Graber i3 Metric Bill of materials uk

I have a Graber i3 Laser cut mdf frame, This is apparently a list of parts I need to finish. I tried converting in/mm, I'm not sure what metric equivalents I'm looking for, regarding rods / bolts / nuts / washers. There is not much information about building this 3d printer.

Threaded rods

• 5/16" x 2" (y-belt idler) (Qty) - 2

• 5mm x 11.5" (Z-Axis) (Qty) - 2

Smooth Rods

• 8mm x 13.5" (Y-Axis) (Qty) - 2

• 8mm x 12.5" (Z-Axis) (Qty) - 2

• 8mm x 15 3/4" (X-Axis) (Qty) - 2

Bolts

• 6-32 x 3/4" (Qty) - 41

• 6-32 x 0.5" (Qty) - 6

• 6-32 x 1' (Qty) - 2

• 6-32 x 1,1/4" (X-Car) (Qty) - 4

• 6-32 x 1,1/2" (Qty) - 8

• M3 x 10mm (for step motors) (Qty) - 15

• M3 x 25mm (RAMPS mount) (Qty) - 3

• M3 x 20mm (Heated Bed) (Qty) - 4

Nuts

• M3 Nut Nylon Insert (Qty) - 7

• Nut 6-32 Nylon Insert (Qty) - 61

• Nut 5/16" (Qty) - 2

• Nut M5 (Qty) - 2

Washers

• Washers 6-32 (Qty) - 6

• Washers 5/16" (Qty) - 2

Other Parts

• Spring (heated bed mount) (Qty) - 4

• Zip Tie 4" (Qty) - 7

• 608zz (for Y and X idler) (Qty) - 2

• PVC Tubing 20mm (Z-Axis) (Qty) - 2

• Nema 17 Step motor (Qty) - 5

• Micro Switch (end stops) (Qty) - 3

• Electronics Board (RAMPS or any) (Qty) - 1

• LM8UU (Qty) - 10

• Extruder (Qty) - 1

• Wade Gear (Qty) - 1

• GT2 Timing Belt/Pulley (Qty) - 1

Hi there,

I'll also be trying to build the Graber i3 in the coming months. I agree that decent BOMs are nowhere to be found.

Some of the items are not quite clearly described, and sourcing them will be guesswork - what strikes me as wrong ist the quantity of GT2 Belts / Pulleys. There ought to be (at least?) two, X and Y axis are belt-driven, Z-axis is screw driven as in the original Prusa i3.


I found another BOM here [lazyzero.de] [german wiki] but that doesn't seem to be complete either. Here's what I extracted from that page:

Electronics
1x Mega2560 R3 ATmega2560
1x RAMPS 1.4
1x MK2B Dual Power PCB Heat Bed
3x Mechanical Limit Switch Module Board V1.2
1x RAMPS 1.4 LCD12864 Intelligent Controller LCD Control Board
5x A4988 Stepper Motor Drive Module
1x 12V 15A power supply unit
1x Extruder 0.3mm Nozzle for 1.75mm Filament w/ 100k NTC

Mechanics
10x LM8UU linear bearing
precision ground rails h6, hardened (from a mechatronics supplier)
2x 8mmx400mm
2x 8mmx342mm
2x 8mmx317mm
2x Flexible 5 mm x 5 mm Shaft Coupling D20L25
2x GT2 20-Tooth Pulley 5mm Shaft
2m GT2 belt 6mm width
1m M5 threaded bar
4x brass nuts

I'm not sure what the brass nuts are for, plain steel ones will probably do the trick.

When I get to it, I'll try and put some of this on the RepRap wiki - I'd eventually like to do a buildlog. However, I'm short on time until Xmas.

edit: I compared the two lists and put them on the wiki - check it out: [reprap.org]

Edited 1 time(s). Last edit at 09/11/2014 03:55PM by harry32.

Did you get assembly instructions with your frame? I am scratching my head wondering how I am going to fix a nut for the z axis threaded rod. My kit has round holes cut where a hex hole should be. The 5mm nut seems too big to be wedged in. I wondered how you did yours before I take a hammer and try to fit a hex nut in a round hole!

I haven't bought the frame yet because I'm trying to make it myself - the only assembly instructions I found are uncommented: [twelvepro.com] Take a look under "Laser Cut x-Axis Assembly".

The M5 nuts are intended to be wedged between two pieces, but at least one of them should have an appropriate hexagonal pocket cut out, so the assembly will be flush. If you don't have these pockets I bet they forgot to cut them out during production.

I would suggest you try drilling the hole to 8mm diameter and use superglue to fix the nut. Just be sure it's put in *really* flat, otherwise the threaded rod won't turn properly. I've had a host of problems with the lead nut when I was assembling my Shapeoko CNC.

Or maybe the seller will exchange for some properly lasered parts?

I found new build documentation for the Graber i3, here:
[berthareprap.blogspot.co.at]

There's also an entry about the bill of materials:
[berthareprap.blogspot.co.at]

Brass nuts on the z axis lead screws replaceable item as it will wear b4 the threaded rod.

Ben

See next post

Edited 1 time(s). Last edit at 01/21/2015 08:21AM by johnnyfm.

did you get this resolved?
I have the same issue?

Quote
Macflame
Did you get assembly instructions with your frame? I am scratching my head wondering how I am going to fix a nut for the z axis threaded rod. My kit has round holes cut where a hex hole should be. The 5mm nut seems too big to be wedged in. I wondered how you did yours before I take a hammer and try to fit a hex nut in a round hole!

I solved my problem.
[www.ebay.co.uk]
I tapped it into place after putting some PVA glue around the hole at the top of the assembly.It works very well.
I did think about putting one at the bottom as well but if the threaded rod wasn't 100% straight it might have caused problems with jamming.