Thread: Closed Frame Machine Design
I'm going to make CNC machine prototype - I need it to be closed frame because that will be easier in the control design because I'm going to use servo motors instead of stepper motors
So I need closed frame design that i can build and apply the control I will design on it
Any help is welcome, I mainly need small mechanical closed frame design
I need design ready and tried cause my major is not mechanical engineering and i need this task (mechanical body) to be easy
And finally closed frame word is not my own description
I got it from book >> this is the chapter described that part https://drive.google.com/open?id=0B1El2XHLhbSCU1hYX1hTbUZfeVE
Any clarification will be helpful
I really thank you for your reply
OK. So a 'closed frame' is a 'fixed gantry' and an 'open frame' is like a conventional milling machine.
Good example of a 'closed frame' here, first picture in post#1
But there are not many fixed gantry machines on this forum, most are another type with a moving gantry to cut bigger pieces. But have a look through the build logs:
The gantry is the large fixed frame connected to the bed, in the shape of an arch. It does not move.
The X axis carriage moves the Z spindle plate left to right on this fixed gantry.
The Z axis spindle plate moves the spindle up and down
On the bed the Y axis plate moves the workpiece left to right.
Hope that helps.
Here is diesel's [closed frame / fixed gantry] machine:
Here is Wals' [open frame / mill style] machine:
(If you are going for max performance then use profile linear rails (Hiwin etc.) not supported rail.
The way i see it your best bet is to make a simple fixed gantry machine from aluminium extrusions like the one at the picture bellow
And maybe make it more miniature and enclose it like that:
So at the end you finish with a benchtop CNC.
My advice is thought to use at least round supported rails /SBR, TBR..20 size/ , even better, Hiwin 20 / much more expensive and better/ and 0.8kw water cooled spindle. Use also 3nm nema 23 motors and Am 822 drives, PSU for motors non regulated at 70VDC
I mean when you will be spending money make a real machine that will later have some value. Otherwise go ultra cheap all in one board with drives, 24v motors, PC ATC power supply , nema 17 motors. A micro CNC, similar to 3d printers. The middle way between what i am suggesting, is to spend your money for nothing.
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