 | | Help needed on gear spacing, and another question
|
|
Hi all, I have two requests; any help would be appreciated. First question: what is the proper spacing to use when using a worm gear to drive a rack gear? I have (supposing studs up) a horizontal axle with a standard worm gear (4716) on the axle. I (...) (15 years ago, 3-Apr-09, to lugnet.technic)
|
| |
| | Re: Help needed on gear spacing, and another question
|
|
(...) Technic worm gears are not really made to mesh with the 1x4 racks. The problem is that the racks do not have any pitch (the gear teeth are perpendicular to the longitudinal axis of the rack). The worm gear, by definition, does have a pitch. In (...) (15 years ago, 3-Apr-09, to lugnet.technic, FTX)
|
| |
| | Re: Help needed on gear spacing, and another question
|
|
(...) Rafe, Must the worm gear mesh directly with the gear rack? Or, could you put a 24tooth gear in between? (worm->24->rack) Steve (15 years ago, 3-Apr-09, to lugnet.technic)
|
| |
| | Re: Help needed on gear spacing, and another question
|
|
(...) Try this inversion trick: (URL) (15 years ago, 3-Apr-09, to lugnet.technic)
|
| |
| | Re: Help needed on gear spacing, and another question
|
|
(...) Although not by far as nice and compact as Mike's suggestion I stumbled upon the following solution after a bit of tinkering: (URL) (15 years ago, 3-Apr-09, to lugnet.technic)
|
| |
| | Re: Help needed on gear spacing, and another question
|
|
(...) For instance, have a "floating" worm-gear-based gearbox sliding along that axle, with the 8t gears engaging an external stationary rack? If the worm gear doesn't have very far to travel, you could also substitute a rack gear or two for a (...) (15 years ago, 3-Apr-09, to lugnet.technic)
|
| |
| | Re: Help needed on gear spacing, and another question
|
|
First (zeroth?), thanks to all the information and helpful hints. I should have realized that the worm gear doesn't fit with the rack, as their pitches won't match up. That's really obvious and I should have seen that. Second, the worm -> gear -> (...) (15 years ago, 6-Apr-09, to lugnet.robotics)
|
| |
| | Re: Help needed on gear spacing, and another question
|
|
While the worm and 1x4 rack pitch are not the same and they do not mesh perfectly, it is still possible to make them work together in a reliable way. You may see one example below, (URL) Originally posted at TechnicBRICKs (URL) (15 years ago, 7-Apr-09, to lugnet.technic, FTX)
|
| |
| | Re: Help needed on gear spacing, and another question
|
|
(...) Is it just me, or do those worm gears look like the haven't been aligned properly? (15 years ago, 8-Apr-09, to lugnet.technic, FTX)
|
| |
| | Re: Help needed on gear spacing, and another question
|
|
(...) No! They're properly aligned. ;) They just look like that, because the way the worm termination is done. However the screw works continuous and smoothly. (15 years ago, 8-Apr-09, to lugnet.technic, FTX)
|
