David A's New 2x3 Bench Top CNC

[davida1234]

Hello,

This my build thread for a 2x3 desk top which I developed over the last few years. Hope you enjoy it!



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[davida1234]

Side frames have shear panels with anchors and carbon fiber reinforced epoxy inside the extrusion slots. They are structurally rigid single pieces.

[davida1234]

All holes and access points required for assembly are pre-drilled.

[davida1234]

ASSEMBLY OF MACHINE FRAME:

[davida1234]

Attach braces to the 3030 cross beam:


Front cross beam installed:


Both cross beams installed:

[davida1234]

Main frame assembled:

[davida1234]

Feet for the machine are 1" HDPE pucks with pressed-in 1" bolts:


They screw directly into the bottom of the extrusions:


Feet installed:

[davida1234]

BED AND TABLE

Bed is a 2x3 aluminum sheet and 1515 stringers. All holes for assembly are pre-machined:
Attachment 411268

Install stringers:
Attachment 411270

Various 1" HDPE parts will be attached to the bed sheet. Spread out an even coat of open gear grease to all the mating surfaces of the HDPE pieces. Make sure all mating surfaces are covered:
Attachment 411272

Attachment 411274

Install the pieces, making sure grease is squeezed out a bit:
Attachment 411276

Attachment 411278

[davida1234]

Under side of machine bed with HDPE parts installed:




Top of machine bed with the 1" HDPE table with clamp slots:

[fretman_2]

Looking good. As with others of this design...how's the side load stiffness?

[davida1234]

Thank you fretman_2.

It feels stout so far. I think the epoxy embedment along the full perimeter of the shear plate makes the side panels quite twist resistant. There are three 3030 cross beams connecting the side panels with large corner brackets. One of them is not visible behind the gantry. See attached pic. So far I didn't see a need for them but larger flat brackets could be added to front and back if necessary.

[davida1234]

With the main frame assembled, 20mm linear rails are installed:


Pretty straight forward:

[davida1234]

Gantry Beam and Y/A Carriages:

3060 gantry beam:


Install 20mm linear rails top and bottom and then the Y/A carriages to the bottom:


Turn gantry around and place it onto the linear cartridges:


Attach the carriages onto linear rail:

[davida1234]

Machine frame with the gantry:


Install big braces to gantry beam and the Y/A carriages:

[davida1234]

Install end caps:

[davida1234]

To finish the assembly of the main frame, plastic trim needs to be installed as shown:


Same as with other plastic parts, use open gear grease on mating surfaces:




Basic assembly of machine frame is finished:

[davida1234]

Btw, how do you make the posted pictures show up larger? They all end up posted as smallish thumbnails but are at the 1025 pix and 500kB limit?
I tried it both as attachment and as image but no difference. Thanks.

[davida1234]

test...

[davida1234]

test 2

sorry.......still trying to figure out how to upload a full size image and not a thumbnail

[Arjay]

Nice work.