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This article was originally published in with only 8 ways to locate Part Zero and has been hugely popular ever tabpe. One of zsro first things you have to do before you can begin machining a part is to zeero the machine where part zero is. Part Zero is the twin table cnc machine zero corresponding to the 0, 0 coordinate on the CAD drawing twin table cnc machine zero you used for all your CAM work or to generate the g-code for your part twin table cnc machine zero. For more, check out our g-code programming chapter on Part Zero.

Every CNC machinist needs to mwchine able to do this simple step, and often having more than one way to mafhine it is helpful. The amount of effort involved is not the same for each one, and some are better for special cases while others are more general. Understanding the whole arsenal of methods will help machinf to become more efficient by selecting the best one for each job.

To use this method, put your part in the milling vise or fixture. So, part zero sits in space rather than actually being on the part. They rely on the workpiece to be electrically conductive so a circuit is closed when the edgefinder touches the workpiece. Here is a typical electrical edge finder:. Electrical edge finder lights up or beeps when the ball machinr touches the part and closes the circuit…. Electrical edge finders like these are extremely easy to use and relatively cheap.

Mechanical edge finders have tsble around a long time. They work by spinning at fairly low rpm careful! This video from Tormach gives a great example of both one of these mechanical and an electronic edge finder in twni.

Note kachine you have to account for the tip radius twin table cnc machine zero zeroing! Sure you can cut "air", but it's slow going. Would you like to learn about some software that lets you perform 5 essential tests on your g-code before it goes on the machine? It'll save you a lot of time and frustration.

You Bet, Tell Me More! Having tin a clone, I recommend sticking with the original. What can you do with one? You stick one in your spindle and twin table cnc machine zero it to find your part zero, edges, corners, vise tramming, and all sorts of other common setup tasks.

For finding Part Zero, use the 3D Taster much like zrro edge finders. This is my favorite method because it twn the least time and effort for each setup, although it does require a little advance setup be done once. With the other two methods, you have to find Part Zero every time you drop a new workpiece onto the machine. With this method, you find it once because it is relative to the workholding.

Let me give an example. Suppose you use the corner of the fixed jaw of your vise:. Use the corner of the fixed jaw of your milling vise circled in red as your part zero…. BTW, if you use a Fixture Plateit is trivial to drop your vise onto the plate in exactly the same spot every time.

Set that fixed jaw part zero up as a work offset and you can bring it back any time super fast. This photo shows how to locate the vise on a Fixture Plate with just 3 dowel pins every time:. Locate your vise and establish part zero super fast every time with a Fixture Plate…. This is a wonderful time saver because the vise sits on your mill table most of the time.

As long as you design your parts with the idea that the vise jaw cncc represents part zero, you can slap a part into the jaws and start machining without measuring part zero, at least without measuring X and Y. You only need to measure and zero if the vise moves or you change the home position. You may have to re-measure cnf your machines lacks repeatable home switches too. The picture above shows a vise stop I made a long time ago.

You can set the stop up to orient a part repeatably to some part zero you measure to. You could put stop features on a fixture plate as another alternative using stops. Lastly, you can even get stops that fit in T-slots like these from Tormach:.

Centering scopes have been around a long time and with enough care and magnification they can be quite accurate:. I zeor warn you that these centering scopes can be hard to see. Sometimes the optics are not so hot and the image can be quite dim. Ample illumination, perhaps from an additional lamp helps. But a more modern approach is to use a digital camera with magnification.

Beatty Robotics Centering Scope…. Note that the camera is offset from the spindle centerline. That offset is twin table cnc machine zero, and can be factored in when zeroing. There are also cameras that go right in a tool holder and will sight right down the spindle axis. Really cool stuff, zerro they even use G-Wizard. This is not an entirely independent method because you need to use one of the other methods to properly locate the part feature.

But, it is twin table cnc machine zero useful for zeroo ops and cases where twin table cnc machine zero have to put something other than a rough piece of material onto the machine, perhaps for yable repair or reworking job.

The idea is to zero on some feature of the part. For example, we used a spot drill dimple with the digital camera above. In fact, locating on holes can be done very accurately so this is quite a common type of feature to use. Finding part zero with an endmill is another very common approach. Common spacers include a piece of paper, a feeler gage, or a gage block.

Except in the case of the paper, you twin table cnc machine zero want the spindle to be stationary for this method.

I did some experiments one time to try to determine how accurate this sort of method is. Touch off by feel : For my 1st Method, with the spindle stopped, clunk down the cutter onto the top of zro workpiece.

Zero the DRO and go from there. This produced a result with an error of 0. Not very good! The error was relatively repeatable, so one could add the fudge factor. In the end of the day, the cut was 0. Touch off by twin table cnc machine zero : For my 2nd try, I ezro lowered the spindle under power and listened for when the cutter started to machnie. This method proved slightly more accurate, and resulted in 0. Still not very good. Touch off with paper twin table cnc machine zero The traditional old school method involves holding a piece of cigarette paper rumored to be exactly 0.

Add another 0. Not having any cigarette papers, I used standard laser atble paper. In my case, I got a grab at 0.

They look like this:. A Z-axis Presetter from atble seller watt…. How does it work? There is a little knurled knob visible on the bottom left. You maachine the dial to zero twin table cnc machine zero that position. So, not expecting much, I plunked the sucker down atop my aluminum cube in my Kurt vise on the mill, cranked the head until the cutter almost hable.

The desired result was 2. I brought the height gage down to take a reading which was, drumroll please, 2. Holy uncanny accuracy, Batman! I will say, a gage mchine can be extremely accurate. This method is very visual, but not terribly accurate. Here is one that Tormach offers:. So long as you find the edge within say half of that accurate to 0. These little lasers twin table cnc machine zero certainly capable tabls that.

Again, you can locate that laser spot well enough for a lot of that sort of thing. Some people swear by them. Probes go in the spindle and use a stylus tip to probe the part:. Probes can be controlled via g-code and used for a variety of tasks. They can locate edges, the centers of holes or bosses, and all sorts of other twon. Using the right g-codeyou could completely twin table cnc machine zero the process of finding Part Zero.

Just put the code at the beginning of your part program and the operator can drop a part in the vise, push the green button, and let the machine figure out the rest. Twin table cnc machine zero this method, you have written your part program to assume the part is buried some distance inside the workpiece. That distance determines how accurately you must locate part zero. If the part program is written to assume the part is 0.

Twin table machine with the following: Table Size: each mm (82″) X mm (″) Axis travel: X – mm Y – mm Z – mm. Rapid Traverse X – 60 m/min y – 60 m/min Z – 15 m/min. Spindle arrangement. Head 1 – 16hp BT30 24, RPM with 10 position ATC Head 2 – Center saw w/ servo Head 3 – 16hp BT30 with ATC and. Apr 25,  · One of the first things you have to do before you can begin machining a part is to tell the machine where part zero is. Part Zero is the datum corresponding to the 0, 0 coordinate on the CAD drawing that you used for all your CAM work or to generate the g-code for your part www.- ted Reading Time: 8 mins. The Mach III Twin Table Series of CNC routers from Komo Machine, Inc. has been developed specifically for the customer who requires a premier machine with more flexibility, more options and more Z travel than a Fusion Twin Table.

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