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Is onion skinning all parts faster than vacuuming?

9/1/16       
Derrek

In another thread, the topic of dust evacuation came up and how to get the table cleaner. I said I would test out vacumming the table vs. Onionskinning every part.
My basis for doing this was my first reaction that "of course it will be slower" since we are goi g around all the parts twice. I then realized that if we eliminated having to vacuum the table that the overall time could be similar. If so, the onion skinning would make sense, since the parts would be ready for removal from the table without having the operator present vs. Having him vacuum of the table (we have a dust collection hose at the end of the cnc and try to get the area as clean as possible before blowing off with compressed air)
I ran 2 sets off identical shelves on a 4x8 sheet.
Without onion skin the parts ran in 1:18 seconds plus another 54 seconds to clean the table.
With the onion skin 2:48 to run the parts and 10 seconds to clean the table.
A little to long for me to make it worth while.
Your results may vary, watch the video to see.
Video here, https://youtu.be/2zIZzou8m_Y

9/2/16       #2: Is onion skinning all parts faster ...
Mark

Derrek,
That is a great video! Thanks for taking the time and effort to post it. Dust is a big deal for me and I work hard at minimizing it in our shop. It is a serious concern for a lot of operators out there and I am not the only one thinking hard on it. This data also correlates very well with what I experience in my environment.
Like you mentioned, different setups will vary the results some. I don't use common line. With my own setup I actually have a little more of a differential between onion skinning and single pass due to the fact that I cut relatively smaller and so more densely packed base cabinet rails , nailers and drawer parts on the cnc yielding more small parts that of course take even more time on the second pass. Some of these parts would require onion skinning even without the dust issue. I Also depending on the material I use a feed rate of about 720 to 830 IPM for a feed rate. It looks like you may be moving even faster than that, but it is hard to guess from a video. 3 flute tooling would make your feed closer to 1100 IPM.

That all being said it is still a small proportion of overall time for me to onion skin due to the fact that between drilling, dadoing and perimeter cuts my total sheet time is closer to 12 minutes, including drilling with a drill block, dados an occasional saw cut, onion skining perimeters and sheet change time.
I am pretty comfortable at 35 sheets a day or so. The onion skin costs me overall between 1 minute and 2-1/2 minutes out of that 12 depending on the mix of parts for a normal average sheet.

9/2/16       #3: Is onion skinning all parts faster ...
Derrek

Thanks,
Yeah if you already are onion skinning 40% of your parts then the time would be even less to finish them all that way.
Pull out your stop watch and test it.
What i realized this morning is how much time I will save with my new auto load/unload machine. Its 45 seconds between sheets. So i will be saving 10 seconds a sheet right there! That doesnt sound like much but it works out to about 25 hours per year. Thats just in the vacuuming time. I figure another 3 minutes per sheet unloading.

10/3/16       #4: Is onion skinning all parts faster ...
Brian

Number of parts at the end of the week gives the answer.


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