What does everybody use for teaching uframes? I have seen custom pointers made with fine tips. These are expensive. I was wondering what other people are using ?
Pointers
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jrv5207 -
August 27, 2018 at 2:23 PM -
Thread is marked as Resolved.
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For user frames, we have ziptie'd a pointed metal rod to the end of the welding torch and used that. Basically anything that will remain stationary relative to the robot faceplate long enough to teach the frame is fine. Just be sure you have the tool frame for whatever you are using taught accurately. If it is a one time deal, it can be as wibbly wobbly as a zip tie, but if you ever need to re-teach the frame, move the frame, or duplicate at a different orientation (one robot tending two otherwise identical machines), it would be a problem.
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While I've seen (and done) Robo_Eng_13's method, I prefer (if I get on the project early enough) the custom pointer method.
For the price of one threaded hole on the tool, and a custom made pointer, you end up saving that cost in manpower time when the cell is installed on the customer's floor (mainly in idle time of other people waiting on you to finish touching up your frames).For very precise systems, I've setup tooling balls on the machine, and used dial indicators to get as close to an ideal frame as possible.
On other systems, I've worked with laser tracker teams to shoot the robot into the car's body space coordinate system.
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Thanks for the replies Robo_Eng_13 and Nation.
I have used the zip tie method before. Hero what specs do you use to make a custom pointer. 6 in rod with a point on one end and an m6 or m5 threaded end?
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Take a weld tip that you will be using in the cell and fit a dowel pin into it by drilling the hole out of the tip and pressing the dowel pin into it. Drill and tap a hole for a set screw on the side wall of the tip to keep the dowel pin in a fixed position. If you wanted to, then grind down the tip of the dowel pin to a fine point.
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That is actually not a bad idea. A custom weld tip would be much easier than a full tool. I have been meaning to have a marker tip made, and i may add this to that as well.
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We use a combination of a steel frame with milled dots at the center, X and Y extremes and a pointer that's a combination of a fiberglass rod w/ a 3d printed adapter for the spray gun.
Makes it easy to set up the frame to where our cart will be located (and replicate between cells!), and also easy to check drift.... just run the bot out to 0,0,0, install the tool, and measure the drift.
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Small drill bit pressed into weld tip is my go to
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I use a laser with a distance reading on it and a special target. It works well for userframes but is a bit expensive.
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For most situations I like using the 6" rod, sharpened on one end, threaded on the other.
For more critical situations I will use a dial indicator to make corrections.
The key to me is a repeatable method that you can do again if the machine is moved and get the same results. So that excludes zip ties.
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