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  1. #1
    Right then been a very very very quiet on the build front for a good while now for very good reason. To remedy this i thought i would kick off with what the immediate future plans are.
    I need to downsize my workshop a bit to move stuff out of the house to make way for our new arrival (no not the new mill?). To do this i took the decision to sell the Bridgeport as that take the most room up and if need be i have access to another. It really pains me as that is my favorite toy :cry:. Before i have had chance to list her i got the chance of an Arboga, great machine but does come with some challenges. It is in great shape and now in pieces on my workshop floor ready for when i can start.

    Bad points:

    1. 415v two speed motor - found nothing to say i can rewire for 240v, many have tried
    2. Spindle has an MT3 taper with a locking ring around the base as there is no way to put a draw bar because of the gearing above (my locking nut M62x1.5 is missing so will need to make a new one)
    3. The drill chuck is stuck in the taper (looks like it has never been removed since new)
    4. Table is not massive

    Good points:

    1. Very sturdy machine and knocks spots off most medium size mills, even modern ones
    2. Big enough for most things i play around with
    3. Everything is metric
    4. Takes up very little room
    5. 20" of gap between bed and spindle for those tall jobs
    6. Lots of space to hide anything and everything
    7. Quill has 140mm of movement which means i can run that as my Z and leave the column manual for different job sizes

    Plans:

    1. Strip it down
    2. Clean and repaint machine
    3. Make a new nut for the M62 thread (In case i need anything MT3)
    4. Make an ER32 collet holder to fit over the M62 thread instead of using the MT3 taper
    5. Pull the motor windings that are built into the machine and retrofit the guts from a 3phase 1HP 2800rpm doner. I will loose the two motor speeds but will get this back from the VFD control and will still have two mechanical speeds to play with.
    6. Use 20x5 ballscrews on the X and Y. Still not made my mind up about the Z?
    7. May need to make some new gears for the head but until i get it running will not know. The ones i may need to replace will be made out of tufnol. This will keep that head nice and quiet.

    So far:

    1. Purchased machine
    2. Ordered ballscrews
    3. Sourced new switches and things
    8. Have a 3phase motor (only 1400rpm) to test theory of swapping over gubbins.

    This is not going to be a quick project as my new son is due home next week after being born 9.5wks early. This has taken most of my time up as i have been left to look after the other kids and work full time. In the end i may loose my bridgeport which i still need to sell but will have a CNC mill.

    Lets see if i can be better at updating this log with more detail and pics than before :tup:
    If the nagging gets really bad......Get a bigger shed:naughty:

  2. #2
    Answers to plans.

    3/4: Don't bother, hit and miss whether you will get run out from just a thread and no register.
    Instead get a standard MT3 ER32 collet chuck and machine a groove in it with carbide tooling and fit a circlip to hold the washer and the M62 nut.

    BTW I have a short threaded test piece with the Arboga thread on it, OK if you want to borrow it or if you are dead stuck I can make you a threaded sleeve.


    5:You could always buy a 440 v 3 phase VFD feed it 440 v single phase from a yellow brick wired backwards and the earth centre tapping removed and use this as 440 v in but de-rated. You can pick 440v input vfd's quite cheap
    John S -

  3. #3
    Quote Originally Posted by John S View Post
    Answers to plans.

    3/4: Don't bother, hit and miss whether you will get run out from just a thread and no register.
    Instead get a standard MT3 ER32 collet chuck and machine a groove in it with carbide tooling and fit a circlip to hold the washer and the M62 nut.

    BTW I have a short threaded test piece with the Arboga thread on it, OK if you want to borrow it or if you are dead stuck I can make you a threaded sleeve.


    5:You could always buy a 440 v 3 phase VFD feed it 440 v single phase from a yellow brick wired backwards and the earth centre tapping removed and use this as 440 v in but de-rated. You can pick 440v input vfd's quite cheap
    I also have a Arboga U2508, Have you made the modification with the circlip on the ER32, is it possible to have a photo on the modification?

