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23rd April 2019, 03:30 PM #1Most Valued Member
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- Aug 2015
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bearing damage on jointer cutter head
Hi all,
Some time back i was gifted a Gilbro saw table/jointer combination machine. Apart from some surface rust and wood chips/crud from 50 years of use its in pretty good condition. None the less i have done my usual thing of totally stripping, cleaning and replacing the bearings. Up until now there has been nothing to repair and thought i got out of it scott free! However, when it came to the jointer i noticed considerable play on one side of the cutter head. It turns out that for some time the shaft had been turning on the bearing, wearing down the shaft. Not an uncommon problem with neglected machines.
The unworm part of the shaft is 19.05mm (3/4") which takes an RMS6 bearing however the worn part where the bearing seats is 18.68mm so 0.37mm under sized
Anyway i guess i have several options;
1: Cheap and cheerful would be to use a high strength high viscous loctite
2: turn down the shaft, press a sleeve on and turn back to 19.05mm
The 2nd option is a little trickier than i thought, the centre holes at each end of the cutter head do not hold the cutter concentric when held between centres. For some reason, its out by approx 0.25mm tir.
This is not terribly important for the blades because they are placed in position using a jig the places them at even height relative to the table but is important for vibration as it spins at approx 4600 rpm. So i want it to be as concentric as possible.
Rotating the cutter held on V blocks at the bearing locations yeilds a tir of about 0.05mm which seems acceprable.
If i hold one end in the 4 jaw at the bearing location, where would i support the other end? Cant use a steady because its where i want to turn down?
2nd pic you can see the worn section and a small amount of galling.
Any ideas?
Sent from my SM-G900I using Tapatalk
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