{"id":2720,"date":"2009-02-04T19:51:53","date_gmt":"2009-02-05T00:51:53","guid":{"rendered":"http:\/\/toolsofrenewal.com\/?p=2720"},"modified":"2009-02-04T20:09:58","modified_gmt":"2009-02-05T01:09:58","slug":"motor-anxiety","status":"publish","type":"post","link":"https:\/\/toolsofrenewal.com\/?p=2720","title":{"rendered":"Motor Anxiety"},"content":{"rendered":"

This is Why Engineers Shoot up Their Offices<\/em><\/p>\n

Once again, I am finding selecting tools harder than using them.<\/p>\n

I want to make a belt grinder. I read up and found out that the biggest motor I could conceivably need would be 2 horsepower, so that’s what I’m trying to buy. I want 3-phase, so I can use a VFD. I thought a 1750-RPM motor would be good, because it would run cooler and last longer. And I figured I’d get something like 2500 fpm on it, which would be sufficient.<\/p>\n

BUT WAIT!<\/p>\n

Turns out speeds of up to 5000 fpm can be useful. That rules out a 1750-RPM motor. I’d need an 11″ drive wheel. I think. Hope I didn’t make any careless errors. Now I’m looking for 3450-RPM motors, and good ones aren’t that easy to find.<\/p>\n

It gets worse. There is almost no hope that I will be able to find bearings that will work with a shaft bigger than 5\/8″. And a lot of 2 HP motors come with bigger shafts. If you can’t have mounted bearings on your shaft, you might as well kill yourself.<\/p>\n

So I have to put all these factors together. Now that I think about it, don’t I need a super-long shaft? Man, that didn’t even occur to me. It will have to go through two mounted bearings plus a thick drive wheel hub. Is there such a thing as a shaft extender for an electric motor?<\/p>\n

Excuse me while I breathe into a paper bag.<\/p>\n

More<\/strong><\/p>\n

I guess my brain was malfunctioning again. Apparently there is no reason why I can’t put a drive wheel directly on the motor shaft and stick the motor next to the frame. Other people don’t do this, because they have elaborate pulley systems to get around the lack of a VFD.<\/p>\n

Whew.<\/p>\n","protected":false},"excerpt":{"rendered":"

This is Why Engineers Shoot up Their Offices Once again, I am finding selecting tools harder than using them. I want to make a belt grinder. I read up and found out that the biggest motor I could conceivably need would be 2 horsepower, so that’s what I’m trying to buy. I want 3-phase, so […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[13],"tags":[],"class_list":["post-2720","post","type-post","status-publish","format-standard","hentry","category-tools"],"_links":{"self":[{"href":"https:\/\/toolsofrenewal.com\/index.php?rest_route=\/wp\/v2\/posts\/2720","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/toolsofrenewal.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/toolsofrenewal.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/toolsofrenewal.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/toolsofrenewal.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2720"}],"version-history":[{"count":0,"href":"https:\/\/toolsofrenewal.com\/index.php?rest_route=\/wp\/v2\/posts\/2720\/revisions"}],"wp:attachment":[{"href":"https:\/\/toolsofrenewal.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2720"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/toolsofrenewal.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2720"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/toolsofrenewal.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2720"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}