1. Home
  2. ⏣ General Metalworking
  3. Bridgeport spindle warming up
  4. Page 2

Bridgeport spindle warming up

There is a ring at the very bottom of the quill. This holds the bearings in the quill, and applies the preload to the bearings by pressing the outer races against a ground spacer between them. You really don't want to mess with this unless there is a problem.

Your problem (if any) was the bearings at the top, on the spindle pulley, not the spindle itself. So, I don't think Tom's info is relevant to it at all. I can't see how the bottom bearing preload would affect the driven pulley bearings.

To Tom, I believe Iggy is referring to bearings J-293 in the 1J head drawings, part # 1190232, listed as #207 bearings. And, actually, these bearings may not have been getting hot at all, it may have all been pulley heat.

Jon

Reply to
Jon Elson
Loading thread data ...

DoN's got it right, as usual. I've used them to study energy balances around a rotary kiln. Lower means way lower, like 0.2 instead of

0.95. Rusty steel would read o.k., painted surfaces probably will read way low. Basically, I don't trust 'em except for the most qualitative measurements, even with an emissivity adjustment. With the emissivity adjustment, you can pretty much dial the temperature you want to believe.

Pete Keillor

Reply to
Pete Keillor

Many digital multimeters will accept a thermocouple temperature probe, the common ones being made of thin wire. If one tapes the tip to the mill head, it ought to give a pretty accurate temperature reading.

Joe Gwinn

Reply to
Joseph Gwinn

After a Computer crash and the demise of civilization, it was learned Gunner wrote on Wed, 27 Jun 2007 17:57:43 GMT in rec.crafts.metalworking :

And lubrication. Unless there is a reason for metal to metal contact, some lubrication is in order. I was futzing around the other day, trying to look like I was working while waiting for a part inspection, decided to oil the pencil grinders at the downdraft table. (I know it doesn't get done every shift). One I figured wasn't long for this world, it was getting warm at the business end even without a load. Of course, I could also feel the "rocks" in the bearings when spinning it by hand with no air. OTOH, improved the one by replacing the air hose. Something about having the air hose about half cut through at the unit base doesn't help. (I snagged a bunch of dead pencil grinders, earlier in the year, and had an extra hose. Bwahahahaha! Gave the cut off hose to a co-worker "Don't say I never give you nutin'".)

pyotr

-- pyotr filipivich "Quemadmoeum gladuis neminem occidit, occidentis telum est. " Lucius Annaeus Seneca, circa 45 AD (A sword is never a killer, it is a tool in the killer's hands.)

Reply to
pyotr filipivich

Agreed. I'd trust it to about 1 deg. if new. Iron-constantan (Type J) thermocouples drift on heat cycling over time. When I really want to know, I use a three or four wire rtd, which is mostly what I use for process r&d applications.

Pete Keillor

Reply to
Pete Keillor

I have a couple of the cheap HF units. They've proven to be extremely handy. If you want to measure something shiny, try sticking a piece of black tape on it.

Jerry

Reply to
Jerry Foster

PolyTech Forum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.