Metric Taper Designation

[machinistmarty]

with your compound on the same angle, every .001 on compound would be .0001 off the diameter.

 

[rmack898]

Thanks to everyone for the help. I cut the taper yesterday and the fit was good but I think I can make it better. After cutting the taper I had to drill and tap the end of the shaft. I was power tapping the thread with the lathe in back gear and had a little accident and spent the day in the ER. The problem was that I got distracted with someone standing over my shoulder asking a million questions, I let my guard down and got hurt. Machines deserve our full respect at all times, and that all that I have to say about that.

Not having an actual shaft to copy and put in the lathe and use a DTI to set the compound, I was able to get close and the fit was ok. But I will make another one tomorrow and use a dial indicator to set my compound angle off of a piece of ground round stock. I think I will get a much better fit.

 

[18w]

Glad you are o.k. And yes, machine tools do not have the same feelings about us that we have about them.

Darrell

 

[machinistmarty]

Darrell, A very good way to set up a taper is to use 2 dial indicators. I use a 1 inch to check the longitudinal travel and another indicator for taper per inch. It is absolutely crucial that your cutting tool is on centerline. If you have a digital readout its even easier. Also, when you indicate an existing shaft, The indicator must be on centerline. Using a sine bar is probably the easiest and most accurate way.

 

[rmack898]

I finally did get around to making this shaft again. I don't have a DRO on my lathe so I used a dial indicator on a mighty mag base to set the length of carriage travel and then uses the same indicator to set my compound angle. The taper was right on the money and the mating taper socket fit nice and tight. Thanks to all for the help, I took good notes so that the next time I have a job like this it should be a breeze.

The tapered shaft was to mate a centrifugal clutch to a diesel engine flywheel.

 

[kd4gij]

Glad you got it done. Your print didn't use the standerd format for calling out a taper. Typicaley it will give the taper{ 1 in 16, 1 in 12, 1 in 10. } aad th diameter of the small end of the taper. The small end should be atlest 1/8" from the face of it's mate for draw. I always use eather the dro or indicator to set the angle

 

[machinistmarty]

Congrats, Well done!