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X-axis vs. Y-axis feed rates -> newbee

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  • X-axis vs. Y-axis feed rates -> newbee

    The feed rate charts in both my Smithy's and an old Sears/Atlas's manuals show the cross-feed to be 10% to 12% of the in-feed rate. Is this normal with lathes and, if so, what is the reason behind it?

  • #2
    That is how it is geared in the apron which transfers power from the leadscrew or the power feed shaft (for those lathes that ONLY use the leadscrew for threading) up to the cross slide.

    Dave

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    • #3
      Yeah, but, what is the purpose for the difference? My asian powers both feeds from a slot/keyway in the leadscrew so the difference in gearing is on purpose.

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      • #4
        Well, most lathes only have a few inches of crossfeed to begin with, if it ran at full speed you could bugger your cross slide leadscrew if it was set at high speed. Not the kind of thing you need to have happen by accident. Even at the fastest carrage feed it is easy to stop the cross feed over that short distance it travels - thus preventing inadvertent "Homer Simpson's". And it gives a nice smooth finish on face cuts...

        Dave

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        • #5
          I have usually seen 1/4 and 1/2 of longitudinal feed rates for cross slides, my Hendey is the same for both. Just depends on the whim of the maker, and to what gearing he can get to fit in the apron.

          I like the arrangement on the Hendey the best myself.

          Who knows the reasons why.

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          • #6
            i think the 1/2 feed rate on the crossslide is an economy measure.
            on the old monarchs, pratt & whitneys
            and others you could engage both feeds and cut one heck of a chamfer at 45 degrees.
            now you can only feed one way at a time.
            i dont know about hendys.
            kapullen

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            • #7
              Kap,

              Yep, you can cut 45's with my Hendey. I've ran a Monarch and a Lodge and Shipley years ago, I think they did but I am not sure, slept since then.

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              • #8
                Yes on the Lodge and Shipley. Nice machines.

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                • #9
                  I wish I had room for a Monarch - seen a beauty on the net that was Navy surplus (just like new!) on a pallet for $17,500. I hate living in a rabbit hole...

                  Dave

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                  • #10
                    yep.
                    I served my lathe time on a war production board monarch in 1969. It had been run hard and put away wet. Good for heavy work but clumsey for model work. The double ee is a nice size for home shop. We have them at work.
                    Lodge and Shipley was a great heavy duty machine too. G & L , Warner & Swasey , and
                    King Boring Mills were wonderful machines.
                    Some of the new cnc stuff is good also.
                    A cnc mill is fabulus in the home shop. I've got a boss 6 b-port I picked up cheap.Thank goodness for cad calculating all them points.
                    It's done a lot of work on my Little Hustler locomotive still in process.
                    have fun machining, I do
                    kapullen

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                    • #11
                      kap:

                      You number crunching animal, you! Does your wife know you snuck that in? I have been drooling on both a Haas (US) and Okuma (Japanese) but have no room at the moment. I hear the Kents (US) are not bad, but know little of them. It was surprising to me to find a Hardinge HLV-DR lathe (loaded) is about the same $$ as either of the two CNC mills.

                      Dave

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                      • #12

                        %
                        g0g75g90x0y0:
                        g1z.1f20.;
                        g83z1.z.1f3.0;
                        x0y0;
                        x1.y1.;
                        x-1.;
                        y-1.;
                        x1.;
                        g80g90;
                        x-2.y2.;
                        m25;
                        m2;
                        e
                        yep i bees a number cruncher.
                        Theys teaching me the mastercam at work,
                        but i crunches numbers at home.
                        It's a great machine but bridgeport dosen't
                        support these old machines very well. I had to buy two to get a good one(bad rck board). Cost $1200. with tooling, and flexawriter.
                        I guess i'm lucky finding old machines.
                        Been at it for thirty one years now(machining).
                        Happy machining
                        Kapullen


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                        • #13
                          kap;

                          If you have a electronics tech school close to you talk to an instructor and see if they would repair the board for you. They usually need good projects to trip up the "keeners" in the class. Having a spare could be handy...

                          Dave

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                          • #14
                            Kap,

                            Yuck, flexwriter. I don't have fond rememberances for one in particular. I think the tape reader was at fault actually. Was a 70's era Bridgeport series 1, later was involved in getting a series 2 up and running, it was modern and could have program punched in on controller.

                            One great thing about these older cnc machines is they still have boards that can actually be worked on.

                            G70
                            g90
                            m3
                            g0x2.99y0z.5
                            g1z.4f10
                            g2x0y-2.99i0j0f4
                            g1y-3.01f8
                            etc.
                            etc.

                            Shucks I forgot to put the little $ sign on end of each line, our editing program on PC requires it, don't know why. Sure do like that cable between PC and mill, we are even networked at work, can transfer programs all over, neato. They are even transfering cnc programs with palm computers now days.

                            Poor old rotary table sure gets neglected anymore since cnc.

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                            • #15
                              I love it when you guys talk dirty...
                              Dave

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