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Holding over length tube for turning ( with pictures!)

hvnlymachining

Hot Rolled
Joined
Jun 21, 2019
Location
St.Onge
Since this comes up so often in the forum, I thought I'd get pictures this time and post them up to give the newbies a visual reference for holding hollow tube at the chuck.

This is a new hollow chrome hydraulic rod I'm just finishing up, 2-3/4" OD x 2" ID x 104" long. And unfortunately too long for my lathe.

I made the expanding arbor to use a Morse taper as a wedge and a bolt through the mandrel to draw the taper tool tight. ( Yes, that's a chunk of old chrome rod) I had an old reamer with an MT3 taper with threaded base that fit, so I didn't have to build that part.


IMG_20240524_103424222_HDR.jpgIMG_20240524_103440401.jpgIMG_20240524_104743548_HDR.jpg



Also a pair of master thread gauges
(2-3/4" 12 UNF)
Since fitting the piston to the rod or vise versa would be nearly impossible.

IMG_20240524_132330747.jpg

These tools were from 4140 HT steel if anyone is curious.
 
Nicely done! Thanks for sharing.

I had an old reamer with an MT3 taper with threaded base that fit, so I didn't have to build that part.

Are you saying you used an old reamer as the cone to drive apart the arbor?

The slits look nicer than typical bandsaw work. Roll-in saw?
 
Nicely done! Thanks for sharing.



Are you saying you used an old reamer as the cone to drive apart the arbor?

The slits look nicer than typical bandsaw work. Roll-in saw?
The reamer had an MT3 shank, which was already threaded for a drawbar.

The slits were cut with a steel cutting blade on my Cincinnati vertical mill.

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They work surprisingly well with flood coolant.
 








 
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