So what you really need to know is that the maximum feedrate you can cut at is really the slowest your machine is going to go. You can hear this in the cut as you're machining a square, it has a great cutting noise rrrrrrrrr, then it starts screeching as it reaches the corner, rrRRRREEEEEE, that's what's happening. The problem is that during your deceleration your feed per tooth is dropping through the floor, which means the tool is not cutting anymore, it's essentially grinding which will put a ton of heat into the part, melting the aluminum/plastic and welding it to the tool which then fuses with the part, cools, and grabs the part and chucks it at the operator. Your machine has to start decelerating your X at some point (depends on how fast you can stop) and it has to start accelerating your Y once the X is stopped (or near stopped, which will round the corner). Let's say you're clipping along 60 IPM in the X, and now you need to do a 90° turn so you're moving 60 IPM in the Y. The real kicker comes in from acceleration & synchronization of your linear axis, and this is where most people start breaking tools or throwing parts, especially while roughing. Of course, you're going to be limited by speed & rigidity, but the numbers scale as far as your machine will allow you. It's written as Fz for Metric (mm/tooth) for some reason. The load being put into the material & tool is the same. 002", it doesn't matter if you cut at 5 IPM & 800 RPM or 120 IPM 20k RPM. That means, if your machine can take the load of cutting this. If you're comfortably cutting that, and you have a 20,000 rpm spindle, you can speed up to 120 IPM and maintain the same tool load (120/20000/3 =. For example, if you're cutting aluminum 60 Inches Per Minute (IPM) 10,000 RPM with a 3 flute cutter, you're seeing. Once you figure that out, you can max out your feedrate or spindle speed and maintain that # comfortably. The most important number is Feed Per Tooth for your tool & material. So one other consideration to make your calculations a bit easier (maybe! :)) I also added a fan to clear chips, and the machine is currently finishing the door handle bracket I'll post results when it's done. It's also making actual chips instead of just aluminum dust now, which I'm assuming is a good sign. I think I can finally increase the feed and speed (I've been running at 60mm/min). I just assumed it was cheap or incorrectly machined.Īfter clipping the collet in correctly and putting a new bit in, the 3018 has never been happier! It's much quieter, running WAY more accurately, and the surface finish has improved a ton. Turns out the nut's first lip is meant to clip onto the collet, while the second tapered face is what actually applies the clamping force. The original spindle came fully assembled without the ER-11 collet snapped into the nut, so I just assumed that's how it was meant to be used. I looked everything over a bit more closely, and, uh, I'm an idiot. So I put a new end mill in (I'm using three-flute downcut end mills) and realized while tightening the collet that it was just barely out of true. Turns out the aluminum and/or the spoil board is higher in the center, and a. Employment Opportunity / RFQ (Request for Quote).After successfully completing the inner contour machining, the little 3018 started working on the outer perimeter of the part.Quick Navigation General MetalWork Discussion Top I can try and figure out more if it's needed. No access to coolant, have to do this dry Speed: currently set at 3000 (based on some online calculator I found)īit: 1/8" I don't know anything else about it the bit Any help would awesome.ĭimensions of piece: 8 3/4" long, 3/4" wide, 1/8" thickįeedrate: currently set at 4 (based on some online calculator I found) I've tried a few things but have broken every bit so far and haven't made it more than a 1/2 inch into the first cut. I've already written my gcode and everything looks fine, my only problem is that I have no idea what speed my spindle speed should be, what the feedrate should be or even what kind of bit to use. They are already cut to the length and width, I just need to cut out the dog bone shape. The ones I'm starting with are 6063 aluminum. (that's how new) Anyway, now I've been tasked with creating tensile test dog bone samples. I successfully made my first piece out of plastic using the tutorial in the operator's manual.
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