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Multiple Setups Question

jmorphet
Enthusiast

Multiple Setups Question

jmorphet
Enthusiast
Enthusiast

I am making a clamp that requires me to flip the part in the vise three times to make the part. The first setup, I will face the top, machine the outside shape and bore the hole. The position is shown in the attached figure 1.

 

Next, I have to rotate the part 90° in the vise to cut the slit in the clamp body (figure 2). I used a second setup when I rotated the part. In the setup, I changed the stock to match the condition it will be in after the first setup is complete. So, this reduced the size of the stock and changed the offsets from Setup1. My concern is the accuracy of my adjustments to the stock. Since I picked a box point on the model, does it matter if my accuracy of the stock dimensions is off? Is there a better way to do this?

 

 

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engineguy
Mentor
Mentor

@jmorphet 

 

Usually best if you have any accuracy doubts to use "soft jaws" and machine out the shape of the part (stock in this case) to the correct depth and you will have the exact same WCS for the shape in the jaws and the part, can`t be wrong then it is just remove the extra stock by whatever means is handiest for you and you only have the depth to worry about to get the part to size which is a simple touch off and either a clearing toolpath or even a facing toolpath will do that easier 🙂

Example file attached from your original file, to see stock for the second setup better then run the first setup simulation and right click anywhere in the space and at the bottom of the list that appears is "Stock", click on that and then select "Save stock" and save it to a folder, then when you want to run the second setup you can right click again and then select the "Load stock" option and you will have a proper stock shape from previous setup, or you can simply turn on the "In process stock generation", see image below.

In process stock generation.jpg

 

Hope this helps, just run the simulation first to see the mods I made 🙂

Stay Safe

Regards

Rob

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jmorphet
Enthusiast
Enthusiast

You are talking about running the simulation. I was asking about the proper way to do the stock size in setups on a multi-setup project. In this example there are two setups.

jmorphet_0-1612798641970.png

The first setup has the stock size as 1.25 x 1.5 x 1.5.

jmorphet_1-1612798702568.png

The question is about Setup2. Do I leave the stock size the same as the first setup or do I change it to match what I believe it to be after the Setup1 machining operations as shown below.

jmorphet_2-1612798891876.png

If I change the stock size in Setup2, I may be injecting some inaccuracies into the operations that follow because I may not be accurately be listing the remaining stock dimensions. If I leave the stock the same as Setup1, I am telling Fusion360 that there is material where there is none. I don't know if that creates any issues. I believe that I can mitigate any inaccuracies by setting the WCS and mill work offsets on a machined corner as shown below. So what is the best way to deal with the stock in the second setup and the WCS?

jmorphet_3-1612800808084.png

 

 

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engineguy
Mentor
Mentor

@jmorphet 

 

I did answer your question, I only used the simulation to show the stock shape that you will have ! I wrote :-

 

Usually best if you have any accuracy doubts to use "soft jaws" and machine out the shape of the part (stock in this case) to the correct depth and you will have the exact same WCS for the shape in the jaws and the part, can`t be wrong then it is just remove the extra stock by whatever means is handiest for you and you only have the depth to worry about to get the part to size which is a simple touch off and either a clearing toolpath or even a facing toolpath will do that easier

 

The above is the best and most accurate method, when you have machined the first setup then yes, you will have a different shaped piece of material, now you are going to remove it from the vise/fixture in order to machine the second Setup operations Yes ??

You have it in your hand, Fusion really has no idea what the size of the remaining naterial is unless you physically measure the remaining material and input those values in the boxes for the stock on side two, you have to do it.

 

If the sizes in Fusion match exactly those of your part/stock that you have in your hand then you can put the part/stock in the vise again and "touch off" again on the part/stock as normal, the accuracy that you achieve will ultimately depend on how accurately you reset the Work Offset at your machine by Probing (Touching off), get that right and you should have no problem 🙂

 

Use the "soft jaws" and machine the shape of the remaining material into the jaws to hold the part/stock material and that way you have the EXACT position of your part/stock so it will be very accurate, it will then be as accurate as your machine.

 

Stay Safe

Regards

Rob

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