Does it matter what side of the 4th axis that you cut on?

Topics related to wrapped rotary machining in Aspire or VCarve Pro
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hmatyas
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Does it matter what side of the 4th axis that you cut on?

Post by hmatyas »

On my CNC's 4th axis I cut from the top; however, I was thinking of using some profile cutters that will cut from the side. So I was wondering if it matters on what side of the headstock you place the router on because of how the router is spinning?

chemstock
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Re: Does it matter what side of the 4th axis that you cut on?

Post by chemstock »

I thought about this when I don't have room above the workpiece for a bit.
Cutting from the side places the bit at an angle to the work piece rather than perpendicular. This will impact the Z axis up/down movement relative to the model and will impact any profile that you are trying to cut. Geometrically; the Z(offset) movement will become the sin(offset angle)*Z.
Visually, the plunge in the Z direction will look odd. I do not think Aspire can model offsets.
Mechanically, the bit will always have a sideload. Small diameter bits will ultimately fail.
But if you are not modeling and just cutting on a vector, I would use a climb cut to minimize chipping. Let me know how it goes.

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rscrawford
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Re: Does it matter what side of the 4th axis that you cut on?

Post by rscrawford »

I replaced my 4th axis with a lathe and I always cut from the side with a 1/2" downcut endmill. I turn the lathe at 300rpm and have it turning up into my cutter (so the downcut edge sheers the wood like a regular knife would). I spin the end mill at 18000rpm and usually have a feed speed of 10ipm. I can turn a 2" square blank into a french rolling pin with a single pass in 2 minutes, with a finish that rivals a knife cut. Just another 30 seconds each of 220, 400 and 600 grit sanding.
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rej
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Re: Does it matter what side of the 4th axis that you cut on?

Post by rej »

sweet
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http://www.roctechusacnc.com

ElevationCreations
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Re: Does it matter what side of the 4th axis that you cut on?

Post by ElevationCreations »

rscrawford wrote:
Thu Jan 14, 2021 3:07 pm
I replaced my 4th axis with a lathe
What is the difference between a 4th axis and a lathe?

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