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  • schoolie 6:05 pm on February 7, 2014 Permalink | Reply
    Tags: , Evanut, , , , RF-45 Repair   

    RF-45 Repair – Making a new Y-Axis Nut 

    The most recent success in my ongoing RF-45 mill repair project is the fabrication of a new Y-Axis lead nut. The stock nut was apparently lost somewhere along the way during the attempted CNC conversion that I’m partially reversing, so I had to come up with a replacement.

    My first thought at replacing the nut was to make a new one out of acetal plastic based on the method described at the Home Shop Machinist Forum. On second thought, I decided it would be much more practical to see if I could find a replacement part online. Like many of the chinese machine tools out there, this mill is one of many clones of an original design. In this case, the Rong-Fu 45 is the original, and my copy was produced by Penn Tools. Unfortunately, I was unable to find replacement parts through them, but Grizzly sells a similar mill along with replacement parts. I dug through the manual to find the part number, contacted Grizzly, and ordered the nut. Easy enough right?

    Unfortunately, the importer of my mill chose to use 8 TPI leadscrews, while the Grizzly version uses 10 TPI leadscrews, so the nut didn’t work. I returned it to Grizzly, and set off on my original plan of making the nut from scratch.

    I started by boring and splitting the acetal to fit the lead screw:

    (Read the rest of this post…)

     
  • schoolie 11:02 pm on November 6, 2013 Permalink | Reply
    Tags: Machine Repair, , , , RF-45 Repair   

    RF-45 Repair – Reinforcing the bed 

    The RF-45 mill I purchased on craigslist a few months ago had some issues… In an attempt to convert the mill to CNC using an extremely oversized ballscrew, a previous owner had milled a pocket out of the bottom of the bed, leaving the material below the bottom of the center T slot uncomfortably thin. With the goal of restoring some of the bed’s original stiffness, I’ve fit a steel plate into the pocket. This post documents the process of machining the plate to fit the bed.

    Here’s the bed as it stood before adding the plate:

    View of bottom of bed showing material removed, and thin wall condition at bottom of T slot

    (Read the rest of this post…)

     
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