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  • Craftsman/Atlas Question

    I am considering purchasing Craftsman Model 101.07403 Lathe. My understanding is that this 12 x 36 model was made by Atlas. It has a single 3 jaw 5 inch collet. Does anyone know the largest collet that this model will take?

    Also, what would be a reasonable price for a machine in good condition?

    Thank you in advance.

  • #2
    3AT and this might be wrong, approximately 1/2" capacity.

    For the price, its what it is worth to you...... Going by the "book" price is rubish and with out actually having my hands on it an acurate and fair assesment is not possible. Atlas was never a top end lathe, if you plan on doing serious work buy a cheap import with a roller bearing in the head. If it is the later version with the 1/2" thick bed rail consider paying a little more because that one is a little more accurate between the centers, this might be incorrect, they had bearings in the head.

    Something else to consider, if it is an older machine its parts were cast from Zamak, the newer ones are pot metal, similiar but not as durable.
    Last edited by squirrel; 01-02-2011, 08:43 PM.

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    • #3
      Originally posted by squirrel
      3AT and this might be wrong, approximately 1/2" capacity.
      Yes, according to the Atlas Manual of Lathe Operation "the individual collets are furnished in all 32nds between 1/32 and 1/2 inch." This is for the 12" lathes.
      Allan Ostling

      Phoenix, Arizona

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      • #4
        I assume you mean a 3-jaw, 5" chuck, not collet. Just guessing, you should be able to mount a 6" dia. chuck with no problem. I think anything bigger would start to be out of proportion to the lathe, even though you could probably mount a larger one.

        As for collets: Squirrel is correct, it takes 3AT collets, which have a maximum capacity of 1/2" dia.

        You may find this http://www.lathes.co.uk/atlas/index.html informative.

        As for value: it depends on condition, and what part of the country you live in.
        ----------
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        • #5
          Originally posted by squirrel
          3AT and this might be wrong, approximately 1/2" capacity.
          Actually takes 3AT, or 3C, or 3MT collets easily.

          the 3AT and 3C require adapters, which are different for the two. Drawtube needs to be the right length for the spindle, which can be an issue for 3C because only more industrial machines use the 3C, and spindle length may be different. Often a simple spacer will take care of the length, though, since most machines for 3C had longer spindles.

          The 3MT collets will fit directly into the spindle with only a drawbar required, that could be a piece of all-thread rod..

          Another option is european "ER" collets.

          Tradeoffs:

          3AT go up to 1/2", by 64ths, and each takes only a narrow range of size, barely overlapping with the next size, really just "meeting" that size. use drawtube, so parts can be long
          3AT are specific to Atlas, but were used to some degree by Logan as one possible collet option. Nobody else ever used them at all to my knowledge.

          3C are very similar, 1/2" max, by 64ths, with size range similar, but they were used very widely, and still are to some degree. More available. Pretty much identical to Southbend 3. Also use drawtube, so parts can be long.

          3MT take short parts only, fit directly with no extra pieces, don't release as well, come in 64ths, but 32nds are more available. go up to at least 5/8", larger than 3AT or 3C. Same size requirements on parts. The cheapest, easiest way "in", but limited.

          "ER" collets. Holders are available and makeable. Take a wide range of sizes per collet, but you need to be careful to get a type of holder with a thru hole.
          Last edited by J Tiers; 01-02-2011, 08:53 PM.
          1601

          Keep eye on ball.
          Hashim Khan

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          • #6
            You are correct, I meant "chuck" not "collet".

            I live in the Southeast and the price is $300.

            Thanks for the replys.

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            • #7
              Parcall what you are calling a collet is actually a 3 jaw chuck. 8 inch chuck is about the largest that can reasonably be used on that size lathe.Craftsman lathes are really lightduty machines lightweight, potmetal gears. They work fine for a beginner lathe. The amount of tooling that comes with a lathe uaually helps determine price. More stuff higher price.Post some pictures of the machine and what comes with it we like pictures.Then maybe some of the Craftsman gurus could help with a offer on it.I don't have a clue any more I moved on to bigger machines years ago.War story Back about 1979 I bought one from a local auto salvageyard for 750.00 it was fullytooled cabinet 3&4 jaw chucks,milling attachment.toolpost grinder ect.It was literally buried in a pile of starters and alternators.Took several hours just to dig it out Quite a score for a teenager just starting out.

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              • #8
                $300 is a great price for an AC that's in good shape and has all its parts.

