Section 2.2 Assembly of the Y Unit Mounting the Front and Back Plate

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	1x Nema 17 48mm Stepper Motor
	1x GT2 Pulley

• Mount the pulley onto the motorshaft with the two little set screws. You can find these screws in the little white bag in the box of your RUMBA electronics.

• The distance between the pulley and the motor is 8mm.

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	1x Y-Motor mount
	1x End-stop Cover Top
	1x End-stop Cover Rim
	1x Hall-O End-stop
	3x M3x10 Cylinder Screw
	2x Torx 3x10 Screw

• Mount the motor onto the Y-Motor Holder

• Be sure that the motor connector is facing downwards.

• Mount the end-stop with its cover. Don’t make the screws too tight.

  • Find the covers in the bag with Acrylic laser cut parts

• In the little box of the end-stops you will find 6 little magnets: don’t loose them!

The result looks like this

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	1x Power Connector
	2x Glass Fuse

• Put the two glass fuses into the power connector

• Connect the high voltage power cable to the Power connector as shown.

  • The connection might be stiff. Be patient and firm, but be careful not to break the power connector pins.

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1x Back Plate

• Be gentle with the aluminium plates. You don’t want to scratch them already.

• Click the power connector into the Back Plate.

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	1x Power Connector Cover
	1x Torx 3x16 Screw
	1x Teethed Washer

• Pull the power cable through the hole on the left of the Power Connector Cover.

• Mount the Power Connector Cover with the plastic screw.

• The teeth washer should ensure electrical contact between the ground wire and the aluminium back plate.

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	1x Front Plate
	2x Round Nut

• Put the front plate onto the threaded rods.

• Put the round nuts to the M10 Threaded rods. Do not fix the front plate yet.

• Firmly hold the M10 rod and fix the round nut onto the M10 rod.

• The front plate should still be loose now.

• Fix the front plate by tightening the round nuts.

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• Tighten the M10 nuts on both sides of both Y-Middle parts

• Make sure that both parts remain straight.

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	2x Smooth Rod 8 x 385
	3x LM8UU Linear Bearing
	1x Y-Back Left
	2x Round Nut

• In general be careful with the aluminium parts and prevent scratches by putting a towel on the table.

• Test if the smooth rods can enter the hole in the aluminium plates. The holes in the aluminium plates are very accurate and the smooth rods might have a little bur from cutting them. If they don’t fit, carefully file of the edge of the rods a little bit until they all fit.

• Put the linear bearings on the rods.

• Put the Y-Motor Holder and the Y-Back Left part on the M10 threaded rods

• Put the smooth rods on the front plate.

  • Mind that the right hand rod has two bearings, the left rod only one.

  • Make sure that the left hand rod enters the slot hole in the front plate through the slot hole of the Y-Height adjuster. With the height adjuster you will later make the two smooth rods perfectly parallel.

• Put the Back Plate on the M10 Rods.

• Tighten the round nuts and the corresponding M10 nuts in such a way that the back plate is nice and straight.

The result looks like this:

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• If you are having difficulties making the unit straight, see what happens when you loosen the M4 screw on the Power Supply, make the unit straight and fix it again.

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