Sherline 2000 CNC - Part 2

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z-axis.jpg (15152 bytes)

I replaced the z-axis with a 3A version of the driver board.  It's still driven by the same 24V 1A supply.  Eventually, I'll put a higher voltage/amperage supply on that axis.

Also I added an "enable" switch to the board.   Pushing it back turns off the z-motor.  Handy for doing a test run without the end mill going down into the workpiece.

The more significant change is that I made another interface board.

cnc-4-top.jpg (21064 bytes)

I know, it looks similar to the old one, but the control lines that go to the driver board enable inputs are different.  The three axii are enabled/disabled independently via the control port bits C1, C2, and C3.

I modified Stepster to enable only the drivers that are necessary for the specified line of g-code.  It makes an incredible difference in keeping the motors cool!

12-2-2001

Another day, another breakout board!  I started using EMC, and EMC uses yet another pinout.

cnc-5.jpg (15842 bytes)

I have to dive into the EMC source code and see how to add automatic axis enable to it. But that has to wait until I get a computer to dedicate to Linux/EMC.

sher-delrin.jpg (16439 bytes)

sher-delrin-closeup.jpg (25759 bytes)

Fun with Delrin!

Delrin is Dupont's brand-name for Acetal.  It's an easy-to-machine plastic.  Doesn't melt, cuts smoothly, very strong.  Costs a fortune (stocked by McMaster-Carr).

The only problem I had was figuring out how to hold it down while milling.  Tried double-sided tape, which was messy and unreliable. 

Ended up sandwitching the Delrin between an aluminum template and a 1/4" aluminum backplate. Works great!  The cutting has to be done in two passes, otherwise the piece moves around too much.

 

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