Brandenberger
Hot Rolled
- Joined
- Sep 19, 2017
Hi,
Been trying to diagnose a surface finish problem with my B&S 510 surface grinder.
I've tried several wheels, fresh diamond, etc., and the finish is good other than a small x-axis chatter which is diminished if I traverse very slowly in the x-direction. There were several potential sources... including a single phase motor which is rigidly mounted to the motor platform. I have the old GE 3-phase motor and I'll put that on a VFD and see if that helps.
However, to diagnose I indicated the spindle and found .0001" runout. So I've pulled the spindle out of the machine and when turning the spindle slowly by hand, there's a particular spot which doesn't turn as smoothly (feeling like there must be an imperfection in the bearing) always at the same rotational position. At this point the indicator jumps the .0001", then slowly returns to zero over the 360 degree rotation.
I'm guessing other than using it as-is (which seems to produce good parts, just not great surface finish), the only answer is pulling apart the spindle and replacing what are expensive bearings? Anyone know what the bearing specification is for this spindle?
Curiously I note there's a hole on the top of the spindle toward the rear (which would only be accessible when the spindle is removed), and there's a Felt Wicking in the parts manual (part 466-178) which seems to be in that location. See picture with red circle.
The manual says the spindle is greased for life... so I'm assuming this wick isn't mean to be oiled. I wonder what this is for? Maybe for air pressure balancing as it warms and cools...
Final question: anyone have a good source for the O-rings (part 466-64) for the oriflex drive? I've talked to B&K, they want $24 for each of 6 O-rings. I ordered some from MSC, but unfortunately theirs are standard .275" cross section, while the B&S ones are some proprietary maker apparently and are a true .250". I've looked at standard metric sizes as well, no dice.
Thanks,
-Phil
Been trying to diagnose a surface finish problem with my B&S 510 surface grinder.
I've tried several wheels, fresh diamond, etc., and the finish is good other than a small x-axis chatter which is diminished if I traverse very slowly in the x-direction. There were several potential sources... including a single phase motor which is rigidly mounted to the motor platform. I have the old GE 3-phase motor and I'll put that on a VFD and see if that helps.
However, to diagnose I indicated the spindle and found .0001" runout. So I've pulled the spindle out of the machine and when turning the spindle slowly by hand, there's a particular spot which doesn't turn as smoothly (feeling like there must be an imperfection in the bearing) always at the same rotational position. At this point the indicator jumps the .0001", then slowly returns to zero over the 360 degree rotation.
I'm guessing other than using it as-is (which seems to produce good parts, just not great surface finish), the only answer is pulling apart the spindle and replacing what are expensive bearings? Anyone know what the bearing specification is for this spindle?
Curiously I note there's a hole on the top of the spindle toward the rear (which would only be accessible when the spindle is removed), and there's a Felt Wicking in the parts manual (part 466-178) which seems to be in that location. See picture with red circle.
The manual says the spindle is greased for life... so I'm assuming this wick isn't mean to be oiled. I wonder what this is for? Maybe for air pressure balancing as it warms and cools...
Final question: anyone have a good source for the O-rings (part 466-64) for the oriflex drive? I've talked to B&K, they want $24 for each of 6 O-rings. I ordered some from MSC, but unfortunately theirs are standard .275" cross section, while the B&S ones are some proprietary maker apparently and are a true .250". I've looked at standard metric sizes as well, no dice.
Thanks,
-Phil
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