You are getting a set of 2 custom machined brass gears
International customers – please read the shipping notice
below about shipping options
In the 1980s the Alps 4-pen printer/plotter mechanism was
used by almost every home computer manufacturer, for portable computer printers
as well as a number of pieces of medical equipment. While they were not fast,
they were compact, and did allow for 4 color printing/plotting at an affordable
price.
Over the years they all develop the same problem however,
the pinion gears on the stepper motors crack. Plastic shrinks over time and a small
plastic gear pressed onto a steel shaft will most likely succumb to age and
split. While there have been some 3D printed gears available, they are
expensive and not as strong as the original injection molded plastic gears.
After searching for a few years now we finally found a
manufacturer that could reproduce these gears in a reasonable quantity and
reasonable price and out of brass which will last a lifetime. Now it is
possible to fix all those old alps mechanisms and get them printing/plotting
again.
The gears are sold in a set of 2 which is enough for 1 printer/plotter
mechanism. They must be pressed into place, but you can make a simple tool to
do so form a 2”/50mm C-clamp.
Installation video: search for "alps mech brass gear" on YouTube, eBay will not allow a direct link.
International shipping notice – We are no longer able to ship very small packages as 'Airmail', the good news is that we are now able to use a international shipping consolidation service which is faster and more economical on small to medium weight shipments. For very small packages is is more than Airmail but less than eBay.