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This page is long overdue. Several times a month, I receive emails inquiring about how to fix various common mini-lathe problems. I don't have much time to work on the page right now, but I wanted at least to provide a few comments and some links.
Some resources every mini-lathe owner should be aware of:
Particularly on models of the mini-lathe made before 2005, problems with the motor speed controller are one of the most common areas of trouble. LMS has created a great troubleshooting guide for controller and motor problems.
Usually, one of three components is responsible:
MOSFETs are transistor-like components that act as high speed switches to regulate how much of the AC waveform is applied to the motor, thus regulating the speed. One or both of the MOSFETS sometimes fail with the following symptoms:
Fortunately, if you have basic soldering skills, this problem is easy and inexpensive to fix. Replacement MOSFETS are available from LittleMachineShop.com as well as various Internet electronic component sellers for about $5 each.
Don't want to fix it yourself? As of April, 2012, Pete Brush provides a repair service for the speed control circuit boards.
I don't have time at the moment to write this section. However, if you check out other areas of mini-lathe.com, you may find information that will help you to solve your problem. See the Tuning section, for example.
Mini-Lathe Mini-Mill Bandsaw Grinder Anodizing Lapping Links Projects Resources Safety Premium Content
Mini-lathe: Accessories Adjustments Capabilities Chucks Dial Indicators Features Getting Started Glossary Introduction Materials Modifications My Shop Operation Reviews Sieg Factory Tool Grinding Troubleshooting Tuning Versions