Re: [CAD_CAM_EDM_DRO] Digest Number 450
Posted by
Andrew Werby
on 2000-04-12 09:56:32 UTC
"Ward M." <ward@...> wrote:
Subject: Re: Rotary to linear translation - an interesting idea.
Jon,
Yes, the roller/rod idea sounds like it has real possibilities. I believe
that McMaster-Carr has hardened and ground rod available in the required
lengths. Drill rod would probably work for shorter lengths. Anti-backlash
precision gears are fairly easy to get and the resolution increase would be
really helpful and just nice to have.
Ward M.
[The quest for adjustability in a setup like this might be made easier if
one used a conical rubber wheel on the encoder to contact the rod surface.
The effective diameter of the wheel would change if the encoder assembly
was moved in and out on adjustment screws, perpendicular to the rod.
Potter's wheel designs sometimes use a similar technique to achieve
variable speed with a fixed-speed motor. I'm not sure if small conical
wheels can be sourced, but they could be made by running a conical tool
into a piece of aluminum, filling it with adhesive RTV (release the hole
with soap), then letting it set up with a shank set in the drill press
which bottomed out in the point of the hole. Lapidaries use a variation on
this method to make diamond-filled epoxy points.]
Andrew Werby
http://www.computersculpture.com
Andrew Werby - United Artworks
Sculpture, Jewelry, and Other Art Stuff
http://unitedartworks.com
Subject: Re: Rotary to linear translation - an interesting idea.
Jon,
Yes, the roller/rod idea sounds like it has real possibilities. I believe
that McMaster-Carr has hardened and ground rod available in the required
lengths. Drill rod would probably work for shorter lengths. Anti-backlash
precision gears are fairly easy to get and the resolution increase would be
really helpful and just nice to have.
Ward M.
[The quest for adjustability in a setup like this might be made easier if
one used a conical rubber wheel on the encoder to contact the rod surface.
The effective diameter of the wheel would change if the encoder assembly
was moved in and out on adjustment screws, perpendicular to the rod.
Potter's wheel designs sometimes use a similar technique to achieve
variable speed with a fixed-speed motor. I'm not sure if small conical
wheels can be sourced, but they could be made by running a conical tool
into a piece of aluminum, filling it with adhesive RTV (release the hole
with soap), then letting it set up with a shank set in the drill press
which bottomed out in the point of the hole. Lapidaries use a variation on
this method to make diamond-filled epoxy points.]
Andrew Werby
http://www.computersculpture.com
Andrew Werby - United Artworks
Sculpture, Jewelry, and Other Art Stuff
http://unitedartworks.com