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| Gear calculation help please |
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| Chuck in E. TN:
I am making a custom fine feed banjo for my 7x14 lathe. I have 20 and 80 tooth gears, from a laser printer, that are the same mod as the 7x change gears that I want to use. Is there a formula to calculate the center to center distance of meshed spur gears? I would like to lay out the holes for the gear axels without having to allow for adjustment for tooth mesh, making the attachment of the banjo via a clamp on the lead screw bushing. Chuck |
| tom osselton:
I would mesh them together and measure the inside of the shaft's then add 1/2 of both shaft's diameter should give the center to center distance. |
| Pete.:
If you know the pitch circle diameter of your two gears the centers will be half the sum of their PCD's, plus whatever you allow for clearance. |
| John Stevenson:
Chuck. 50mm answered over on HSM. |
| Chuck in E. TN:
John, I often post the same question to several forums. I get way more info, most of it good. Got 3 good websites and 1 good shop calculator program, all of which reinforced what I knew and what others provided. Habit I guess, as I have friends all over the internet and no one close that shares the same interests. I gratefully thank all that relied. Chuck |
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