![]() If, when taking a cut, you are not happy with the finish, you'd want to change the ratio. Try combinations with the gears you have at your disposal to see if you can live with the feed that results from changing. For that matter, if you're happy with the finish, now, no need to do anything. Unless you have a full complement of gears, you most likely will be unable to create thread pitches you may wish to create. If you foresee cutting threads in your future, and you don't have plans on upgrading to a different machine, it would pay to try to procure all of the gears required to do so.Īssuming you make a decision to upgrade, consider buying a lathe with a quick change gear box, so you can simply dial the feed rates and thread pitches you wish to machine. This first of a three part series on cutting an internal thread on the Atlas lathe, covers setting up the change gears to cut a twelve pitch thread. Having that capability makes life much easier, and projects go much faster. I discuss how to read the chart and to properly set the backlash in the gears. You may already know that a lathe is a multifunctional machine for boring, milling, cutting, drilling, and turning. Sorry there is not enough information here to help.ġ) Identify the number of teeth on the spindle gear. With the aid of some methods, you can efficiently perform the aforementioned operations. ![]() Among all these operations, turning is the simplest one. Workers do it to minimize the width of the cylindrical bar. There may be 2, a 20 tooth or a 32 tooth, or whatever you have.Ģ) Identify which gear is engages with the spindle gearģ) Identify which gear is meshing with the gear that is meshing with the spindle gear.Ĥ) Identify which gear is on the lead screw. ![]() Let us ASSUME that the gear on the spindle has 20 teeth and from what you have given:ġ) the 20 tooth meshes with the 54 tooth and the ratio is 20/54 or. ( 1 turn of the spindle turns the 54 tooth gear. 37 revolutions.)Ģ) the 24 tooth gear attached to the 54 tooth gear in 1) above is meshed with the 64 tooth gear and the ratio is 24/64 or. 375 (1 turn of the 54 tooth gear turns the 64 tooth gear. Consequently 1 turn of the spindle will then turn the 64 tooth gear. )ģ) the 24 tooth gear attached to the 64 tooth gear is meshed with the 64 tooth gear on the lead screw and the ratio is 24/64 or. (1 turn of the 24 tooth gear turns the lead screw gear. 375 revolutions.)Ĥ) At this point the gear train from the spindle to the lead screw has a ratio of. This means that for every revolution of the spindle, the lead screw turns. 052 revolutions.ĥ) if we ASSUME that the lead screw is 8 threads per inch then the pitch is 1/8 or. This means that for every turn of the lead screw the carriage advances. Found a web reference to this but few details. 125 inches.Ħ) putting this all together, from point 4 above, for every turn of the spindle the lead screw turns. As best I can determine, this attachment was an accessory for an Atlas milling attachment (for, I expect, an Atlas lathe) however, it was never manufactured. Instead, the plans (blueprints) were offered. 052 revolutions and the carriage will advance. 0065inĪ bit complicated but if you keep things straight on a chunk of paper then one can calculate carriage advance from the spindle revs with any gear combination. Important to note that the gears not in direct mesh should not hit any other gears (gear clashing).
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