Posted by Janicholson on November 13, 2021 at 10:02:29 from (24.240.46.228):
In Reply to: Re: OT Bridgeports posted by Dave H (MI) on November 13, 2021 at 09:38:49:
Variable speeds on these (and other machine tools are exactly like the transmission in snow mobiles. There are two pulleys and a belt. Both are large 8 inch or so in diameter, and split so that they can change width (axially). One pulley is spring loaded towards pinched together, making the belt run on its outer diameter. The other pulley width is controlled by a throwout bearing like arrangement that uses a screw and crank to adjust the width mechanically. The belt is sized to be 1/2 way up the diameter of both pulleys when the speed ratio is 1:1. The crank is turned to set the speed by making the width adjustment to suit the speed required within the range allowed by the pulley sizes. Speed reduction has the driven pulley big and the drive pulley small. if not running, the action causes the adjustable pulley to open up loosening the belt and possibly causing no drive. If adjusted the other way, it pinches the belt and can cause the pulley or mechanism to be under strain it was not designed for, possibly breaking it. I have 4 machines with this drive, and thousands of students have operated them none have broken. All have large signs dictating the procedure, and demos are given as to what and why. Jim
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