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Thread: Hm 46b
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31st Dec 2021, 07:58 PM #1Senior Member
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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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31st Dec 2021, 08:28 PM #2Senior Member
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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.
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31st Dec 2021, 10:48 PM #3
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.
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1st Jan 2022, 11:17 AM #4Senior Member
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shaft OD at the bearing seat is 30mm, bearing ID is 35mm.
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1st Jan 2022, 02:47 PM #5Diamond Member
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1st Jan 2022, 02:54 PM #6Most Valued Member
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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.
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1st Jan 2022, 04:01 PM #7Senior Member
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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.
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2nd Jan 2022, 02:43 AM #8Senior Member
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- Aug 2007
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- Saskatoon, Saskatchewan, Canada
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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
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2nd Jan 2022, 09:18 AM #9
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.
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2nd Jan 2022, 09:40 AM #10Most Valued Member
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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.
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2nd Jan 2022, 12:51 PM #11Senior Member
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- Dec 2020
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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.
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2nd Jan 2022, 01:08 PM #12Senior Member
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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 ).
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2nd Jan 2022, 07:20 PM #13Member
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HM46b
That is just astonishing. Quality control = zero. What morons are assembling these?
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2nd Jan 2022, 08:55 PM #14Golden Member
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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
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6th Jan 2022, 01:35 AM #15
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