[Andy Graves]

How much material do leave when “onion skining” parts on the CNC? I do about .004 . Has anyone had any success going less than that?

[Seth Emery]

Geez Andy. I think .004″ sounds great. We leave .030″.

[Mark Urbaniak]

.003 here Andy

[Shane Barker]

.020, and we don’t have any problems with this amount. If we are cutting something really small I may go more and then do a second pass.

Shane

[Andy Graves]

It will stay attached at .004 but you have to sand the remaining off. I will try the .003 and see if it will just fall off.

[Mark Urbaniak]

i just use a trim router with a lamitate straight bit , just flip the part over ,poke thru, your good to go

[Shane Barker]

The thickness of our MDF spoil board changes too much from the weather to cut it that close. We have a routine of flush trimming the excess that works pretty well.

Shane

[Andy Graves]

I just cut a top today and set it to .004 and it worked very will. I did set the surface of the mdf spoilboard before I cut. Then all I had to do was lightly sand the edges and it was perfect.

[Shane Barker]

If we were to touch off the spoil board just before cutting I could see the .004 working but we usually only touch off when we change tools. It is amazing how much our spoil board changes in thickness from the weather.

Shane

[Travis Harper]

getting ready to buy a cnc…. hmmm… what is onion skinning anyway. I think you are saying you dont go all the way through the material but not sur.

[Shane Barker]

That’s exactly right Travis, by not cutting through you don’t breach the vacuum and the parts are still connected and stay in place better. All this is done by leaving a thin skin of the material otherwise known as an onion skin.

Shane

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