Thread: Taper Turning

This is an attempt at taper turning a Morse No:3 taper with the
attachment on the lathe , the final cut was made with a RH Finishing
HSS tool and water turning Speed RPM 33 , feed rate 0.1 and coolant
just driping on the tool,the surface finish turned out pretty good but
the Taper was a little bit out , I measured it using the Morse No:3 taper gauage.

















No matter how many adjustment I have made I cannot get the
taper turning attachment settings accurate enough to get a Morse
taper correct . I find the Tail stock Offset method a lot more
accuarate , anyhow back to machine shop at a 2nd attempt.

Originally Posted by Blknight.aus

I cheat, I cut a tool with the cutting face the same angle as the taper required then set that up square and do a series of straight in cuts, of course I dont have an angle feed on my lathe.

Dave, How do you measure your Taper once it's done and what's the surface finish like with the "Described" cutting tool once you have cut to the taper same angle as the Tool ? are you relying on the angle that you have cut on the face of the tool to give you the approximately correct taper ?

Originally Posted by Hall

You can use the top slide, a sine bar and gauge blocks if you can get hold of those items. Use a dial indicator magnet to hold the sine bar on the side of the top slide. Set the sine bar to the corect angle using the gauge blocks. Or you could make a packer to suit. Then clock the sine bar parallel to the work piece. Now the top slide is set exactly to the angle. You will notice with this method that the angle scale on the cross slide for the top slide is most likely not real acurate. But this method is good when you want to turn external and internal mating tapers. Even if the angle is not exact the internal and external angles will be the same.
Cheers Hall

G'day Hall ,The method described looks to be more suited for turning a matching internal and external taper and not necessarily for a set taper ( i.e a Morse No:3 ) I guess the Idea of the above excercise was to turn a No:3 Morse using a Taper turning attachment on the lathe and making the appropriate adjustments. since I had to get close to 5/8 " inch tapered adjustment using the markings and the attahcment markings would not give me accurate results Another method I found to give me good result was to replace the tail stock centre with a Morse 3 Tapered spindle and dialled into using a Dial indicator at centre height and with the handle on the sadlle I moved it the entire length of the more 3 taper while making the appropriate adjustments on the Taper turning attachment until I achieved a reading of 0 on indicator thru the entire lenth and this method gave me pretty close to the morse 3 taper.