Hello everyone, well after making my first router type cnc machine on a budget ive decided to push the boat out and make a milling machine based of a sieg x3 machine.
The machine is going to be a bit larger than an x3 and hopefully far more rigid.
linear rails on all axis
DQ860MA 80V Drivers
yet to decide on powersupply
3.0Nm on X and Y nema 23
4.5Nm on z nema 34
2.2kw spindle to start with and hopefully BT30 spindle with ATC in the future.
Pictures to follow:
Hopefully this is what it will look like: Nearly fully Drawn
Ears welded up to support the z axis
Z axis sides, 20mm thick:
The z axis fully built ready to be surface ground:
Surface ground and holes drilled and tapped for the ears:
Just checking the squareness: looks pretty good although this is adjustable on final assembly:
Steps machined for linear rails and ball screw supports and nut:
All holes drilled for linear rails, ball screw supports and the screws which will push them towards the parallel edges:
Y axis plate machined and holes drilled ready to mount the rails and then surface ground:
Last edited by totts; 25-06-2014 at 08:57 PM.
This is just a test piece to check how well the taper locks up: was pretty good with just letting it drop in under its own weight, it would stay in when held upside down, and with a tap of a mallet i wasn't able to pull it apart by hand :)
Adjustable gas strut to help with the weight of the heavy z axis:
That's all for now apart from the rails and ball screws that everyone has seen before, material for the bed has been ordered and hopefully will be starting this soon :)
Hopefully everyone likes the build so far!
Last edited by totts; 25-06-2014 at 09:02 PM.
Very nice and definitely will be following this build.
There I was at lunch time today browsing through google images at other peoples mill type builds (shortly after reading through JBs x3 conversion thread), i'm keen to have a go at my own mill type, is it obvious yet?
Then I jump on tonight and I find this gem of a thread! Yea! Perfect timing, cant wait for the rest totts !?!
Starting to look very purposeful. Well done. G.
Thankyou, lots still to do, everytime i think about it theres more to do! :(
I have a nice solid slab of aluminium as shown in the drawing, about 500mm x700mm by 76mm thick so i hope this will be solid enough.
I was going to fit some of the electronics into the colomn but i am now going to make a stand to house the spindle cooler, electronics, pc and coolant pump, so will probably think about filling the column with something after the z stepper and y stepper is mounted so i know where to fill.
Trouble is the cost keeps mounting up :( best not to take note and hide the reciepts from the missus hahah
Last edited by totts; 26-06-2014 at 01:00 PM.
Good start - almost getting jealous!
A few general observations...
Have you seen the BT30 ATC spindles on Aliexpress? If you're happy with 6000rpm then they're not excessively expensive:
PSU - why no decision? A toroidal transformer of around 500VA would be ideal.
What is the mass of the Z-axis (head, spindle etc) and what are the dimensions of the Z-axis ballscrew? I've made a script to calculate it more accurately, so if you post that information we can make sure the motor you've chosen is the best option. I suspect you may be OK with one of the 3-4Nm Nema 24 motors. The gas strut makes surprisingly little difference if you try to get a reasonable acceleration...
Correct me if I'm wrong, but it looks like you're leaving the back of the Z column open, so it's a C-shape section not a box? If so then you should defiantly put another plate on the back, as the torsional stiffness of a C-section is very low compared to a box. That's one of the big advantages of putting the ballscrew on the front of the column, not inside - you can have a closed section.
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