On Monday, 6 July 2020 07:49:35 UTC+1, Thomas Prufer wrote:
On Sun, 5 Jul 2020 01:13:54 -0700 (PDT), polygonum_on_google
wrote:

Is there anything special about the cutting lubricant? Or would I get away with ordinary lubricants?

I have threaded 3/4" galvanised by hand.

Eight threads by hand is not a problem: Put you weight on it and it's work, but
not hard work. Using (clean) motor oil for cutting will be fine; use plenty, and
reapply. A pipe vise will make the work *much* easier. If you use a regular
vise, perhaps you will need a helper with a long pipe wrench to counteract the
cutting torque.

Cut the pipe using a "pipe cutter for galvanised pipe", one of those roller
things as for copper pipe, only heftier. Pleasure to use: perfectly square ends,
no outside burrs, quick, silent.

https://www.screwfix.com/p/rothenber...e-cutter/8126k

Don't turn it 360, but go back and forth:

https://youtu.be/J6KyF96baWM

Rothenberger make/made something called a "Sanikit" which has dies and a pipe
cutter in it, at a reasonable price -- perhaps available for hire?

And there are/were chinese knockoffs of that kit in the 30‚¬ range -- though the
one time I tried to buy one, the lady behind the counter said she wouldn't
guarantee the dies for even the few threads I needed. (She told me leave a
deposit and ID, and take this 400‚¬ pro tool and bring it back clean and whole,
and she'd know by the state of the cutters if I'd skimped on the oil so don't do
that, please?)


Thomas Prufer

Thank you - very helpful and interesting.

At the moment, I am thinking that for Mach I, I'll get the pipe supplied threaded. Then, maybe, switch to 25mm pipe if I decide to go ahead with Mach II, III, etc. Or at least, I'll understand what is possible.