Table of X and Y motions 

I saw the preview picture and wanted to make a comment " Now that is unique!". You beat me to it 😂

no

It would be unstable except for the frame and linear rods constraining the motion.

Please refer to: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-WeV89YavvO8.html Use the pink sector to prevent the orange pawl from the contact with the green ratchet wheel.

I have the following (not calculated): ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-7bVTvWGAdAA.html ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-WZHfFLtYCpg.html ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-ZESjsMQKmIs.html

If the gear teeth are sufficiently wide, they’ll always be engaged with at least two table teeth. Moreover, the gear teeth don’t need to be fully seated between two table teeth to function, like you’d expect with a cam and follower. The point of contact is always going to be very narrow. As long as it’s manufactured to a tight enough tolerance, there’s no reason it couldn’t work as depicted.

@@luke_fabis the wider the gear teeth, the more interference there would be, it would have to move in a zigzag in real life application, and that would stress the motors too much

@@mrpoopybutt Interference implies a stoppage of motion. A longer gear tooth may increase friction, but that doesn’t necessarily equate to interference. Actually, quite the opposite, so long as you can overcome friction, a longer gear tooth would better stay aligned with the table teeth. With the right material and precise machining, the teeth could probably work just fine as a bearing surface when sliding. Also note that I wrote sufficiently long. Obviously there needs to be a balance, and a gear tooth that’s too long won’t be practical. But if a gear tooth is too short, it can snag as it travels across table teeth. You need to make sure it’s spread across several teeth to stay properly constrained.

@@luke_fabis yes but for the table to move without the extra friction, one gear would have to stop moving for the other to make its pass and it would go back and forth. In a practical sense, this woyldnt work for something that needs a fluid motion

@@mrpoopybutt Friction is going to be unavoidable, but if the gears are aligned and meshed perfectly, and if the whole assembly is rigid enough, there shouldn’t be a significant effect like you’re describing. If anything, it would wear a little more evenly if it’s constantly doing simultaneous X and Y moves. This is definitely not something that could be achieved on someone’s home FDM printer, but there’s nothing inherently infeasible about this design.

Thank you for the link.

Nothing special. It's a square rack. Its teeth are generated when cutting the tooth grooves from the two adjacent sides. A video showing how to cut the teeth for ordinary rack: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-83NMoghPN-A.html

@@thang010146 i am going to try your rookie bogie in little bigger size using hub motors sir. I shall get back once I start the work

A little more complicated than this one: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-83NMoghPN-A.html

Presumably it'd be made with POM so it wasn't an 8 hour job.

perfect job for a shaper, I can try to make one when I have some spare time :) can test on POM

I would love to get a shaper, its such a cool tool!

@@EnUsUserScreenname it is lovely to watch :D, only reason I have it is because it is cool :D

it wouldnt because the plate is mounted along the outer rails, meaning that the gears dont have to touch the bottom of the plate when sliding

Pyramids are better because the contact with the gears is linear while cones give the point contact.

It's a square rack. Its teeth are generated when cutting the tooth grooves from the two adjacent sides. A video showing how to cut the teeth for ordinary rack: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-83NMoghPN-A.html

Please investigate the last scene of the video. The two gears always engaged with the bidirectional rack.

ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-83NMoghPN-A.html It's a square rack. Its teeth must be cut along both directions.

Please refer to the followings: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-c3bjt_8CdKw.html ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-1jCMqx1BJu8.html