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Step 5Makeing your sliding assembly.
Ok, here we will make the trolley that will move your marker, or electrode, depending on what version you decide to make =)
First things first, you will need to cut a piece of plywood long enough to hold everything, look at my completed picture, to get a good idea of what this is going to be holding, also take into account the overall length of your drive belt when you decide on how long of a trolley to make. You need to measure the overall lenght of your drive belt, and take that into accout on where your wooden blocks will be mounted. you also will need to take into account the diameter of your drive wheel and your pully.
First thing you need, is a piece of plywod long enough to hold, 2 3/4 inch wide pieces of wood, you can use plywood here, but i would recommend using any type of 1 by, material, as it is better suited to what we will be doing with it, you can see from my second picture, the general idea of what we are making starting to shape up.
You will need enough room between the3/4 inch wood block, and the end of your plywood for 1 servo to be placed. I left 3/4 of an inch, this was more than enough room.
Ok, you need to mesure up, how much motion you need to make your trolley be able to move the full width of the scanner bed, When you know that, you can figure up how much extra wood you will need, so if you want 11 inches of movement, you will need a space of 11 inches (inside dimension) between your outside wooden blocks, so 11 inches, then add 3/4's of an inch twice, so far your up to 12 1/2 inches (this is only a guide, yours will vary, please mesure befor you start) then you need at least 3/4 of an inch on one side for your servo to be placed, so that means you need a total if 13 and 1/4 inches of plywood, as your base.
So after you have mesured your needs, the best way to start is to draw a line in the center of your plywood, then mesure out to the left and the right side, so, if you need 11 inches of travel for your trolley, you will mesure 5 and 1/2 inches to the right side, and 5 and 1/2 inches to the left side, of your center line, put a mark at 5 and 1/2 inches, on both sides, this is were the INSIDE face of your wooden block will go, this is important, if you put your blocks on the wrong side of the line, you will end up with 9 and 1/2 inches of travel, instead of 11.
Ok so, now that we have our lines, its time to cut our blocks, I mesured mine at 3 inches, you dont want them to small or you will not have enough wood to drill the holes for your guide rod.
Attach the blocks on the outsides of your lines, with a SMALL amount of hot glue, then turn the plywood over, and using a drill with a 3/32nd inch drill bit (Or the closest to that size that you have) Drill 2 holes, thru the plywood and into the wooden blocks, do this on both sides, then holding onto the block firmly, use your drill, or a screwdriver, and put a drywall screw into each hole, only turn it till it is snug, so you dont strip the hole.
Next you will need to make a bottom guide, for your trolley to rest against, I used a piece metal from inside the printer I took apart, you can see it installed on the 3rd picture, I used a piece of 3/4 inch thick, 2 inch wide, 2 3/4 inch tall, wood, for the body of my trolley, so i set my guide bar 1/2 inch back, from the front lip of my plywood that way i have 1/4 inch of the trolley body hanging out past the edge of the plywood, Then using the plastic housing of a crayola marker, cut off 2 small shims, to put under the top lip of the guide bar, then put 1 drywall screw into a hole on each end, mine had pre-drilled holes in the right places already, you can also use a piece of wood for the guide if you want to.
First things first, you will need to cut a piece of plywood long enough to hold everything, look at my completed picture, to get a good idea of what this is going to be holding, also take into account the overall length of your drive belt when you decide on how long of a trolley to make. You need to measure the overall lenght of your drive belt, and take that into accout on where your wooden blocks will be mounted. you also will need to take into account the diameter of your drive wheel and your pully.
First thing you need, is a piece of plywod long enough to hold, 2 3/4 inch wide pieces of wood, you can use plywood here, but i would recommend using any type of 1 by, material, as it is better suited to what we will be doing with it, you can see from my second picture, the general idea of what we are making starting to shape up.
You will need enough room between the3/4 inch wood block, and the end of your plywood for 1 servo to be placed. I left 3/4 of an inch, this was more than enough room.
Ok, you need to mesure up, how much motion you need to make your trolley be able to move the full width of the scanner bed, When you know that, you can figure up how much extra wood you will need, so if you want 11 inches of movement, you will need a space of 11 inches (inside dimension) between your outside wooden blocks, so 11 inches, then add 3/4's of an inch twice, so far your up to 12 1/2 inches (this is only a guide, yours will vary, please mesure befor you start) then you need at least 3/4 of an inch on one side for your servo to be placed, so that means you need a total if 13 and 1/4 inches of plywood, as your base.
So after you have mesured your needs, the best way to start is to draw a line in the center of your plywood, then mesure out to the left and the right side, so, if you need 11 inches of travel for your trolley, you will mesure 5 and 1/2 inches to the right side, and 5 and 1/2 inches to the left side, of your center line, put a mark at 5 and 1/2 inches, on both sides, this is were the INSIDE face of your wooden block will go, this is important, if you put your blocks on the wrong side of the line, you will end up with 9 and 1/2 inches of travel, instead of 11.
Ok so, now that we have our lines, its time to cut our blocks, I mesured mine at 3 inches, you dont want them to small or you will not have enough wood to drill the holes for your guide rod.
Attach the blocks on the outsides of your lines, with a SMALL amount of hot glue, then turn the plywood over, and using a drill with a 3/32nd inch drill bit (Or the closest to that size that you have) Drill 2 holes, thru the plywood and into the wooden blocks, do this on both sides, then holding onto the block firmly, use your drill, or a screwdriver, and put a drywall screw into each hole, only turn it till it is snug, so you dont strip the hole.
Next you will need to make a bottom guide, for your trolley to rest against, I used a piece metal from inside the printer I took apart, you can see it installed on the 3rd picture, I used a piece of 3/4 inch thick, 2 inch wide, 2 3/4 inch tall, wood, for the body of my trolley, so i set my guide bar 1/2 inch back, from the front lip of my plywood that way i have 1/4 inch of the trolley body hanging out past the edge of the plywood, Then using the plastic housing of a crayola marker, cut off 2 small shims, to put under the top lip of the guide bar, then put 1 drywall screw into a hole on each end, mine had pre-drilled holes in the right places already, you can also use a piece of wood for the guide if you want to.
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