Vintage flat belt grinder
- Thread starter Sawmill7
- Start date
slowtwitch73
Well-known member
That's nice... tool rests even.
Doubt there's any rpm it 'should' run at. Buffing and polishing is usually higher rpm.. make sure the babbit bearings and spindle are in good order and well lubed... do some test runs and check the temp.
Doubt there's any rpm it 'should' run at. Buffing and polishing is usually higher rpm.. make sure the babbit bearings and spindle are in good order and well lubed... do some test runs and check the temp.
Firebrick43
Well-known member
I have seen some. They were designed to be used with line shafts.
More than likely they are Babbit bearings. The question is what alloy is it? Babbit can be ran at 100-1000 surface ft/min speeds depending on the alloy.
If we assume the arbor shaft diameter in the bearing block is 5/8 diameter then at 3600 rpm (what many modern bench grinders turn) the sfpm is about 530 ft/min Without knowing the alloy I would not use that speed. Without wheel guarding I would not use that speed with grinding wheels.
Many people have been maimed or killed by exploding wheels which is why guarding is now mandatory on machines with stone and vitrified wheels.
If you just run Cotton buffs 1800 rpm would give you 265 ft/min of the babbit bearings. A 8" buff would be a little slow at 1800 rpm and a 10" buff just right but don't lay into it too hard.
More than likely they are Babbit bearings. The question is what alloy is it? Babbit can be ran at 100-1000 surface ft/min speeds depending on the alloy.
If we assume the arbor shaft diameter in the bearing block is 5/8 diameter then at 3600 rpm (what many modern bench grinders turn) the sfpm is about 530 ft/min Without knowing the alloy I would not use that speed. Without wheel guarding I would not use that speed with grinding wheels.
Many people have been maimed or killed by exploding wheels which is why guarding is now mandatory on machines with stone and vitrified wheels.
If you just run Cotton buffs 1800 rpm would give you 265 ft/min of the babbit bearings. A 8" buff would be a little slow at 1800 rpm and a 10" buff just right but don't lay into it too hard.
Whats the name on that?
steel 35
Well-known member
I'm thinking; just as fast as you can pedal.
rancherbill
Well-known member
The max speed is a function of the wheels you are using. All new grinding wheels come with a MAX RPM on the wheel. You don't want them coming apart and I believe polishing wheels come with a max rpm
RTM
Well-known member
American Machine and Tool Record
books.google.com
and babbit bearings need oil, not grease
tombell572
Well-known member
That's a nice one that has survived without a V pulley replacing the original. Beautiful original oil cups too. If you're a hit and miss guy you would probably agree that would look sweet running off a line shaft.
Tom B.
Tom B.
wrenchguy
Well-known member
then you know to use non detergent oil.
Firebrick43
Well-known member
Why would a total loss lube system care about if the oil was non detergent or not. It only matters in recirculating lube systems without filters and sumps were dirt can settle out.