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Hey! This thing is still a Work in Progress. Files, instructions, and other stuff might change!

Huge Cheap Home CNC (#hchcnc)

by Enic Jul 14, 2018
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What is the accuracy like when machining? It looks like you might get a lot of movement from hanging the Z axis so far down.

Thanks for Your question and thanks for waiting my answer.

The accuracy is enough only for 3d printing and laser engraving. Also suitable for drilling. But Yes the height is really huge. Currently i was added a static table of 300 x 400 at a half of a height and usually was adding additional height with books or boxes if the accuracy is really needed for exact thing.

Currently i'm working on an automation of JET BD-7VS Mini Lathe and will publish a project here as soon as it will be at reasonable stage.

You can follow up a progress at https://www.youtube.com/playlist?list=PLzrRaR6uGukVQ6zqabL5Yk4NpBCBEIePF

Likes and subscribers are welcomed on-board ;-)

curious what kind of feed rate do you get with the nema 17, I am debating if I should go with nema 23

Thanks for Your question.

You did not specify which operation in question? Most likely milling. I use the Deremel 4300 at a speed of 35,000 rpm. However, of course, one has to sacrifice a slow feed rate in favor of the universality of the device.

I think that Nema 23 is too heavy and too big for such a design as mine. Meanwhile, if you think about milling as the main operation, certainly Nema 23 will be a better choice.

Just speed in general, either milling or even a rapid movement or a jog. Your control software should have a setting for max feed rate, ie 1000 mm/min. I know my 3D printer can get good speed, but that is a very small machine compared to this

Thanks for waiting for the answer ;-)
I'm using standard Marlin_1.1.8 firmware
and the speed control section looks like:
X, Y, Z, E0 [, E1[, E2[, E3[, E4]]]]
define DEFAULT_AXIS_STEPS_PER_UNIT { 516, 516, 160*16, 145.422 }
X, Y, Z, E0 [, E1[, E2[, E3[, E4]]]]
define DEFAULT_MAX_FEEDRATE { 300, 300, 5, 25 }
X, Y, Z, E0 [, E1[, E2[, E3[, E4]]]]
define DEFAULT_MAX_ACCELERATION { 3000, 3000, 100, 10000 }

define DEFAULT_ACCELERATION 3000 // X, Y, Z and E acceleration for printing moves
define DEFAULT_RETRACT_ACCELERATION 3000 // E acceleration for retracts
define DEFAULT_TRAVEL_ACCELERATION 3000 // X, Y, Z acceleration for travel (non printing) moves

define DEFAULT_XJERK 10.0
define DEFAULT_YJERK 10.0
define DEFAULT_ZJERK 0.3
define DEFAULT_EJERK 5.0

Hi! That looks nice project! I started yesterday to print parts of this project and started
thinking about what parts are needed to make only a 3D-printer?

Thanks. You can skip parts 15,16,17,19,lens_cover(last one).

Thanks the many pictures..I'm building my own 3d printer and I enjoyed your pics.

Thanks for Your interest. You can also use a photos and .docx file from first part of the project https://www.thingiverse.com/thing:2781630

Just Another One Mostly Printed CNC (jaoMPCNC). Laser engraver cutter XY 1m x 1m x 0.5m d25 version.
by Enic
Comments deleted.

Impressive !!!...............well done

Thanks, feel free to ask any questions