tag:blogger.com,1999:blog-2807403883562053852.post5993297378431037606..comments2024-03-27T08:40:31.785-06:00Comments on Clayton Cramer.: Another Machining Lesson LearnedClayton Cramerhttp://www.blogger.com/profile/03258083387204776812noreply@blogger.comBlogger1125tag:blogger.com,1999:blog-2807403883562053852.post-29628986306587838162016-11-25T14:30:08.319-07:002016-11-25T14:30:08.319-07:00Most of the typical knee mill types use some type ...Most of the typical knee mill types use some type of belt for the final drive of the head, which can slip if needed, I suppose. The Bridgeport has two different setups, depending on if variable adjustable or pulley change type. Neither is a toothed belt type connection.<br /><br />With the availability of VFD controllers, the pulley change type is no longer an also-ran in the desirability area. Less to wear out or break, and belts are cheaper, and the VFD gives you the speed control. Changing the pulley setup just gives you a different speed range to play with. IIRC, the VFD gives one the capability to spin them in the range of current CNC units (8-10k rpm), but the headstock bearings are the limiting factor. I don't know if they can be upgraded to handle that sort of load.<br /><br />The VFD was less than the price difference between the two Bridgeport versions, I think. I'm a bit out of date on my data on this subject.Willhttps://www.blogger.com/profile/00722792638246578812noreply@blogger.com