On the first couple of Building Block parts in the Academy (Titan-1M, Titan-2M,) there is still material on the bottom of the part (material that was in the vise) that needs to be removed after the first set up. I presume you would flip the part over in the vise and machine the leftover material off to the finished part dimension. I was wondering what is the best way of doing this on the programming side? I’m thinking that it would have to be a new “set up” with new “stock” material, how do you handle this in the software? I looked for a video or other instruction about this on the website but didn’t find anything, if I missed it please point me to it.
If you are using a Probing System on your mill, when using Model Box Top in the CAM, I will probe the Z0 then deduct the top material at the CONTROL. Is that correct? So in flipping for Operation 2, I will again use MODEL BOX TOP for the flipped setup, probe for Z0 and then deduct the 1/4 inch or so of Operation 1 Z-Bottom material at the CONTROL.
I just checked Titan’s Set up sheets and answered my own question. Sorry, I should done that first. The operator adjusts the offset to the MODEL from the probed STOCK at the CONTROL. That makes total sense.
Titan seems to always set the heights to MODEL TOP. On the flipped side (bottom side), I am using STOCK TOP for the facing to remove the extra material. I then switch to MODEL TOP for the rest of the operations. Is this what Titan does as well? Or does he still use MODEL TOP and add the extra stock in the OFFSET field in fusion360?
How do I get a consistent part dimension when the stock can vary in thickness? I ran the facing operation on the bottom side with “stock top” as my top reference. But because the actual stock was about .020 thicker than what was entered into HSM as stock dimension, it didn’t cut all of the material away. The part dimension is off by .020. So without measuring every piece of stock and adjusting the offset, how do you get a consistent finished part dimension?
@NathanCobb. Set your WCS as Model Top. Did you face off .020 at the beginning of the part? If so you will have .230 stock left on the bottom. I attached a picture showing the .230 stock on the bottom which is now the top of the part for Second Operation. You will have to offset your Z height .230 if you set WCS Origin as Model Box Point.
Awesome!!! I am looking forward to the five axis stuff. The shop I’m in does a great deal of 5 axis work. Keep up the good work. Practical Machinist Forum had some things to say but always remember, The devil is always lurking and will try to hurt anything that’s good!!! I am proud of the work you’re doing!! Keep it up!!!
Whenever I do 2OP setup on any flat bottom part, I simply use the bottom plane of the part as a Z0 reference in Fusion.
For facing OP inside this setup, I use stock top as top height, and model bottom as bottom height.
Then just measure the zero point from the paralels or surface that you put your part on in the machine.
Titan,
What if my stock overhangs all edges of the part .50 on all sides. Would I use Stock Top for set up or still use Model top? If I am using soft jaws would I set my G54 on the left rear corner of the jaws and use the top of my stock for my top?
I have my students use the hard fixed jaw as the Y zero and a stop on the left hand side of vise for the X zero. I set the part on a parallel. I then have them set part zero for Z at .750" above the parallel face. Remember to add .230" on top of Z top for material to be removed in Fusion. I then program my part origin to be at the model point corner. There are other ways to do this. We keep one machine with a hard jaw vise ready to throw a second op part in to finish it off.
We have 2 vices in both machines as we had been doing 2 ops on previous projects. LH vice we have soft jaws with .200 step and a LH vice stop.
RH vice this year we leave hard jaws and parallels with Kurt spring holder - we usually teach RH stop for datum flip but to align with Titan tutorials go with LH stop. We probe or edge find a 123 block to X and Y - for Z we think “model top” or finished thickness (ex:.750 thick) - so we want last cut to be Z0 just like 1st op only we are cutting extra material is Z positive land. So Bottom height is Model top -for face mill. Use mutti step of .050 and put top height as +.230 from Model top. We put clearance at Z1.000 and feed or retract will be above .230
So if probe the top of 123 block - and holding .750 thickness - shift Z work coordinate down -.250.
2 of my students have been getting good at soft jaws - like the 8M today. But I think for next years HS class we may have OP 2 pre programmed and they do setup only. we will see how they progress.
