25 x 37 Dual Leadscrew Table


25x37 Machine

These plans are no longer available.
The 25 x 25 is similar but simpler.

This machine was well received because of its lean and innovative design.

Its sales dropped with the introduction of the later machines. The costs associated with offering the plans for this machine were greater than its income, and the plans were discontinued.
 
This machine has been replaced with the 25x25 and 24x48 for a number of reasons as explained below.

This 25x37 was designed around hardware store threaded rod, rather than Acme rod. This kept the price low, but made upgrading challenging, since clearances were tight for the larger Acme rod.

This 25x37 machine was dimensioned with no consideration for the stock sizes of leadscrews. The hardware store rod was so inexpensive that waste was not a concern.

Acme can be costly, and buying standard 6ft lengths for the just over 3ft sections, which were required for this 25x37 machine, left a lot of expensive stock in the scrap bin.
The 25x25 was designed to fully use standard 3ft leadscrews with no waste. The 25x25 and 24x48 can be lengthened if desired.

The leadnut system in this 25x37 used rod couplers, which are not easily upgraded to Acme leadnuts because of the completely different connection systems.

The quality of rod couplers offered by home centers has decreased significantly, and the newer thin walled sloppily tapped ones do not work well as leadnuts.

The 25x25 and 24x48 were designed to use a variety of Acme leadscrews and leadnuts as well as hardware store threaded rods with tee nuts.
 
The aluminum channel used for the rail cradles, though once off the shelf in some regions, was unavailable nationally and globally, so it was designed out of the system for the newer machines.

The 25x37 used EMT conduit for the rails. This was upgraded to stiffer and heavier pipe for the 25x25 and 24x48.

The gantry beam was upgraded from the 2x4 used in the 25x37 to 2x6 stock for the 25x25 and 24x48. This added rigidity to both the gantry and the new taller carriage.
The carriages for the newer machines use thicker stock or aluminum rather than the 1/4 inch hardboard that was used in the 25x37. This also added rigidity to the system.

The stepper and belt assembly were moved to the back of the 25x25 and 24x48 machines, which opened the front to give easier access to the table bed.

The 25x37 was a handsome machine, which received good reviews, but it is not as robust as its replacements.