and in what order it's going to be done.

I've been learning a lot lately, and as with all of the technical skills, it's exciting when the cumulative knowledge, understanding of technique, and acquired skill sets snowball and start growing fast!

I'll post a photo when I get a chance to go back to it. In the middle of things, the grandbaby came over, so I put the adapter on the back burner for the day.

[vance]

An interesting aside:

I printed a change gear combination chart from a website that is acknowledged as reliable. These charts show 4 different combinations of 4 gear sizes which, when installed in the gear train, should result in a 1.5mm thread. The gear positions are A, B, C, D.

Each of the 4 combinations has the same set of gears, but placed in different positions. At least one of the suggested combination/position sets on the chart did not produce the intended thread. There must be some inequality in the fixed gear pinion positions that causes one combination to work and another to produce a different result.

Odd.

[vance]

I finished the adapter today. I connected the regulator to a first stage, and both the adapter and the regulator work! The second stage seat I made held fine.


I need to make a couple more of these adapters, but I'm going to use hex stock instead of round. I just don't have any on hand, and the metals supplier was out. I may just modify a couple of fittings I bought.

[nikeajax]

Phil, nice work my friend I can't wait to see it with a label

JB