GearHeads Corner

Ok Guys, what am I doing wrong. attached is a file for a theoretical clock. according to my calculation, the HourShaft should rotate 1/60 RPM for every 4 RPM Gear Motor.

starting with the input 10 teeth and Output (Hour Gear) is 1/60 RPM the formula is for that gear train should be as follows (unless I missed something):

1/60= (input RPM) (10/50)x(10/60)x(10/80) this will yield to 4 RPM Input (unless I messed up something)

The simulation with the Timing Marks should show the motor turning 4 times and the Hourshaft (1/60) i.e. (one minute tick) but watching the simulation on the screen shows one to one ratio.

Also the
Any help would be greatly appreciated

Thank you all,
Robert

Hi Robert:

Lets see what we have. Well, the linkages seem all wrong. The driver is set as the wrong gear and various gears are linked backwards. Not sure how this happened, but not all is lost.

Heres what I did. First, start at the top of the project list. click on each gear, and shaft one at a time. Click remove link on every link on every gear. Many of them are wrong, so its easiest to simply relink them all.  Check each gear by clicking it in the tree and its linkage screen should show no links. This only takes a few seconds when you get used to it...

  Now, click on motor, then add linkage. Select spur8. you can also link to shaft 3- if you like. Doesnt matter as the shaft isnt used further. Now click on spur8, then add link and select "shaft".  Now click on "shaft" and select spur 9-2 as the link. Now click on that gear and select spur1 as the link. then link spur 1 to the shaft1, Shaft1 to  spur9-1, spur 9-1 to the hourgear.., hourgear to hour shaft. And Viola, you have a running geartrain from motor to hourhand.

  You can do the rest to complete, but stop at this point and click simulate. Notice the gears are now looking proper all the way to the hour shaft. Click the hourshaft, the ratio reports..

  Rots of master to 1 rot of this gear : 240.

  At 60hz, thats 4:1, as you suspected. I think at some point you may have deleted gears , then added more, but the linkage was set wrong. Do as above and youll see relinking a gear train is pretty easy, just follow it logically by the graphics, if a gear turns a gear, link them, if a gear turns a shaft which then turns a gear , then link gear to shaft and shaft to gear. etc.. follow the train as you see it should work, and it will. The graphics will resync as you correct  the linkages, so if you see graphic errors, double check as it may be showing you a mistake.

Thx
Art



Art

Art,

Thank you so much for your prompt respond, that will be my task when I get home tonight!!!

As far as how it happened, ( IT WASN'T MY FAULT) AND ( I ADMIT NOTHING) ....

Stay tuned


Thank you,
Robert

Robert:

  lol, no problem, I always assume the program did it, even when fingerprint analysis shows otherwise.. :)

Art

Thanks.....it worked....

I moved a couple of gears around and now the teeth don't mesh correctly but the RPM ratio is spot on...

Thank you,
Robert

Hi Robert:

Sometimes you can correct the mesh by using the rotation adjust on various gears, but then of course it doesnt much matter if the sim is off, so long as you konw it will mesh when built. :)

Thx, good luck,
Art