jitsbuild-platform [Bukobot 3D Printer Instructions & Docs]

======jit's build:  Platform======

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=====Heated Platform=====

Shown here is the 8" heated platform.  The other types of platform assemble in a similar way.

If you don't have the heated platform, skip down to [[jitsbuild-platform#mounting the platform|here]].

Find this ([[bukobot-parts-list#platform|bag 6a]]):

{{wiki:jitsbuild:platform-heater-kit.png}}

Get out your heated platform.  Leave the glass sheet in its protective packaging.

If the lugs aren't already crimped onto one end of the thick red & black zip cord, get out your crimping tool and crimp them on.

Put the screws on the top of the bed and the nuts on the bottom (the top says "HOT SURFACE!" around the edge), as shown below, then attach the spade lugs:

{{wiki:jitsbuild:heater-connections.png}}

Red goes to positive, black to negative. Cover the screw heads and the nearby conductive areas with kapton/polymide tape to avoid any accidental short circuiting.

The flat side of the lugs goes against the heated bed.

(In some of the images below, the lugs are shown attached to the top of the platform.  It is recommended that they be attached to the underside instead, as shown above.)

While you're here, look inside the little hole in the middle of the heated bed:

{{wiki:jitsbuild:platform-thermistor.png}}

The tiny thermistor should be touching the side of the hole, or really close to it.  If necessary, move it closer to the wall of the hole.  It must not protrude from the hole. Don't break it. The pre-installed thermistor from Deezmaker is very sensitive, so as long as there is kapton tape (polyimide - the gold tape) covering the bottom and the thermistor is close to the inner wall of the hole, it should be pretty accurate.

For best results with some plastics, the heated bed should have a layer of thermal insulation under it. The kit comes with a length of White Thermal Ceramic Insulation Cloth. 

Cut this into four equal lengths, about as long as shown below (you may have some left over, which you might find useful on your hot end). Don't cut it so long that it covers the screw holes.  Before peeling off the white plastic that covers the adhesive, lay out the insulation to check how you will apply it (see the below image for an example).

The ends of this woven material tend to unravel, so it's recommended that the cut ends be covered with polyimide tape (not shown here) before adding the insulation to the platform.

Remove the backing on one strip at a time and apply it to the bottom of the heated bed as shown. The bottom says "HELIOS", and the top is the side where "HOT SURFACE!" is printed around the edge. 

{{:headed-platform-insulation.jpg?800}}

You might want to add some polyimide tape around the edges to hold things in place.

Some people find that the insulation can fall off. To prevent this, you can outline the cloth with polymide (Kapton) tape, half on the cloth and half on board and in between each strip to help the edges from peeling with time.

{{ :img_2389_-_version_2.jpg?800 |}}

Greater detail on the preparation of the heated bed should go on a [[heated-bed-preparation|separate page]].

=====Mounting the Platform=====

If you don't have your platform out, get it out.  If you have a glass sheet, leave it in its protective packaging for now.

Find the remaining parts from the platform mount kit ([[bukobot-parts-list#y-carriage|bag 14b]]):

{{wiki:jitsbuild:platform-mount-kit2.png}}

Put nuts into the hexagonal depressions on the two adjuster wheels in the usual way.

Put the two long flat-head screws through the holes in the corners of the front edge of the platform (the back edge of the heated platform has the hookup wires).  Their heads go into the chamfered holes in the top surface of the platform.  Nuts go on the other side:

{{wiki:jitsbuild:platform_underside.png}}

Move the Y carriage to the front, and position the platform on top of it.  If you have the heated platform, the wires lead out toward the back.

The center hole at the back end of the platform goes over the standoff at one end of the Y carriage.

Put one spring under each of the long screws:

{{wiki:jitsbuild:platform-springs.png}}

Put the short flat-head screw through the hole above the standoff, and screw it down just until you feel just a little resistance.  Do not tighten this screw any further;  it should be a little loose.

Push the long screws down through their holes in the metal plate, and screw adjuster wheels onto them on the underside of the platform, with their nuts facing down:

{{wiki:jitsbuild:platform-adjusters.png}}

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