insde taper setup

[richard.nott]

wanting to cut an inside 10* taper for a 5-C collet adapter but can't get it through my thick head how to do it. would appreciate a boot in the right direction to get going. would like to know if there are any video clips available anywhere to watch also. thanks for the help Richard

 

[MachineTom]

Richard, set the compound at 10° and thats it. lock the carriage, cut with compound handle, doc with the crosslide feed.


To check your work, take a collet say 1/2", put a dowel or accurate sized piece in the collet, blue up the angle bore, and tighten the drawbar, then check the transfer of the blueing.

 

[kvom]

Another way to check is to attach an indicator to the compound, put a collet in the lathe chuck, and then trace the tapered section adjusting until the needle doesn't move. To help set the compound, mount a square in a tool holder and adjust so that it's parallel to the collet taper.

 

[rodw]

Tom Lipton at Oxtoolco on youtube has just done a 4 part video series on tapers. http://www.youtube.com/user/oxtoolco

I spent a bit of time yesterday trying his sine bar technique to set the compound angle. It was hard! After a bit more research, today I made a bracket that sits on the compound to hold the sine bar and now I just sandwich the sine bar between the compound and the tailstock barrel. After setting, it indicated within 0.0004" (0.01mm) along the compound length! I was very happy as I was not sure if I could machine the bracket accurately enough.

Can't wait to try it out!

 

[bb218]

I would try to get the angle a close as possible but I don't think it will matter a great deal if you miss it by a degree either way. All it does is tighten the collet and insure the collet runs concentric with the spindle. I would rather the contact be made at the large diameter of the collet and not the small diameter.
To get the angle a close a possible be SURE you have your boring bar set at the correct center height. This is extremly important when turning tapers. Mike

 

[richard.nott]

went to the shop this morning about 6:30 and after a couple hours of back and forth figured it out. finally figured out how to set the tool bit and compound and got a smooth finish that required little polishing. thanks for all the help
Richard

 

[rodw]

Now I have taken photos, this is what I meant.
http://www.homemodelenginemachinist.com/showthread.php?t=23268

Great to hear you got it done.