King Midas mill conversion

[diy-john]

The proposed set up looks good for a backlash of around .015 -> .025mm if you get it right. Plenty good enough to remake the machine after the screws bed in and .025 mm start to hack you off, which it probably will
...
You could reduce it 5:2

Robin, with this rate, the mill will be cutting a couple of atoms per slice - maybe.

So far, added to shopping list some 48 teeth (around 75mm diameter) pulleys, and smaller 24 teeth (around 35mm diameter). Could make it into 5:2, guess it will be a bit more precise then.

No good, why spend more on 70V drivers then use them on only 36V?

Good Jonathan you say that, didn't even come to think about that. Updated into shopping list. So far only found some 50V PSU's, but will keep on looking, to add to the list.

	Shopping list colour codes:
	RED=NOT NEEDED, going DIY
	ORANGE=Maybe not needed (DIY?)
	GRAY=check quantity
	PALE BLUE=Ballscrews+ballnuts as units
	YELLOW=New since last list
ITEM NO.	PART NAME	QTY
1	Nema 23 stepper motor, 3Nm (425 Oz-in)	3
2	PM752 Microstepping Driver	3
3	Power supply 50V – 68V, at least 400W	1
4	Coupling	3
5	MBA motor mount	3
5	Aluminium motor mount	3
6	X, Y, Z-Axis Ballscrew Fixed Support Block, FK-type	3
7	X-Axis 1605 / C7 ballscrew 581mm + ballnut	1
8	Y-Axis 1605 / C7 ballscrew 346mm + ballnut	1
9	Z-Axis 1605 / C7 ballscrew 386mm + ballnut	1
10	Ball nut housing (X,Y,Z-axis)	3
11	X and Y-Axis Ballscrew Floating Support Block, FF-type	2
12	Z-Axis Ballscrew Floating Support Block, BF-type	1
13	Pulley for 12mm width belts. AT5 -type. 24 teeth. Total width circa 22mm. Total diameter circa 37mm. For X, Y, Z -axis	3
14	Pulley for 12mm width belts. AT5 -type. 48 teeth. Total diameter circa 75mm, for X ,Y Z -axis	3
15	Belt 12 mm 12AT5 length circa 450mm, for X, Y-axis	2
16	Belt 12 mm 12AT5 length circa 330mm, for Z-axis	1
17	E-stop switch	1
18	Limit switches	6
19	Connectors for stepper motors	3
20	4-Core CY, 1.5mm^2 cable

http://www.youtube.com/watch?v=tasl9...eature=channel

Nice video Jonathan. Makes it easier to understand how the pulleys are setup.
- 6, 11, 12 ... not quite sure how involved a procedure it is to make them DIY? (and how big a saving can be made, and can one create those without CNC? )

Think the shopping list starts to look quite good (ready to go?). Really appreciate, your help has been great. Thank you!