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Thread: New gear for the Kearns HBM
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17th Oct 2020, 01:39 PM #1Senior Member
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New gear for the Kearns HBM
SAM_0714.jpgSAM_0715.jpgSAM_0716.jpgHello from this old bloke.
Finally a start on fitting the repaired worm wheel. First pic is from the rear or feed side. This shows one of the magic bearing spacers. A long look at the owners manual has this spacer on different sides of the thrust bearing in ea of 2 pics. The spacer under the bearing nut is missed completely. Second pic and you can just see the cover tube for the tower shaft and worm pinion. There is no oil seal there or on the main/counter shafts. The oil is allowed to run past the bearing and collects behind the cover where it drains back down to the box. Third pic is the 2 shafts with gears and bearings. It's a 3 hour job that will take 3 days at least. A lot of cleaning is needed as the bronze chips have filled many oil galleries and jammed up the works. Worse luck the only way to see if assy is right is to put it together and check mesh. The bearing nuts and gears are locked by grub screws and taper pins.
I'll try to take more pics as I go.
Regards
BC
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18th Oct 2020, 10:18 AM #2Senior Member
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And the HBM wins.
Hello again from the old bloke.
Well all I can say is the bloody mill beat me solidly. I struggled to get the main shaft in as the rollers kept falling out of place. Once it was in place the thrust bearings were just too tight to go home. Both inner and outer races. This caused a short cry.
Next weekend it's time for making some pullers and install tools. Dry ice and heat. I mic'ed the bearings and the new items were within 2 tenths of the oldies.
I'm not used to the work and feel used up.
regards
BC
More info. Very similar to working on the Mazak lathe I found the hardened parts to be distorted. Obviously not ground after hardened. The tubular main extension for the main shaft that carries the drive gear for power feed is oval by about 10 thou in 1.75" diameter.
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19th Oct 2020, 09:09 AM #3Most Valued Member
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Sorry, is that distorted part factory original?
Reason I ask is, I own a Kearns S type HBM and it's immaculate. Wonderfully built machine. Ditto a friend of mine's machine, bit newer than mine, worse paint job but still mechanically perfect.
I find it hard to believe Kearns would have let a critical part be out of spec by that much, is all.
PDW
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