In this post I show the result of carrying a sequence of tests to the rebuild Wörner drilling press to check its accuracy. I took an Aciera 10 drilling machine inspection chart as a reference. Both machines are of similar size and Aciera quality is second to none.
One of my projects this summer was to finish the cabinet for the Wörner B13 drill press. The work mainly consisted of cladding the steel support frame with MDF. The ultimate goal was to prepare it for the electrical wiring and a set of drawers to organize the machine’s tooling.
This is the post that closes the mechanic works on the Wörner B13. Now remains to do some final testing, some woodworking to take profit of the supporting structure and to mount the electrical controls. These will be the next steps.
There are a couple of pictures of the finished machine:
This is how the drilling machine return spring looks when I opened the cover:
A previous owner did a not very successful repair and modified the internal attachment of the spring. As a result, spring was badly deformed and have a unusual feeling during the descent. I extracted it by pulling it out of the cup and then giving it a quarter turn to free the external end from its attachment (it has a rectangular shape as you will see next).
A look inside the drive train of this vintage Wörner drill press reveals a massive modification by a previous owner. To drastically reduce the rotation speeds, an extra intermediate pulley was spliced into the system, forcing a new single-step pulley onto the motor shaft. While it’s possible this was a custom factory job by Wörner, it’s far more likely a clever aftermarket hack. Either way, it’s coming off to make room for a more traditional setup.
The Wörner quill is again on the drilling press. After being completely cleaned and disassembled, the quill rack was touched up to correct the damage that probably was made while assembling the pinion some time ago. Main bearings were replaced by a new ones. Old ones have a suspicious mark that suggest they are no plain 6006 deep grove bearings. GMN redirected me to the spanish contact Berkomat and they concluded that class P4 6005 bearings would be the right replacement.
