The Woodshop Shed

A box with a threaded top

Furnished content.
(from WoodNet.net)


Just to learn how, I decided
to try threading on my 3 axis CNC. VCarve Pro has a toolpath for doing that, so
why not? First, however, you need to have a threadingbit. I bought this one:


It wasn't clear at first how to mill the
threads so that the tip diameter of one thread would mesh with the root diameter
of the other, allowing some slop factor. I think that would work had I milled
the threads to give a land on them, like an acme thread, but I made V-shaped
threads and for that to mesh I had to make the male thread one thread depth
larger before cutting the thread. I'm going to cut some threads with lands on
them to see if the logic is more straight forward. In any case, I was successful
and the threads mate very smoothly.




The box is about 4" OD, with a
UTS 1" thread I had to make the lid as two pieces, otherwise the threading bit
won't cut deep enough. The thread wasn't cut quite completely on the threaded
section, so it wouldn't fit down tight to the base, so I added the O-ring to
take up the slack. Still learning.

/>




class="mycode_font">Normally, the lid has a female thread and fits over the male
thread of the box. To do that, however, a back cut needs to be made below the
thread for clearance, again because the shape of the tool doesn't allow it
thread to the bottom of the recess. I managed to figure that out, too, but I
need a narrow T-shaped bit before making more.


And that kept my brain engaged
for a couple of days.

class="mycode_size">John

Read more here

0 comment(s)