PDA

View Full Version : BUILD LOG: Hi newbie looking for advice



bluebug
03-08-2016, 10:13 PM
Hi all,

I'm looking to build a CNC router

The bed will be made from 40mmx40mm T section steel with slotted idlers running on the outer edges (for now :unconscious: ) for the gantry, and similar for the y axis gantry

bed size is 1200mm x 600mm (so i can get a full 1000mm x 500mm cutting are)

I've seen on the net a motor kit, NEMA 23 motors (1.8 step 178.5 oz inch)
DM542A driver
350w 36v 9.7A switched PSU

now will this set up be ok the motors will be driving a belt two to one reduction gear then timing belt for the x and y axis
and a screw for the z axis (200mm)

thanks mark

njhussey
04-08-2016, 06:52 PM
Hi all,

Hi and welcome to the forum!!


I'm looking to build a CNC router

Well there's plenty of info on here for inspiring your build so you've come to a good place!!


The bed will be made from 40mmx40mm T section steel with slotted idlers running on the outer edges (for now :unconscious: ) for the gantry, and similar for the y axis gantry

Not ideal as will need machining to get a decent flatness but depending on what you want to cut (what do you want to cut?) will probably be ok.


bed size is 1200mm x 600mm (so i can get a full 1000mm x 500mm cutting are)

Doubt you'll get 100x500 out of the dimensions you state, it's amazing how much room the gantry and Z axis take up. My machine is 1300x850 and I get 970mm x 500mm (just!) but that's because of the design I went for!


I've seen on the net a motor kit, NEMA 23 motors (1.8 step 178.5 oz inch)
DM542A driver
350w 36v 9.7A switched PSU

now will this set up be ok the motors will be driving a belt two to one reduction gear then timing belt for the x and y axis
and a screw for the z axis (200mm)

thanks mark

Generally motor kits are not matched very well, the motors tend to be high inductance and the PSU underpowered resulting in a slow machine. You're far better off buying separate items which the lads on here can recommend.....but only really worth doing that when you have a design up (which we'll happily critique) and say what you realistically want to cut.

bluebug
04-08-2016, 08:56 PM
Hi and welcome to the forum!!



Well there's plenty of info on here for inspiring your build so you've come to a good place!!



Not ideal as will need machining to get a decent flatness but depending on what you want to cut (what do you want to cut?) will probably be ok.



Doubt you'll get 100x500 out of the dimensions you state, it's amazing how much room the gantry and Z axis take up. My machine is 1300x850 and I get 970mm x 500mm (just!) but that's because of the design I went for!



Generally motor kits are not matched very well, the motors tend to be high inductance and the PSU underpowered resulting in a slow machine. You're far better off buying separate items which the lads on here can recommend.....but only really worth doing that when you have a design up (which we'll happily critique) and say what you realistically want to cut.



Hi thanks for the advice, the router is to start off with just for me to get use to router/software as time goes by i hope to improve/modify ill will be only cutting MDF / ply and speed isn't a issue,

thanks mark

njhussey
04-08-2016, 11:24 PM
Hi thanks for the advice, the router is to start off with just for me to get use to router/software as time goes by i hope to improve/modify ill will be only cutting MDF / ply and speed isn't a issue,

thanks mark
No problems Mark, get a design drawn up for everyone to look at (it's surprising the little things you don't think about that others who've done it before know about) and take it from there. Don't buy anything until you've got your design finalised, especially the electronics, as things can change quite alot...[emoji2]

P.s. unfortunately you need speed to cut wood....unless you've a slow spindle.

bluebug
06-08-2016, 10:07 PM
Hi thanks for the info,

what is the ideal speed for the x and y axis if cutting MDF/Wood/Plastic/light metal?

As to software has anyone any recomendations for a MAC

njhussey
06-08-2016, 10:28 PM
The ideal speed will depend on your spindle speed and also machine rigidity so is difficult to say. I cut acetal at 18k rpm and 6500 mm/min...

bluebug
06-08-2016, 10:31 PM
I have a idea of what i want plus a few sketches just now trying to find a cheep (free) cad program for the mac computer

then i will post my designs :)

njhussey
06-08-2016, 10:35 PM
I have a idea of what i want plus a few sketches just now trying to find a cheep (free) cad program for the mac computer

then i will post my designs :)

For 2D you can use Draftsight, 3D and CAM try Fusion 360. both are free and both can (I believe) be run on a Mac.

bluebug
06-08-2016, 11:34 PM
Wow that fusion is a little out of my price range (for now)

njhussey
06-08-2016, 11:36 PM
It's free!!!

bluebug
06-08-2016, 11:37 PM
only for 30 days then 29 a month or 299 a year

Boyan Silyavski
07-08-2016, 05:23 AM
For 3D CAD Sketchup, free plugin to export to dxf. Or Freecad could be even better, as its parametric. There are many free 2D CAM . For CAM Estlcam (http://www.estlcam.com/)

http://www.hongkiat.com/blog/free-cad-software/

Neale
07-08-2016, 09:12 AM
only for 30 days then 29 a month or 299 a year

You sign up for the trial and at the end of it, you get the opportunity to sign up for a hobby/home use licence which is free.

bluebug
30-08-2016, 11:41 PM
Thanks for that Neale just signed up
now back from hols i can start building :)