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IndustryArena Forum > MetalWorking Machines > Benchtop Machines > started my cnc conversion for Precision Matthews PM-25MV Mill
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  1. #1
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    started my cnc conversion for Precision Matthews PM-25MV Mill

    Hi,

    I started my cnc conversion, I machine all the mounts now I need to order my ball screws next, here is one of many video's i posted look at this one or all Thanks, please let me know or recommend/ helpful tips I should know for this is my first cnc mill conversion and any help i would appreciate it!
    Thanks


    https://www.youtube.com/watch?v=xCGt8fY1hwM

  2. #2
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    Re: started my cnc conversion for Precision Matthews PM-25MV Mill

    I suggest to not machine parts untill you have the purchased components in your hands and verify dimensions first.
    Especiallly if you buy cheap chinese components, dimensions might be out of tolerance.

  3. #3
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    Re: started my cnc conversion for Precision Matthews PM-25MV Mill

    you have a good point, this is a proven plans and why i did it this way, if i ever do this again i will purchased the components first

  4. #4

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    Re: started my cnc conversion for Precision Matthews PM-25MV Mill

    Those like really nice!
    Are you using FK10/FK12 bearing cartridges by the looks of it?
    I'm going down the same route, though I bought all of my electronics/motors/software so far, ballscrews came in today, and my FK bearings plus couplers are a month or so out yet on the slow boat from china, so I haven't started machining anything for the conversion yet.

  5. #5
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    Re: started my cnc conversion for Precision Matthews PM-25MV Mill

    Quote Originally Posted by BrianPM View Post
    Those like really nice!
    Are you using FK10/FK12 bearing cartridges by the looks of it?
    I'm going down the same route, though I bought all of my electronics/motors/software so far, ballscrews came in today, and my FK bearings plus couplers are a month or so out yet on the slow boat from china, so I haven't started machining anything for the conversion yet.
    I'm 3/4 the way through converting one myself using my X2 to make the parts.
    I made my own bearing blocks to accommodate 32x12x10mm 7201-2RS Angular contact bearings for my 1605 screws.
    Seeing how well they work I wouldn't go back to anything else.
    I've packed my double nuts with some aluminium foil to make them tighter (they do now have a little drag). I've only got my Y axis properly set up atm but with the packed nuts and AC bearing combination my backlash has shown >0.001" (0.02mm).

    Once this is finished I'll use it to change my X2 from thrust to AC bearings.

    I went with 1100oz Nema 34 motors so added extra fixing points to the base and table for the bearing mounts. A fair amount of weight comes with those 34 size motors!

  6. #6
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    Re: started my cnc conversion for Precision Matthews PM-25MV Mill

    hey brain,
    yes i when with FK/FF10 and 12 they have Angular contact bearings/ who did you buy your ballscrews from?

  7. #7

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    Quote Originally Posted by rmachinist View Post
    hey brain,
    yes i when with FK/FF10 and 12 they have Angular contact bearings/ who did you buy your ballscrews from?

    https://www.ebay.com/itm/PM-25MV-cnc-conversion-kit-precision-matthews-balls-crews-machined-as-drawings-/253926681285
    They took about a week to get in from China, which was faster than I expected.
    I’m still waiting for couplers and bearings.

  8. #8
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    Re: started my cnc conversion for Precision Matthews PM-25MV Mill

    Quote Originally Posted by BrianPM View Post
    https://www.ebay.com/itm/PM-25MV-cnc-conversion-kit-precision-matthews-balls-crews-machined-as-drawings-/253926681285
    They took about a week to get in from China, which was faster than I expected.
    I’m still waiting for couplers and bearings.
    Nice. I may have gone that route if I'd noticed them.
    I've over complicated mine due to the pre made sizes I could get at the time. Gone DFU1605 all round.

    Having grief getting my Y axis gib set correctly due to being like a slight banana. Tight when fully engaged but once it goes forward and saddle over hangs it goes loose and saddle is twist able (wobbles).

    Any suggestions?
    Daz.

  9. #9
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    Re: started my cnc conversion for Precision Matthews PM-25MV Mill

    Quote Originally Posted by BrianPM View Post
    https://www.ebay.com/itm/PM-25MV-cnc-conversion-kit-precision-matthews-balls-crews-machined-as-drawings-/253926681285
    They took about a week to get in from China, which was faster than I expected.
    I’m still waiting for couplers and bearings.
    I bought the same one 3 days ago! a week thats fast! let me ask i'm still waiting on a tracking number did chai provide one and what mail carrier did he use?

  10. #10

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    Re: started my cnc conversion for Precision Matthews PM-25MV Mill

    IIRC, it was DHL, and there was a tracking number.

    ETA: I just checked my records... I ordered on the evening of 5/31, received the screws on 6/11, and was contacted by DHL with tracking info on 6/8.

  11. #11

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    Re: started my cnc conversion for Precision Matthews PM-25MV Mill

    How was the quality on your PM25? I am in the middle of my conversion on the 30MV. The biggest issue was when I moved any of the axis before I tore it down there was a horrible grinding noise from the grease being loaded with sand, I am guessing from the castings. Also I received it half the screws were loose including the largest one holding the column on. I will a little shocked when I was able to remove two of the 4 bolts by hand. All the lead screw except the y axis had powder coat on them along with a couple of the mating surfaces. One of my Z axis bearing was missing a ball. I am just unlucky or do I need to lower my expectations? I know for the price one can't expect perfection but from all the review I read I was expecting a bit better then what I got. I also have a lathe from them inbound on the slow boat and I am a bit concerned. Should I just plan on doing a full tear down on that as well to get everything cleaned up? I know there is no way I would have ran this mill out of the box.

    I have everything for my conversion sitting in the corner taunting me. I don't want to cut into the base until I get the conversion kit. David and ArizonaVideo is diligently working on them and I think it should ship this week.

  12. #12
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    Re: started my cnc conversion for Precision Matthews PM-25MV Mill

    Yes, working on them
    youtube videos of the G0704 under the name arizonavideo99

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