    /Doger

  4. #4
    Hi guys,
    New to this group.
    Just got the Arboga u2508 mill and I am missing the spindle nut.
    Got an m62x1.5 nut from a supplier in order to fabricate the collar but the m62x1.5 isn’t correct.
    Can anyone confirm the thread pitch ?
    Or better still has anyone got a spindle nut for sale or know where I can source one or have one made.
    Thanks in advance.
    Jon

  5. #5
    Hello
    it is correct the m62x1.5 isn’t correct, the name is M62 but the thread is SAE 20, wierd i know
    i bought a nut from suplier here in sweden for about 1 week ago and they told me this, and i have also checked this for about 5 minuts ago..=), i will come back with e-mail and what company you can buy the nut, one moment..=)
    but it is bastards out there so to be sure, buy i thread checker tool and try the SAE 20 on the spindel threads.
    the SAE 20 is very similar to 1.25 metric threads, so i think that will work to, but it is SAE 20

    Click image for larger version. 

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    Last edited by doggydoggen; 07-11-2017 at 10:06 PM.

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  7. #6
    Quote Originally Posted by doggydoggen View Post
    Hello
    it is correct the m62x1.5 isn’t correct, the name is M62 but the thread is SAE 20, wierd i know
    i bought a nut from suplier here in sweden for about 1 week ago and they told me this, and i have also checked this for about 5 minuts ago..=), i will come back with e-mail and what company you can buy the nut, one moment..=)
    but it is bastards out there so to be sure, buy i thread checker tool and try the SAE 20 on the spindel threads.
    Many thanks,
    That’s appreciated.

  8. #7
    Quote Originally Posted by doggydoggen View Post
    Hello
    it is correct the m62x1.5 isn’t correct, the name is M62 but the thread is SAE 20, wierd i know
    i bought a nut from suplier here in sweden for about 1 week ago and they told me this, and i have also checked this for about 5 minuts ago..=), i will come back with e-mail and what company you can buy the nut, one moment..=)
    but it is bastards out there so to be sure, buy i thread checker tool and try the SAE 20 on the spindel threads.
    the SAE 20 is very similar to 1.25 metric threads, so i think that will work to, but it is SAE 20

    Click image for larger version. 

Name:	Arboga Retention collar as supplied.jpg 
Views:	585 
Size:	15.7 KB 
ID:	23162Click image for larger version. 

Name:	Arboga-Spindle-nut-chris.jpg 
Views:	632 
Size:	74.5 KB 
ID:	23163
    Thanks buddy.
    I actually turned a spindle nut and cut the threads myself on my lathe. Knurled the upper portion to make it easy to fix/remove.
    Turned the washer/collar too.
    Actually an easy job and it works a treat.
    Many thanks for the drawings and if anyone is stuck I’ll turn and thread a nut for you.
    I’m also Well through with building a 240v to 415v phase converter to run it, an interesting project on its own.
    Last edited by Jonkil; 11-12-2017 at 08:25 PM.

  9. #8
    This is the spare part number for the nut, 2T03378
    and here you have the info on company that sells it.

    Machinery Scandinavia AB
    Tungatan 10, 570 83 Rosenfors, SWEDEN
    +46(0)495-49708
    E-mail: [email protected]
    Web: www.mscab.se

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  11. #9
    Yes, I know.
    Their supplier in the UK want €262 for it !
    Will have to go for it I suppose.

  12. #10
    Hi John

    I did look at the options for the motor similar to what you are saying but i like things to be neat and tidy. The casting on the head fits a standard frame so should not be an issue swapping the guts over from a doner motor. I may even find that i can pull some more wires out on the existing (split the coils) which only has 6 coming out? will get to that once i can pull it. As for the tooling like you say just mod standard arbors but will still have a go my way as it will make things nice and easy, with an er chuck and a facing mill should not need much else.

    Back to the motor if all else fails i already decided just to chop the lot off the top and fit a motor on top with a pulley going to the spindle. I can then fit a draw bar :naughty:

    John thanks for the offer of the test piece but i should be ok on that front.
    Last edited by Swarfing; 19-03-2012 at 12:17 AM.
    If the nagging gets really bad......Get a bigger shed:naughty:

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