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Mill-Turn Stock Model


Brandon Swihart
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Hi, I just went through the mill-turn tutorials and I'm setting up my first ever mill-turn job in Mastercam. One thing I notice is that I can't find a way to set my own solid model as the stock. We're roughing this part out on a 3 axis mill and being able to save out the stock model's mesh and use that as the initial stock in the mill-turn op would be extremely helpful.

I also don't want to clamp on the bar stock itself, this part has endwork done before the mill-turn op that allows us to insert fixturing and clamp on that, which affects the jaw/tool holder clearances and the distance from the end of the part to the face of the jaw on either spindle. Does anyone know a way around this? Thanks

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Edited by Brandon Swihart
Found the stock dropdown
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On 10/23/2021 at 12:55 PM, Brandon Swihart said:

Hi, I just went through the mill-turn tutorials and I'm setting up my first ever mill-turn job in Mastercam. One thing I notice is that I can't find a way to set my own solid model as the stock. We're roughing this part out on a 3 axis mill and being able to save out the stock model's mesh and use that as the initial stock in the mill-turn op would be extremely helpful.

I also don't want to clamp on the bar stock itself, this part has endwork done before the mill-turn op that allows us to insert fixturing and clamp on that, which affects the jaw/tool holder clearances and the distance from the end of the part to the face of the jaw on either spindle. Does anyone know a way around this? Thanks

Capture.PNG

 Need to add stock that will make it longer in the stock setup then when you define the stick out the job setup will then grab it correctly.

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that's been my pet peeve since it was in conception. I've done a lot of mill turn with much of it mounted in main and sub spindle fixtures. I requesting this option since the focus group days at CNC. Not everything in a mill turn part comes from bar stock. So like Ron said, lie to it but not a good representation for simulation for sure.

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hi Brandon, the easiest thing to do in my opinion is create a profile that represents the Exact shape of your stock, then use Revolved stock for your stock setup, as long as your profile you select doesn't have stock on the end that was already cut it should clamp right where you need.

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Also if you turned the first side of that part in mastercam you can do a lathe stock preview to save the stock geometry or the turn profile if you dont feel like re-creating it.

if none of this makes any sense what im trying to say is do it kindof like i did a stock flip in this video here https://fastechincorporated-my.sharepoint.com/:v:/g/personal/joshc_fastechinc_net/EeQzcaIJqGBKqXKRNrZhuu4B8RauXDgJZ4_JBHg7jWoL2A?e=6yjfQN

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as a work around Brandon just make your Turned stock profile include enough geometry to cover the fixture, see image below. from a quick test this works well. Mayday submitted it to cnc it sounds like so maybe there will one day be a better way but i think this should do a nice job and isn't very difficult to draw the stock profile

2.jpg

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Using a Trunnion assembly currently in a I-200 and it is not supported in MT, but I am making it work. I feel your pain this was brought up back when I was doing this kind of stuff in X4. I was also part of that focus group funny since I rounded up the folks that went, but here we are still limping along to do MT type of work that is not standard bar stock type of work. 

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