Small CNC Mill - mechanics finished / Projects / Forums

Forums

4hv.org :: Forums :: Projects

« Previous topic | Next topic »

Small CNC Mill - mechanics finished

previous 1 2 3 next

Move Thread

LAN_403

Dr. H.

Sat Dec 14 2013, 06:52PM

Registered Member #931 Joined: Mon Jul 30 2007, 05:25PM
Location: Bulgaria
Posts: 486

Hi guys

not everything is going to plan ...

A cheap chinese transformer went crazy and burnt some of the electronics in the old mill... some repairs were needed .... darn it ... Back and running now but with almost a week delay ....

Nice software Carbon Rod, thanks for shearing

I am planning to play with some 3d printing in the not so near future ... but only plans for now.

Cheers

1387047108 931 FT159100 Img 20131214 124305

Dr. H.

Sun Dec 22 2013, 08:14PM

Registered Member #931 Joined: Mon Jul 30 2007, 05:25PM
Location: Bulgaria
Posts: 486

Hi guys

moving forward on the project - most of the ALU parts have been cut. I will be getting home for Christmas soon so till then I hope to have all parts to start assembling .

Cheers

1387743222 931 FT159100 Img 20131201 160012

1387743222 931 FT159100 Img 20131207 195518

1387743222 931 FT159100 Img 20131206 203430

1387743222 931 FT159100 Img 20131201 200545

Dr. H.

Sat Dec 28 2013, 08:51PM

Registered Member #931 Joined: Mon Jul 30 2007, 05:25PM
Location: Bulgaria
Posts: 486

Hi guys

I am back in the good old big workshop

. All of the parts are cut - time to start the assembly.

P.S. Hmm I didn't imagine soo many parts

Cheers

Dr. H.

Tue Dec 31 2013, 06:03PM

Registered Member #931 Joined: Mon Jul 30 2007, 05:25PM
Location: Bulgaria
Posts: 486

Hi guys

moving forward on the project. The mill is starting to take shape. Cheers and happy new year

Shrad

Wed Jan 01 2014, 08:55AM

Registered Member #3215 Joined: Sun Sept 19 2010, 08:42PM
Location:
Posts: 780

advice for power supplies...

use server power supplies like IBM or HP power supplies... they deliver 12V or 24V at the 50A level, plus other voltages at useful powers like5V 20A, 3V3 10A or things like this

main thing is they are sturdy, deliver top current without sagging, are reliable and have parameter monitoring through SPI, plus their PFC and almost 90% efficiency for the better ones

the latest I had a look for were 12V 50A supplies plus other voltages (600W total) for 6â‚¬ without shipping!

and the form factor is pleasant too... 5*5*30cm :)

Dr. H.

Mon Jan 06 2014, 06:40PM

Registered Member #931 Joined: Mon Jul 30 2007, 05:25PM
Location: Bulgaria
Posts: 486

Hi guys

Shrad - this is a good suggestion. I've spent quite a lot of time looking for a power supply second hand but didn't find anything that worked fine for me and this is why I opted for this one. I've tried a 24V 350W SMPS from a medical equipment but was just too big to fit in the base of the machine. Good idea about the server supplies

To update the project - the X and Z are fully complete (except for the servo shaft extender and pulley - hope to make them tomorrow). Those little things sure take forever (end switches, optical sensors, cable guide ...)

I've done some speed tests and it seems the machine will be able to move in the 4000mm/min range witch is really nice

Cheers

Dr. H.

Thu Jan 09 2014, 08:28PM

Registered Member #931 Joined: Mon Jul 30 2007, 05:25PM
Location: Bulgaria
Posts: 486

Hi guys

The base is almost finished. One of the trickiest part remains - the protective cover for the guides and scew. Will be fighting with it tomorrow and after that final assembly of the mechanics.

Cheers

Mads Barnkob

Thu Jan 09 2014, 09:37PM

Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968

That is some top quality do it yourself right there, I am impressed :)

I have some slide bearings for round rods with a flat side for screw mounting to a plate, I saved those for a possible DIY CNC project. There is 12 of them, so I have for xyz. They are around 40mm long and for a Ã˜20mm rod, (similar type:

) I fear that a rod only fixed in the ends can vibrate too much compared to a linear that is fixed along the axis with multiple screws, do you think there are stable enough compared to a linear bearing?

Dr. H.

Sun Jan 12 2014, 06:29PM

Registered Member #931 Joined: Mon Jul 30 2007, 05:25PM
Location: Bulgaria
Posts: 486

Hi guys

the mill is mechanically fully complete now

. Time to start on the electronics.

Hi Mads - thanks for the kind words. Yes those round rails are really prone to bending and vibration. It all depends what you intend to do with the mill, but 20mm is suitable for small travels (and loads). My big mill uses 40mm rails and the travel is about 50cm (full lenght is about 70cm between supports) and it bends really bad. If you want some rigidity and don't want to spend too much money the supported round rails are a relatively good choice. Much better than the unsupported.

Cheers.

Patrick

Wed Jan 22 2014, 09:05PM

Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639

Masterful, just masterful build.

is that transformer device with heat sinks in the lower left of the pics, your power supply for this machine?

previous 1 2 3 next

Moderator(s): Chris Russell, Noelle, Alex, Tesladownunder, Dave Marshall, Dave Billington, Bjørn, Steve Conner, Wolfram, Kizmo, Mads Barnkob