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Topics - sqweeker

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General Mach Discussion / Totally lost
« on: September 21, 2012, 05:32:07 PM »
I converted CNC Bridgeport,

Mill is set up with Mach3 a USB Smoothstepper and cnc4pc BOB and dugong servo drives.

I kept the original servos and encoders.

The machine has worked great for 9 months then we had an issue with an over travel on the Z axis and killed a servo drive. Hood and Brian helped me out in a different post dealing with the axis issue, but now I have a different weirdness.

Replaced the servo drive and the mill ran for a day and then started doing weird stuff, you could load a gcode program and you could run it several times then it would just stop or it wouldn't run at all. Had to shut down mach and restart and then the same result.

Read some posts and saw several folks had similar weirdness with noise issues. So I bought a ESS and installed that hoping that if it was a noise issue that would take care of it.... NOPE got worse.

Other funny thing was that my Z axis steps were still the same in my motor tuning but the spindle was moving twice as far as it should have DRO showed 0.250" and the spindle moved 0.500" changed the steps to get back to the correct travel.

So I thought maybe something got corrupted in Mach, I downloaded the .066 version non lockdown (Warp 9 suggested .058) but I could not find that on the download page.

As it stands now the mill will let me move all the axis with the jog keys, I tried to do a quicky NFS small program just to test it out, it loads the gcode press start and it gets to the 4th line and just sits there.

Any suggestions would really be greatly appreciated

Thank you,
Ted

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Newbie question,

I converted a CNC bridgeport to Mach and installed dudong servo drives, the mill has been up and running for 6 or 7 months with no issues, until yesterday, when the Z axis over shot the upper limit switch and it seems to have cooked a servo drive.

I tried a search for servo drive and fuses and have found very little information.

Anyone have a suggestion as to how large a fuse to use, the servos are 120volt DC brush type 25 amp max draw.
The drives are good for 160 volts and 35 amps.

Do you fuse for the max motor or the drive and do you use fast acting or slow blow fuses.

Thank you for any help with this
Ted

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