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IndustryArena Forum > MetalWorking Machines > Tormach Personal CNC Mill > Buying my first CNC (1100M vs 770MX)
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  1. #1

    Join Date
    Aug 2020
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    4

    Question Buying my first CNC (1100M vs 770MX)

    Hi:

    I'm new to the CNC/Manufacture world and going to buy my first CNC. Currently I was going for the PCNC1100M but recently the PCNC770MX caught my eyes and now I'm not sure for which one I should be aiming for.

    In one hand the 1100M has a bigger working area and more power in the spindle also with my current budget I could get the floodCoolant system, the PDB and automatic oiler also this budget does not allow me to buy the enclosure.

    In the other the 770MX allows up to 10000RPM and the servos allow bigger feeds , comes with rigid tapping and the BT30 system allows more tooling capabilities (and more rigidity). The only thing that gets me is the need of a 110V network (I must buy a transformer in order to step down my 220V network to 110V).

    I could not find any 770MX review on the internet but I assume the tolerances are the same as their correspondant M line machines. The intended use would be prototyping and building robots. I currently have a 3d printer but It's time to move to metal in order to build industry acceptable ones. I'm aiming for aluminum/steel material.

    Any comments are well received.
    Best Regards.

  2. #2

    Join Date
    Mar 2020
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    71

    Re: Buying my first CNC (1100M vs 770MX)

    I have the 1100M and while I am definitely looking to upgrade it to MX specs, I am doing so with the following knowledge

    Spindle power is far more limiting than feed and rapid speeds. The servo upgrade is nice but mostly because of the closed loop nature preventing lost steps if/when the table gets jammed up because you're pushing the cut too hard for the spindle to keep up. Increased rapid speeds are nice if you're doing a lot of repositioning of the tool but otherwise they aren't of much use.

    Rigid tapping is nice, but far from necessary. Thread milling has been working wonderfully for me on both internal and external threads. For small stuff I have a tension/compression head from tormach that has seen 6-48 through 1/4-20 work in steel and aluminum without a single broken tap.

    BT30 tooling... yeah I want that.

    10k rpm spindle... yeah I want that too.

    Personally, I would buy the 1100M and upgrade it as your budget allows in the future. That was one of the major selling points for me when getting into my tormach. I had a budget similar to yours and in the end I bought an 1100M exactly as you described with the addition of an enclosure (well worth the stretch if you can make it happen, flood coolant will be MESSY otherwise). With time I will definitely be upgrading the spindle as well as the steppers. I also intend to add or build an ATC. I've already built a half decent 4th axis until I can afford a microarc. The 770MX has all the nice addons but you can never upgrade the working area and the spindle power is what it is so if you start bogging it down, there's nothing more you can do. FWIW, I have definitely bogged and stalled my spindle even in aluminum so it will happen especially if you're new to machining. I too am a novice. I've had my machine for less than a year and prior to getting it I spent about 6 months of saturday's playing with the 440 at the local college.

  3. #3

    Join Date
    Aug 2020
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    4

    Re: Buying my first CNC (1100M vs 770MX)

    Thanks for the reply !.
    Right now I am more prone to buy the 1100M but what is kinda retaining me is the fact of buying the TTS system to then change to BT30.
    For what I saw, servos do not add a LOT to the new machine and the fact that a transformer would be necessary is a extra investment I could be doing in mills or something else.

    I supposed the enclosure is a must when using flood coolant, maybe something home made could be build.

  4. #4

    Join Date
    Mar 2020
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    71

    Re: Buying my first CNC (1100M vs 770MX)

    I'm not real thrilled about having to change out all my tool holders either. I've actually put myself on hold for several tool holders that I would like to have but don't want to have to buy again once I upgrade so I'm just making do with the selection I have. Not that it's limiting me too much but it would be nice to get a couple more 1/4" holders and a drag engraver

  5. #5

    Join Date
    Aug 2020
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    4

    Re: Buying my first CNC (1100M vs 770MX)

    In your opinion what tools are a must buy ?

    As a starter I think I would add some 1/2 - 1/4 and 3/8 end mills (3 flute for aluminum , ball . chamfer). Some rough mills, a Tormach MiniMill (3/4"). Some metric drills, thread mills and reamers. I would be going for this kind of setup , but I don't know how many and which ones.

    What tools did you pick when you bought your machine ?

  6. #6

    Join Date
    Mar 2020
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    71

    Re: Buying my first CNC (1100M vs 770MX)

    I started with a shear hog, superfly, 3/8 2flute em, 1/4 3 flute em, chamfer mill, and a jobber length drill index (fractional, letter and wire sizes). Over time I have added 1/4 4 flute for steel, as well as a variety of specialty sizes and styles for specific jobs. Don't waste your money on 1/2" tools. My experience, as well as some consensus here, is that they don't work well on the tormachs. Probably due to limited weight/rigidity and spindle power but I don't really know that for sure. For aluminum I've had surprisingly good results from the speed tiger tools available on amazon. In steel I struggled for a long time before I finally stepped down to a 1/4" tool and checked and adjusted runout of the tool. As soon as I did those two things I was making chips with no problems. Prior to that I couldn't get more than a couple passes before the tool would be shot and start screaming at me. Lately I've been using lakeshore carbide but I have some speed tiger tools that I am going to be trying out when my current one gets dull. I haven't invested in any roughing tools yet other than the shear hog so no comments there.

  7. #7
    Registered
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    Mar 2009
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    1881

    Re: Buying my first CNC (1100M vs 770MX)

    I have a PCNC 1100 Series II that I bought new in July 2011, and I have just run the heck out of it.

    My company is Mid Day Machining because I seldom start before 11:AM and I’m done by 5:PM.

    I’ve done a few outside jobs since I got my machine, but for the most part I manufacture a line of running gear for remote control gas powered boats and trucks.

    I’m 75 years old now, and I keep machining just for something to do.
    You can buy GOOD PARTS or you can buy CHEAP PARTS, but you can't buy GOOD CHEAP PARTS.

  8. #8

    Join Date
    Aug 2020
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    4

    Re: Buying my first CNC (1100M vs 770MX)

    Thanks both for the response. I'm going for the 1100M !
    Hope I will be making chips soon.

  9. #9
    Junior Member
    Join Date
    Apr 2013
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    1593

    Re: Buying my first CNC (1100M vs 770MX)

    Not as cheap as your Speed Tiger but I have had excellent results with https://www.shars.com/3-8-se-2-flute...l-for-aluminum on my 770. The ZrN seems to make a real difference with chip welding and the corner radius helps with life. The mills cut well until I do something stupid! This is and a Shear Hog are used on most every job.

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