Originally shared by Frank Herrmann More Feed! During to develop the XDisPlace project i

Originally shared by Frank Herrmann

More Feed! During to develop the XDisPlace project i have to know, how fast can i make a touchprobe. A lot of people are worry about your expensive Endmill’s and don’t want to test this.

Ok, here my small experiment. I used a rubber-foam block, very thin Copper tape, broken sharp endmill and strong nerves :slight_smile: I glued the block with copper tape on my worktable and test touchprobes via Touch-Plate Widget with different feed speed’s. If the speed to fast, then we will see a hole or a point after probing.

Speed’s: 2000, 1000, 800, 600, 400, 200, 100 mm/min

My Target, see what is the highest feedrate for toucprobe w/o broke my endmill at a hard surface?

Here my Results on the second photo: the best Feedrate w/o Hole or point if between 100 and 150 mm/min … in the next days i make some test with an mdf or alu/steel surface.

Am i the only person thinking where is the spindle connection?

@Ritchie_Wilson I use my Spindleblocker machanism from XATC Project to connect the spindle shaft to the GND wire.

Oh that pretty nifty. Thanks

Nice test Frank. Good idea to use copper tape to be able to “see” how hard it’s pressing.

I really like the idea of having a soft block for probing. I do get worried about not having the probe stop and always do an air run first to make sure it’s working. What would be nice is a more rigid conductive layer than yours but with the rubber backing. I also want it as that corner block so I can do 3 dimensions.

I would place a push button switch below the touch plate (connected parallel). If the touch is not detected, the button will detect the push and stop the move. The tool will not brake because the button is spring loaded.

PCBs are easy, flat and stiff touch plates.

I suppose the part the scares me is that my wire connections are off and thus a push button, which is a super creative idea, would still fail me if the voltage just isn’t being driven through. I guess having an LED showing I have active touch voltage would help too.

@cprezzi I’ll use this “touchplate” for my automatic toolchanger, i need a more simple solution. I want to put this coppertape on the surface of my workpiece. The position is close to the zero point of the workpiece and i can check the Z-Axis-Zero after every tool change. Just an idea.

@jlauer Also it’s possible to use a button switch: http://www.ebay.com/itm/311183529119 (you can get this also with an LED ring :slight_smile: to make a tool-length-sensor, but sadly tinyg don’t support the G43 command at this time for tinygv8: http://www.tormach.com/g43_g44_g49.html
http://www.ebay.com/itm/311183529119