Doddy
31-03-2016, 07:35 AM
Before I post off to china, I thought I'd ask here first:-
I'm building a laser-scanner / pre-sensitized PCB exposure unit (old polygon mirror assy from a laser printer, 450nm laser diode, etc). The scanner unit provides the X-axis positioning of the beam, the Y-axis I'll need a sled, that holds the PCB to be exposed. Bed geometry is nothing special, and I'm flexible with size at this time, but I'm thinking no more that 6". Bed is likely 4mm ali-plate, holding nothing more than a few tens of grams of laminate PCB stock. It would be stepped, delayed, laser line-rastered, delayed, rinse-and-repeat, so absolute positioning is fairly important but there would be low dynamic forces.
So... nothing spectacular then.
What I'm after is the hardware to support the build of the Y-Axis - rails (say 12" length), screws, nuts. All light weight, and with the Y-Axis travelling in a single direction without significant opposing forces, then little concern for backlash (so trapezoidal screws would be considered).
Has anyone any light-weight kit lying around that they want to get rid of for cash?
Note: I'm really not after high-end stuff here - if no-one has anything lying around I'll probably just replicate the axis from a RepRap. Or buy chinese 12mm supported rail and trapezoidal screw/nut/stepper.
I think I'm sorted now, thanks to all that read.
I'm building a laser-scanner / pre-sensitized PCB exposure unit (old polygon mirror assy from a laser printer, 450nm laser diode, etc). The scanner unit provides the X-axis positioning of the beam, the Y-axis I'll need a sled, that holds the PCB to be exposed. Bed geometry is nothing special, and I'm flexible with size at this time, but I'm thinking no more that 6". Bed is likely 4mm ali-plate, holding nothing more than a few tens of grams of laminate PCB stock. It would be stepped, delayed, laser line-rastered, delayed, rinse-and-repeat, so absolute positioning is fairly important but there would be low dynamic forces.
So... nothing spectacular then.
What I'm after is the hardware to support the build of the Y-Axis - rails (say 12" length), screws, nuts. All light weight, and with the Y-Axis travelling in a single direction without significant opposing forces, then little concern for backlash (so trapezoidal screws would be considered).
Has anyone any light-weight kit lying around that they want to get rid of for cash?
Note: I'm really not after high-end stuff here - if no-one has anything lying around I'll probably just replicate the axis from a RepRap. Or buy chinese 12mm supported rail and trapezoidal screw/nut/stepper.
I think I'm sorted now, thanks to all that read.