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End mill length needed for cutting through 1.5" hardwood

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  • End mill length needed for cutting through 1.5" hardwood


    I just got a couple of jobs that will require cutting through 1.5" thick cherry. The .25" endmills I have only have a cutting length of 1.25". Will they be ok to cut all the way through since the kerf has already been cut?
    Lester Sak
    2021 Stinger I SR-24, 1.7kw Spindle
    FTC, Laser, Counter Balance, Gantry Lift, T-slots
    VCarve Pro 10.5 & WinCNC
  • #2

    Even though the kerf is cut, there will be no way for the chips to evacuate the cut. This will probably cause excessive heat build up.
    Stinger II SR44 with servos
    Recoil Prep
    3KW spindle
    7 Watt Laser
    Pro Option Pack
    Hand Held Keypad
    T-Slot Table with Hurricane Vacuum.
    Aspire 10.5
    WinCnc

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    • #3

      Originally posted by Pete marken View Post
      Even though the kerf is cut, there will be no way for the chips to evacuate the cut. This will probably cause excessive heat build up.
      I'm assuming you're saying that as when the bit has cut down the 1.25", there won't be any cutting edge left at the top of the cut to pull the chips out, is that correct? If so, then a bit with a longer cutting edge would solve that. My thought was to use a down cut bit to start and then switch to an upcut. Does this sound right? Are there any bits that are long enough that you might recommend?

      Thanks!
      Lester Sak
      2021 Stinger I SR-24, 1.7kw Spindle
      FTC, Laser, Counter Balance, Gantry Lift, T-slots
      VCarve Pro 10.5 & WinCNC

      Comment

      • #4

        I recently cut some HDU that was 1.5" thick with an extra long 1/4" bit with a 1.5" CL. As Pete said above, the chips had a hard time getting out of the cut once the depth was over 3/4". In my case I had to pause the job and run an allen key through the kerf to clear the chips up and then vacuum them out.... and this was with HDU foam.
        You could do the same thing or maybe try using a long 1/2" up-cut or compression bit. Pricey but the wider kerf might make it easier to get the chips out.
        Good luck.
        Pete
        ----------
        2021 Stinger I SR-24, 1kW Spindle
        Performance Pkg w/Gantry Lift, FTC
        Phenolic Top, Storm Vac, JTech Laser
        VCarve Pro 11.0
        www.gotoguysmarine.com

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        • #5

          You an buy a relieved shank .25" endmill that can do deep cuts but these were primarily designed for materials like foam. You will likely get chatter and you cannot do a "final pass" since the LOC is far shorter than your full depth of cut. I have one of these and tried to use it for cutting out guitar bodies, but switched to a .375" endmill with a 1.75" LOC for these deep cuts.
          ---
          Jim Becker

          SR-44 (2018), 1.7kw spindle, Performance Premium, USB, Keypad, T-Slot table (y-axis configuration), WinCNC, VCarve Pro upgraded to Aspire

          Non CNC stuff...

          SCM/Minimax
          Festool "a good collection"
          Stubby - lathe
          Oneida Cyclone
          more...

          Retired from full time work in the telecom industry 9/2017
          Occasional commission work for others, but mostly for me...furniture/tack trunks/signage/guitars
          Located Bucks County PA

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          • #6

            Thanks guys, I appreciate the feedback. Glad I asked before trying this, I hadn't considered the issue of evacuating the chips. I'm gonna have to think this through.
            Lester Sak
            2021 Stinger I SR-24, 1.7kw Spindle
            FTC, Laser, Counter Balance, Gantry Lift, T-slots
            VCarve Pro 10.5 & WinCNC

            Comment

            • #7

              I’d call Joey at USRouter tools for ideas.
              I have used 0.5 inch tools with lengths from 1.5 to 2.5 inches.
              Charlie L
              Stinger II, 48 by 48, 1.7 kW Spindle, FTC + Laser + Recoil + Vacuum, July 2012
              WinCNC 2.5.03, Aspire, PhotoVCarve, Windows 7 Pro SP1

              Comment

              • #8

                Originally posted by Charlie_L View Post
                I’d call Joey at USRouter tools for ideas.
                I have used 0.5 inch tools with lengths from 1.5 to 2.5 inches.
                Good idea, thanks.
                Lester Sak
                2021 Stinger I SR-24, 1.7kw Spindle
                FTC, Laser, Counter Balance, Gantry Lift, T-slots
                VCarve Pro 10.5 & WinCNC

                Comment

                • #9

                  Originally posted by Jim Becker View Post
                  You an buy a relieved shank .25" endmill that can do deep cuts but these were primarily designed for materials like foam. You will likely get chatter and you cannot do a "final pass" since the LOC is far shorter than your full depth of cut. I have one of these and tried to use it for cutting out guitar bodies, but switched to a .375" endmill with a 1.75" LOC for these deep cuts.
                  Thanks Jim, good to know what worked for you. Did you use an upcut or down cut bit on the guitars?
                  Lester Sak
                  2021 Stinger I SR-24, 1.7kw Spindle
                  FTC, Laser, Counter Balance, Gantry Lift, T-slots
                  VCarve Pro 10.5 & WinCNC

                  Comment

                  • #10

                    Originally posted by sakle2k View Post

                    Thanks Jim, good to know what worked for you. Did you use an upcut or down cut bit on the guitars?
                    The specific cutter I have is an up-cut, Cobra brand off Amazon, and very reasonably priced. I consider it a specialty cutter and it's fine for the purpose. I'm also not a production shop. In addition to the guitar bodies, I've used it to trim slab ends and other utilities like that where the material is thick. I generally cut with a small allowance (.02-.03 mm usually) and do a last pass to clean the edge.
                    ---
                    Jim Becker

                    SR-44 (2018), 1.7kw spindle, Performance Premium, USB, Keypad, T-Slot table (y-axis configuration), WinCNC, VCarve Pro upgraded to Aspire

                    Non CNC stuff...

                    SCM/Minimax
                    Festool "a good collection"
                    Stubby - lathe
                    Oneida Cyclone
                    more...

                    Retired from full time work in the telecom industry 9/2017
                    Occasional commission work for others, but mostly for me...furniture/tack trunks/signage/guitars
                    Located Bucks County PA

                    Comment

                    • #11

                      1/2" endmills cut better in hardwoods than 1/4", especially if you are cutting 1.5". Its counterintuitive, but the larger endmills actually cut easier than the 1/4" in hard woods.
                      Russell Crawford
                      Cobra 408 ATC with recoil
                      Alberta, Canada
                      www.cherryleaf-rustle.com

                      Comment

                      • #12

                        I picked up an Amana Tool 46323 SC Spiral Plunge 3/8" upcut. Went through it like it wasn't there, lol. I did follow the cut to manually clean chips left in the kerf but worked out well, thanks again to everyone.
                        Russell, I will pick up a 1/2" at some point.
                        Lester Sak
                        2021 Stinger I SR-24, 1.7kw Spindle
                        FTC, Laser, Counter Balance, Gantry Lift, T-slots
                        VCarve Pro 10.5 & WinCNC

                        Comment

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