Homemade Rose Engine / Threading Jig

Projects | Threading Jig

threading jig


The first attempt at a threading jig was simple, used materials on hand and worked pretty well. The most important thing I wanted was the capability to cut multiple thread pitches. It performed very good. The biggest draw back was the mating of the spindle nose and shaft which were off about .010", producing a noticable offset between the lid and body.

The second generation threading jig took a little different design approach with a single post support for the headstock. Another improvement was to add adustment into the spindle nose. Reworked the thread followers for quicker changes.

The third generation jig was never fully realized. It was a good idea using parts from a radial arm saw and a stock lathe headstock. The bearings in the radial arm carriage turned out to have to much play, so I abandoned the project before getting to far. It did have radial and axial rotation and movement for full rose engine potential.

The fourth generation jig is the current one in operation. It is similar to the first generation jig but with pivot built in for rose engine capability. It carries the same shaft and spindle nose as the second generation jig, set in a different bushing set up. The fine adjustment has been moved back to the thread cutter. Current configuration is set up to cut 11, 12, 13, 14 TPI. Added some supports to the front bushing assembly. Replaced the lower right hand thread lead screw on the cross slide with a left hand thread screw. Added a ball bearing to the lead screw and extended the mount.

Am finally getting around to the rest of the components for rose engine turning. Completed the cutter head for the universal cutting frame. It has a pulley sized for 1/4" drive belt and is bored to accept 1/4" round tool bits.

Projects | Threading Jig

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