--- In mill_drill@y..., "Ken" <av8or@c...> wrote:
> Is it possible for you to provide more details on the construction
> bench. I am especially interested in the way you built the casters
> jacks on the corners.
Most of the construction of the bench is pretty basic. The main frame
is two 36x48 rectangles of 2" angle iron (one for the top, one about
3" up from the bottom of the legs). The legs are on the outside at
the corners and also 2" angle. There's an extra lenghtwise brace on
each side, mainly to stabilize the top of the jacks. There are angled
braces of 3/4" angle at several of the corners (visible in the pics).
There are two 3/4" angle braces across the top, under the plywood.
The top is two layers of 3/4" plywood laminated together and bolted
into the frame. This leaves a lip of ~3/8" around the edge of the top
so that things won't roll off and to collect coolant when I get a
system added. The whole thing is painted with garage floor epoxy
which is proving to be unbelievably durable.
The jacks are really simple. Pieces of two sizes of heavy wall
(~1/4") square tubing sized so that one slips inside the other. The
bottom part of the jack (inside piece of tubing) has a caster welded
to the bottom and a 1/2-13 nut welded to the top. The screws to
operate the jack are made from 1/2-13 allthread. I welded a nut on
the end, passed the screw through a piece of 1/4" plate cut to the
size of the larger tubing, and welded another nut onto the screw on
the other side of the plate. There are also washers between the plate
and the nuts. That way the screw is free to turn, but can't move up
and down. Then I welded those plates to the tops of the larger pieces
of tubing so that the screw extends down into the tube. The smaller
tubes were inserted in the larger and the screws threaded into the nut
s on the tops. I greased the screws thoroughly before final assembly
(after welding the jacks onto the table). They work remarkably well
and lift the table with the mill and lathe on it easily.
Hope this helps.