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seeking advice on milling 3/4 in plywood

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Spurry:

--- Quote from: hogman on November 01, 2020, 07:42:30 AM ---Hi Spurry, can you please explain what offset is and how to use it? JR

--- End quote ---

I'll give it a go. What would be considered 'normal' tool offset is half of the diameter of the cutter. So if you have your outline required, the cutting path will be half the cutter diameter, outside of that outline so that you finish with your desired size.

You mentioned that you could not use your software to step-down. So just duplicate your outline. The first copy of it would be for example, using 3mm steps, cut down to 16mm deep, the second down to 13mm, and so on. The sneaky bit is that you add-on say 0.5mm onto to tool offsets so it's 3.50mm, until you get down to 1mm of thickness left. For that last cut, of 1mm deep, you set the tool offset to 3.00mm. Effectively you are taking a 0.5mm x 1.0mm cut to complete your work, which should give you a decent finish as so little material is being removed.

In practice, it's a lot easier to demonstrate than explain in words.

WeldingRod:
I think you want a two or three stage blower for hold down, rather than a vacuum pump.  Think "high pressure shop vac".  Unless your hardware is really well sealed,  a vacuum pump has too low of a flow rate.

Sent from my SM-G892A using Tapatalk

vtsteam:
There are all kinds of plywood so I would think the best bit speed is going to depend on the type. Douglas Fir vs Red Oak vs Occume vs Kahya for example have quite varied characteristics and hardnesses. I imagine that your experience is a better teacher than a set "plywood recommendation". I'm surprised you can't change the spindle speed via software, but also is it possible to do that manually? If you don't change plywood types during a run, seems like one setting ought to do it.

hogman:
thanks again all. super valuable information for me.

I  use fusion 360 and for say adaptive 3d, the tool will go deep at first than cut to radial setting. I have just finished running ops with the recommendation above. Just duplicated and changed the depths.

IN fusion Ramp is a 3d op that you can set stepdowns. and the 2d contour too. Yet scallop, parallel 3d adaptive do not have step down, they have the size that mill cuts radially. I have found that my ops over tax the spindle if left at initial settings.

I am now stepping down as suggested. Thank you. JR

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