Thread: Speeds and feeds
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24-03-2016 #1
Hello people,
I have tried using FS Wizard for an HSS no coating 6mm cutter, 4 x 13mm flutes, overall length of 57mm but let's say length from holder of 25mm, 35° helix angle, 90° lead angle. Set for cutting "Plastics, soft non-metals". I get:
RPM = 10000
FR = 3500mm/min
DOC = 0.8mm
RPM and FR seem alright to me, but the DOC is strangely low.
Here is the link to the calculation:
http://zero-divide.net/?page=fswizar...ool_id=2990962
This is the type of cutter I have :
http://www.aliexpress.com/item/Diame...255234397.html
According to a rather popular Youtube video:
RPM = surface feet per minute (SFM) * tool diamater * 3.82
Feed rate = RPM * chip load * # flutes
Rule of thumb:
chip load = tool diamater (inches) / 150 => gives weird numbers
DOC = .5 * tool diameter
How do you estimate the Surface Feet per Minute (SFM) when it wasn't provided by the manufacturer ?
The rule of thumb for the chip load gives me weird results: 0.0015" for the example cutter I've used. So instead I used 0.004".
For the same cutter as above, I get:
RPM = 3000
FR = 1200 mm/min
DOC = 3mm
And if I use an SFM of 500:
RPM = 10000
FR = 3200 mm/min
DOC = 3mm
I'm just trying to figure out general rules for slotting, surfacing, etc.
All the best,
G.
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