powered linear travel with switches

[antokid1771]

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Hi, i am a new member from Ireland, this is my 1st post so hello everyone. I am trying to automate a prototype i am designing for industry so thought i could find some help here. Thanks in advance.

I need to achieve the following, please let me know if this is achievable with lego technic.

Once a switch is made a motor will then start and travel a set linear distance of between 20-300mm then return and stop. The motor would likely need to be clutched in case of any resistance, the motor speed would also need to be variable. I have seen rack and pinion which looks the best option, the switches, motor, gearing, power supply involved i`m not sure about.

I  am very new to technic so forgive me for being a novice.

thanks

 

[Coder Shah]

Not really sure what you're looking for but perhaps this will be useful.

https://jkbrickworks.com/telegraph-machine-and-printer/

 

[Lok24]

Hi,

yes, that's all no problem, and you mentioned the most important things:
rack, pinion, clutch.

Here it is, without clutch!
I built that as as small demonstration some months ago.

 

 

But where ist the clutch (that I formerly used in all my models)?

It's in the software. Set the motor to max power (not speed!)  say about 20% and start it, let in run as long it returns back his speed(!).
On the end, two things happen: Power cannot increase due the motor stalled, an motor as a sensor returns a speed of 0, then the programm stops the motor.

And here you see it with a mechanical clutch (the white gear on the left motor at 0:40)

 

But you need any program running....

Do have some programmable parts?
Is it acceptable to have a smartdevice or PC running the programming while model in use? Or should it be "standalone"?

 

 

Edited May 15, 2020 by Lok24