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Refurbishing Old Tool Holders
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Forum Responses
From contributor B: A small word of caution - refer to spindle maintenance guidelines. When cleaning spindles (tool holder mating surfaces) it’s usually a bad idea to use compressed air. From the original questioner: Thanks for the replies, the tool holders are new and are in great shape. However, the spindles have a significant amount of rust in them, where the taper of the tool holder would meet the spindle. What should I use to clean the spindles so I don’t damage them? From contributor C: If your spindle tapers have a significant amount of rust in them, your tool holders will not be in good shape for long. The rust is probably a type of corrosion that indicates movement between the holder and taper. Poor taper geometry or poor retention pressure will cause this problem initially, but even if the taper did not start out distorted, it will end up that way. The ideal fix is to have the spindle tapers hard chrome plated and reground. While the spindle is torn down, it is a good idea to replace the Belville washers that provide the drawbar retention pressure. If you are absolutely sure that your retention pressure is where it should be, you can have the tapers reground on the machine by any of several services. Bear in mind that retention pressure needs to be checked after regrinding since regrinding will shift the gage line and thus change the pressure. A good spindle rebuilder will be able to bring most router spindles back to new specifications and give you a warranty. Heian spindles in particular are quite robust and are usually good candidates for rebuild. Check out American Precision Spindles for rebuild work. If you opt for on site taper regrinds, they can also point you in the right direction. Would you like to add information to this article? Interested in writing or submitting an article? Have a question about this article? Have you reviewed the related Knowledge Base areas below? 
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