Quote:
Originally Posted by JoeyInCali View Post
I use a 3 flute slot cutter.
No reason for 6 minute pass here.
My taperer is powered by an X-axis mill auto feed.
Auto stop at ends.
CNN spindle spins a lot faster than sawsoe,
Joe,
IMO, the travel speed has much more effect on the RMS finish than just the RPM of the spindle or the saw blade rpm.
The balanced saw blade with vibration dampener and proper drive belt is also a big factor. The blade also has at least 50 x more mass and therefore more stability than my 6 wing cutter with a 1/4" shaft on my CNC spindle.
Saw blade RPM is 3450
3450 x 80 cutters = 276,000 cuts per minute or 5 inches travel
276,000 x 6 mins = 1,656,000 total cuts on 30 inch shaft
When I cut custom billiard tapers on my CNC using my NSK spindle with a 6 wing cutter:
25000 RPM x 6 = 150,000 cuts per minute
150,000 x 6 minute duration = 900,000 cuts with a 6 wing.
A 3 wing cutter would be 450,000 total cuts using a 6 minute travel duration.
Using a 50,000 RPM spindle would get you back to 450,000 cuts in a 3 minute total travel / duration.
Again the travel speed and total duration is the Key to the best RMS finish along with the properly tuned Lathe or rotation RPM. IMO
To the OP, your question has many detailed premutations to consider to dial in your end result when creating a shaft. Every detail requires the utmost attention when dialing in your rig's set up or tuning.
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I have noticed there is a huge difference in the RMS finish and more sanding required using my CNC compared to my shaft saw machine at the numbers shown above. Again, any longer than a 6 minute duration does not seem to yield a better result. On my equipment 6 minutes seems to be the Goldielocks situation. "Just Right "
JMO,
Rick