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Hello, Does someone have ever tried the spiralock threads. I read they work well but I'd like to have a feedback from the practical world.

Hello Folks, Could someone tell me how to identify a poor lubrication with fft? I've been told that noise in acceleration is a good sign but I have no more details. I'm looking maybe for an articles that develop on this subject. Vibration litterature I have doesn't say nothing about...

Hello folks, I just breakdown a spindle. On one side the grease (NBU 15) was white, which is the initial color, but on the other side, the grease turned yellow. Does someone know why? Overheating? Thanks,

Hello Folks, I've been really surprised when I called my malleable cast iron grade 65 manufacturer and he wasn't able to give me the exact coefficient of thermal expansion. It seems that this value is quite hard to find. Does someone know the value or a great reference where I...

Hello everyone, I'd like to discuss with you about the bearing and end cap torque for different bearings. For angular contact bearings, I have seen different methods. When I looked in the SNFA book, which is to me the best reference for angular contact bearings, they explain how...

Hello folks, I'm looking for a specific value regarding any kind of steel but Hardox 400 would be the best. So, I talked to the hardox people. Here is what I asked : Here are the information on my application : -It’s the same principle as a plain bearing...

Hello Folks, My question is about a silo extractor. I'm designing the bearing and I was interested on the loads on the extrator worm screw that ''extract'' the silo's stuff. When the extractor is static the worm screw carry the silo's stuff weigth but when the worm srew is running...

Hello, I'm designing a big plain bearing with steal Scandia 400. I was wondering if someone has an idea of the wear factor of this steal or something close. Thanks for your help,

Hello, I just caught a signal with 1x to 30x rpm harmonics on a spindle. This is the first time I see that. I suspect that the spindle housing is loosened in its fit (this is a cartridge spindle). Have someone already seen this before? Thanks for your help,

Hello, I was hoping maybe someone could have an idea on a failure I just had. A vibration analysis has been done a week ago on a spindle and everythink was looking ok. I just had a call this afternoon reporting a spindle failure. Can someone has an idea on what could have caused this...

Hello Folks, My question is about a silo extractor. I'm designing the bearing and I was interested on the loads on the extrator worm screw that ''extract'' the silo's stuff. When the extractor is static the worm screw carry the silo's stuff weigth but when the worm srew is running...

Hello bearing lovers, I'd like to discuss another phenomena with all of you. I think we all know that running precision bearing too high in temperature is not good (over 50 C) but what about them too cold. For angular contact bearing, if your bearings run too cold, it could mean that...

Here another question (I know, I'm asking a lot of questions!). What would be the best spindle housing material. I know that cast iron and malleable cast iron are used a few. Cast iron is a little bit more thermically stable than malleable. Is it a good thing? Personnaly, I would say yes because...

Hello folks, I'm designing a new spindle and I'd like to have a great seal design. I got some information with skf but i'd like to have something more relevant. Does someone have an idea where I can find more information? Thanks for any help

Hi folks, I'm looking at a spectrum signal of a 3600 rpm spindle. one of the bearing defect frequencies is 2332 hz and 2915 hz according to NSK spec. I got a high peak (about 450mg) at 2337 hz and 2918 hz (about 520mg). Is there a tolerance on those readings? Can I condiser those...

I think I have a good question for all the people in bearing design applications. I have two different opinions from experience bearing guys. If I add a spacer between two angular contact bearings, both agreed on the fact that it will increase the system rigidity. But one says that it will lower...

I'd like to know what is the best way to size a motor in function of a tool inertia. My tool inertia is 72lbf-ft^2 and referring on motor's chart, a 75 hp would be required. I find that really big for a tool that just need to reach full speed and their will be no external applied to the tool...

I have a spindle running at 3600 rpm with a 550 lbs, 12'' diameter tool, mounted with a pair of 7020 15deg ang. cont. at each end. Two companies did bearing analysis for me. One (bearing manuf.)said there was too much preload, one (spindle repair company) said the opposite. It's a high impact...

Hello, Can someone suggest me a good FEA software compatible with inventor at low cost. All the FEA softwares seem to be really expensive. Thanks,

Hello everyone, I'm looking for a vibration analyser an a balancer to run some spindles up. I'd also like to use the vibration analyser for onsite troubleshooting. Can you tell me what would be the best price/performance device to buy? I know that there are some accelorometers...