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Thread: Hm 46b

  1. #1
    Join Date
    Dec 2020
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    Geraldton Western Australia
    Posts
    132

    Default Hm 46b

    Purchased this mill new in Nov 2020, only done about 3 hours work until today. Machining a gearbox housing and it started to chatter, shut it down and found the spindle had excessive play .
    Considering I've had it for a year and the logistics of trying to get warranty and/or having to pack it up and send it back to H&F in Perth, I pulled the spindle out ( 10 minute job ) and this is what I found .
    The tab washer has lost 1 tab, the nut was loose and the top bearing was toast, never mind that it's not even the right size! Guess the QC inspector wasn't there when they put this one together!
    Will talk to the bearing man on tuesday and see what he can supply, otherwise going to have to deal with H&F.
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  2. #2
    Join Date
    Jul 2007
    Location
    Perth
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    332

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    I would send H&F Perth a nasty gram detailing what you have found with plenty of pic's and copy their head office in Sydney, this would be irrespective of whatever fix you are able to come up with. Point out you needed to use the machine so returning for repair was not practical in the short term. Good luck with it. Alan.

  3. #3
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,439

    Default

    Hi Guys,

    Just a guess looking at the pictures, has the missing tab broken off and ended up in the bearing, because it looks as if the bearing has spun on the shaft !
    Best Regards:
    Baron J.

  4. #4
    Join Date
    Dec 2020
    Location
    Geraldton Western Australia
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    132

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    shaft OD at the bearing seat is 30mm, bearing ID is 35mm.

  5. #5
    Join Date
    Sep 2006
    Location
    Australind , WA
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    58
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    1,277

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    Quote Originally Posted by bigcam View Post
    shaft od at the bearing seat is 30mm, bearing id is 35mm.

    omg......

  6. #6
    Join Date
    Nov 2008
    Location
    North Brisbane. Qld. Australia
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    70
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    1,511

    Default

    How the hell did they manage that. This calls for a full refund if that is the case. Been trying to work out how it worked at all.
    Nev.

  7. #7
    Join Date
    Dec 2020
    Location
    Geraldton Western Australia
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    132

    Default

    Worked with a drill chuck because there was no side loading and the lower bearing was taking the load. When I started milling the side load caused the spindle to move about ( 5mm bearing gap ) resulting in the tab breaking off the lock washer and the nut coming loose = no bearing preload.

  8. #8
    Join Date
    Aug 2007
    Location
    Saskatoon, Saskatchewan, Canada
    Posts
    292

    Default

    Expands the meaning of a slip fit doesn't it?

    The seller should foot the bill for opening up a new machine and checking the bearing fit is correct and then shipping that one to you or replacing it with the next model up, all on their dime. Makes you wonder if all that model of those machines are the same.

    Pete

  9. #9
    Join Date
    Aug 2008
    Location
    Adelaide
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    68
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    1,373

    Default

    Quote Originally Posted by Bigcam View Post
    shaft OD at the bearing seat is 30mm, bearing ID is 35mm.
    It would be interesting to measure the offending bearing height and see what markings are on the shell.

    The parts list specifies a 30306 bearing (part # 56) which is 30mm ID, 62mm OD and 17.25 height for the top of the spindle. The bearing at the top of one of the gear shafts (part # 29) is a 6007 bearing which is 35mm ID - which matches what the OP has measured, 62mm OD - which would fit in either housing, but a height of 14mm.

    I wonder if they've mixed up the bearings when picking from the parts boxes during assembly.

  10. #10
    Join Date
    Jul 2006
    Location
    Athelstone, SA 5076
    Posts
    4,255

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    even though its out of its warranty period....its still covered by Australia's Statutory Warranty requirements!

    That mill was not "Fit for Purpose" and hence H&F should be held accountable.

  11. #11
    Join Date
    Dec 2020
    Location
    Geraldton Western Australia
    Posts
    132

    Default

    upper bearing should have been #30206/P5. 30mm ID/ 62mm OD/ 17.5mm high.
    they fitted #33007/P5. 35mm ID/ 62mm OD/ 21mm high.
    the bearing height isn't an issue, could have put a 25mm high one on as there is plenty of thread above the bearing.
    I will ring H&F on Tuesday and organise a warranty claim, hopefully they can just supply a new spindle. I don't really want to have to pack it up, take it to our yard, load it on the truck and then wait until the 13th of Jan for the next Perth run. If they will do the spindle, I can source a new bearing locally and put it back together and finish the gearbox while waiting for the new spindle.
    Attached Images Attached Images

  12. #12
    Join Date
    Dec 2020
    Location
    Geraldton Western Australia
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    132

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    This is a HM46B which is the same as a Grizzly G0755, just no power feed on the Z axis. The upper bearing is 30206/p5 ( 30/62/17.5 ) and the lower is 30207/p5 ( 35/72/18.25 ).

  13. #13
    Join Date
    May 2018
    Location
    Cairns, Qld.
    Posts
    70

    Default HM46b

    That is just astonishing. Quality control = zero. What morons are assembling these?

  14. #14
    Join Date
    May 2020
    Location
    Willowbank QLD
    Posts
    517

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    Quote Originally Posted by Halifax614 View Post
    That is just astonishing. Quality control = zero. What morons are assembling these?

    I don't think the people assembling these are morons. You will most likely find they are quite nice people that are working long hours under very average conditions just trying to put food on the table but paid bugger all and have learnt to just do as they are told and don't buck the system.

    Steve

  15. #15
    Join Date
    Jan 2004
    Location
    Mackay North Qld
    Posts
    6,446

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    Quote Originally Posted by Halifax614 View Post
    That is just astonishing. Quality control = zero. What morons are assembling these?

    Not morons ,but almost slaves, press ganged labour.

    Possibly farm labourer types ,forcibly shipped from the country in to the manufacturing cities. Working long hours , with poor pay and housed in communal digs living away from their own families.
    Given minimal training training and no real incentive to perform why should they give a rats about what they are making?. These are generic products all cloned of basic pattern and given different paint jobs and faux brands.

    The workers might see their people once or twice a year.

    I am sure if any one of us were in that same position the outcome would be the same.

    The factory owners often linked to CC party members don't give toss, there is no comeback on them as complaints will never reach back to their levels.

    Of course not all are like this but there are enough to be too many.

    If we keep buying their poorly made products, they will keep making them.

    Grahame

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