Our shop's excello style 602 mill has a problem that I need some help solving. We bought the machine recently and just got it hooked up electrical-wise and started working with it. We noticed that the quill spring was broken and when we opened up the housing the spring was missing. We took out the hub and got another spring from excello. When we went to install the new spring, we noticed that the 3/16" hardened dowel pin that the end of the spring normally hooks around is completely sheared off. The hole is not a through hole (it would go into the quill area) but we were able to push the remains of the pin into the back of the hole. We tried using an extractor set but the hardened steel is hardly dented by the drill bit. There is about 5/16" of open hole that we can insert a new pin. We milled some slots into the cover plate to hold the spring so permanence isn't an issue. Here are our questions:
- Is there a drill bit that can drill this hardened pin to use an extractor to pull it out and insert a new pin?
- Failing removing the pin, what kind of temporary replacement would hold the load of the very powerful spring. We only need it for a few minutes but this an issue where personal safety could be in danger. We were considering a roll pin or even the shaft of a 3/16" drill bit cut to the right size.
- Has anyone had this problem before, more the removing a hardened pin issue rather than the quill spring issue?
Thanks in advance, woodworker88 Los Altos High School Robotics Team Los Altos, CA