How can i make an automatic egg turner???

i have built an incubator using an old fridge and a computer power pack for energy. i have fitted everything like the fan and bulb and want to fit a automatic egg turner but i have no idea how to do this, any help is appreciated

DC09,,I too made a bator from an old upright freezer.I spent many hours with a measuring tape,and thinking,and reading some here.I should take some pictures for you,and will if you need to see some,but I first had to design the trays the correct size.
I first attached a 1"x 3" exactly in the middle of each side wall,,I drilled 3 holes in each board,7" apart for the tray rods to go into.They were drilled 7/16" in size. I left a top shelf in the freezer to put the water pan on,and to set other items on,such as a spray bottle,ect. I then measured the total width and depth and height of the available room,and left 18" of space height wise from the floor,to the bottom of the lower tray.I then made 3 identical eggs trays,bought some 3/8" round stock from the hardware store,then drilled a hole about 1/2" up from the bottom edge of the tray,exactly in the middle of the tray.This is used for the tray to pivot back and forth on
I also had a piece of flat stock aluminum,1" wide and about 30" long. From this piece,I located the correct spot on each tray,about 3"s behind the hole drilled for running the pivot rod thru,and then drilled a 5/16" hole here,and then put a 5/16"x 2" carrage bolt into.
Since the trays are 7" apart,the holes were then drilled on the flat stock 7" apart and 3/8" diameter hole this time.I now attached all 3 trays,to this one "connecting" rod,,
I left about 6" pf this flat stock past the lower tray hole,this is where I had to use a shorter piece of flat stock,coming up from my motor. I searched e-bay for several weeks,until i found a decent sized motor,with very low rpms,the one I found was brand new,was 1/5 hp,and was geared down to turn only 6rpms,,it came with a 2" pulley mounted on the motor,,
I'm no rocket scientist,but know the smaller size the driver pulley is,and the larger sized driven pully is,the result will be much slower rpms,on the driven shaft and more torque.So I then located a new 7" diameter V belt pulley,made a mounting plate for the motor,and then made 2 wood blocks,that the shaft runs thru,that is attached to the 7" pulley.
Final test results,,,it takes my motor 43 seconds to rock the trays from the top position,bacj to this same position,,I am installing a Peltec 102 relay timer,and will set it for 21 seconds,this will stop the tray once it has moved 1/2 way thru it's travel,,I still do not have all the bugs worked out of the air circulatiation,and heating,and have 50 marans eggs coming mid week,so I am forced to buy a Brinsea 190 EX Advance,,but I do have a friend that wants to buy my freezbator for what I have invested in it so far,when it's done,,but the bugger is huge with 3 trays full,it should hold close to 500 hen eggs and over 1200 quail eggs,,any more help u need,let e know,,

thx frenchblackcopper for the help, could you please upload some pics so i could get a better view on how this works as it sounds confusing. Also when you said,

The 1"x3" boards are mounted exactly in the middle on each inside wall of the freezer,opposite of each other.These actually are what is used for each egg tray to be mated to.The egg trays have a metal 3/8" rod mounted exactly in the midle of them,but the rod extends past the sides of each tray about 1",this extra 1" is used because there is holes drilled in the 1x3 and the rods on the egg trays goes into these holes,,thus giving the tray the ability to roll,back and forth. I must learn how to upload pics here first,and then will go take a few for you.

Okay,,this is my first time uploading pics here,so I hope they post as good as they seem to be on my puter here.
This picture shows a view looking at the side wall of the freezer.You will see the 1x3 board screwed to the side wall that the homemade trays are hooked into,so they can rock back and forth.

This picture shows my 1/5 hp geared motor with the relay timer that can be set to run only as long as needed to more the trays 1/2 a complete revolution.You can see the short "connecting rod" attached to the big pulley,that is then attached to the trays,all trays are hooked together with one long flat stock bar,so they all move at once.

This picture shows what is going on in the top area of the freezer with the shelf that I left inside,,the wafer thermostat and squirrel cage blower motor to circulate air are here. I need to paint the bottom of the freeze bator yet,and make some vent holes thru the top,there is a removable plug already in the floor

Guess that turned out alright??? The squirrel cage motor attaches to the inside roof behind the wafer thermostat.I'm having issues because the squirrel cage motor gets very,very warm after it runs about 10 minutes,,I'm afraid this will constantly add heat inside the bator. I have since added a capacitor to this motor,but have not tested it to see if it still gets hot. I have yet to get the relay timer set for the exact amount of seconds needed to run,then stay off for about 6 hours,but in time,I will get it.You may notice a small ceramic heater on the very bottom of the freezer floor,,this will supply the heat inside the bator,,so far it works pretty good,,I have 3 diffrentdigital thermometers,two with probes to use and check for acurracy.

But to get this bator all set up correct will take me a few days yet and I have eggs coming this week,and they are priceless,so I'm ordering a Brinsea 190 EX Advance tomorrow morning,,this bator will probably be pushed in a corner and forgotten about for awhile.

hi, could you please tell me how the stock bar moves the trays and what direct it moves, ie. up and down. also does the timer control when then motor turns on and off, ie. every 4 hours it turns on automatically. is the wiring for the motor and timer complex?

thanks, the help is much appreciated.

dc09,, if u look at the trays on the left side of them(as your looking towrds the bator) u will see the flat stock bar,each tray has a bolt thru the edge of the tray and the flat stock has a drilled hole in it every 7" apart,thru these drilled holes,the bolt on the tray egde goes thru. This makes all ther trays move at once,and keeps each one the same proximity apart.You will see in one picture off the motor gear set up,there is a short rod attached to the pulley,that then goes up and attaches to the bottom of the first tray,this rod when moving,moves all the trays at once,since they are all hooked together.
Yes,the Peltec timer is hooked up and works very well,,I do have it set properly to only run the motor for 21 seconds,but now I must get it set for how long of an interval I want it to stay before it runs again,,I wanted to set it for every 6 hrs,thuis turning the eggs 4 times each day,but the intervals can be set for as short as you want,,every 10 minutes if you want it to.

could you please tell me the make and model of your timer and motor?

dc09, I sent u mail with my phone number,call me