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| "Sticky"/ viscous oil to slow down moving parts. |
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| S. Heslop:
--- Quote from: philf on February 17, 2013, 04:26:08 PM ---The stuff you need is Kilopoise grease. I use it on microscope focussing slides. Have a look at http://www.rocol.com/products/kilopoise-high-viscosity-damping-grease From the above page: KILOPOISE damping grease can be used for the lubrication of slides, gears and threads on instruments to impart smooth positive movement with a ‘silky’ feel by providing damping and increased friction/drag. •KILOPOISE greases do not harden due to their extremely low volatility, therefore, adjustments can be continually made •Damping action allows smooth precise movement •Allows larger clearances and tolerances on mating parts •Low volatility, therefore product remains unchanged over long periods •Seals against moisture Cheers. Phil. --- End quote --- That sounds like exactly it. DAMPING GREASE seems to be the keyword. The other thing I was worried about with using things like wax or more regular greases is that they'd probably lose alot of their viscosity as they warm up from moving the joint around. Do you get any 'tuneability' with it though? Like could I try source a small tube of a more and less viscous one, and play around with mixes to try and match the friction on the horizontal to the friction on the vertical? Heres another picture of it in bits, for anyone that might care. There's still a few things I need to add before it's complete. |
| S. Heslop:
Boy, with the price of even tiny tubes of damping grease I'm considering just scraping as much as I can out of the telescope's focussing slide. |
| redshift:
Just a thought, Could you use a small pneumatic cylinder sealed and filled with oil and regulate the damping by drilling a suitable sized hole in the piston. A small rose joint on each end to fix to suitable mounting points and Bob might be your uncle. Regards Dave |
| philf:
I'm not sure if it's available in different viscosities but you could get some tuning by either adjusting the clearance or the area of the bearing surfaces. There's a long list of stockists on the Rocal website but how many of these stock Kilopoise I don't know. RS sell 450gm tins at £74.70 + VAT! I have done a quick Google and can't find it in tubes. There may be equivalents. If you are anywhere near me you're welcome to try some. Cheers. Phil. |
| S. Heslop:
--- Quote from: philf on February 17, 2013, 05:32:05 PM ---I'm not sure if it's available in different viscosities but you could get some tuning by either adjusting the clearance or the area of the bearing surfaces. There's a long list of stockists on the Rocal website but how many of these stock Kilopoise I don't know. RS sell 450gm tins at £74.70 + VAT! I have done a quick Google and can't find it in tubes. There may be equivalents. If you are anywhere near me you're welcome to try some. Cheers. Phil. --- End quote --- I found one firm selling a box of 5 syringes of a different brand damping grease covering a whole range of viscosity, but for £80. Still not sure if you'd get away mixing them to try and reach a viscosity in the middle though. According to another thing I found Rocol discontinued the 50g tubes of the stuff over a year ago, which is tragic. I think i'd like to try and find my own tube though but thanks for the offer. It seems like it'd be useful stuff to have around. I found some stuff on a motorcycle forum about using it for throttle handles, so maybe i'll try asking in some of the bike shops next time i'm going through that part of town. |
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