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1st project - rotating monitor - no name
danny_galaga:
I used ball races instead of castors too. simpler, and cheaper!
csa3d:
--- Quote from: Haterot on July 06, 2009, 10:03:07 am ---Also I can't tell from your pics, but how did you attach the motor's body to that strip of wood?
--- End quote ---
When I bought the gearmotor from solarobotics, I purchased the right angle mounting bracket that came with it. One bolt keeps the motor on the bracket, and two screws adhere the bracket to the wood. I had to drill out the bolt hole a tad bigger using my drill to fit the bolt through. I'm sure If I made a special trip to the store that step would have been unnecessary.
Then I made an adjustable "shelf" using some dremmel out right angle brackets, so I could adjust the pressure of the wheel on the rotation disk. Notice how I turned the base hole into a slot on the brass braket.
Then it's just a matter of aligning everything and adjusting the pressure
-csa
Haterot:
ugh. I was at 3 stores yesterday looking for angle brackets that could slide. I should have realized you machined those. I did replace my casters with the bearings and it turned better. I also put the motor parallel to the disc and it worked...somewhat. :-\
The only problem I ran into was that my disc that I am turning on is welllllll not so smooth. So i need to re cut the mounting disc :)
But i think it will work. Going to try that tonight I hope, unless the lawn needs mowing.
csa3d:
--- Quote from: Haterot on July 07, 2009, 08:31:08 am ---ugh. I was at 3 stores yesterday looking for angle brackets that could slide. I should have realized you machined those. I did replace my casters with the bearings and it turned better. I also put the motor parallel to the disc and it worked...somewhat. :-\
--- End quote ---
Don't worry, I did the same thing. I was super frustrated with not being able to find slotted right angle brackets, which led me to my dremmel tool. If you go the same route, definately CLAMP or temporarily screw the right angle bracket into something before using the dremmel on it. Mine went flying half way through the cut, and I'm lucky it didn't get me or my monitor which was near by.
--- Quote from: Haterot on July 07, 2009, 08:31:08 am ---The only problem I ran into was that my disc that I am turning on is welllllll not so smooth. So i need to re cut the mounting disc :)
But i think it will work. Going to try that tonight I hope, unless the lawn needs mowing.
--- End quote ---
I couldn't tell from your pics, but your wheel doesn't look super crooked. I did make a router jig to cut mine, so yeah.. if you did it with a jig saw then I can see it being a bit off. Another thing you might want to try is to completely REMOVE the bolted axel through a skate bearing mount. My rotation platter is completely supported by only the "wheels", and since the monitor is at a slant, it's not going to pop out or come off track due to weight and gravity. If I was going to transport the machine, it's real easy to also remove the monitor for safe keeping.
Keep us updated. Hope your grass is short. :)
-csa
Haterot:
Well, fortunately (or unfortunately) it has been raining the last couple days, so no mowing, just lot's of work.
My first attempt at salvaging my motor setup was to create a brace below the disc and place two support wheels there.
This was not succesful, to say the least. the brace board was a little to low so I would loose contact with the wheel, then when the bearings came
back into contact it would cause the wheel to slip. bad bad bad :badmood:
So I stole a little thunder from the experts here ::cough:: csa3d ::cough:: and created a new backing board with support wheels at the bottom.
here you can see the layout as I'm working. motor at top, actuators switches to the side and one wheel installed below so far.
Here is the board mounted with monitor. I retained the center pivot point and used one wheel at the bottom for support. mostly because the second wheel was getting in the way of the actuators. I had already mounted the wiring and motor and couldn't be bothered with moving the actuators again. Mostly because I dropped the motor/wheel while it was still wired and tore one of the contacts out of the motor. Pissed? yeah just a !(*Y#(! tad. But fortunately this worked out in my favor which i will explain in a bit.
So taking more advice from csa3d I busted out my dremel and a metric nut ton of cutting discs and went to town on several L-brackets, making them into sliders. Protip: inform your wife you are doing metal work so when she comes out into the garage to see "what's up" she doesn't freak out from the shower of sparks.
So I mounted my motor/wheel on sliding L-Brackets (Thanks again csa3d) AND I mounted a new wheel at the top. My monitor is at a 25 degree pitch so tended to want to move forward a bit. the top wheel rides along the top of the disc holding it down. So I have the bracing wheel below, the 4 wheels on the bottom and the top wheel holding the monitor in place. the center picot point is still there but not nutted down tight, just turning on a bearing and acts as the center rotation point. The sliding L-bracket is the key to the tension/friction for the motor.
So I fubared my more powerful motor and had to hunt for the lesser motor the original wheel setup came with. Turns out with the stronger wheel i was having trouble with over shooting the monitor and had to install physical stops. These worked OK, I used felt padding as bumpers but they tended to 'bounce' a bit and would offset the monitor a bit. The smaller motor spins slower but stops dead when the actuators reach their terminus. Don't need a physical stop (took it out) and have had no problems since. So i got that going for me, which is nice.
So i got the inner bezel cut of foamcore. I went with an idea javeryh threw my way and I am happy with it. You may notice the foam core on the top/bottom of the monitor has an edge angled. yeahhhhhh Don't make your cabinet only an inch or so wider than your monitor diagonal if you are going for rotation. The chopped pieces were necessary to allow the monitor to turn. if you look close you can't see the edges behind the outter bezel both in horizontal and vertical mode.
so that's where I stand, working rotational monitor, working bezel, partially completed cab, no control panel yet, no artwork or marquee. Out of all the frustrating parts still to come I am stressing most over the artwork. I still don't have a theme for the cab. :embarassed:
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