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Thread: HM46 CNC convserion

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    Default HM46 CNC convserion

    Hello,

    I have decided to get a HM46 and to eventually convert it to CNC
    I chose the HM46 because it is the largest bench mill I can find
    https://www.machineryhouse.com.au/Pr...stockCode=M123
    Please note that I am from Australia, this machine probably exists under other names in other countries. It is larger the the super X3
    I have converted my taig mill to CNC so this shouldn't be super hard except for the Z axis as its a rack and pinion setup

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    Registered ninefinger's Avatar
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    Thumbs up Welcome to the "big leagues"

    Hi Chris,

    Nice choice of machine. Looking at it I think most will know it as an RF-45 or ZX-45. About as big as they get for the desktop variety.

    I don't think the rack and pinion for the Z will matter much as for a machine this size you really want to go to ball screws. In doing so you will end up removing the rack and pinion completely.

    BTW - what are you planning to use - steppers or servos? Always curious to see what others end up doing for their conversions.

    Congrats again.

    Mike



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    Default

    I've never used servos, except in RC toys. I havnt looked into them yet for the conversion. Can I get away with steppers for this machine?
    Do servos have encoders, unlike steppers, so if it gets jammed or what not it will always go to the correct position?
    As I don't have any spare drivers or motors I'll work out whats suitable for me and go from their.
    I run EMC2 with step and direction outputs, do servos work in a similar fashion?
    I dont have much money, considering Z has to be redone I might go for ball screw and servo, X&Y possible just add a stepper, at least then I will have a machine I can start making parts on.
    The parts I make dont need to be super accurate so it should be fine until I get more money



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    Registered ninefinger's Avatar
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    Default

    Quote Originally Posted by chris123 View Post
    I've never used servos, except in RC toys. I havnt looked into them yet for the conversion. Can I get away with steppers for this machine?
    Do servos have encoders, unlike steppers, so if it gets jammed or what not it will always go to the correct position?
    As I don't have any spare drivers or motors I'll work out whats suitable for me and go from their.
    I run EMC2 with step and direction outputs, do servos work in a similar fashion?
    I dont have much money, considering Z has to be redone I might go for ball screw and servo, X&Y possible just add a stepper, at least then I will have a machine I can start making parts on.
    The parts I make dont need to be super accurate so it should be fine until I get more money
    I don't want to tell you to use steppers or use servos - that is a choice you need to make yourself, and a search of the zone will return a million hits on servos versus steppers. At this level servos and steppers are both driven by the same step/dir software so you're good with EMC2. It really depends on you and what you want out of the machine. I ended up picking servos - but I like doing things the hard way!

    I personally think that ballscrews are more important on a machine this size than the servo vrs stepper decision. Regardless of what drives the machine it will be much better off with ball screws due to the reduced friction, with the added benefit of much reduced or eliminated backlash. Cost wise ballscrews aren't too bad either when bought from ebay (ie lookup linearmotionbearing2008 as a vendor) - we don't need ground ballscrews for these machines...

    Good luck.

    Mike



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    Default

    I should be getting the machine shortly as I need it for a job
    Not a good one, but I'll get some money out of it



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    Default

    I should be getting the machine shortly as I need it for a job
    Not a good one, but I'll get some money out of it

    I found a "linearmotionbearing" The ballscrews dont seem that expensive



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    Default

    Hi Chris,

    I've wandered in from the other forum... here is the HM52 build thread

    http://www.cnczone.com/forums/knee_v...version-2.html

    That's the same ebay seller is where I got my ballscrews I had no problems.
    eBay Australia Shop - linearmotionbearings:

    As Mike said, you will be happier with ballscrews in the long run, but it's a lot of extra work and I'm guessing you want to start making parts.

    I'll be watching your project with interest.

    Regards
    Ray



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    Default Aricas Benchtop

    Chris:
    I have been looking through your build with interest. I am currently looking at the same 3 phase HM46 from Machinery house, however i have also found a 3 phase Aricas benchtop machine.

    GEAR HEAD BENCH TYPE MILL DRILL, ARICAS - Ind Tools & Mach : Machinery Geared Head Drilling & Milling Machine : Power and Hand Tools, Tool Repair Store Perth

    I believe its a Tiawan built machine. Its very similar in size. I am looking at converting to CNC next year so just trying to get a feel if this machine would convert over to CNC well.
    Did you consider this machine when looking if so any pearls of wisdom on choice HM48 or Aricas ?

    Rgds ... Roy



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    Default

    Roy,

    The machine you linked is a round column mill. It can certainly be converted to CNC, but instead of being able to utilize the full travel of the entire head like a dovetail column machine, you would be limited to a Z axis travel of only the quill.

    Just an observation.



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    Default another aussi!

    Hey Chris,

    There are a couple of us here on the zone doing Hm46 conversions. I have found them to be pretty close to the rf-45 style mills in the majority of ways. the z axis has a leadscew, driven by some gears down the bottom, i think you maybe mean wormdrive rather than rack/pinion. Definietly Go the ballscrew conversion, Mine just arrived from linearmotionbearings2008 and seem to be pretty good!. they are defintely alot smoother than leadscrews, and more importantly, have very little backlash. I went for the two nuts per axis so i can pre load.

    I am going with 1600 ozin steppers direct drive onto each axis, but the majority of people on here seem to go the servo route for this size mill. I went steppers for simplicity/cost reasons. check out my build thread here for more details.



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    Default Re: another aussi!

    Hi All.
    I have an HM46 and have been keen to CNC it for some time. Just got the go ahead from the boss (Misses)... so time to buy bits... (and read a heap)
    Any estimates of total cost including Steppers or Servos??



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    Default Re: another aussi!

    Hi Kensby,

    I'm in Brisbane. Anyone else doing an HM46 up here? I'd like to connect with locals who are doing it.



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