Edge finding with the V2-50

[cedric....@gmail.com]

If "the edge finding tool holder is not compatible with the V2-50", then what are ways to go about edge finding with the V2-50?

[Graham Stabler]

Personally I don't do any. If I am machining something from raw stock then I ensure it is positioned correctly and there is enough extra material, for bar stock I am making a height setter a bit like those used for wood routers so it is easy to make it extend the correct distance from the collet.

If I need to machine something that already exists, say for a second operation then I machine a fixture to hold it. I'm also looking at creating some sort of soft jaw system for the same sort of thing. The sacrificial plate that PocketNC sell can be used for that sort of thing too, machine some features into it and then clamp the part to it.

I also made an ER20 collet fixture that can be centered with a dti for a specific job.

Other than that some thin shim and a dowel is about the only way, someone was looking at adding a probe but it needs to be very repeatably mounted. 

An example of a fixture: https://www.instagram.com/p/B2l9hRdJcRr/?utm_source=ig_web_button_share_sheet

My ER collet: https://www.instagram.com/p/B3Jfme6pgZr/

Cheers,

Graham

[David Farmer]

You can use the tool and a piece of paper as a feeler gauge. The only trick is the z height doesn't correspond, unless you can do some math. Instead I turn the table 90 degrees and use the side of my tool as well. I've also used a small test indicator mounted in the spindle to find the location of circular parts.

I Also use an er32 collet chuck that I have pinned. holding a gauge pin its less than 0.001 off center. I correct for this in my template that has the table and this fixture.

All this being said, I've found the repeatability to not be that great, especially with the tool height. remember these are not servos, just simple steppers.

[Graham Stabler]

I think the issue with tool height is using a push switch as the sensor, steppers are super reliable if not overloaded. Tool pullout can be an issue, depth stop rings are not a bad idea so you can at least see it if it happens, it also prevents push-in when plunging.

Graham

[jen...@gmail.com]

I do a touch off. Turn the spindle on to 200 rpm, use the jogger or MDI to move the tool near the top/side of the part. Touch the stock and/or listen for a chatter as you jog closer. Once you hear the chatter, back off by 0.0001 until you no longer hear it. Repeat to check your sanity. Record where the x/y/z position is. Do the same for a location on the table. Use the distance between them to accurately create put the location of your stock in fusion. 

[Adam Lange]

For now I use a 0.100" gauge block to measure between the a pin in the spindle and the part.  I'm working on integrating a touch probe: https://hackaday.io/project/170009-pocket-nc-touch-probe-integration

[cedric....@gmail.com]

Thanks for your responses!