July 15, 2018 at 6:48 pm #63824
I could use your help. I am wanting to use a standard Nema 17 stepper 76 oz/in torque (or two) to use as openers on my garage windows. I was thinking of mounting the motors on the top of the frame and using a standard lead screw and attach the nut to the lower sash. If I were to use the 300mm LeadScrew and Nut T8 4 start 2mm pitch 8mm/Rev. from your store, how much lifting force would I have?
I know this seems like I am being lazy (well maybe a little) but I screwed up my neck a few years ago and reaching over my bench to open my windows to get a breeze in the garage is a real pain in the neck 🙂
If all else fails I can just buy a linear actuator….but that is not nearly as much fun as DIY projects.
CurtJuly 15, 2018 at 8:28 pm #63835
I’m not Ryan (and a poor substitute, especially when it comes to mechanical stuff), but the leadacrew has enough torque to lift the MPCNC. At least the 5/16″ ones did. The T8 isn’t as big of a ratio.
The trouble is that leadscrews won’t work at even the slightest angle. They bind really fast.
If you’re not in a hurry, I would think getting a DC motor with a big (1:32) ratio gear and attaching a cable would be a great solution. Steppers also need drivers, and software to drive them. A DC motor could be attached through a switch directly to a power supply. Switch one way, up. Switch the other way, down. That big ratio would be slow, but it would be super tough.July 15, 2018 at 8:43 pm #63836
Agreed Steppers over complicate something like that. Drop in a few limit switches and it could be nice and easy.
1 user thanked author for this post.July 16, 2018 at 5:00 am #63849
Garage door openers work this way. I agree with the other guys, use electric motors and limit switches, much easier to set up.July 21, 2018 at 2:45 pm #64370
Thanks for being kind to me and pointing out the obvious. I have a few small DC geared motors that I am working on making some herringbone?? gears for to drive sort of like and extruder to see what type of power I can get. I am going to start looking at the cable method to see what I can get to work that way too. I really need to find something to see how much force it takes to break the window loose and then how much to maintain movement.
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