Drop down shelf

**super-fly** · 02-05-2006, 11:46 PM

I want to do this:

I want to create a shelf that will drop down and go back up with the push of a button. It needs to hold about 3 pounds or so too. I originally was going to try and use an actuator, bit they are way too expensive. I then thought a servo, my only two concerns with this are. One will it hold the weight, and two how do I get it to stop at a certain point.

What I mean is i will install a rocker button for forward and reverse, but how do I make the servo stop where I want it to stop. I only want it to open about two inches and stop and I also don't want it to close too far. I mean I guess I could just hold the button until it gets to where I want it but that would get annoying after awhile.

Here is where I was thinking of putting the servo:

**scott_fx** · 02-05-2006, 11:50 PM

put a contact switch that will get pressed (and cut power)at full extension of your shelf. and then do the same thing for the lead that controls the reverse direction.

am i making sense?

**Wiredwrx** · 02-06-2006, 01:44 AM

I don't think a servo will be strong enough. I think you will need to spring for a linear actuator.

Michael

**xdjxklusivex** · 02-06-2006, 02:01 AM

watcha gonna put on the shelf?

**tja** · 02-06-2006, 06:33 AM

3 pounds of stuff... which will slide off 'cos the shelf is on a slope?

**super-fly** · 02-06-2006, 08:18 AM

No i'm going to attach it to the shelf...so a servo won't hold it? Any other ideas as to what I could use, those darn actuators are expensive.

**super-fly** · 02-06-2006, 08:33 AM

Also...I don't have a ton of room to put a long actuator in. I was thinking pneumatic, but then I'd have to hook a pump up and everything.

I found some stuff on ebay for an air set up, what do you guys think...what else would I need to get?

http://cgi.ebay.com/Pneumatic-Mini-D...QQcmdZViewItem

http://cgi.ebay.com/Mosier-Tiny-Tim-...QQcmdZViewItem

http://cgi.ebay.com/2-in-Stroke-Doub...QQcmdZViewItem

**Enforcer** · 02-06-2006, 08:34 AM

get yourself down to the scrappy (US Translation : Junk Yard) and half inch (US Translation : Obtain) some window winder motors and actuators from some car doors.

**super-fly** · 02-06-2006, 09:04 AM

Like this:
http://cgi.ebay.com/ebaymotors/Brand...35113856QQrdZ1

Will it be strong enough?

What about a high torque servo like this:

http://cgi.ebay.com/NEW-Traxxas-REVO...QQcmdZViewItem

**Scouse Monkey** · 02-06-2006, 09:04 AM

or hack apart a G glamp with a coarse thread and hook up the threaded rod to a motor with buttons to stop the motor when open or closed. Make sure you pivot the motor and threaded part on the shelf.