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Someone told me that tempilsticks has a shelf life and go bad after that. Is that really correct?Thanks,Pete
Reply:Boy ,I do not know I believe I have some around that are several years old but I realy do not use them any more since I got IR temp gun.
Reply:YESI kept some in the shop, low temp 400-500 F rangeThe shop would freeze, the sticks just turned to powder and crumbledIt destroyed any toolbox drawer red paint and rusted the steel below, plus rusted anything in the drawer too.
Reply:Now I will have to go find my old tempil sticks ,havn't used them in years .We use to mark Tube sheets with 300-400-500 so we could tell if a boiler was over heated.
Reply:Originally Posted by 12345678910YESI kept some in the shop, low temp 400-500 F rangeThe shop would freeze, the sticks just turned to powder and crumbledIt destroyed any toolbox drawer red paint and rusted the steel below, plus rusted anything in the drawer too.
Reply:I have some that are 15 -20 years old that seem fine.I prefer them to IR gun for bearing heating/installation.Miller a/c-d/c Thunderbolt XLMillermatic 180 Purox O/ASmith Littletorch O/AHobart Champion Elite
Reply:Originally Posted by jpump5I have some that are 15 -20 years old that seem fine.I prefer them to IR gun for bearing heating/installation.
Reply:I know that over the years I've occasionally come across temp sticks that have been pretty degraded from laying about. It would be my guess that humidity could also be a factor in them going bad.
Reply:Out of curiosity I went to tempil.com to see if they had any thing to say about "shelf life". Turns out that moisture level does play a role in there proper storage.http://www.tempil.com/assets/1/31/en...k_Products.pdfLooks like it's mostly only the 700 F. and above ones that are problematic.Last edited by HT2-4956; 04-21-2016 at 09:50 AM.
Reply:Don't know. I keep mine in the fridge since a 100 degree stick melted on a hot day.Weld like a "WELDOR", not a wel-"DERR" MillerDynasty700DX,Dynasty350DX4ea,Dynasty200DX,Li ncolnSW200-2ea.,MillerMatic350P,MillerMatic200w/spoolgun,MKCobraMig260,Lincoln SP-170T,PlasmaCam/Hypertherm1250,HFProTig2ea,MigMax1ea.
Reply:Originally Posted by thegaryThe reason for this is that an IR gun will give a false reading on anything that is reflective like a shinny bearing race. Temp sticks work well for your application. In my shop I do not have a bearing heater so I use a vat of oil to heat bearings. I put a piece of hot rolled steel down into the oil in the middle and shoot my IR gun onto the piece of steel to get an accurate temp of the oil . I put the bearing in, then heat the oil. When the oil is up to temp so is the bearing. When I was employed by someone else we always used induction bearing heaters. Now that I use oil I like it much better, the bearing is much more uniform in temp and therefor goes on a shaft at lower temps. I actually use the bearing manufacturers temps now of 275 degrees. When using an induction heater at that temp the same bearing would not go on a shaft and would stick so I would heat a bearing to 325-350. That is very close to being too hot. A bearing starts to turn straw colored at about 400 and if it turns color the bearing is junk. I like the extra safety factor that the oil allows. A couple months ago I installed 2 12" diameter bearings on a shaft and they had to be slid on about 12" before they hit their stop. With the oil bath I heated them to 275 and they slid right on. If that had been done using an induction heater I would have had trouble even at 350 degrees
Reply:Gary, I'm confused, not sure where your ideas about measuring temperature seem to change to talking about actual temperature. You say the bearing heated in oil to 275F per the bearing company's recommendation slipped over the shaft, but that if you had used an induction heater you would have had to go to 350F or a little more. I don't get this. Why does the method of heating make a difference to the expansion of the bearing I.D., if you get it to the target temperature, and therefore the desired amount of expansion? Or were you still talking about temperature measurements as opposed to actual temperatures reached? I'm sure I have misunderstood you somehow.
Reply:I would think that if you heat something up in an oil bath you're more assured of having it soaked all the way thru it's thickness to your desired target temperature. Where as if you quickly induction heat it you'll have more of a temperature gradient from the outside to the inside. So in order to insure that the internal temperature was high enough you might have to have the surface temperature (where you can measure it) much higher.
Reply:Now I am confused. I thought the whole idea of measuring temp is to know actual temp. An induction heater does not heat the bearing uniformly all the way around. Most induction heaters you hang the bearing on a bar through the middle of the bearing . One side of the race is right on the cross bar the other side is much further away and therefore does not get as hot. The auto stop induction heater have one temp prob that turns the machine off at what ever temp you set it at. That does not mean the rest of the bearing is the same temp as the spot with the sensor. The induction heaters are fast though . you can heat a bearing in 2-3 minutes with one were as the oil bath probably take 20-30 minutes. Just for an FYI , when heating bearings with an oil bath do not have the bearing sitting at the bottom. I use a canning pot with a wire cage to suspend the bearing in the middle of the oil.Last edited by thegary; 04-21-2016 at 06:08 PM.
