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.RC.
07-25-2008, 03:17 AM
I have some 3" ID brass that has to have an internal thread put in either end..

I will have to use a steady rest but since the steady has brass pads I am concerned that they will wear the brass tubing as the threads are being cut...

Should I make a set of roller pads for the steady or would the brass on brass not wear while the thread is being cut???

http://img.photobucket.com/albums/v606/OzRinger/pumpbrass007.jpg
http://img.photobucket.com/albums/v606/OzRinger/pumpbrass008.jpg

rbregn
07-25-2008, 03:30 AM
Take 3 small pieces of cloth backed emery and put the grit side against the pads add oil and adjust. I do this on everything I have to use a steady for if it doesn't have rollers.

oldtiffie
07-25-2008, 05:36 AM
Don't set the brass pads too tight - a little bit "loose" if possible. The weight will rest on the two lower pads.

Cut the thread with the lathe in reverse and the tool inverted as this will ensure that the tube does not try to rise over the threading tool and so tend to "lift off" the bottom two pads and so try to engage with the top pad. Gravity is your friend.

Use good "not too sticky" oil or grease, keep it up and don't run too fast and you should be OK.

The other thing of course is to consider making and using a "spider" or "cat-head" which fits over the job, is adjusted for concentricity with 2 rows of 3 or 4 screws and engages in the steady rest.

http://i200.photobucket.com/albums/aa294/oldtiffie/Spider1.jpg

I'd be inclined to fit ball-bearing rollers in place of the 3 pads on your fixed and moving steady rests as a matter of course.

.RC.
07-25-2008, 06:55 PM
Thanks for the help...Maybe I should have lashed out and bought this..

http://cgi.ebay.com.au/metal-lathe-NUTTAL-series-17_W0QQitemZ110273346466QQihZ001QQcategoryZ92083QQ ssPageNameZWDVWQQrdZ1QQcmdZViewItem

mark61
07-25-2008, 07:47 PM
How about slipping a steel ring over the brass tubing for the steady rest to ride on? Nothing to worry about then.

mark61

radioman
07-26-2008, 11:21 AM
I also use emery cloth in my steady rest with the grit facing towards the pads. One other thing I have done is to drill a hole in the top back side of the rest and install a quick disconect and apply a flood of coolant at this point. No heating up and expansion of the work piece to cause problems.;)

Dennis