marcusb Posted July 8, 2013 Share Posted July 8, 2013 Im repowering a mid sized camel back drill press. I was setup for 3 phase so I setup the single phase motor at the same rpm and its much to fast. Can anyone give me an idea how fast the pulley shaft should spin? thanks marcus Quote Link to comment Share on other sites More sharing options...
swedefiddle Posted July 9, 2013 Share Posted July 9, 2013 Some people add another motor as an idler, then you can gear the speeds down. Move your motor to the side (add a bracket), mount an old motor in the original motor position, connect motor to idler, idler to drill press. Speeds can go up or down whichever way you connect the belts. Just another way of skinnin' the kat!! :) :) Neil Quote Link to comment Share on other sites More sharing options...
Rich Hale Posted July 9, 2013 Share Posted July 9, 2013 Drill spindles are set by surface feet per minute of the drill used, find that out then adjust spindle speed to match, Quote Link to comment Share on other sites More sharing options...
mike-hr Posted July 10, 2013 Share Posted July 10, 2013 Does the drill press have four step pulleys to adjust the spindle speed, like an old South Bend lathe? If so, I would set up the driver so the final spindle was turning about 60 rpm for large bits, up to 220 or so for small bits. The 'machinerys handbook' has formulii for driving and driven pulley diameters. Quote Link to comment Share on other sites More sharing options...
Dave Hammer Posted July 10, 2013 Share Posted July 10, 2013 Click on this.... http://www.bing.com/images/search?q=drill+sfm+chart&id=48786EF6A85182E2E673D8C5244678A3098B861B&FORM=IQFRBA#view=detail&id=3C726C517045F2D2E32B5525C10B4372E8DA7AE3&selectedIndex=1 Quote Link to comment Share on other sites More sharing options...
mike-hr Posted July 10, 2013 Share Posted July 10, 2013 Thanks, Dave. I'm printing that out to hang on my wall. I would like to state as an addendum, that an old drill press should reduce those speeds by 25% or so, because of babbit bearings chatter more than milling machine bearings. I've been machining with old equipment since 1985, what works for me, is, if the chips start turning blue right off the drill bit, slow it down until they turn brown, then turn blue when they hit the air. Quote Link to comment Share on other sites More sharing options...
marcusb Posted July 10, 2013 Author Share Posted July 10, 2013 Thanks for all the tips guys, I really appreciate it. Sounds like i need to do some calculations Heres a pic, shows how its setup. currently driven shaft turns around 700 rpm Quote Link to comment Share on other sites More sharing options...
David Gaddis Posted July 10, 2013 Share Posted July 10, 2013 My initial calculation of what I see should be about 78 rpm carry on Quote Link to comment Share on other sites More sharing options...
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