Reply:Originally Posted by jpump5I prefer them to IR gun for bearing heating/installation.
Reply:But you can't demagnetize a screwdriver with the oil bathset-up. Miller a/c-d/c Thunderbolt XLMillermatic 180 Purox O/ASmith Littletorch O/AHobart Champion Elite
Reply:Why would you want to DE-magnetize the screwdriver? How would I fish all those tiny screws out of the only crevice in a 10' radius that they inevitably fall into? 😩Sent from my SCH-I605 using TapatalkRyanMiller Multimatic 200 tig/spool gun/wireless remoteMillermatic 350P, Bernard/XR Python gunsMiller Dynasty 350, Coolmate 3.5 & wireless remoteCK WF1 TIG wire feederMiller Spectrum 375 XtremeOptrel e684Miller Digital EliteMiller Weld-Mask
Reply:Originally Posted by xryanDEFINITELY. I see so many people using and IR gun for welding thinking they are doing great work because, "it's electronic and cost more so it's obviously better than that cave man crayon" I've shown many a know it all their IR gun is just about as accurate at reading the temperature of various shiny objects as holding on and counting how many 3rd degree blisters you get is.Unfortunately I don't have that hot day problem, I put stuff in the fridge to warm them up from outside in the winter. Imagine that, following the manufacturers instructions work better than a shortcut! HA! I HATE induction heaters, you might as well use o/a torches to heat up the race. The oil bath is like making hard boiled eggs, it's cooked to the same 212F the whole way through. Induction heating is like frying an egg, the bottom is crispy from 500F skillet and the top is 150F and the yolk is runny for dipping your toast.Frying, good for eggs, no good for bearings.
Reply:While this isn't a bearing being heated up it's illustrative of the theory involved. If you could hang a bearing up and then use the flame off of a weed burner at this kind of distance you could do a good job of bring it up to a nice even heat in fairly short order. If you were going to be doing it on a regular basis you could rig up some kind of swivel assembly to allow you to easily spin the bearing 180 degrees every now and then to more evenly distribute the heat to both sides of it.
Reply:Another example of how you could go about soaking a bearing to a nice even heat with a fuel gas flame. I've got a big chunk of 4140 bar preheating for welding here. Every couple of minutes I moved the burner from one end to the other. And I had it turned down fairly low. Attachment 1409161
Reply:I never said that's how you use a torch properly. I was making an analogy of the extreeme localization of heat from a torch to that of an induction heater. Even still using a carborizing flame to "gently" heat a bearing is playing with fire. (<see what I did there ) Your precision ground expensive bearing has a very small tolerance zone between expanding to fit and being cooked. Sometime best practice is to actually follow the manufacturers installation procedure...Never preheat anything by applying the inner cone of a torch directly to a bearing race or for welding preheat. Wide carburizing flame or weed burner 👍RyanMiller Multimatic 200 tig/spool gun/wireless remoteMillermatic 350P, Bernard/XR Python gunsMiller Dynasty 350, Coolmate 3.5 & wireless remoteCK WF1 TIG wire feederMiller Spectrum 375 XtremeOptrel e684Miller Digital EliteMiller Weld-Mask
Reply:So how do you guys heat you oil, a fry daddy? I suppose something like that would work ok. With a digital temperature controller, you could easily keep the oil a constant temp.
Reply:Yeah, as long as it's an adjustable one. I know some of the cheapo ones are just set to one temperature and who knows what this is.RyanMiller Multimatic 200 tig/spool gun/wireless remoteMillermatic 350P, Bernard/XR Python gunsMiller Dynasty 350, Coolmate 3.5 & wireless remoteCK WF1 TIG wire feederMiller Spectrum 375 XtremeOptrel e684Miller Digital EliteMiller Weld-Mask
Reply:Originally Posted by xryanI never said that's how you use a torch properly. I was making an analogy of the extreeme localization of heat from a torch to that of an induction heater. Even still using a carborizing flame to "gently" heat a bearing is playing with fire. (<see what I did there ) Your precision ground expensive bearing has a very small tolerance zone between expanding to fit and being cooked. Sometime best practice is to actually follow the manufacturers installation procedure...Never preheat anything by applying the inner cone of a torch directly to a bearing race or for welding preheat. Wide carburizing flame or weed burner |
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发表于 2021-8-31 22:07:53