Groove on a Taper

[carryinwood]

Hi.

I'd like to make an Arbor for a Sanding Drum I have.  It has an .125  dia hole in the middle,  I plan on using .25 dia Material,question is how would I Groove or Thread the portion from the .125 to the .25 dia  I made one with just straight Grooves on the Tapered section and the Drum just spins. Im thinking if I thread it or groove it.  It would draw it on to the larger dia.  What type of Path would I use?   ....25 dia rod,    tapered  section is .5 long  tapers down to .125 dia.  I'd  compare it to a Sheet Metal Screw type of thread. 

Thanks for any thoughts.

[RLeuschen]

If your doing this in a lathe, I would use the threading cycle, select NPT type of thread, change the major diameter to .250 and minor to what ever depth of thread you'd like, set the number of threads/inch , and set angle to 7.125 degrees at a z ending depth of -.5.

Depending on how deep you want the thread, you can adjust the major/minor diameters..

Hope that helps some,

Rob

 

[carryinwood]

Very Good Thanks......looks like what I needed..