Day 01/05/2015 06:00pm - 09:00pm

Attendance:

- Students
Olivia
Tekoah
Wesley
Matthew
Owen
Samuel
Melea
Taylor
John Paul

-Mentors
Coach Jeff
Coach Mike
Coach David


Safety Topic

Tool Safety

Hand held tools can prove as dangerous as actual machines. Inspecting tools before each use can ensure safety. When hand tools break parts can fly surprising far at high speeds. we only ever found two parts of the wrench below out of three or four. --Owen


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Here is a broken wrench that I did not break. --Owen

Tasks

  • Build Pickup
  • Build Turret
  • Prototype Grapple
  • Prototype Plow
  • PTC - Plow

Reflections


Build Pickup

We made some adjustments to the pick up tonight. Last week we realized that we needed another sweeper. To assemble this new sweeper we had to borrow some parts off of Sparky. We cat a PVC pipe and attached the green grippy sweepers to it. We were outside of 18 inches so we moved the entire assembly back in the robot a half inch. This effected the motor placement so we moved the motor a little higher and used a longer chain that connects to the 2nd sweeper. ~Olivia
Today after last week's prototyping we found out our ball/block-pickup idea works so now it's time to start on the real thing we had to wait on our side plates Leonard Metals one of our many great sponsor, after we got our side plates from Leonard Metal for the ball-pickup we started building it with pipe and some green tread we had for the wheels we were going to use on our drive-train but since we are not going to drive up the ramp and we are going to have a arm to deilver the balls and blocks so we can have a super fast drive-train so there is no need for the green tread on the drive-train so now its going on our pickup and it's going to be awesome. The first thing we have to do was bend the side plates a little the reason we have to bend in the shop and we sponsor didn't do this was so we only had the PTC one plate making it lot easier for our PTC people on the team, after the bend was made we cut out some PVC pipe we have and drilled holes in it to put screws in it with the screws in we added the green tread and zip tied it to the pipe and thats about as far as we got hopeful we can finish this at the next meeting.~Melea

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Here we are using the new plates from Leonard Metal ~Olivia
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Screwing in some screw to hold our pickup together.~Melea
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Replacing the hard plasic tubing with softer green rubber strips.~Tekoah

Build Turret

Today we completed andmodified the turret to allow us to preform better on the field. First issue to fix was our springs we added a part that the springs could attach to which we had already bent on the break press allowing for a nice fix for the spring. Next we cut part of the turret plate giving use more room on the robot and cuttig away needless part of metal giving use room to add newer parts. After all the neit picking was done we reassembled the turret and add our new parts to the build and tinkering with other ideas that could possiably help. Once the turret was reassmbled we added it back to the robot. --Taylor
Today we worked on several small problems and things we did not finnish on the turret. First we had to change out a screw that we were using to tie the string to. It was to long and making it were the slides could not go all the way so we just put a smaller screw in. We also manufactured a piece for that would attach to the gear so that the springs could attach to it. We started by taking the turret apart and cuttting down the piece that was previously there to make room for the new one. Then we got a scrap piece of aluminumand cut it to the size that we needed. Next we put it into the brake press and folded it into a 90 degree angle for the springs to connect to. Then we put the piece in the milling machine to put the holes for the springs and mount it to the gear. When we finished we put the turret all back together put it back on the robot and tied all the strings all back together.-Samuel
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Cutting away unessasry parts from the turret. --Taylor
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We to take the whole turret apart to mount the piece then put it back together.-Samuel

Prototype Grapple

So we were looking at our current grapple system, and we decided that it was not as fast as we needed. We had already used up all of our DC motors, so we had to switch to a continuous servo to turn our tape measure, and this reduced our overall winch speed. To fix this we came up with two possible solutions: Have a bigger wheel pushing the tape or gear up assembly. We decided to prototype for the bigger wheel as that design would take less modifications to the grapple design. We settled upon a six inch wheel as the optimal size for the space that we had readily avaliable. The prototype was made with half inch thick plywood cut on the band-saw, and sanded down with the belt sander. We made some quick measurements for mounting points with a circle-center-finder, which is basicially a square (the tool not the shape) that has a slot in the center of it so that you can mark with a pencil. Four or 5 marks later and we had our centerpoint which made drilling out four holes, to mount wheel hubs easy. When we tested the new wheel we found that the flat edge did not always properly grip the tape and would sometimes slip. Seeing that this design was not truly effective helped us to switch to the 'gearing up' design, which will take more effort to complete, but will be much more reliable. We plan to gear it up using sprockets and chain instead of gears to save space and weight. To mount the wheel with the chain and sprocket, we will need to use a free spinning shaft and bearings to support the wheel that spins the tape measure. -John Paul and Matthew

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Here I am cutting out the wheel with the bandsaw. -John Paul
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We are still using our main tape measure grapple assembly, but we are changing the drive motor to a continuous servo that is geared up for speed. -Matthew

Prototype Plow


For this design we needed a ''locking mechanism'' that would hold us in place as we attempt to score that would also double as a plow. After we brainstormed on a concept that would accomplish both of these task we started working on a prototype, this will allow us to see if the idea would work. The concept is a large piece of aluminium that would span from one side of the robot to the other, this plate would slide down, with the a push from a servo, locking us onto the first churro and then it would be pulled up a set of springs. The springs would act as a fail safe in the event that the servo broke or became in inoperable for some other reason the plow would be pulled up and out of the way allowing us to go up the ramp. When the blade is down we will be able to plow though the debris on the field. Wesley



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Here we are marking out the lines that will be cut away with the bandsaw. - Wesley

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We are drilling out the holes for the springs to attach to -Wesley
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After we manufactured the parts we assembled every thing and began testing the concept. - Wesley
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Here is the finished prototype for the plow. - Wesley

PTC - Plow

The plaw required a much smaller number of custom parts compared to other sub-assmblys. --Owen

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Here is the outer plow thing that is messed up. --Owen


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Here is a sketch of it. --Owen

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Here is the iner plate for the plow that still needds bending. --Owen


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Here is the plow front plate sketch. --Owen