Fiber change gears

This topic has 10 replies, 9 voices, and was last updated 17 July 2020 at 13:20 by Michael Gilligan.

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17 July 2020 at 10:39 #13981
Lee Reynolds 1
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@leereynolds1
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17 July 2020 at 10:39 #486197
Lee Reynolds 1
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@leereynolds1
Hi,

When I get it up and running I will have a change gear set on my Harrison M300 that will comprise a combination of metal, fiber and Delrin gears.

Do I lubricate the set, and if I do, what do you more experienced machinists suggest I use.

I seem to remember reading somewhere that nylon should not be lubricated, is Delrin the same?

Regards,

Lee
17 July 2020 at 10:56 #486210
Anonymous
My M300 has the original steel and Tufnol change gears. I give them an occasional squirt with ISO68 slideway oil as per the manual.

Andrew
17 July 2020 at 11:14 #486216
Ronald Morrison
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@ronaldmorrison29248
Delrin should not need lubrication buy shouldn't be harmed by lubrication either.
17 July 2020 at 11:41 #486227
Circlip
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@circlip
Nylon absorbs water and even the "Low" absobtion rated Nylon 6 or 6-6 does to a lesser extent. Tufnol should not be lubricated, it's a layered material.

Regards Ian.
17 July 2020 at 12:05 #486237
Swarf, Mostly!
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@swarfmostly
Posted by Circlip on 17/07/2020 11:41:31:

Nylon absorbs water and even the "Low" absobtion rated Nylon 6 or 6-6 does to a lesser extent. Tufnol should not be lubricated, it's a layered material.

Regards Ian.

Hi there, Ian,

Are you suggesting possible delamination?

Best regards,

Swarf, Mostly!
17 July 2020 at 12:05 #486238
not done it yet
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@notdoneityet
Posted by Andrew Johnston on 17/07/2020 10:56:08:

My M300 has the original steel and Tufnol change gears. I give them an occasional squirt with ISO68 slideway oil as per the manual.

Andrew

Exactly this. As per page 8 of the user manual. Or rather ‘daily’, perhaps?
17 July 2020 at 12:08 #486239
john halfpenny
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@johnhalfpenny52803
Henry Ford used layered tufnol for camshaft gears on millions of cars. Later he used macerated tufnol, and later still a type of nylon. No problems from engine oil.
17 July 2020 at 12:23 #486246
Nick Wheeler
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@nickwheeler
Posted by john halfpenny on 17/07/2020 12:08:15:

Henry Ford used layered tufnol for camshaft gears on millions of cars. Later he used macerated tufnol, and later still a type of nylon. No problems from engine oil.

Although the nylon teeth on V6 cam gears are a notorious week point…….
17 July 2020 at 13:09 #486254
Lee Reynolds 1
Participant
@leereynolds1
Sorry Gentlemen it,s the fiber gear I am more concerned about. It came from 600 group as it was an original gear but missing from my S/H machine.

For the price I expected a metal one….silly me! and then the lubrication advice in the manual would make sense and be followed.

Lee
17 July 2020 at 13:20 #486257
Michael Gilligan
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@michaelgilligan61133
Posted by Circlip on 17/07/2020 11:41:31:

[…]

Tufnol should not be lubricated, it's a layered material.

.

Certain grades of Tufnol are used for propeller shaft bearings … totally immersed in, and lubricated by, water.

MichaelG.

.

A little light reading: http://ahistoryoftufnol.org/whatistufnol/

and … https://www.tufnol.com/technical/technical_materials.aspx

Edited By Michael Gilligan on 17/07/2020 13:30:35
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