Slip an slide.

[itsmoked]

I've been looking in McMaster-Carr for grease. Frankly I'm dazed and confused.

I have some two ton, internal screw, jacks that have steel acme-threads with steel nuts, and some bevel gears to turn the horizontal rotating shaft motion into vertical acme thread motion. They are square, telescoping, tube-type jacks.

I have used lithium spray greases and been horrified to find the result dry and ungrease like in about a year. I have gotten Teflon based lubes that seem to be gone in a few months. Other greases seem to separate and the liquid part runs away leaving dried peanut butter.

These jacks will be put in service and can never be internally greased ever again. Whereas the exterior sliding parts could be. The life of these jacks is going to be directly related to the long term functionality of the grease I use.

Temperature will be normal ambients. Cycles will be infrequent.

It would be nice to use something that works on the slides and the internals. Barring that they would need to coexist as they could mix.

What can you suggest?

Keith Cress
kcress -

http://www.flaminsystems.com

 

[romke]

a grease most likely will not work satisfactory - as you already experienced. what might work is a socalled antiseize compound - usually a mixture of a thickener and a working substance like MoS2, copper, graphite etc.

i suggest you talk to a reputable supplier of that kind of products about your application (Google antiseize compound). Standard petroleumbased products will not give the life you need.

 

[unclesyd]

I would contact LF and JSH with your problem. If you think that a thermoset coating is required for screw a check with Dow, Acheson, or Everlube would be the way to go.

http://www.lowerfriction.com/tungsten.php

http://www.jshindustries.com/jsh_fs.asp?data.asp

http://www.achesonindustries.com/ac...lish/markets/antifriction/dry+film+lubricants

http://www.everlubeproducts.com/products/1.0.php

 

[itsmoked]

Thanks gents for the leads.

Keith Cress
kcress -

http://www.flaminsystems.com

 

[sreid]

I'm a fan of DuPont Krytox greases. McMaster sells some varients.