{"id":189,"date":"2008-09-20T15:56:00","date_gmt":"2008-09-20T15:56:00","guid":{"rendered":"http:\/\/www.bolis.com\/testwp\/story\/baldor-grinder-restoration\/"},"modified":"2016-12-11T19:34:18","modified_gmt":"2016-12-11T19:34:18","slug":"baldor-grinder-restoration","status":"publish","type":"post","link":"http:\/\/www.bolis.com\/amillar\/baldor-grinder-restoration\/","title":{"rendered":"Baldor Grinder Restoration"},"content":{"rendered":"
\"Grinder
Grinder restored<\/figcaption><\/figure>\n

I received a Baldor metal grinder with 10-inch wheels, on its own pedestal floor stand, discarded from a school metal shop program. Several owners before me did not know what to do with it, mainly because the motor is wired for three-phase industrial power which is not found in U.S. residential homes. My job was to fix it up and get it working.<\/p>\n

There were two major tasks to the restoration: cleaning\/repainting, and making the three-phase motor work.<\/p>\n

Cleaning and Painting<\/h3>\n

I started the cleaning process by removing all attachments that I could, including the wheel shroud side covers, the wheels themselves, and all electrical boxes and covers. I remove all of the old flaking paint and minor rust spots using a wire wheel brush on the electric drill. Some of the paint was still good, but much of it was stripped down to the bare metal. I could not remove the riveted-on motor label and didn’t want to paint the wheel axles, so I covered them with masking tape.<\/p>\n

I spray painted the entire grinder and all the separate parts with primer for a good base coat. I followed it with a few coats of grey paint.<\/p>\n

\"Stripping
Stripping paint and rust<\/figcaption><\/figure>\n
\"Priming
Priming parts<\/figcaption><\/figure>\n
\"Painting
Painting parts<\/figcaption><\/figure>\n
\"Priming
Priming body<\/figcaption><\/figure>\n
\"Painting
Painting body<\/figcaption><\/figure>\n


\n<\/a><\/p>\n

\"Polishing
Polishing hardware<\/figcaption><\/figure>\n

I cleaned up the hardware to make it look a little nicer. I filed and sanded the heads of the screws and bolts while spinning them in the drill press. I buffed all of them with a cloth wheel, which made them nice and shiny. I finished it with some clear spray varnish.<\/p>\n

I reassembled all the pieces, back in the order they came off.<\/p>\n

\"Painted
Painted well<\/figcaption><\/figure>\n
\"wheel
wheel reinstalled<\/figcaption><\/figure>\n
\"Shiny
Shiny screws<\/figcaption><\/figure>\n


\n<\/a><\/p>\n

Electrical<\/h3>\n

Originally this grinder was hard-wired to the wall using “BX”-style flex conduit. There was a power relay and circuit breaker box, which engaged and disconnected all three phases in sync, using start and stop push buttons.<\/p>\n

For the 3-phase power, I built a
\nstatic phase converter using capacitors.<\/p>\n

I rewired the relay box to supply single phase power to the phase converter. I attached it to the pedestal stand of the grinder. I drilled holes in the pedestal and tapped screw threads into them, and screwed the relay box in place. Instead of flex conduit for the power line, I added a standard power cord. Since it uses 240 volts, double the US standard, I used a different plug and outlet.<\/p>\n

The phase converter needs an extra momentary push button to start the motor, so I added that to the front of the grinder next to the main on-off switch.<\/p>\n

\"Tapping
Tapping holes<\/figcaption><\/figure>\n
\"Switch
Switch boxes<\/figcaption><\/figure>\n
\"Converter
Converter and relay boxes<\/figcaption><\/figure>\n
\"Relay\"
Relay<\/figcaption><\/figure>\n
\"Power
Power to relay<\/figcaption><\/figure>\n
\"Start
Start button<\/figcaption><\/figure>\n
\"Converter
Converter in box<\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"

I received a Baldor metal grinder with 10-inch wheels, on its own pedestal floor stand, discarded from a school metal shop program. Several owners before me did not know what to do with it, mainly because the motor is wired for three-phase industrial power which is not found in U.S. residential homes. My job was … Continue reading “Baldor Grinder Restoration”<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[2],"tags":[11,26,3,4],"class_list":["post-189","post","type-post","status-publish","format-standard","hentry","category-project","tag-electrical","tag-grinder","tag-tools","tag-workshop"],"acf":[],"_links":{"self":[{"href":"http:\/\/www.bolis.com\/amillar\/wp-json\/wp\/v2\/posts\/189","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.bolis.com\/amillar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.bolis.com\/amillar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.bolis.com\/amillar\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/www.bolis.com\/amillar\/wp-json\/wp\/v2\/comments?post=189"}],"version-history":[{"count":8,"href":"http:\/\/www.bolis.com\/amillar\/wp-json\/wp\/v2\/posts\/189\/revisions"}],"predecessor-version":[{"id":357,"href":"http:\/\/www.bolis.com\/amillar\/wp-json\/wp\/v2\/posts\/189\/revisions\/357"}],"wp:attachment":[{"href":"http:\/\/www.bolis.com\/amillar\/wp-json\/wp\/v2\/media?parent=189"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.bolis.com\/amillar\/wp-json\/wp\/v2\/categories?post=189"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.bolis.com\/amillar\/wp-json\/wp\/v2\/tags?post=189"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}