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Author Topic: NACA 66 Special A/BGS  (Read 318395 times)
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Interested Observer
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« Reply #1140 on: February 13, 2016, 08:33:52 AM »

Powered trailer tongue jack with appropriate mounting and linkage as/if required, e.g. backhoe bucket linkage or similar.

Gear motor with (SS) chain and sprockets.

What is existing configuration?
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« Reply #1141 on: February 13, 2016, 11:27:36 AM »


How about welding on a steering arm and using a linear actuator to swing the crane around? Many 12v actuators have limit switches built-in. I used to have a C-band satellite dish that used one to steer the dish in hour angle.

Regards, Neil  Tucson, AZ

It's hard to get a full 180 degree swing with an arm and actuator. We actually only need about 160 degrees but tat might still be too much.

You could drive a geared rack with the linear actuator, with a pinion gear at the base of the crane?

That is a neat idea but most linear actuators do not do well with a type of side load that would be generated from a rack and pinion (gears want to separate). It's not impossible but it would start to get pretty complicated.
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« Reply #1142 on: February 13, 2016, 11:39:16 AM »

A backhoe linkage does give us more rotation.
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« Reply #1143 on: February 13, 2016, 11:41:34 AM »

I like the bottle opener. cheers
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« Reply #1144 on: February 13, 2016, 11:53:40 AM »

How about a ss cable with a 12v winch mechanism. Look at how it is used on a snowblower chute.

Ron
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« Reply #1145 on: February 13, 2016, 12:10:09 PM »

Rob,
Go with the linear actuator and use a timing belt instead of a chain. Won't rust and plenty strong. The other thought is a high torque engine starter with a sprocket on the shaft and a larger sprocket around your tower. Probably a smaller package than the linear actuator setup.

Rex
 
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« Reply #1146 on: February 13, 2016, 12:27:04 PM »


Rob,
Go with the linear actuator and use a timing belt instead of a chain. Won't rust and plenty strong. The other thought is a high torque engine starter with a sprocket on the shaft and a larger sprocket around your tower. Probably a smaller package than the linear actuator setup.

Rex

I'm thinking on using the trailer tongue jack for a power source and welding starter pinion gear on the lead screw, welding a ring gear from a Chevy v8 flex plate. Of course the whole trailer jack could be shortened up a good bit. Slider that makes contact with ground would be eliminated, and support bearings would need to be added to both sides of pinion. We could cut a window into the outer tube to let the ring gear come through. To interface with the pinion.
Let me do the math but my gut feeling tells me speed and torque would be about right. If speed is acceptable,  I'll draw it up inSolidworks to design all the support brackets.
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« Reply #1147 on: February 13, 2016, 12:31:03 PM »


I like the bottle opener. cheers

That's the most important part of the trailer. LOL
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« Reply #1148 on: February 13, 2016, 12:37:30 PM »

The trailer jack provides us with a low cost, high torque, slow speed 12vdc motor. I spent loads of time looking for something like this and I already had one on the front of my trailer. LOL
This is the real value of this forum. Nobody gave me exact answer I was looking for but the bottom line is I am much closer to a solution less than 24 hours since I posted about this.

It certainly helps to have a bunch of smart friends that I can bounce ideas off of.
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« Reply #1149 on: February 13, 2016, 12:41:54 PM »


I like the bottle opener. cheers

Btw, that stainless bottle opener has our 5 standard grades of coating on it. You can see this if you zoom in. When people ask "What is Carbinite?" We always have a handy sample to show them.
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« Reply #1150 on: February 13, 2016, 02:29:23 PM »

Didnít quite follow the Chevy ring gear approach but might consider--

Motor mounted pinion down on the upper, rotating column.
Drives into a twin flange bearing mounted shaft with shaft projecting down to the fixed column.
Shaft has Rexís timing belt small pinion engaging belt around larger pulley fixed around the lower column.
Could use chain if belt is too spongy, or gears, but lube and corrosion problems.

Or, turn it all over, but may interfere with boom brace.
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« Reply #1151 on: February 13, 2016, 09:36:34 PM »

Mr. Belt-and-suspenders sez:  How about putting some kind of brake in the system to either/or slow/stop when the swing gets out of control for some unexpected reason?  Don't rely on the reverse torque/drag of the thing -- be positive.  That ain't a cheap car that's swinging towards the wall's upright beam.
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« Reply #1152 on: February 14, 2016, 08:27:00 PM »

If we could use a worm gear it would be a natural brake.
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« Reply #1153 on: March 16, 2016, 10:42:38 PM »

Time for bi-annual reconstruction.
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« Reply #1154 on: March 16, 2016, 10:44:39 PM »

Hopefully going to the sandblaster on Friday.
Can't find any cracks in any of the welds so far.
Plenty of souvenirs from Bonnieville and area 52. Gosh darn it, every surface we run on is corrosive. We need a new hobby.
Big debate amongst the team members on what color to paint the chassis. Definitely  not going to be bright orange.
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