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Thread: AL336 main bearing confusion
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8th Mar 2018, 03:55 PM #1Noobster
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AL336 main bearing confusion
G'day everyone.
I own a hafco al336 centre lathe and it screams like a banshee! Has always been noisy but I wish to replace the existing bearings in the lathe with some decent brand name bearings. I don't know anything about bearing numbers or which type!
I have the parts list for this lathe and the main bearing is a D7212 bearing but I cannot for the life of me find any information out about this part.
First I rang Hare and Forbes and asked about this bearing but the best answer he could give me was to contact a bearing place.
After talking to the bearing place they came up with SKF 7212 BEP bearing which after looking at various pictures of this bearing does not resemble the bearing in the lathe. The existing bearing runs roller bearings instead of ball bearings. Perhaps it is the correct bearing and I am confused for no reason.
My question is this:
Does anyone here have any idea about his bearing or where to find them?
Maybe someone knows of a site with a similar lathe where they have changed out the bearing and I can look for more info?
Thanks and regards Peter Kosten.
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8th Mar 2018, 05:34 PM #2
If you are serious about changing the bearings I would remove them from your lathe clean up and take them to the bearing place and let them do the measuring and supply you with the correct new ones. Identification is crucial for fitment.
Just do it!
Kind regards Rod
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8th Mar 2018, 05:40 PM #3
There usually splash feed to lubricate them, is the oil level up?
Yourt bet is to remove the bearings and take them to a bearing place.
Saying that I searched for precision tapered roller bearings for my mill, only one place could supply them in P5, as the others took P5 as clearance not precision.
I've taken my bearings out of my similar lathe and there light press fit.
I could take a photo of my manual, but a Toolex lathe might be differentUsing Tapatalk
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8th Mar 2018, 06:15 PM #4Noobster
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Thanks for the prompt reply. Oil is well maintained and recently replaced.
I had wished to order the parts and do it all in one operation but removal and taking them to a bearing place is an option as there are a few in my town
and probably the best way to do it. I had hoped to find out what sort of hit my pocket would need to take before I commit.
Time I think to bite the bullet and dismantle my head stock!
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8th Mar 2018, 06:22 PM #5Most Valued Member
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Have you checked the preload on the brgs, they might just be a wee bit tight ?
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8th Mar 2018, 06:48 PM #6
I agree taper roller bearings don't usually squeal.
The bearings for my mill are smaller than my lathe, for 4 bearings (2 spindles horizontal and vertical)was $800.
Narrow it down before buying spindle bearings.Using Tapatalk
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8th Mar 2018, 06:51 PM #7
How old is this lathe?
Using Tapatalk
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8th Mar 2018, 07:05 PM #8
The AL3336 lathe description reads
Adjustable taper roller bearings support the spindle
Roller bearings are what you appear to have. Nothing surprises me when it comes to Chinese manufacturing.
Some questions first.
Have you had the top cover off your lathe yet?
Have you checked your lathe for the correct grade and quantity of oil?
I would surmise the lathe a similar splash lube system to mine, as they are almost identical in external appearance. A small internal gutter catches the splashed oil from the cover and channels it around to the holes supplying bearing housings.
Warning at this point.Do not be tempted to flick the jog button and flick it over without the cover in place. I can assure you the splash system performs exceedingly well.
What I found was that a loose portion of the sealant had partially blocked the gravity feed hole to the inboard bearing.
I gave mine a gutful of Castrol Hyspin and not touched it since.It still rattles and clangs but has done that since day one.
Some of the above may be possibly the reason for the racket but the lathes are inherently noisy anyway.My lathe is a Metal Master 1236 circa 2007.
When I made inquiries about non Chinese precision lathe bearings the answer came back they were 1/3rd the original cost of the lathe.
I never bothered after that and the lathe still runs.
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8th Mar 2018, 07:57 PM #9Most Valued Member
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Peter I had an AL336 for a few years and l was just thinking about the tin pate on top of the apron, part No 4 page 23, if you don't seal this plate your apron will get coolant and swarf in it.
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8th Mar 2018, 10:03 PM #10Senior Member
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8th Mar 2018, 10:18 PM #11Pink 10EE owner
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It is not the change gears being too tightly meshed? They can really howl.
It is just not usually bearings. I know they often get the blame, but more often then not they are fine.
If they are 7212 bearings, watch you do not make them all fall apart when installing/removing them. Angular contacts have a tendency to fall to pieces if pressed the wrong way.Gold, the colour of choice for the discerning person.
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8th Mar 2018, 11:34 PM #12Senior Member
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What chambezio said. In the process of replacing my bearings, too them all out, seals etc, clips, placed in seperate ckick lok bags and took them to a bearing place, three weeks later and $700 i have them all in, ready to make stuff again. Know its daunting when you open it up and look, take pics, lots of them, then work backwards on reassembly.
DD
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9th Mar 2018, 09:12 AM #13Most Valued Member
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If your spindle bearings are so shot as to be making a noise, I would suspect it would affect your surface finish on any work you have turned on the machine. Have you been happy with the surface finish attained on this machine?
Proper P5 rated bearings for your machine from a reputable bearing supplier (NSK, NTN, Timken SKF, FAG, etc) will not be cheap. The source of the noise may be from one of the many other bearings in the headstock, which are significantly cheaper. Does it make the same noise no matter what gear you choose? What about in a neutral position? If you are careful, you can place one of the gear selectors inbetween gears and effectively find "neutral" it's not designed for that but you can use it to your advantage in troubleshooting problems.
Remove the drive belt and try again, could it just be an electric motor noise?
What about when under load? If you are performing a heavy cut (heavy for your machine that is) does the noise change?
FWIW, I replaced ALL the bearings in my lathe about 5 years ago including the 2 P5 spindle bearings. The headstock was filled with old casting sand and it destroyed the spindle bearings. I have a photo somewhere of my headstock as a bare casting with nothing else. I stripped and repainted the inside with POR 15 paint. and replaced the spindle bearings with FAG P5 bearings. They were not cheap but I hunted around and got a good deal, one from the US and one from UK. They were about $150 each, delivered. Brisbane bearings quoted me $480 for one. Changing the bearings made a drastic improvement on the surface finish I was able to obtain but my bearings were totally flogged, but they still did not make a bad noise.
Cheers,
SimonGirl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.
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9th Mar 2018, 01:11 PM #14Diamond Member
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9th Mar 2018, 01:26 PM #15Noobster
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