In article dvandam-2207040953520001@sdn-ap-
010tnnashp0277.dialsprint.net,
says...
In article , Ned Simmons
wrote:




Do you have any way of measuring how hot does the spindle
actually gets?

Actually I do. After I sorted out the business with the plug and got
some oil to the bearings (the manual describes obscure type of grease but
my guy at DC Morrison says "straight 30 weight oil") I attached a nice
little magnetic surface temp thermometer to the quill and turned it on at
full spindle speed (3400 rpm).

Within 30 seconds I could feel the quill starting to warm. Within 2
minutes it was acutely warm and at between 4 or 5 minutes the thermometer
was indicating and stable at 130 degrees. The way this thermometer works
it measures temp just above the surface it's attached to. That means the
quill is actually hotter and the bearings hotter still.

If 200 degrees is within allowable operating parameters maybe this is
perfectly normal (normal enough) and I just have to get used to it when
ever running at full spindle rpm.

Other wise the next thing to fiddle with is bearing preload or possibly
consider replacing the bearings.


Keep it oiled and I think it'll be fine. The limiting
factor will be lubrication, and just about any grease or
oil will operate at 200-250F. If there's old grease in the
spindle that may be part of the reason it gets as hot as it
does. If that's the case, I wouldn't be surprised to see
it improve as you continue to run oil thru it. Even SAE30
is pretty heavy at 3400 RPM - the oil for a Bridgeport
spindle is approx SAE10, for example.

Ned Simmons