Les, I've run it faster w/ a lighter cut but I found that my best material removal rate vs accuracy was more in the 1/2-3/4" at the 100ipm. I used to use solidcarbide spiral type cutters, as well as compression cutters etc. But I've since gone back to straight cutters where possible [for cutting wood or wood products]. The finish quality on the spiral cutters just wasn't up to snuff w/ the standard router bit type cutters [straight edges].With the spiral type cutters the chance of chipping the top edge was alot higher [and random], even when using compression cutters, which were better. The issue I had w/ compression cutters was that I wasn't always just routing to a net shape but instead slotting or cutting a recess in the face etc. This would only use the bottom [upcut] part of the bit and still allow the chipping issue. I'm not sure why this is but I now rarely have edge chipping or edges that need dressing or touch up [I attribute it to the sqr cutting edge not being an 'up or down' shear cutting action].
W/ the sqr bits almost 100% of the stuff is usable straight off the table. The chipping was my main concern [ie;13 ply Baltic Birch] but once I went back to the sqr cutters that has disappeared as an 'issue'. I certainly don't mind as the sqr router bits are a fair bit less money than the fancy spiral and compression cutting bits. The only negative is that you can't plung w/ them, but a 15deg ramp is no problem. A small price to pay for the job they do [just my opinon]. I buy alot of my tools from Toolstoday.com Jarrett Johnson ----- Original Message ----- From: Les Newell <[email protected]> Date: Thursday, April 28, 2011 3:43 pm Subject: Re: [Emc-users] Router Cutter v Milling Cutter > That feed looks a little slow to me. I regularly run 4m/min > (160IPM) at > 18k RPM with a single flute 1/2" replaceable tip cutter. > Admittedly I > tend towards shallower DOC, say 10 - 12mm for a full cut. IME, for > spiral or PCD cutters to justify their extra cost you need to > really > work them hard. If you are running at lower speeds/feeds ordinary > cheap > 2 flute carbide cutters work well enough. > > Les > > On 28/04/11 18:45, H & J Johnson wrote: > > As a comparison I typically route wood at +/-100ipm [80-130 > typically] and 1/2" cutter at 1/2"-3/4" DOC. At these speeds a > full cut is possible, but > > you need to be cranking at 18K or so [using a 3hp spindle]. This > equates to a 0.011" chip on a bit w/ two cutting edges (100ipm x > 2)/18000rpm= 0.011"/edge. > > > > 2500rpm at 8ipm is a 0.0016" chip [assuming the two cutting > edges again] I'd think if you ran it faster [IPM] it would work > > better and last longer. When I'm done cutting I can grab the > cutter right out of the spindle and its not even hardly warm > > [certainly not 'hot']. They don't last forever but I have been > able to get many thousands of inches from a good quality carbide > router> bit. > > > > This is in cutting both MDF and various solid and laminated woods. > > > > FWIW > > > > Jarrett Johnson > > > > > ------------------------------------------------------------------- > ----------- > WhatsUp Gold - Download Free Network Management Software > The most intuitive, comprehensive, and cost-effective network > management toolset available today. Delivers lowest initial > acquisition cost and overall TCO of any competing solution. > http://p.sf.net/sfu/whatsupgold-sd > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ WhatsUp Gold - Download Free Network Management Software The most intuitive, comprehensive, and cost-effective network management toolset available today. Delivers lowest initial acquisition cost and overall TCO of any competing solution. http://p.sf.net/sfu/whatsupgold-sd _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
