Morse taper Jacobs chuck slips in tailstock

[llucas]

Ok, so everyday I learn something new...usually by watching something go slightly wrong. This time it is the Morse taper Jacobs chuck slipping in the tailstock when I use it to drill out the center of a hollow form prior to turning the inside. The slipping is where the taper fits inside the tailstock, not where the arbor meets the chuck. Light pressure = no problem, medium pressure = slippage. I can retard/delay the slippage by grabbing and holding the chuck tight, but eventually my grip will give way to the physics of the lathe. I slow the lathe way down to way less than 100 rpm.
Is this slippage part of the technique, am I just advancing the tailstock too fast?
Suggestions please.:dontknow:

 

[CaptnA]

I'd lower the speed of the lathe, and use light pressure. Make sure the inside of the taper and the taper are both clean (wipe with a paper towel and DNA for instance). It is a light friction fit calling for sort of a finesse operation.
Also make sure your bit is sharp. Amazing the difference even after a few pieces just a little honing can make.

 

[llucas]

Thanks for the reply...sounds like I am just a little impatient, and to the point, my bits are probably not the best. So I will tune up my technique, clean out the tailstock, sharpen the bits, ease off a little. It is comforting to know that once again patience and attention to details will pay off.
Thanks again.

 

[Gotcha6]

It may also help to give the taper a light sanding with some 400 or 600 grit wet or dry. It will increase the friction fit between the tailstock and the taper adapter. The DNA is to degrease it.

 

[striker]

I'd try lapping the tapers together. Working the tapers together with compound should work the high spots out and allow the taper lock up properly.

 

[llucas]

Now that I look closely at the taper, I do see some marring which might keep it from seating firmly in the tailstock...I suppose by compound, you mean the abrasive rubbing compound?

Thanks

 

[toolferone]

Do other tapers fit fine? Your chuck taper might be off a little. Also check the length. I once had to grind a taper a little shorter, because it bottomed out before it was fully seated.

 

[NCTurner]

You can also use the chuck key to stop the slipping, put the long end in the hole on the chuck and allow it to ride on the tool rest.

 

[llucas]

Gary
Genius/experience wins again.
That's a great idea!