Oh Boy... more fun with sears...

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  • Butterfingers
    PhD in Automagology
    • Jan 2001
    • 2263
    #1

    Oh Boy... more fun with sears...

    Brassler #4 Round Solid Carbide Dental BUR Packing 8 Microflutes/ and cutting edges.

    vs.

    Hardened Automag Sear in unheated case hardened form...

    yeah You knew it was coming...

    4 WINS Brassler #4

    4 holes... Like butter...

    Mind you this was used in a drill press at @ 3024 RPM's

    Havent tried it yet but I could probably MILL the sear with the handpeice @ 1/2 Million RPMs

    Dont screw with your dentist he'll cut your teeth out!

    Im sure my parents will be happy that im using my $1000 bur kit to do machine work

    Pics to follow...
    Did you hear about the new european weapons contracts? France is going to make the wooden sticks Spain making the little white flags
    Tags: None
    • WARPED1
      I'm a pirate, ARRRRRRRRRR!
      • Nov 2001
      • 7458
      #2
      Sears is a good store, I worked there during high school.
      [Something Cool is Here]

        Comment

        • RRfireblade
          [email protected]

          • Jun 2002
          • 5103
          #3
          Just curious,

          what's with this latest obsession with Sears?

          (the metal ones,not the store)
          Logic Paintball Forums
          My A O Feedback Here
          Other Feedback Here
          If I've Been Any help
          Please Leave Some. :)

            Comment

            • trains are bad
              Registered User
              • Oct 2003
              • 1751
              #4
              Speaking of sears, Are all mag sear the same?
              TRB's feedback

                Comment

                • Butterfingers
                  PhD in Automagology
                  • Jan 2001
                  • 2263
                  #5
                  nope
                  the RTP and the Automags are diffrent...

                  As for the sears...

                  Im modifying the pivot point so that the ULT will have a shorter chuff resistant pull.
                  Did you hear about the new european weapons contracts? France is going to make the wooden sticks Spain making the little white flags

                    Comment

                    • WARPED1
                      I'm a pirate, ARRRRRRRRRR!
                      • Nov 2001
                      • 7458
                      #6
                      This one time at Sears, this crazy old guy was wandering around screaming"WHERE ARE THE GARDEN WEASELS?!"
                      Anyway, good luck Butters.
                      [Something Cool is Here]

                        Comment

                        • BlackVCG
                          Grubby Owner

                          • Oct 2000
                          • 4956
                          #7
                          Hmm... I used a regular HSS end mill to put a flat further up the arm of the sear and a regular HSS drill bit to drill my new pivot point when I changed the pivot point on my RTP sear......

                          Drilled and milled w/o a problem.
                          My Feedback

                            Comment

                            • Butterfingers
                              PhD in Automagology
                              • Jan 2001
                              • 2263
                              #8
                              Yeah, carbide is good stuff...

                              I broke 2 NEW cobalt bits before experimenting with alternate methods.
                              Did you hear about the new european weapons contracts? France is going to make the wooden sticks Spain making the little white flags

                                Comment

                                • Evil1
                                  Registered User
                                  • Nov 2003
                                  • 979
                                  #9
                                  Isn't carbide a little heavy?

                                    Comment

                                    • Big'n slo
                                      Sponsored by...my paycheck
                                      • Mar 2003
                                      • 1909
                                      #10
                                      Originally posted by Butterfingers
                                      Yeah, carbide is good stuff...

                                      I broke 2 NEW cobalt bits before experimenting with alternate methods.
                                      +

                                      What RPM were you spinning them at?

                                        Comment

                                        • Butterfingers
                                          PhD in Automagology
                                          • Jan 2001
                                          • 2263
                                          #11
                                          3024 RPM... high speed cobalt bits Craftsman.

                                          I must have used a gallon of oil... for all my efforts i get an oily puddle in concrete and a little divot in the sear.

                                          Bit too much pressure on the press because it wasent cutting= frustration= push harder= breaking
                                          Did you hear about the new european weapons contracts? France is going to make the wooden sticks Spain making the little white flags

                                            Comment

                                            • Big'n slo
                                              Sponsored by...my paycheck
                                              • Mar 2003
                                              • 1909
                                              #12
                                              3024RPM? I don't think my mill would do that!

                                              Just an FYI,
                                              If you try those bits I suggested in your other sear thread do not spin them faster than 200 RPM.

                                                Comment

                                                • Butterfingers
                                                  PhD in Automagology
                                                  • Jan 2001
                                                  • 2263
                                                  #13
                                                  My drill press dosent go below 580 RPM's
                                                  Did you hear about the new european weapons contracts? France is going to make the wooden sticks Spain making the little white flags

                                                    Comment

                                                    • BlackVCG
                                                      Grubby Owner

                                                      • Oct 2000
                                                      • 4956
                                                      #14
                                                      Like I said I used a HSS (High Speed Steel - The cheap cutting material) spinning at about 600rpm with a drop of oil and it went through like butter.

                                                      At 3K rpm, I'm surprised the bit didn't seperate the flutes from it and blow up. That's what happens when you run HSS end mills too fast and try to take a big cut...
                                                      My Feedback

                                                        Comment

                                                        • Butterfingers
                                                          PhD in Automagology
                                                          • Jan 2001
                                                          • 2263
                                                          #15
                                                          High speed dental burs are made out of solid tungsten carbide or surgical stainless steel with Synthetic diamond tips...

                                                          They are designed to run at speeds greater than 350,000 RPM's And are safe to use with new age Very High speed air turbine ceramic bearing Handpeices that run close to 1/2 million RPMs.



                                                          3024 RPM's is WAY under its rated speed.

                                                          I dont know what I was doing wrong... The cobalt bit I was using didnt even scratch the surface.


                                                          Last edited by Butterfingers; 03-18-2004, 12:56 PM.
                                                          Did you hear about the new european weapons contracts? France is going to make the wooden sticks Spain making the little white flags

                                                            Comment

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