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mototed
05-20-2013, 06:07 PM
I have a project for the house that requires some garden hose threads. My lathe will do 11 TPI, 12 TPI and with some gear swapping a .288 mm TP.
I would like to be able to mate them up to commercially available products with out and threads binding too bad.
These are external threads that will mate up to a typical garden hose washer.
Any hints on how to make these 11.5 TPI threads ?

Thanks,
Ted

John Stevenson
05-20-2013, 06:11 PM
What gears do you have [ list please ] and what pitch is the leadscrew ?

luthor
05-20-2013, 08:02 PM
I have a project for the house that requires some garden hose threads. My lathe will do 11 TPI, 12 TPI and with some gear swapping a .288 mm TP.
Thanks,
Ted

What's a .288mm TP ? .288mm equals .0113inches.

mototed
05-20-2013, 08:28 PM
I have a 6 tpi leadscrew and 30,42.54,60,90, and 127 change gears.
http://i217.photobucket.com/albums/cc28/mototed/DSC00788_zps8ca4b046.jpg (http://s217.photobucket.com/user/mototed/media/DSC00788_zps8ca4b046.jpg.html)

Black_Moons
05-20-2013, 09:30 PM
Garden hose threads don't mate up very deeply, Maybe if you do 11 or 12TPI with shallow threads it will work over 1/4" or so just fine? Its the washer that does the sealing.

Alternatively, get some pipe tapes/dies, and buy the very commericaly available NPT to garden hose adapators (Come in all sizes)

Duffy
05-20-2013, 11:16 PM
I just last week made two 5/8" male hose connectors and used 11 TPI. They worked fine. I checked the thread on the store-bought connector, and thought that it WAS 11 TPI, but maybe I was wrong. Anyway, they worked. My original complaint was that I could not get a screw-clamp to make a leak-proof joint. I discovered that the commercial fitting was a "drop fit" in the hose. I made mine a push-fit and they dont leak.

paulsv
05-20-2013, 11:23 PM
Is the bottom of that chart the feed rates available? I think I see an 0.088 feed rate, which is pretty close to 11.5 (0.087).

Paul Alciatore
05-20-2013, 11:52 PM
Or buy some brass hose ends and solder or thread them on to your parts.

John Stevenson
05-21-2013, 04:43 AM
Use 2.25mm pitch.
The error is only 0.0016" per rev.

mototed
05-21-2013, 06:00 AM
Thanks for the replies,
I will give 2.25mm pitch a try.

Ted

Don Young
05-22-2013, 09:22 PM
If you can swap the 54T and 90T gears the lever settings for 32 TPI (III 1 and I 9) will give you 11.52 TPI. If you leave the 90T gear in its original place and replace the 54T gear with the 42T gear the lever setting for 9 TPI (II 2) will give you 11.571+ TPI.