                I've heard you can mount a 5C collet chuck and get the full 1" or so through the headstock. You'll certainly want to do a fact check before you purchase such a thing however.

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                • #9
                  Originally posted by parcall
                  You are correct, I meant "chuck" not "collet".

                  I live in the Southeast and the price is $300.

                  Thanks for the replys.
                  You better drive over tonite and buy it, it will part out for over $1000 if its decent. That's assuming it has the really cool factory wooden top base and a thread dial and change gears.

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                  • #10
                    You can't put 1" through the headstock of an Atlas. The 12" model has a 3/4" hole. I started out with one. I don't want another one.

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                    • #11
                      Ah, I couldn't remember. And was too lazy to go downstairs and check ;-)

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                      • #12
                        My Atlas 618 came with Timken Roller Bearings back in 1971.

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                        • #13
                          Originally posted by parcall
                          I am considering purchasing Craftsman Model 101.07403 Lathe. My understanding is that this 12 x 36 model was made by Atlas. It has a single 3 jaw 5 inch collet. Does anyone know the largest collet that this model will take?

                          Also, what would be a reasonable price for a machine in good condition?

                          Thank you in advance.
                          Hi. Yes, that lathe was made by Atlas and mine is basically identical to yours. Measure the distance from the center of the chuck to the top of the bed/ways (flat metal rails). Double the number -and that's what size lathe it is. Mine measures 5" so it's a 10" lathe and the largest chuck you can comfortably install is 6". The spindle hole is .770" diameter to accomodate 3/4" stock. Spindle threads are 1 1/2" 8 TPI.

                          Measure the ways from all the way from the sidegears on the left to the other end. It's probably 42". The headstock takes up space and with the tailstock installed, the longest piece you can work on is roughly 22".

                          Most of the time, they require a good disassembly and cleaning. There's no mystery to it. They come apart and back together easily. If the belts are bad, measure them and use automotive belts -some people use the linked belts with good results.

                          The machines require a solid bench to dampen vibration caused by the gravity-pull motor, bracket and intermediate idler pulley mechanism. Most of the original motors are long gone. You need a 1725 RPM with at least 1/2HP, preferrably 1HP.

                          Check for full/proper operation as the gears in the apron are intentionally soft metal and were designed to break rather than bend the leadscrew if the operator accidentally left the carriage engaged and crashed the head or tailstock. Side gear sets for different leadscrew RPMs are commonly available. Replacement parts are common as variants of this machine were available from 1936 to 1981.

                          My machine was heavily used at Bethlehem Steel with over 20 years of daily use. Took me a couple weeks of learning it's quirks but, it runs perfectly. You'r not going to cut hardened metal or any solid bar much over 3" diameter. I've easily cut 5" dia pipe in it.

                          Typical prices run anywhere from 300 to $600 depending on how many accessories (center/follower rest, tooling etc) it comes with. I paid 300 for mine and easily use it 20 hours a week with very good results. It's a fine entry level / hobbyist lathe and can hold +/- 0.001" if you fine tune it and know how to properly use a manual lathe.

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                          • #14
                            Originally posted by Ray C
                            The machines require a solid bench to dampen vibration caused by the gravity-pull motor, bracket and intermediate idler pulley mechanism.
                            Fairly cheap and easy benchtop is retasking a 1-3/4" solid core door as a mounting surface. I went one step further and glued/screwed 3/4" plywood to either side of it, and the result is more than stiff enough for my C/A 12x36 (and requires 2 people to move even without the legs).

                            Originally posted by Ray C
                            It's a fine entry level / hobbyist lathe and can hold +/- 0.001" if you fine tune it and know how to properly use a manual lathe.
                            Agreed. And frankly once I got it dialed in and understood its capabilities I routinely hit +/- 0.005" without much thought whatsoever. Not the sturdiest of machines, but lately I've been turning a lot of 1" diameter 1144 and 17-4PH stainless with nary a complaint even with 0.040" deep (0.080" diametric) cuts using CCMT carbide inserts. Could probably take more, but I don't want to stress the motor too much. But any way you cut it, not bad for a hobby-class machine.
                            Last edited by adatesman; 01-02-2011, 11:28 PM.

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                            • #15
                              photos

                              Once again everybody, thanks so much for helping me out. This is the first time I have used this site, what a wealth of information.

                              As someone requested, I have two photos, but the posting rules below say that I not post attachments, so I don't know how to add the photos.

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