DIY Projector lift Project

I have been posting info about this project in various forums within AVS (without luck). I guess I am posting in the wrong area. So I am wondering if I post the link to the post I mught get some responses and advice. So here is a post:

DIY Projector Lift

So in that post i am trying to double check my math and regards to the amount of drop necessary. I am trying to decide between a 18" or a 24" linear actuator.

I looked at the measurements of the actuators and did not like the size, so I started looking the following electric motors:

Firgelli Electric Motors

I considering the electric motor in an attempt to shrink down the size of this project. The only thing is I am not sure where to begin to pickout:
1. the proper Electric motor
2. What sprockets to use.
3. I would certainly love help controlling the motor but I will be contacting Firgelli support on this issue.

Thanks

I am wondering if this electric motor would work
http://www.firgelliauto.com/product_...roducts_id=202

If so can you suggest a sprocket combination that would work:

http://www.mcmaster.com/#chain-sprockets/=bzog6a

Here is a link that I am looking at:

DIY Chain Projector lift

Although I would still want to maintain the same type of drop as as my first example but modify the design to accomodate a chain driven assembly. This would shrink the space required for the setup dramatically plus possibly cut down on cost.

Thanks for the info. My original post is calling for a linear actuator. I was wondering if you would mind reading my original post to check and make sure my math is correct for the drop.

So today I got up into the attic and did some measuring and general layout of mounting the linear actuator. Due to space purposes, I had to make a change to how I mount the Linear acuator. SO here is a picture of the new layout:



I am wondering if mounting the Linear Actuator in that manner with only one pulley will work???

I thank you in advance for any help you can provide

So I am looking at pulleys trying to figure one that might work. I found the following on Grainger:
http://www.grainger.com/Grainger/RON...RV2?Pid=search

I am thinking that by mounting the actuator horizontally (like in the drawing) it will cause a pulley to sway, so I am trying to find a pulley that mounts on a solid bracket and just guides the rope around.

What do you think?

Thanks again for the input. I did not understand by what you meant when you stated "Your pulley and cable approach will be able to raise and lower the PJ, but whats to keep it from spinning?"

I am guessing you are referring to what make the linear actuator stop once it starts. The actuator has a built in limiter, that stops it when it reaches the end. I can also order a wiring kit where I can install a limiter switch that stops at a desired length.

Looking forward to hearing from you. Is there anymore to this 80/20 lift that I can read? I see the photo but would like to read about the process if possible.

I apologize for the confusion, there will be four ball bearing drawer slides guiding the projector lift up and down. Can you provide a web page about the 80/20 project

I have been to the 80/20 website before but I was hoping to see a thread or web page describing build of the above projector lift. Including items like how it was automated etc.

Thats funny you provided that link because that is what I am building but I was trying to make sure that my Pulley adjustment" (due to space) will work before all the part get ordered. I was going to order a 18" actuator but I am afraid that might not give me much leeway for error, so I am going to order a 24" and use a external limiter switch.

So beyond the actual building of the 80/20 lift, how does a person automate that lift

I did not see the actuator attached to the lift. Interesting design