Wednesday, February 21, 2007
So that makes pic programmer and comms unit working. I have my stepper motors. Nichrome 80 is on order. Some teflon blocks on order as well. A little index card box houses my chips and sockets and various electronic sundries. Oh, and I got a lighted magnifying glass so I could see what I was doing with small stuff. You young guys will know what I mean in 20-30 years. I have a drill press and cross slide vise coming in a week so I can do some simple milling/routing to make the extruder. If I can drive the vise with steppers I can try doing some milling of copper clad and quit doing this ugly perfboard stuff. But that means I'll have x and y stepper controllers already working. Well there is always the next version, and anything else I ever make. I'm getting excited.
You could 1N4148 diodes.
The "simple" version does not meet RS232 standard levels so expect problems with laptops.
The "better" version requires the PC to set RTS high and DTR low or vice versa so may need software mods.
If so, let us know how that turns out, it could be a useful way of RepStrapping.
What are you using as the spindle for milling? (Drill spindles aren't designed to handle lateral forces, just up-and-down forces.) You may want to mount a laminate trimmer or rotary tool on your vertical axis for milling, rather than using your drill. People like the proxxon brand rotary tools for homebuilt cnc machines.
Anyway, with some carefull fiddling, I've managed to mill a few keyways in mild steel shafts when desperate. Cheating by bracking things against the flex really helps!
Also, dismantling and polishing a cross-slide can go a long way to smooth out its action. I believe tips on doing this could be found wherever machinists gather on the net.
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