Light Machine Corp. Benchman XTr (retrofit)

x-Intelitek Engineer wrote: To change the jumpers to make the machine a 3-axis machine, move HDR2 to the left two pins (1-2), for a 4-axis, move HDR2 to the right two pins (2-3).

Don,

Thanx so much for the 3-4axis jumper info. I just ran over to my shop to try it out, and it lit right off with no 4th axis encoder error.
Life is good!!

Rex

Rex,
Just remember that if you run it this way with flood coolant and you get coolant into the unprotected 4th axis connector inside the machine, it is a HUGE PAIN IN THE NECK to clean it out.
Don

Guys, I would like a little input on the 2 sensors, which I am assuming are hall effect detectors. I can get the one on the spindle to go true when rotating the spindle. My plan is to use this as feedback for my tool changing ladder program. The second one, I cannot seem to get to work, possibly its bad. I assume this one is for the power drawbar, but would like a better understanding of the system before tearing it apart. Is there a magnet? Does the spindle need to be oriented? Anyone got an assembly drawing available? Any help is much appreciated.

Mac, if you send me photo of your draw bar assembly i might be able to help you with sensor.
Both sensors on my machine is inductive proximity sensors.
The one that senses drawbar open-close state is very finicky to tune properly, i think i nailed procedure thought that made it working reliably. You may need to remove air cylinder to gain full access to the sensor.
Attached is the drawing i got for my machine, but it does not show sensor.

Thank you, that looks like the right diagram. What did you do to dial it in?

Make sure you have means to read state of the sensor in real-time in your software (kflop makes it easy)

Install tool holder into the clamp.

Then remove air cylinder for draw bar (4 larger and long screws) it will give you access to the sensor wire and sensor itself (wire is clamped by small flat plate which is easy to remove)

Once air cylinder is removed then locate tiny set screw on the side of draw-bar assembly that is pressing to the body of the cylindrical pickup sensor (it is inside one of the holes on the side of the assembly), you need to loosen it and then you can move sensor wire by hand.
Pull or push sensor by holding wire just tiny bit until it indicates draw bar clamped state. Important to get it right on the edge of sensitivity, if it is pushed in too much washer will rub on it or it will not sense draw-bar open.

Very gently and lightly tighten set screw, sensor has very soft body and set screw can push into it easy.

Having tool holder installed will leave enough clearance for washer to get closer to the sensor in case you close draw-bar without tool holder in it. I found that if i calibrate without tool holder then sensor can be too close to the washer and will not reliably sense washer away state when draw-bar is opened.